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    • 专利摘要:
    CONVERSING STATION IN CASCADE AND HVDC MULTITERMINAL POWER TRANSMISSION SYSTEM IN CASCADE. The present invention relates to a cascade converter station and a multiterminal cascade high voltage cascade power transmission system (HVDC). The converter station includes a low voltage terminal converter station (11) and a high voltage terminal converter station (12). Each electrode of the low voltage terminal converter station (11) includes a converter transformer (111a, and 111b) coupled to a first grid of alternating current (AC) energy, a converter valve (112a, 112b) coupled to the converter transformer (111a , 111b) and smoothing reactors (115a, 115b). The high voltage terminal converter station (12) connected in series with the low voltage terminal converter station (11) through a medium voltage direct current (DC) power transmission line (13) and connected to a power line. HVDC power transmission (14). Each electrode of the high voltage terminal converter station (12) includes a converter transformer (121a, 121b) coupled to a second AC power grid, a converter valve (122a, 122b) coupled to the converter conveyor (121a, 121b) and reactors of smoothing (125a, 125b). An earth electrode line (126) and a return line of (...).
    公开号:BR112013014380B1
    申请号:R112013014380-0
    申请日:2010-12-09
    公开日:2020-10-20
    发明作者:Xin Sun
    申请人:State Grid Corporation Of China；
    IPC主号:
    专利说明:

    Technical Field
    [0001] The present invention relates to the field of DC power transmission. Specifically, this invention relates to a cascading converter station used in cascading multiterminal HVDC energy transmission and a cascading multiterminal HVDC energy transmission system constructed by cascading converter stations. Background
    [0002] With the development of power and electricity techniques, especially the development of the manufacture of high power controlled silicon rectifier (SCR); DC power transmission has gained increasingly broad applications in electrical power systems. A cascading multiterminal HVDC energy transmission system is composed of three or one of the above converter stations and a DC transmission line, in which more than one converter station operates as a rectifier station or an inverter station. Compared with a two-terminal HVDC power transmission system, in the following situations, for example, a cascade multiterminal HVDC power transmission system can operate in a more economical and flexible way: collecting electricity from multiple electric power bases ( wind farms) located in a large area for external transmission; transmitting a large amount of electricity from a power base to several remote charging centers; providing access to supply power or loads on medium branches of a DC line; performing asynchronous network of several AC systems through a DC line; for the transmission of energy from metropolis areas or industrial centers, transmitting electrical energy to several converter stations through the transmission of energy, where cables need to be used due to the limits in the high voltage line corridors, or the transmission of AC power is inadequate due to limits on short-circuit capacity.
    [0003] In a cascading multiterminal HVDC power transmission system, it is inevitable for high voltage devices, such as converters, smoothing reactors, DC filters, etc. that suffer from the impact of high voltage, high current, the natural environment and connected AC systems that fail. In the case of a defective part of the system (such as a converter at a certain stage), it is desirable to cut such part of the system with confidence while keeping other parts of the system operating normally, in order to ensure the safety of the HVDC power transmission system and improve your energy availability. summary
    [0004] The invention is aimed at overcoming the above problem, and providing a technique for carrying out HVDC energy transmission in a flexible, reliable and economical way.
    [0005] To achieve the above objective, in accordance with a first aspect of this invention, a cascading converter station used in cascading multiterminal HVDC power transmission is provided comprising: a low voltage terminal converter station that has a positive side and a positive side. negative, each comprising a converter transformer coupled to a first alternating current (AC) network; a converter valve coupled to the converter transformer to perform DC / AC conversion; and smoothing reactors provided at both ends of the converter valve; and a high voltage terminal converter station, which is connected in series to the low voltage terminal converter station via a medium voltage DC power transmission line, and is connected to a high voltage power transmission line, where the high voltage terminal energy converter station comprises a positive and a negative side, each comprising a converter transformer coupled to a second alternating current (AC) network; a converter valve coupled to the converter transformer to perform DC / AC conversion; and smoothing reactors provided at both ends of the converter valve; where a grounding line coupled to a grounding electrode and a metal return line coupled between a positive line and a negative line are provided at the low voltage terminal converter station.
    [0006] In accordance with a second aspect of this invention, a cascading converter station used in a cascading multiterminal HVDC power transmission is provided, comprising: a low voltage terminal converter station comprising a positive side and a negative side, each which comprising a converter transformer coupled to a first alternating current (AC) network; a converter valve coupled to the converter transformer to perform DC / AC conversion; and smoothing reactors provided at both ends of the converter valve; and a high voltage terminal converter station, which is connected in series to the low voltage terminal converter station via a DC power transmission line, and is connected to a high voltage DC power transmission line, in which the station high voltage terminal converter comprises a positive and a negative side, each comprising a converter transformer coupled to a second alternating current (AC) network; a converter valve coupled to the converter transformer to perform DC / AC conversion; and smoothing reactors provided at both ends of the converter valve; wherein a grounding line coupled to a grounding electrode and a metal return line coupled between a positive line and a negative line are provided at the low voltage terminal converter station, and a grounding line attached to the grounding electrode is provided at the high voltage terminal converter station.
    [0007] In accordance with a third aspect of this invention, a cascading converter station used in cascading multiterminal HVDC power transmission is provided, comprising: a high voltage terminal converter station comprising a positive side and a negative side, each comprising a converter transformer coupled to the first alternating current (AC) network; a converter valve coupled to the converter transformer to perform DC / AC conversion; and smoothing reactors provided at both ends of the converter valve; and a high voltage terminal converter station, which is connected in series to the low voltage terminal converter station via a DC power transmission line, and is connected to a high voltage DC power transmission line, in which the station high voltage terminal converter comprises a positive side and a negative side, each comprising a converter transformer coupled to a second alternating current (AC) network; a converter valve coupled to the converter transformer to perform DC / AC conversion; and smoothing reactors provided at the two terminals of the converter valve; wherein a grounding line coupled to the grounding electrode and a metal return line coupled between a positive line and a negative line are provided at the low voltage terminal converter station; a grounding line coupled to the grounding electrode and a neutral bus are provided at the high voltage terminal converter station.
    [0008] In accordance with a fourth aspect of this invention, a cascading converter station used in cascading multiterminal HVDC power transmission is provided, comprising: a low voltage terminal converter station comprising a positive side and a negative side, each comprising a converter transformer coupled to the first alternating current (AC) network; a converter valve coupled to the converter transformer to perform DC / AC conversion; and smoothing reactors provided at the two converting valve terminals; and a high voltage terminal converter station, which is connected in series to the low voltage terminal converter station via a medium voltage DC power transmission line, and is connected to the high voltage power transmission line (DC), wherein the high voltage terminal converter station comprises a positive and a negative side, each comprising a converter transformer coupled to a second alternating current (AC) network; a converter valve coupled to the converter transformer to perform DC / AC conversion; and smoothing reactors provided at the two converting valve terminals; wherein a grounding line coupled to the grounding electrode and a metal return line coupled between a positive line and a negative line are provided at the low voltage terminal converter station; a grounding line coupled to the grounding electrode, a neutral bus switch, and a neutral bus isolating knife switch are provided at the high voltage terminal converter station, and a path to bypass the high voltage terminal cascade converter station. is coupled between the medium voltage DC power transmission line and the high voltage DC power transmission line.
