• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    DC ELECTRIC POWER SYSTEM TO SUPPLY A VESSEL AND FAILURE MANAGEMENT METHOD IN A DC SUPPLY SYSTEM. It is a DC power supply system (1) comprising a DC main bus (3), a power generation unit (P1, P2, P3, P4) arranged to feed the DC main bus (3), a switch insulator (7) arranged between the main DC bus (3) and the power generating unit (P1, P2, P3, P4) to isolate the power generating unit (P1, P2, P3, P4) from the main DC bus (3) in the event of a DC main bus failure, a drive unit (D1, D2) arranged to be powered by the DC main bus, wherein the drive unit (D1, D2) comprises a drive unit bus system. drive (DB), conversion units (I1, I2, I3) connected to the drive unit bus system (DB) and fuses (F) arranged between the drive unit bus system (DB) and the conversion units (I1, I2, I3) to protect the converter units (I1, I2, I3) in case of a drive unit failure.
    公开号:BR112014019687B1
    申请号:R112014019687-7
    申请日:2013-01-24
    公开日:2021-06-08
    发明作者:John Lindtjørn
    申请人:Abb Schweiz Ag；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    [001] The present invention relates, in general, to power systems and, particularly, to a DC power system with protection features. BACKGROUND
    [002] Power systems typically comprise a plurality of components, such as one or more power generation sources, drivers and energy storage modules. These components are typically interconnected through a busbar system in which currents can flow to supply power to one or more loads connected to the power system.
    [003] At a given point, a failure such as a short circuit will inevitably occur in the power system, either in the busbar system, in one of the system components, or in a load. In the event of a failure, it is important to isolate the failure from the healthy part of the system so that normal power supply can be maintained through the healthy part and to protect the healthy parts from damage. For this purpose, a protection system is typically included in the power system.
    [004] A protection system arranged to deal with human failures in a power system typically comprises monitoring equipment arranged to monitor electrical parameters, such as currents in the power system and circuit breakers controlled by the monitoring equipment. The circuit breakers are arranged in such a way that, in the power system, this selective fault isolation can be achieved in the event of a fault.
    [005] Existing protection systems can, however, in some applications, be very expensive and bulky. SUMMARY
    [006] Direct current (DC) circuit breakers are particularly large due to the fact that, unlike alternating current (AC) circuit breakers, they may not rely on zero crossings. Therefore, larger air gaps are required for DC breakers in order to ensure proper protection. As a result, DC circuit breakers typically take up large volumes of space and are expensive to manufacture.
    [007] In view of the above considerations, the general objective of the present disclosure is to provide a DC power system that has protection features that require less space than those of the prior art.
    [008] Another goal is to provide a DC power system that is affordable.
    [009] Therefore, a DC power system is provided comprising: a main DC bus, a power generation unit arranged to power the main DC bus, an isolating switch arranged between the main DC bus and the power generation unit. power to isolate the power generating unit from the main DC bus in case of failure of the main DC bus and a drive unit arranged to be powered by the main DC bus, wherein the drive unit comprises a drive unit bus system , converter units connected to the busbar system of the drive unit and fuses arranged between the busbar system of the drive unit and the converter units to protect the converter units in case of drive unit failure.
    [0010] With this, the various units in the DC power system can selectively be protected in case of failure in any of the units or in the main DC bus, without the use of large, bulky and expensive circuit breakers.
    [0011] According to an embodiment, the drive unit comprises a first type of input unit arranged between the main DC bus and the drive unit bus system and wherein the first type of input unit comprises an isolating switch to disconnect the drive unit from the main DC bus in case of a drive unit failure. Therefore, the drive unit can be disconnected from the remaining DC power system in the event of a drive unit failure without the use of circuit breakers.
    [0012] According to an embodiment, the first type of input unit comprises a current blocking device arranged to block currents in one direction from the drive unit bus system to the main DC bus and to allow current flows from the main DC bus to the drive unit. With this, current faults that could be provided for faults in the main DC bus or in another unit connected to the main DC bus from the capacitor banks of the converter units in the drive unit can be reduced or eliminated with the device blocking current essentially acting as an open circuit towards the bus system from the drive unit to the main DC bus.