    [0009] In accordance with a fifth aspect of this invention, a cascading multiterminal HVDC energy transmission system is provided, comprising: a side side converter station, a side receiving side converter station, and a high power DC transmission line tension between them, in which at least one of the sending side converter station and the receiving side converter station is built according to the cascading converter station of the first four aspects above.
    [00010] With the cascading converter station of this invention and the cascading multiterminal HVDC energy transmission system formed by such cascading converter stations, due to various flexible combinations of a grounding line, a metal return line is provided, a neutral bus device and an isolating knife switch in the electrical wiring of the cascading converter station, other parts of the system can continue operation if a failure occurs in a certain part of the system, so that the safety of the HVDC power transmission system and their energy availability can be improved, as the smoothing reactors are provided on both sides of the converter valve, the effect of the lighting protection can be effectively achieved. Brief Description of the Various Views of the Drawings
    [00011] To understand the above aspects and advantages of this invention more clearly, the preferred embodiments of this invention are illustrated in the attached drawings in an unrestricted manner, in which the same or similar identifications indicate the same or similar components.
    [00012] Figure 1 is a schematic view of the structure and electrical wiring of a cascading converter station used in cascading multiterminal HVDC energy transmission according to a first embodiment of this invention;
    [00013] Figure 2 illustrates the electrical wiring of the cascading converter station in its normal operating state for the first modality of this invention;
    [00014] Figures 3A to 3C illustrate the bipolar 3/4 electrical wiring of the cascading converter station of the first embodiment of this invention;
    [00015] Figures 4A to 4B illustrate the bipolar 1/4 electrical wiring of the cascading converter station of the first embodiment of this invention;
    [00016] Figure 5 illustrates a total monopole ground return electrical wiring from the cascading converter station of the first embodiment of this invention;
    [00017] Figures 6A to 6B illustrate the electrical wiring of 1/4 monopole grounding of the cascading converter station of the first modality of this invention;
    [00018] Figure 7 illustrates a total monopole metal return electrical wiring from the cascading converter station of the first embodiment of this invention;
    [00019] Figures 8A and 8B illustrate the 1/2 electrical return wire monopole metal of the cascading converter station of the first embodiment of this invention;
    [00020] Figure 9 is a schematic diagram of the structure and electrical wiring of a cascading converter station used in cascading multiterminal HVDC energy transmission according to a second embodiment of this invention;
    [00021] Figure 10 illustrates the total bipolar electrical wiring of the cascading converter station in its normal operating state according to a second embodiment of this invention;
    [00022] Figures 11A to 11C illustrate the bipolar 3/4 electrical wiring of the cascading converter station of the second embodiment of this invention;
    [00023] Figures 12A to 12B illustrate the 1/2 bipolar electrical wiring of the cascading converter station of the second embodiment of this invention;
    [00024] Figure 13 illustrates the total monopole ground return electrical wiring of the cascading converter station of the second embodiment of this invention;
    [00025] Figures 14A to 14C illustrate the electrical wiring of 1/2 monopole ground return of the cascading converter station of the second embodiment of this invention;
    [00026] Figure 15 illustrates the monopole metal return electrical wiring of the cascading converter station of the second embodiment of this invention;
    [00027] Figures 16A to 16C illustrate the 1/2 wire monopole metal return electrical wiring of the cascading converter station of the second embodiment of this invention;
    [00028] Figure 17 illustrates a first expanded electrical wiring scheme for the cascading converter station of the second embodiment of this invention;
    [00029] Figure 18 illustrates the monopole metal return electrical wiring from the high voltage terminal converter station in the first expanded electrical wiring scheme of the second embodiment of this invention;
    [00030] Figure 19 illustrates a second expanded electrical wiring scheme for the cascading converter station of the second embodiment of this invention;
    [00031] Figure 20 illustrates the monopole metal return electrical wiring from the low voltage terminal converter station in the second expanded electrical wiring scheme of the second embodiment of this invention;
    [00032] Figure 21 is a schematic diagram of the structure and electrical wiring of a cascading converter station used in cascading multiterminal HVDC power transmission according to a third embodiment of this invention;
    [00033] Figure 22 illustrates the bipolar 3/4 electrical wiring of the cascading converter station of the third modality of this invention;
    [00034] Figure 23 illustrates the bipolar electrical wiring of the high voltage terminal converter station in the cascade converter station of the third embodiment of this invention;
    [00035] Figure 24 illustrates an expanded electrical wiring scheme of the cascading converter station of the third embodiment of this invention;
    [00036] Figure 25 is a schematic diagram of the structure and electrical wiring of a cascading converter station used in cascading multiterminal HVDC energy transmission according to a fourth embodiment of this invention;
    [00037] Figure 26 illustrates the total bipolar electrical wiring of the cascading converter station in its normal operating state according to the fourth modality of this invention;
    [00038] Figures 27A to 27B illustrate the 3/4 bipolar electrical wiring of the cascading converter station of the fourth embodiment of this invention;
    [00039] Figures 28A to 28B illustrate the% bipolar electrical wiring of the cascading converter station of the fourth embodiment of this invention;
    [00040] Figure 29 illustrates the monopole ground return electrical wiring of the cascading converter station of the fourth modality of this invention;
    [00041] Figure 30A and Figure 30B illustrate the monopole ground return electrical wiring 1/2 of the cascading converter station of the fourth embodiment of this invention;
    [00042] Figure 31 illustrates the total monopole metal return electrical wiring of the cascading converter station of the fourth embodiment of this invention;
    [00043] Figure 32A and Figure 32B illustrate the monopole metal return 1/2 electrical wiring of the cascading converter station of the fourth embodiment of this invention;
    [00044] Figure 33 illustrates a first expanded electrical wiring scheme for the cascading converter station of the fourth embodiment of this invention;
    [00045] Figure 34 illustrates a second expanded wiring diagram of the cascading converter station of the fourth embodiment of this invention;
    [00046] Figure 35 illustrates an optional CC filter configuration;
    [00047] Figure 36 illustrates another optional CC filter configuration;
    [00048] Figure 37 illustrates yet another optional CC filter configuration;
    [00049] Figure 38 illustrates a cascade multiterminal HVDC power transmission system according to this invention. Detailed Description
    [00050] A detailed description of this invention will be provided below with reference to the drawings, which are merely illustrative, but do not limit the scope of this invention.