    [0013] One mode comprises an energy storage unit arranged to power the main DC bus, wherein the energy storage unit comprises an energy storage unit bus system, the energy supply units and fuses arranged between the energy storage unit bus system and the energy supply units for the protection of the energy supply units in case of failure of an energy storage unit. In this way, if a reserve power component for, for example, redundancy purpose is added to the system, that component can also be protected from internal faults without the use of circuit breakers.
    [0014] According to an embodiment, the energy storage unit comprises a second type of input unit arranged between the bus system of the energy storage unit and the main DC bus, wherein the second type of input unit comprises an isolating switch for disconnecting the energy storage unit from the main DC bus in case of failure of an energy storage unit. In this way, the energy storage unit can be disconnected from the main DC bus without the use of circuit breakers.
    [0015] According to an embodiment, the second type of input unit comprises a current blocking device arranged to block currents in one direction from the energy storage unit bus system to the main DC bus and to allowing current to flow from the main DC bus to the energy storage unit, and a semiconductor switching unit so that current is allowed to bypass the current blocking device and flow to the main DC bus selectively. Therefore, current can be allowed to flow to the main DC bus in case additional energy is required from the energy storage unit by setting the semiconductor switching unit in its on state.
    [0016] Alternatively, fault currents from the energy storage unit to a fault in the main DC bus or in other parts of the DC power system can be minimized in case the semiconductor switching unit is set to its off state.
    [0017] According to an embodiment, the current blocking device and the semiconductor switching unit are connected in an antiparallel way.
    [0018] According to an embodiment, the power generating unit comprises a generator and a repairer, wherein the repairer includes a plurality of fuses arranged to protect the repairer in the event of a repairer's failure. Through this, the repairer's internal faults can be handled through the fuses without using local circuit breakers in the power generation unit.
    [0019] According to an embodiment, the plurality of fuses included in the repairer is dimensioned so that they do not explode when subjected to fault currents as a result of faults downstream of the repairer. Therefore, the fuses are only blown by currents caused by internal faults in the repairer. Fault currents provided for faults outside the power generating unit must therefore not cause the fuse to blow. The current power of the fuses in the repairer must therefore be selected to be at the limit current level which is only reached or exceeded by fault currents created by the repairer faults in the particular power generating unit.
    [0020] According to a modality, each conversion unit has terminals connected to the bus of the drive unit, in which each terminal of the conversion unit is connected to the fuse.
    [0021] According to an embodiment, the current blocking device is a diode.
    [0022] According to an embodiment, the first input unit comprises a semiconductor switching unit antiparallel connected with the current blocking device to allow current to selectively bypass the current blocking device and flow to the DC bus main.
    [0023] By combining isolating fuses and switches as described in this document, a hybrid protection system is obtained where local faults, that is, faults in a specific unit are handled by fuses and where total faults, i.e., faults in a main dc bus, are handled by interrupting the current source such as an appropriate isolating switch that can isolate the affected part of the dc power system. Therefore, the fuse size can be kept smaller, ensuring that the extent of local fault currents is capable of blowing the fuse in the event of a local fault, thus ensuring confidence in protecting the DC power system locally and globally. If necessary, additional capacitor banks can be installed to provide extra fault current to ensure the fuses have sufficient fault current available to clear a fault.
    [0024] In general, all terms used in the embodiments are to be interpreted according to their common meaning in the field of the art, unless explicitly defined otherwise herein. All references to "an element, apparatus, component, means, etc. shall be interpreted as freely referring to at least one instance of the element, apparatus, component, means, etc., otherwise unless explicitly stated otherwise. BRIEF DESCRIPTION OF THE DRAWINGS
    [0025] The specific modalities of the inventive concept will now be described, by way of example, with reference to the attached drawings, in which:
    [0026] Figure 1 is a schematic diagram of a DC power system;
    [0027] Figure 2 is a schematic diagram of a power generation unit in the DC power system in Figure 1;
    [0028] Figure 3a represents an example of a failure in the DC power system in Figure 1; and
    [0029] Figure 3b represents another example of a failure in the DC power system in Figure 1. DETAILED DESCRIPTION
    [0030] The inventive concept will now be more fully described below with reference to the accompanying drawings, in which exemplary embodiments are shown. The inventive concept can, however, be carried out in different ways and should not be interpreted as being limited to the forms of modalities established in this document; preferably, these embodiments are provided by way of example so that this disclosure is thorough and complete and fully conveys the scope of the inventive concept to those skilled in the art. The same numbers refer to the same elements throughout the description.