    [00051] Figure 1 is a schematic view of the structure and electrical wiring of a cascading converter station used in cascading multiterminal HVDC energy transmission according to a first embodiment of this invention. To simplify this description, Figure 1 illustrates the sending side of the HVDC power transmission system, that is, a schematic diagram of the rectifying side. However, those skilled in the art may understand that the receiving side of the HVDC power transmission system, that is, the inverter side may have substantially the same structure and electrical wiring as the sending side, but a converter station on the inverter side in a condition reversing operation, and there is a slight difference between the filter configuration and the grinding side.
    [00052] As illustrated in Figure 1, the cascading converter station according to the first embodiment comprises a low voltage terminal converter station 11 and a high voltage terminal converter station 12, which can be located in different geographical positions. The high voltage terminal converter station 12 is connected to the low voltage terminal converter station 11 in series via the medium voltage DC power transmission line 13. The high voltage terminal converter station 12 is also connected to a high voltage transmission line. DC power 14.
    [00053] The low voltage terminal converter station 11 is used to convert an alternating current generated by the first alternating current power supply 110 into a direct current, and insert it into the high voltage terminal converter station 12 through the power transmission line. Medium voltage dc 13. The high voltage terminal converter station 12 converts an alternating current generated by a second alternating current power supply 120 into a direct current, and overlays it with the direct current emitted from the low voltage terminal converter station 11 to generate a direct current, which is then transmitted to the receiving side, that is, the inverter side (not shown in Figure 1) of the HVDC power transmission system through the high voltage DC power transmission line 14. The first ac power supply 110 and the second ac power supply 120 can be wind farms located at l different locations. So that the electrical energy collected from the various power supplies can be sent in the DC way.
    [00054] The voltage of the high voltage direct current emitted from the high voltage terminal converter station 12 can vary above ± 750KV, for example, the voltage of the high voltage direct current can be ± 800KV or ± 1000KV. The present description will be provided here with high voltage direct current of ± 800KV as an example. In that case, the voltage variation of the direct current emitted from the low voltage terminal converter station 11 is preferably half of the high voltage direct current, i.e., ± 400KV. The current voltage of the second AC power supply 120 rectified by the high voltage terminal converter station 12 is also ± 400KV, so that the voltage of the high voltage direct current obtained by overlapping the two alternating currents is ± 800KV.
    [00055] The negative side of the low voltage terminal converter station 11 comprises a converter transformer 111a coupled to the first AC power supply 110. The converter transformer 111a is used to change the AC voltage and performs electrical insulation between the AC part and the part DC in the power transmission system.
    [00056] A converter valve 112a is coupled to converter transformer 111a, which is used to perform AC / DC conversion. In the embodiment of this invention, the converter valve 112a is preferably a 12-pulse converter valve.
    [00057] On each side of converter valve 112a, a smoothing reactor 115a is provided. Smoothing reactors 115a are used to smooth out DC ripples and prevent DC interruption. The smoothing reactor 115a can also prevent impulse waves accentuated by DC lines or DC devices from entering the valve room, and thereby prevent overcurrent damage to converter valve 112a. Through the arrangement of the smoothing reactors 115a on both sides of the converter valve 112a, the effect of the lighting protection can be effectively achieved, so that the energy transmission system can be improved.
    [00058] In the scheme illustrated in Figure 1, a CC filter 117a is also connected through two terminals of the smoothing reactors 115a, to filter harmonic current generated in the conversion valve conversion process, in order to prevent interference in the system caused by the current harmonica. According to another optional scheme, the isolation knife switches can be supplied on both sides of the CC filter 117a.
    [00059] A bypass isolation knife switch 116a is disposed between the smoothing reactors 115a, to provide a bypass when a failure in converter valve 112a occurs. An AC bypass switch 113a and isolation knife switches 114a are also provided near converter valve 112a.
    [00060] The positive side of the low voltage terminal converter station 11 has a symmetrical structure for the negative side structure, and comprises a converter transformer 111b, a converter valve 112b, smoothing reactors 115b, a CC filter 117a, a isolation knife bypass 116b, an AC bypass switch 113b and isolation knife byways 114a, which will not be described here in detail because they have the same functions as the components on the negative side.
    [00061] The high voltage terminal converter station 12 has a bipolar structure similar to the low voltage terminal converter station 11. In particular, the high voltage terminal converter station 12 comprises: converter transformers 121a, 121b coupled to a second AC power supply 120 , converter valves 122a, 122b coupled to converter transformers 121a, 121b, smoothing reactors 125a and smoothing reactors 125b arranged on both sides of converter valves 122a, 122b, respectively; the CC filters 127a, 127b through both terminals of the smoothing reactors 125a and the smoothing reactors 125b, respectively; isolation knife bypass switches 126a, 126b provided between smoothing reactors 125a and smoothing reactors 125b, respectively, bypass switches 123a, 123b and isolation knife switches 124a, 124b; which will not be described in detail here because they have the same functions as the components of the low voltage terminal converter station 11.
    [00062] Incidentally, in the first modality illustrated in Figure 1, there are DC filters connected through both sides of the smoothing reactors in the low voltage terminal converter station 11 and the high voltage terminal converter station 12, respectively, and can be eliminated harmonic current throughout the system with such a configuration. However, it should be noted that when selecting an electrical wiring scheme for cascading multiterminal HVDC power transmission system, a reasonably DC filter configuration can be selected, depending on the equivalent interference current requirements of a project. If it is required to meet a standard on equivalent interference current across the entire line, the configuration of supplying a DC filter through both sides of the smoothing reactors is adopted; on the other hand, if the main current of precarious equivalent interference across the line is allowed to be non-standard, the DC filters can be canceled. Below, the configuration of the CC filters will be described in more detail below.
    [00063] At the cascading converter station according to the first modality, a grounding line 126 is provided coupled to a grounding electrode and a metal return line 128 that is coupled between the positive line and the negative line at the converter station low voltage terminal 11. The grounding electrode can be supplied at a distance of 40 to 50 km from the converter station of low voltage terminal 11. In addition, neutral bus switches (NBS) 119a, 119b, a circuit breaker are provided neutral bus ground (NBGS) 121, a neutral bus ground switch (NBGS) 121, a ground return transfer switch (GRTS) 120, and a metal return transfer switch (MRTS) 125 on electrical wiring of the low voltage terminal converter station 11. The NBS 119a, 119b are used to quickly isolate a pole that is blocked to exit and a normal pole. The NBGS 121 is used to switch the neutral bus to a temporal grounding grid of the low voltage terminal converter station 11 when the grounding electrode exits in a bipolar mode. The MRTS 125 and GRTS 120 cooperate with each other to switch between the monopole ground return and a monopole metal return.
    [00064] The high voltage terminal converter station 12 does not have a grounding line coupled to the grounding electrode and a metal return line adjusted thereon.
    [00065] Figure 2 to Figure 8 illustrate seven ways of operating electrical wiring of the above cascading converter station according to the first embodiment of this invention, respectively. (1) electrical wiring for complete bipolar operation; (2) bipolar operation 3/4 electrical wiring (3) bipolar operation 1/2 electrical wiring (4) total monopole ground return electrical wiring (5) 1/2 monopole complete ground return electrical wiring ( 6) full monopole metal return electrical wiring (7) 1/2 monopole metal return electrical wiring
    [00066] In these seven electrical wiring modes of operation, full bipolar electrical wiring is the way of electrical wiring in a normal operating condition, and the others are those in fault conditions.
    [00067] Referring to Figure 2, in which the electrical wiring for total bipolar operation in the normal operating condition is illustrated. The charged parts of the cascading converter station are illustrated by thick lines. Four converter valves 112a, 112b, 122a, 122b at the positive and negative poles of the low voltage terminal converter station 11 and the high voltage terminal converter station 12 are all put into operation.
    [00068] Figure 3A to Figure 3C illustrate the electrical wiring of 3/4 of bipolar operation. This way of operation means that, among the four converter valves 112a, 112b, 122a, 122b at the positive and negative poles of the low voltage terminal converter station 11 and of the high voltage terminal converter station 12, a defective converter valve leaves the operation , while another three converter valves 122a, 122b continue to operate.
    [00069] Figure 3A and Figure 3B illustrate a schematic diagram of the operating electrical wiring when the converter valve 112a of the low voltage terminal goes out of operation. As illustrated in Figure 3A and Figure 3B, there are two bypass paths for converter valve 112a out of service: a GRTS and a metal return circuit, or a circuit with bypass isolation knife switches. When a smoothing reactor 115a or DC filter 117a failure occurs on a low voltage terminal converter valve 112a, it can be bypassed using GRTS 120 and metal return line 128. In this case, converter valves 122a, 122b on the high voltage terminal are still in operation. Since DC circuit breakers are provided for these two feedback circuits, switching can be carried out in line.
    [00070] Figure 3C illustrates a schematic diagram of the operating electrical wiring when the converter valve 122a at the high voltage terminal goes out of operation. As illustrated in Figure 3C, when converter valve 122a at the high voltage terminal goes out of operation, smoothing reactors 125a on both sides of the converter valve are still connected in the operating circuit and will not come out.
    [00071] Figure 4A and Figure 4B illustrate 1/2 electrical wiring for bipolar operation. This way of operation means that a converter station of the low voltage terminal converter station 11 and of the high voltage terminal converter station 12 goes out of operation due to the failure, while the positive and negative poles of the other converter station still remain in operation.
    [00072] Figure 4A illustrates a schematic diagram of operating electrical wiring when converter valves 122a, 122b at the high voltage terminal exit operation. As illustrated in Figure 4A, when converter valves 122a, 122b at the high voltage terminal exit operation, smoothing reactors 125a and 125b on both sides of converter valves 122a, 122b are still connected in the operation circuit and do not come out.
    [00073] Figure 4B illustrates a schematic diagram of the operating electrical wiring when the converting valves 122a, 122b at the low voltage terminal exit the operation. As illustrated in Figure 4B, when converter valve 112b at the SAE low voltage terminal of the operation, the smoothing reactors 115b on both sides of the converter valve are still connected in the operation circuit and do not come out.
    [00074] Figure 5 illustrates the total monopole ground return electrical wiring. This way of operation means that between the positive and negative poles of the low voltage terminal converter station 11 and the high voltage terminal converter station 12, the converter valves 122a, 122b of one pole go out of operation due to a failure, although the valves converters 122a, 122b on the other pole (including the high voltage terminal and the low voltage terminal) are still in operation, and a return circuit is formed through the ground. Figure 5 illustrates a condition in which converter valve 112b at the low voltage terminal and converter valve 122b at the high voltage terminal of the positive pole go out of operation, although converter valve 112a at the low voltage terminal and converter valve 122a at high voltage terminal of the negative pole remain in operation.
    [00075] Figure 6A and Figure 6B illustrate the 1/2 monopole ground return electrical wiring. This way of operation means that between the low voltage converter station 11 and the high voltage terminal converter station 12, the converter valves of a converter station (including the positive and negative poles) go out of operation due to a failure, while the valve one pole converter at the other converter station remains in operation, and a return circuit is formed across the earth.
    [00076] Figure 6A illustrates a schematic diagram of the operating electrical wiring when the converter valves 122a, 122b of the high voltage terminal converter station 12 go out of operation, although the negative valve converter valve 112a in the low voltage terminal converter station 11 stay in operation. As shown in Figure 6A, when converter valves 122a of the high voltage terminal go out of operation, smoothing reactors 125a on both sides of the converter valve are still connected in the operating circuit and will not come out.
    [00077] Figure 6B illustrates a schematic diagram of operating electrical wiring when converter valves 112a, 112b of the low voltage terminal converter station 11 leave the operation, although only the negative pole converter valve 122a in the high voltage terminal converter station 12 remains in operation.
    [00078] Figure 7 illustrates the total monopole metal return electrical wiring. This way of operation means that the positive and negative poles of the low voltage terminal converter station 11 and the high voltage terminal converter station 12, the one pole converter valves go out of operation due to a failure, although the converter valves on the other pole (including the high voltage terminal and the low voltage terminal) still remain in operation, and a return circuit is formed through a metal line. Figure 7 illustrates a condition in which converter valve 112b at the low voltage terminal and converter valve 122b at the high voltage terminal of the positive pole exit operation, while converter valve 112a at the low voltage terminal and converter valve 122a at high voltage terminal of the negative pole remain in operation.
    [00079] Figure 8A and Figure 8B illustrate the monopole metal 1/2 return electrical wiring. This way of operation means that between the low voltage terminal converter station 11 and the high voltage terminal converter station 12, the converter valves of a converter station (including the positive and negative poles) go out of operation due to a failure, while the valve Pole converter at the other converter station remains in operation, and a return circuit is formed through a metal line.
    [00080] Figure 8 illustrates a schematic diagram of the operating electrical wiring when the converter valves 122a, 122b of the high voltage terminal converter station 12 go out of operation, while the converter valves 112a of the negative pole in the low voltage terminal converter station 11 remains in operation. As shown in Figure 8A, when the high voltage terminal converter station 122a and 122b leave the operation, the smoothing reactors 125a and 125b on both sides of the converter valves are still connected in the operating circuit and do not exit.