    [0031] Figure 1 represents a schematic diagram of an example of a DC power system 1. The DC power system 1 comprises a main DC bus 3 having a first busbar 3-1 and a second busbar 3-2 separated by means of a busbar interconnecting circuit breaker 5, a first power generating unit P1, a second power generating unit P2, a third power generating unit P3, a fourth power generating unit P4, a unit of energy storage E, a first D1 drive and a second D2 drive.
    [0032] The first drive unit D1 and the second drive unit D2 are arranged to energize electric motors and similar equipment. Examples of such drive units are single drives, multiple drives and static frequency converters designed to supply normal AC consumers with 50 Hz or 60 Hz AC power.
    [0033] The DC power system 1 further comprises an isolating switch 7, i.e. disconnect switches associated with a respective power generation unit P1, P2, P3, P4 to be able to disconnect the power generation units P1, P2, P3, P4 of main DC bus 3. Through this, each power generating unit can be isolated from a fault in, for example, main DC bus 3, or they can be isolated for maintenance purposes.
    [0034] The first power generation unit P1 is arranged to power the main DC bus 3 and is connectable to the main DC bus 3 through an isolating switch 7. According to the example in Figure 1, the first power generation unit power P1 is connected to the first busbar 3-1.
    [0035] The second power generation unit P2 is arranged to power the main DC bus 3 and is connectable to the main DC bus 3 through an isolating switch 7. According to the example in Figure 1, the second power generation unit P2 power is connectable to the first busbar 3-1.
    [0036] The third power generation unit P3 is arranged to power the main DC bus 3 and is connectable to the main DC bus 3 through an isolating switch 7. According to the example in Figure 1, the third power generation unit P3 power is connectable to the second busbar 3-2.
    [0037] The fourth power generation unit P4 is arranged to power the main DC bus 3 and is connectable to the main DC bus 3 by means of an isolating switch 7. According to the example in Figure 1, to the fourth generation unit power supply P1 is connectable to the second busbar 3-2.
    [0038] The first power generation unit P1 comprises a generator G1, such as a diesel engine driven generator, arranged to generate alternating current and a repairer R1 arranged to convert alternating current to direct current to be fed to the busbar DC Main 3. Repairer R1 can be provided with fuses sized to blow in the event of repairer R1 failure.
    [0039] The second power generation unit P2, the third power generation unit P3 and the fourth power generation unit P4 may have a similar design as the power generation unit P1. To that end, each of the second power generating unit P2, the third power generating unit P3 and the fourth power generating unit P4 may comprise a respective G2, G3, G4 generator and a R2, R3 repairer. Respective R4 to supply DC signals to the main DC bus 3. However, it is noted that a combination of different types of generators is possible with the same system.
    [0040] Each of the first D1 drive unit and the second D2 drive unit has a DB drive unit bus system in which it comprises a first DB1 bus and a second DB2 bus. In addition, each of the first D1 drive unit and the second D2 drive unit has several conversion units, as exemplified below by inverters I1, I2, I3, connected to the respective drive unit bus system of the same DB , and fuses F arranged between the terminals and the inverters I1, I2, I3 and the bus system of the DB drive unit. An example of a suitable drive is ABB's ACS800 drive.