    [00081] Figure 8B illustrates a schematic diagram of the operating electrical wiring when the converting valves 112a, 112b of the low voltage terminal converter station 11 go out of operation, while the converter valve 122a of the negative pole in the high voltage terminal converter station 12 remains in operation. As shown in Figure 8B, when the high voltage end converter valve 122b and the low voltage end converter valve 112A leave the operation, the smoothing reactors 125b and 115a on both sides of the converter valves are still connected in the operation circuit and don't come out.
    [00082] The advantages of the cascading converter station electrical wiring schemes according to the first embodiment of this invention as described with reference to Figure 1 and Figure 8 are: when a converter valve in the low voltage terminal converter station 11 stops function, in-line bypass is achieved using a metal return line or an isolating knife bypass switch, to provide control flexibility. The circuit has fewer elements, and therefore greater reliability. In addition, compared to the HVDC Xiang jiaba - Shang hai energy transmission system in the state of the art, as the metal return line 128 is provided at the low voltage terminal converter station 11, the same function is performed with the lower insulation level that is required for devices.
    [00083] In electrical wiring schemes of the cascading converter station according to the first modality of this invention, if a single pole medium voltage DC line fault occurs, or single pole neutral bus devices in the converter station. low voltage (NBS, isolation knife switch, CT, PT and other devices) only single-pole ground return operation is possible. If a failure occurs in the medium voltage lines of the two poles, the two poles must stop the operation. To improve the availability of energy, according to a second embodiment of this invention, another cascading converter station is provided.
    [00084] Figure 9 is a schematic diagram of the structure and electrical wiring of a cascading converter station used in cascading multiterminal HVDC energy transmission according to a second embodiment of this invention.
    [00085] Compared to the first modality in the cascade converter station according to the second modality, a grounding line 133 coupled to a grounding electrode is installed in the high voltage terminal converter station 12. In addition, the knife switches are added neutral bus isolation 137a and 137b.
    [00086] As in the first embodiment, Figures 10 to 16 illustrate seven ways of operating electrical wiring of the cascading converter station according to the third embodiment of this invention, respectively: (1) electrical wiring of complete bipolar operation; (2) bipolar operation 3/4 electrical wiring (3) bipolar operation 1/2 electrical wiring (4) monopole total return electrical wiring (5) monopole electrical return 1/2 electrical wiring ( 6) full monopole metal return electrical wiring (7) 1/2 monopole metal return electrical wiring
    [00087] Referring to figure 10, which illustrates the electrical wiring for complete bipolar operation in a normal operating condition. Four converter valves 112a, 112b, 122a, 122b at the positive and negative poles of the low voltage terminal converter station 11 and the high voltage terminal converter station 12 are put into operation.
    [00088] Figures 11A to 11C illustrate the electrical wiring of 3/4 of bipolar operation.
    [00089] Figure 11A illustrates a schematic diagram of the operating electrical wiring when the high voltage terminal converter valve 122a goes out of operation. As shown in Figure 11A, when the high voltage converter valve 122a goes out of operation, the smoothing reactors 125a on both sides of the converter valve are still connected in the operating circuit and will not come out.
    [00090] Figure 11B and Figure 11C illustrate a schematic diagram of the operating electrical wiring when the low voltage terminal converter valve 112a goes out of operation. As shown in Figures 11B and 11C, there are two bypass paths for converter valve 112a out of service: a GRTS and a metal return circuit, or a circuit with isolating knife bypass switches. When a smoothing reactor 115a or DC filter 117a of the low voltage terminal converter 112a fails, it can be bypassed using the GRTS 120 and the metal return circuit 128.
    [00091] Figure 12A and Figure 12B illustrate 1/2 electrical wiring for bipolar operation.
    [00092] Figure 12A illustrates a schematic diagram of the operating electrical wiring when the high voltage terminal converter valves 122a and 122b exit the operation. As shown in Figure 12A, when the high voltage terminal converter valves 122a and 122b exit operation, the smoothing reactors 125a and 125b on both sides of the converter valves are still connected in the operating circuit and do not exit.
    [00093] Figure 12B illustrates a schematic diagram of the operating electrical wiring when the low voltage terminal converter valves 112a and 112b exit the operation. As shown in Figure 12B, when the low voltage terminal converter valves 112a and 112b exit operation, the smoothing reactors 115a and 115b on both sides of the converter valves are still connected in the operating circuit and do not exit.
    [00094] Figure 13 illustrates the total monopole ground return electrical wiring, in which the low voltage end converter valve 112b and the high voltage end converter valve 122b of the positive pole exit the operation, while the low end converter valve voltage 112a and the high voltage terminal converter valve 122a of the negative pole remain in operation.
    [00095] Figure 14A to Figure 14C illustrate the single-pole grounding 1/2 return electrical wiring.
    [00096] Figure 14A illustrates a schematic diagram of the operating electrical wiring when converter valves 122a, 122b of the high voltage terminal converter station 12 go out of operation, while only the negative pole converter valve 112a in the low voltage terminal converter station. 11 remain in operation. As illustrated in Figure 14A, when the high voltage terminal converter station 122a goes out of operation, the smoothing reactors 125a on both sides of the converter valve are still connected in the operating circuit and will not come out.
    [00097] Figure 14B and 14C illustrate a schematic diagram of the operating electrical wiring when the converter valves 122a, 122b of the low voltage terminal converter station 11 go out of operation, while the converter valve 122a of the negative pole in the high terminal converter station voltage 12 remains in operation.
    [00098] Figure 15 illustrates a total monopole metal return electrical wiring, in which the low voltage terminal converter valve 112b and the high voltage terminal converter valve 122b of the positive pole, while the low voltage terminal converter valve 112a and the high voltage terminal converter valve 122a of the negative pole remains in operation.
    [00099] Figure 16A to Figure 16C illustrate the 1/2 return monopole metal electrical wiring.
    [000100] Figure 16A illustrates a schematic diagram of operating electrical wiring when converter valves 122a, 122b of the high voltage terminal converter station 12 go out of operation, while the negative pole converter valve 112a in the low voltage terminal converter station 11 remains on the operation. As illustrated in Figure 16A, when the high voltage terminal converter station 122a and 122b leaves the operation, the smoothing reactors 125a and 125b on both sides of the converter valves are still connected in the operating circuit and do not come out.
    [000101] Figure 16B and Figure 16C illustrate a schematic diagram of operating electrical wiring when converter valves 122a, 122b of the low voltage terminal converter station 11 leave the operation, while only the converter valve 122a of the negative pole at the terminal converter station high voltage 12 remains in operation. As illustrated in Figure 16B and Figure 16C, when the high voltage terminal converter valve 122b goes out of operation, the smoothing reactors 125b on both sides of the converter valve are still connected in the operating circuit and will not come out.
    [000102] The energy availability of the cascading converter station according to the second modality is higher than that of the first modality. When a failure occurs in the medium voltage lines of the two poles or low voltage terminal converter station in the neutral bus devices (NBS, NBGS, isolation knife switch, and other devices) of the two poles, the low voltage terminal converter station 11 exits the operation, and the high voltage terminal converter station 12 operates by means of a single pole metal return line or a single pole ground return line.
    [000103] Based on the electrical wiring schemes of the cascading converter station of the second modality, other schemes can be obtained through expansion according to particular project requirements.
    [000104] Figure 17 illustrates a first expanded electrical wiring scheme based on the second mode, in which a metal return line 138 is added to the high voltage terminal converter station 12. When the high voltage terminal converter station 12 is in the monopole metal return operation, the smoothing reactors 125b and the CC filter 127b from the other pole at the station can be bypassed, as shown in Figure 18.
    [000105] Figure 19 illustrates a second expanded electrical wiring scheme based on the second modality in which the bypass paths from converter station 139a and 139b are added to the high voltage terminal converter station 12. The low voltage terminal converter station 11 can operate even if there is a failure in the smoothing reactors or in the filter of the high voltage terminal converter station 12, as shown in Figure 20, in which the monopole grounding wiring of the low voltage terminal converter station 11 is illustrated.
    [000106] In the first mode, in the double pole or single-pole ground return state, if a smoothing reactor fails, the DC filter, or the single pole bypass isolation knife switch of the low voltage terminal converter station 11, can be deflected using the metal return line and the GRTS; however, if a single pole failure occurs at medium voltage the 400KV DC power transmission line or single pole neutral bus devices such as NBS, CT, PT and the single pole isolation knife switch (N-1 fault), that pole that must be stopped, and the double pole DC operation cannot be performed. In order to also improve energy availability, according to a third embodiment of this invention, another cascading converter station is provided.
    [000107] Figure 21 is a schematic diagram of the structure and electrical wiring of a cascading converter station used in cascading multiterminal HVDC power transmission according to a third embodiment of this invention.
    [000108] Compared to the second mode based on the addition of a neutral bus isolation knife switch, two NBS circuit breakers 140a, 140b and two neutral bus isolation knife switches 141a, 141b are also added.
    [000109] With the electrical wiring of the third modality, when an N-1 fault occurs, that is, a single pole failure of the 400KV medium voltage DC power transmission line or a failure in the neutral bus devices such as NBS, CT, PT and the single pole isolation knife switch, the cascading converter station can operate in a 3/4 double pole state, as shown in Figure 22.
    [000110] When an N-2 fault occurs, that is, when there is a failure in the medium voltage lines of the two poles or the low voltage terminal converter station 11 is in shutdown service, the high voltage terminal converter station 12 can operate in the double pole, in the monopole metal return, or in the monopole ground return state, to improve the energy availability of the system. As NBS 140A, 140b are provided on the neutral bus line of the high voltage terminal converter station 12 when the low voltage terminal converter station 11 is under maintenance and the high voltage terminal converter station 12 operates in the dual pole state, it is not it is necessary to stop the double pole operation if a single pole failure occurs, as shown in Figure 23, in which the double pole operation electrical wiring of the high voltage terminal converter station 12 is illustrated.
    [000111] Based on the electrical wiring scheme of the third modality, the high voltage terminal converter station 12 is required to switch in line between the single pole ground return and the single pole metal return line, to operate without pass through the separate metal return line from the other converter station and operate in the bipolar state using a converter station temporal ground, the expanded electrical wiring scheme shown in figure 24 can be adopted, in which a metal return line 138 and MRTB 143, GRTS 142, NGBS 144 are added to the high voltage terminal converter station 12.
    [000112] Figure 25 is a schematic diagram of the structure and electrical wiring of a cascading converter station used in cascading multiterminal HVDC energy transmission according to a fourth embodiment of this invention.
    [000113] Compared to the third modality, in the cascading converter station of the fourth modality, bypass paths 139a, 139b to bypass the high voltage terminal converter station 12 are coupled between the medium voltage DC power transmission line 13 and the high voltage DC power transmission line 14. The 800KV isolation knife switches are provided between the smoothing reactors 125a, 125b and the high voltage DC power transmission line 14, and bypass paths 139a, 139b.
    [000114] Figure 26 to Figure 32 illustrate seven electrical wiring modes of operation of the above cascading converter station according to the fourth modality of this invention, respectively: (1) complete bipolar electrical wiring; (2) bipolar operation 3/4 electrical wiring (3) bipolar operation 1/2 electrical wiring (4) monopole total return electrical wiring (5) monopole electrical return 1/2 electrical wiring ( 6) full monopole metal return electrical wiring (7) 1/2 monopole metal return electrical wiring
    [000115] In these seven electrical wiring modes of operation, full bipolar electrical wiring is a mode of electrical wiring in normal operating condition, and other electrical wiring operating modes are those in fault conditions.
    [000116] Referring to Figure 26, which shows the electrical wiring for total bipolar operation in the normal operating condition. Four converter valves 112a, 112b, 122a, 122b at the positive and negative poles of the low voltage terminal converter station 11 and the high voltage terminal converter station 12 are put into operation.
    [000117] Figure 27A, Figure 27B illustrate the electrical wiring of 3/4 of bipolar operation that illustrates a schematic diagram when the low voltage terminal converter valve 122a goes out of operation. Figure 27B illustrates a schematic diagram of the operating electrical wiring when the high voltage terminal converter valve 122a goes out of operation. As shown in Figure 27B, when the high voltage terminal converter valve 122a goes out of operation, a return loop is formed through bypass path 139a, and smoothing reactors 125a, etc. they are not connected to the operating circuit.
    [000118] Figure 28A and Figure 28B illustrate 1/2 electrical wiring for bipolar operation. Figure 28A illustrates a schematic diagram of the operating electrical wiring when the high voltage terminal converter valves 122a and 122b exit the operation. As illustrated in Figure 28A, when the high voltage terminal converter valves 122a and 122b leave the operation, a return loop is formed through the bypass paths 139a, 139b, and the smoothing reactors 125a, 125b, etc. they are not connected to the operating circuit. Figure 28B illustrates a schematic diagram of the operating electrical wiring when the low voltage terminal converter valves 122a and 122b exit the operation.
    [000119] Figure 29 illustrates the full single-pole ground return electrical wiring mode, in which the low voltage end converter valve 112b and the high voltage end converter valve 122b of the positive pole exit the operation, while the end converter valve low voltage terminal 112a and the high voltage terminal converter valve 122a of the negative pole remain in operation.
    [000120] Figure 30A and Figure 30B illustrate the single-pole 1/2 ground electrical wiring mode.