    [0041] Each of the first drive unit D1 and the second drive unit D2 additionally has a first type of input unit 17 which at one end is arranged for connection to the main DC bus 3. To this other end the first type of input unit 17 is connected to the bus system of the DB drive unit. The first type of input unit 17 comprises an isolating switch arranged to disconnect the drive unit D1, D2 from the main DC bus 3 and a current blocking device 11 which is capable of blocking the flow of current in one direction of the system. DB drive unit busbar to the main DC busbar 3 and allow current to flow in one direction from the main DC busbar 3 to the DB drive unit busbar system. Such a current blocking device may be a semiconductor device such as a diode or multiple diodes, or a bipolar gate transistor (IGBT), thyristor, or similar devices.
    [0042] Note that, depending on the application, the drive units can be designed with different numbers of inverters, from one inverter to a plurality of inverters. In addition, the first type of drive unit may, in one embodiment, comprise a semiconductor switching unit antiparallel connected to the current blocking device, thus allowing for a reverse power supply during normal operation of the power system. CC Such a semiconductor switching unit can, for example, be a bipolar gate transistor (IGBT).
    [0043] The energy storage unit E has a bus system of the energy storage unit EB which has a first bus EB1 and a second bus EB2. The energy storage unit E further comprises energy supply units such as the battery unit B and a capacitor bank C connected to the bus system of the energy storage unit EB, a CC-CC converter 15 connected to the bus system of the energy storage unit EB, and fuses F. The fuses F are arranged between the terminals of the DC-DC converter 15 and the bus system of the energy storage unit EB, between the capacitor bank C and the bus system of the unit EB energy storage unit, and between the battery unit B and the bus system of the EB energy storage unit.
    [0044] By means of the DC-DC converter 15, the voltage level of the output of battery unit B can be controlled if power is supplied to the main DC bus 3 from the energy storage unit E.
    [0045] It should be noted that the energy storage unit E is an example of many possible configurations relating to the number of power supply units and converters. For example, some variations of energy storage unit E do not have a capacitor bank. The general purpose of a bank of capacitors in the energy storage unit is to contribute to blown fuses in the event of an internal failure.
    [0046] The energy storage unit E additionally has a second type of input unit 9 which at one end is arranged to connect to the main DC bus 3. At the other end thereof, the second type of input unit 9 is connected to the EB energy storage unit bus system. The second type of input unit 9 comprises an isolating switch for disconnecting the energy storage unit E from the main DC bus 3, a semiconductor switching unit 13 and a current blocking device 11 which is capable of blocking current flow. in the direction of the EB energy storage unit bus system to the main DC bus 3 and to allow current to flow in the direction from the main DC bus 3 to the EB energy storage unit bus system. Such a current blocking device can be a semiconductor device such as a diode or several diodes, or an IGBT, a thyristor, or similar devices. The semiconductor switching unit 13 can, for example, be an IGBT. The semiconductor switching unit 13 and the current blocking device 11 can be arranged anti-parallel, thereby allowing current to flow in the direction from the bus system of the energy storage unit EB to the main DC bus 3s. the semiconductor switch device 13 is set in its saturated or open state by means of appropriate control signals. Therefore, by means of the current blocking device 11 and the semiconductor switching unit 13, the current can selectively allow the bypass of the current blocking device and flow to the main DC bus 3.
    [0047] Figure 2 is a schematic diagram of power generation unit P1. Internal components of repairer R1 are shown. For each electrical phase, the AC signal generated by generator G1 is supplied to each respective member of repairer R1. T-switch devices are provided for each member where the T-switch device can be controlled so that a CC signal can be emitted by repairer R1. In the example in Figure 2, switching devices are exemplified by thyristors, although other switching means are also possible, for example IGBTs. In addition, the repairer R1 comprises F fuses for protection of the repairer R1 in case of failure, ie a short-circuit in the repairer R1. In this case, one or more of the fuses will blow in response to the fault currents flowing to the fault through fuses F. In the example in Figure 2, each switch device T is associated with a fuse F. that is, each phase is associated with two fuses F. Other possible realizations of the power generating unit P1 include a designed crowbar together with a diode under a diode on the positive pole of the DC repair terminals. The general idea is that if an internal failure occurs, the repairer with the generator will isolate itself from the DC power system to minimize the consequences for the wider system.
    [0048] Fuses F in the repairer are advantageously dimensioned so that they do not explode when subjected to fault currents as a result of faults downstream of the repairer. The term downstream is to be understood in relation to a flow of current towards the DC power system l.