    [000121] Figure 30A illustrates a schematic diagram of operating electrical wiring when converter valves 122a, 122b of the high voltage terminal converter station 12 go out of operation, while only the negative pole converter valve 112a in the low voltage terminal converter station 11 remains in operation. As illustrated in Figure 30A, when the high voltage terminal converter station 122a goes out of operation, a feedback loop is formed through bypass path 139A and ground line 126, and smoothing reactors 125A, etc. they are not connected to the operating circuit.
    [000122] Figure 30B illustrates a schematic diagram of the operating electrical wiring when the converting valves 112a, 112b of the low voltage terminal converter station 11 leave the operation, while only the negative pole converter valve 122a in the high voltage terminal converter station 12 remains in operation.
    [000123] Figure 31 illustrates the total monopole metal return electrical wiring in which the low voltage end converter valve 112b and the high voltage end converter valve 122b of the positive pole exit the operation, while the low end converter valve voltage 112a and the high voltage terminal converter valve 122a of the negative pole remain in operation. As shown in Figure 31, when the high voltage terminal converter valve 122b leaves the operation, a return loop is formed through the bypass path 139b and the metal return line 128, and the smoothing reactors 125b, etc. they are not connected to the operating circuit.
    [000124] Figure 32A and Figure 32B illustrate 1/2 monopole metal return electrical wiring. Figure 32A illustrates a schematic diagram of the operating electrical wiring when the converter valves 122a, 122b of the high voltage terminal converter station 12 leave the operation, while only the negative pole converter valve 112a in the low voltage terminal converter station 11 remains in operation. operation. As illustrated in Figure 32A, when the high voltage terminal converter station 122a and 122b leaves the operation, a return loop is formed through the bypass paths 139a, 139b and the metal return line 128, and the smoothing reactors 125a and 125b, etc. are not connected to the operating circuit.
    [000125] Figure 32B illustrates a schematic diagram of the operating electrical wiring when converter valves 112a, 112b of the low voltage terminal converter station 11 go out of operation, while only the negative pole converter valve 122a in the high voltage terminal converter station 12 remains in operation.
    [000126] The advantage of the fourth modality is that the low voltage terminal converter station 11 and the high voltage terminal converter station 12 can operate independently without interference (for example, in the reconditioning of the converter station), so that energy availability can be improved. When a failure occurs in the smoothing reactors and the DC filter of the high voltage terminal converter station 12, the converter station of the low voltage terminal converter station 11 of the same pole can operate continuously, without a pole interruption.
    [000127] Based on the electrical wiring scheme of the cascading converter station of the fourth modality, other expanded electrical wiring schemes can also be obtained, as illustrated in Figure 33 and Figure 34.
    [000128] Figure 33 illustrates a first expanded electrical wiring scheme based on the above modality, in which MRTB 143 and NBGS 144 are installed on the grounding line of the high voltage terminal converter station 12, and the isolation knife switches 130a , 130b are supplied close to the smoothing reactors. According to this electrical wiring scheme, in-line switching between the monopole ground return mode and the monopole metal return mode of the high voltage terminal converter station 12 can be achieved without passing through the converter station smoothing reactors. cascade, and double pole operation can be achieved using a converter station temporal ground.
    [000129] Figure 34 illustrates a second expanded electrical wiring scheme based on the above modality, in which MRBT 143 and NBGS 144 are installed on the grounding line the high voltage terminal converter station 12. According to this electrical wiring scheme , in-line switching between the single-pole ground return mode and the single-pole metal return mode of the high voltage terminal converter station 12 can be achieved, and double pole operation can be achieved using a converter station temporal ground. Unlike Figure 33, no isolation knife switch 130a and 130b is provided near the smoothing reactors, in the monopole metal operation of the pole converting station, a branch of the smoothing reactor from the other converting station is required.
    [000130] In the cascading converter stations of the first to the fourth modalities and their combinations of expanded structures with Figures 1 to 34, the DC filters are connected through two terminals of the smoothing reactors in the converter station low voltage terminal 11 and in the station high voltage terminal converter 12. However, this DC filter configuration is merely a preferable scheme, but not a limitation. Figures 35 to 37 illustrate other alternative configurations of DC filter, which can be combined with various ways of electrical wiring of the cascading converter stations from the first to the third modalities illustrated in Figures 1 to 34 appropriately (to replace the CC filters in them) . When selecting an electrical wiring scheme for a cascading multiterminal HVDC power transmission system, a DC filter configuration can be selected reasonably according to the design requirements of the current equivalent interference.
    [000131] The equivalent interference current is defined as: a single frequency harmonic current that produces the same interference effect on adjacent or parallel communication lines as the combined interference effect produced by harmonic currents at all frequencies in a line. According to the requirements of a particular project, the equivalent interference current limit can be adjusted accordingly, to balance the cost of harmonic management and the cost of harmonic interference compensation, in order to minimize harmonic management and compensation costs.
    [000132] There are three situations that follow: (1) in the event that it is required to meet a standard on equivalent current interference along the line, the DC filter is connected via two terminals on the smoothing reactors in a converter station configuration dependent as shown in Figures 1 to 34; (2) in the case of permitting current equivalent to precarious interference on the 400KV medium voltage line, the DC filters 142a, 142b for the ground can be provided at the high voltage terminal converter station 12, and the DC filters through the converter stations can be canceled, as shown in Figure 35 and Figure 36. Figure 35 illustrates a situation that has a grounding line 133 provided at the high voltage terminal converter station 12. Figure 36 illustrates a situation that does not have a grounding line 133 provided at high voltage terminal converter station 12. In this case, the harmonic current produced by the converter returns through the grounding grid of the high voltage terminal converter station 12 through the grounding electrode of the low voltage terminal converter station 11; (3) in the case of allowing current equivalent to precarious interference along the line, the DC filters can be canceled as shown in Figure 37.
    [000133] A cascading multiterminal HVDC power transmission system is also provided in this invention. As illustrated in Figure 38, the system comprises a converter station on the sending side, a converter station on the receiving side, and an HVDC power transmission line between them. The converting station on the sending side and the converting station on the receiving side connected to an AC power source and a charging area, respectively. In which, one or both the converter station on the sending side and the converter station on the receiving side are built according to the cascading converter station from the first to the fourth modalities described above. Correspondingly, the AC power source and the load area may comprise one or more AC power sources and load areas.
    [000134] It should be noted that, in this description, for example, the value of the high voltage continuous voltage, the number of isolating knife switches and the type of converter station are all illustrative. Those skilled in the art can make modifications to it according to practical design requirements. In addition, the terms "first", "second", etc. in this description they are used merely to distinguish an entity or transaction from another entity or transaction, and it is necessary to suggest or imply any such specific relationship or sequence of those entities or transactions. In addition, the terms "comprise", "includes", and any variations thereof, are intended to cover a non-exclusive inclusion, such as a process, method, article or apparatus comprising a list of elements not necessarily limited to those elements, but may include other elements not expressly listed or inherent in such a process, method, article or apparatus. In the case of without an additional limitation, the expression "comprising an element" does not prevent the addition of other identical elements in the process, method, article, or apparatus comprising that element.