    [0049] Figure 3a is an example of a situation where fault 19 occurs in DC power system 1. In the example of Figure 3a, fault 19 is a short circuit and occurred in main DC bus 3. Fault 19 it is therefore a total failure. Several failure handling strategies are possible in this case.
    [0050] In both cases, due to fault 19, fault currents 20-1, 20-2, 20-3, 20-4 flow to the place of fault 19, which is in the first busbar 3-1 in this example. In general, fault 19 is detected by at least a plurality of monitoring sensors of the DC power system 1, for example current measuring sensors.
    [0051] According to a strategy to handle the fault, the tie breaker 5 generates the open command as a detected fault. The healthy part, ie the second busbar 3-2 restarts after the vault. Thus, once the DC power system has split the healthy part, it resumes operation. The faulty side, ie the first busbar 3-1, if aware of the location of the faults, will not reset. If it is not aware of the location, due to lack of information, the faulty side would attempt a restart to detect the fault.
    [0052] In another version of the strategy, the rectifiers R1, R2, R3, R4 of the P1-P4 power generation units are controlled so that their current output tends to zero, and any other energy source could also limit the current in the DC power system while generating the open command for the tie breaker 5. Once the system is split, the healthy part will detect that the fault is cleared, while the faulty side will see the fault persist. This will cause power sources, for example, power generation units on the faulty side to block current at fault.
    [0053] In yet another version of the strategy, power sources can limit their output voltage and currents to a level that would allow an isolating switch to operate within its ratings, where isolating switch 7 can disconnect the generation unit main DC bus power supply 3.
    [0054] The first drive unit D1 and the second drive unit D2 do not contribute or at least minimally contribute to the fault current due to the current blocking characteristic of the current blocking device 11. Furthermore, due to the isolating switch of the first type of input unit 17, the first drive unit D1 and the second drive unit D2 can be disconnected from the main DC bus 3. With this, each of the first drive unit D1 and the second drive unit D2 drive can be protected in the event of a main DC bus failure 3.
    [0055] Energy storage unit E is also protected during fault 19 on main DC bus 3. If energy storage unit E is in the intermediate phase of supplying power to main DC bus 3 before the occurrence of Fault 19, the output current of the DC-DC converter 15 can be controlled, for example set to zero. Through this, the energy storage unit E can be isolated from the main DC bus 3 by means of the isolating switch of the second type of input unit 9. Furthermore, before the energy storage unit E is isolated from the main DC bus 3 , the second type of input unit 9 can block the current from flowing to the fault 19. This is achieved by means of current blocking device 11 of the second type of input unit 9 and by setting the semiconductor switching unit 13 in its off state.
    [0056] By means of the current blocking properties of the first type of input device 17 and the second type of input device 9, the fault currents for fault 19 can be reduced.
    [0057] With reference to Figure 3b, the situation where fault 22 occurred in the first drive unit D1 will now be described. This failure is therefore a place of failure in the first drive unit D1.
    [0058] According to the example in Figure 3b, a short circuit occurred in the bus system of the DB drive unit. The first DB-1 bus and the second DB-2 bus can, for example, be short-circuited. When fault 22 occurs, currents 231, 23-2, 23-3, 23-4 and 23-5 flow to fault 22. Currents 23-3, 234, 23-5 are supplied by capacitor banks in the drives I1, I2, I3. As the currents 23-3, 23-4, 23-5 supplied by the capacitor banks flow through the fuses F arranged in the first drive unit D1, the fuses F will probably blow, thereby disconnecting the inverters I1, I2, I3 from the faults 22. The load connected to inverters I1, I2, I3 is thus disconnected from the busbar system of the DB drive unit. As the current of the power generating units P1, P2, P3, P4 is reduced, for example, by proper control of the rectifiers R1, R2, R3, R4, the isolating switch of the first type of input unit 17 of the first unit of drive D1 can be disconnected from the first drive unit D1 of main DC bus 3, and therefore isolate fault 22. When fault 22 has been isolated, the remaining parts of DC power system 1 can resume normal operation.