    [000135] The preferred embodiments of this invention have been described above with reference to the drawings. It is evident, however, that these modalities are merely illustrative, but are not intended to be limitations on the scope of this invention. Those skilled in the art can make various modifications, substitutions and improvements to these modalities without departing from the spirit and scope of this invention. The scope of this invention is only defined by the appended claims.
    权利要求:
    Claims (17)
    [0001]
    1. Cascading converter station used in cascading multiterminal HVDC power transmission, comprising: a low voltage terminal converter station (11) having a positive side and a negative side, each comprising: a converter transformer (111a, 111b) coupled a first alternating current (AC) network (110); a converter valve (112a, 112b) coupled to the converter transformer (111a, 111b) to perform DC / AC conversion; and smoothing reactors (115a, 115b) provided at both ends of the converter valve (112a, 112b); and a high voltage terminal converter station (12), which is connected in series to the low voltage terminal converter station (11) via a medium voltage DC power transmission line (13), and is connected to the transmission line high voltage DC power supply (14), where the high voltage terminal converter station (12) comprises a positive side and a negative side, each comprising: a converter transformer (121a, 121b) coupled to a second current network alternating (AC) (120); a converter valve (122a, 122b) coupled to the converter transformer (121a, 121b) to perform DC / AC conversion; and smoothing reactors (125a, 125b) provided at both ends of the converter valve (122a, 122b); characterized by the fact that it still comprises a grounding line (126) coupled to a grounding electrode and a metal return line (128) coupled between a positive line and a negative line are provided at the low voltage terminal converter station (11 ), and a grounding line (133) coupled to the grounding electrode and a neutral bus isolation knife switch (137a, 137b) are provided at the high voltage terminal converter station (12); one end of the neutral bus isolation knife switch (137a, 137b) is brought into contact with the grounding line (133), the other end of which is brought into contact with the negative or positive output side of the terminal converter station high voltage (12).
    [0002]
    2. Cascading converter station according to claim 1, characterized by the fact that in each of the low voltage terminal converter station (11) and the high voltage terminal converter station (12), a DC filter (117a, 117b , 127a, 127b) is connected via the two terminals of the smoothing reactors (115a, 115b, 125a, 125b).
    [0003]
    3. Cascading converter station according to claim 1, characterized by the fact that a DC filter (142a, 142b) for the earth is provided in the high voltage terminal converter station (12).
    [0004]
    4. Cascading converter station according to claim 1, characterized by the fact that in each of the low voltage terminal converter station (11) and the high voltage terminal converter station (12), a knife switch is provided. bypass isolation (116a, 116b, 126a, 126b) between the smoothing reactors (115a, 115b, 125a, 125b).
    [0005]
    5. Cascading converter station according to claim 1, characterized by the fact that a metal return line (138) coupled between the positive line and the negative line is also provided in the high voltage terminal converter station (12) .
    [0006]
    6. Cascading converter station according to claim 1, characterized by the fact that a bypass path (139a, 139b) of the high voltage terminal converter station (12) is coupled between the medium DC power transmission line voltage (13) and the high voltage DC power transmission line (14).
    [0007]
    7. Cascading converter station according to claim 1, characterized in that a neutral bus switch (140a, 140b) is provided in the high voltage terminal converter station (12).
    [0008]
    Cascading converter station according to claim 7, characterized in that a metal return line (138) coupled between the positive line and the negative line is also provided in the high voltage terminal converter station (12) .
    [0009]
    Cascading converter station according to claim 7 or 8, characterized by the fact that in each of the low voltage terminal converter station (11) and high voltage terminal converter station (12), a DC filter (117a, 117b, 127a, 127b) is connected via the two terminals of the smoothing reactors (115a, 115b, 125a, 125b).
    [0010]
    Cascading converter station according to claim 7 or 8, characterized by the fact that a DC filter (142a, 142b) for ground is provided in the high voltage terminal converter station (12).
    [0011]
    A cascading converter station according to claim 7 or 8, characterized by the fact that in each of the low voltage terminal converter station (11) and the high voltage terminal converter station (12), a power switch is provided bypass isolation knife (116a, 116b, 126a, 126b) between the smoothing reactors (115a, 115b, 125a, 125b).
    [0012]
    Cascading converter station according to claim 7, characterized in that a path to bypass (139a, 139b) the high voltage terminal cascade converter station (12) is coupled between the DC power transmission line medium voltage (13) and the high voltage DC power transmission line (14).
    [0013]
    Cascading converter station according to claim 12, characterized in that a metal return transfer switch (138) and a neutral bus ground switch (144) are provided in the high voltage terminal converter station (12).
    [0014]
    Cascading converter station according to claim 12 or 13, characterized by the fact that at each of the low voltage terminal converter station (11) and the high voltage terminal converter station (12), a DC filter (117a , 117b, 127a, 127b) is connected via the two terminals of the smoothing reactors (115a, 115b, 125a, 125b).
    [0015]
    Cascading converter station according to claim 12 or 13, characterized by the fact that a DC filter (142a, 142b) for earth is provided at the high voltage terminal converter station (12).
    [0016]
    A cascading converter station according to claim 12 or 13, characterized in that a low voltage terminal converter station (11) and a high voltage terminal converter station (12) are provided with a power switch. bypass isolation knife (116a, 116b, 126a, 126b) between the smoothing reactors (115a, 115b, 125a, 125b).
    [0017]
    17. Cascading multiterminal HVDC energy transmission system, comprising: a sending side converter station, a receiving side converter station, and a high voltage DC power transmission line (14) between them, characterized by the fact that that at least one of the sending side converter station and the receiving side converter station is constructed according to the cascading converter station as defined in one of claims 1,5, 11, 16.
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    同族专利:
    公开号 | 公开日
    WO2012075610A1|2012-06-14|
    BR112013014380A2|2016-09-27|
    US9172248B2|2015-10-27|
    US20130322131A1|2013-12-05|
    TR201810486T4|2018-08-27|
    EP2650998A4|2016-04-27|
    EP2650998A1|2013-10-16|
    ES2681533T3|2018-09-13|
    EP2650998B1|2018-04-25|
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    2020-10-20| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 09/12/2010, OBSERVADAS AS CONDICOES LEGAIS. |
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    申请号 | 申请日 | 专利标题
    PCT/CN2010/002001|WO2012075610A1|2010-12-09|2010-12-09|Cascade converter station and multi-end cascade hvdc power transmission system|
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