    [0059] Essentially no current is supplied to fault 22 by the capacitor banks of the second drive unit D2 due to the current blocking device 11 in the first type of input unit 17 of the second drive unit D2.
    [0060] Furthermore, the second type of input unit 9 of the energy storage unit E can block current flow to fault 22. This is achieved by means of current blocking device 11 of the second type of energy storage unit input 9 and setting the semiconductor switching unit 13 to its off state.
    [0061] Therefore, by means of current blocking properties of the first type of input device 17 and the second type of input device 9, the fault currents for fault 22 can be reduced.
    [0062] In situations where the fault occurs downstream of an inverter I1, I2, I3, such a fault is typically handled by the F fuses of that inverter.
    [0063] In general, failures downstream of fuses within a unit, such as a power generating unit, an energy storage unit or a drive unit, are handled by the fuses of that unit.
    [0064] The DC power system described in this document can be advantageously used as an embedded power system to power a vessel, or as a power system in other confined spaces where large DC circuit breakers are undesirable. The present DC power system is typically used in a low voltage environment, although higher voltage applications, eg medium voltage, are also anticipated.
    [0065] The inventive concept has been described above mainly with reference to some examples. However, as is easily perceived by a person skilled in the art, other modalities than those disclosed above are equally possible within the scope of the inventive concept, as defined by the attached embodiments. For example, a DC power system in accordance with the present disclosure may include fewer or more power generation units than in the example described in Figure 1. Furthermore, the DC power system need not include an energy storage unit. or it can include additional energy storage units and/or fewer or more drive units.
    权利要求:
    Claims (11)
    [0001]
    1. DC power system (1) to power a vessel, characterized in that it comprises a main DC bus (3), a power generation unit (P1, P2, P3, P4) arranged to power the main DC bus (3) , a disconnect switch (7) arranged between the main DC bus (3) and the power generation unit (P1, P2, P3, P4) to isolate the power generation unit (P1, P2, P3, P4) from the main DC bus (3) in case of a failure of the main DC bus (3), and a drive unit (D1, D2) arranged to be powered by the main DC bus (3), with the drive unit (D1, D2) comprises a drive unit bus system (DB), conversion units (I1, I2, I3) connected to the drive unit bus system (DB) and fuses (F) arranged between the unit bus system drive units (DB) and the conversion units (I1, I2, I3) to protect the conversion units (I1, I2, I3) in case of u failure of the drive unit, the drive unit (D1, D2) comprising a first type of input unit (17) arranged between the main DC bus (3) and the drive unit bus system (DB) , and the first type of input unit (17) comprising a disconnect switch for disconnecting the drive unit (D1, D2) from the main DC bus (3) in case of a drive unit failure.
    [0002]
    2. DC power system (1) according to claim 1, characterized in that the first type of input unit (17) comprises a current blocking device (11) arranged to block currents in a direction to from the drive unit (DB) bus system to the main DC bus (3) and to allow current to flow from the main DC bus (3) to the drive unit (D1, D2).
    [0003]
    3. DC power system (1) according to claim 1 or 2, characterized in that it comprises an energy storage unit (E) arranged to power the main DC bus (3), the energy storage unit being (E) comprises an energy storage unit (EB) busbar system, energy supply units (B, C) and fuses (F) arranged between the energy storage unit (EB) busbar system and the power supply units (B, C) for protecting the power supply units (B, C) in the event of a failure of an energy storage unit.
    [0004]
    4. DC power system (1) according to claim 3, characterized in that the energy storage unit (E) comprises a second type of input unit (9) arranged between the unit bus system storage unit (EB) and the main DC bus (3), the second type of input unit (9) comprising a disconnect switch for disconnecting the energy storage unit (E) from the main DC bus (3) in case of a failure of an energy storage unit.
    [0005]
    5. DC power system (1) according to claim 4, characterized in that the second type of input unit (9) comprises a current blocking device (11) arranged to block currents in a direction of the energy storage unit (EB) bus system to the main DC bus (3) and to allow current to flow from the main DC bus (3) to the energy storage unit (E), and a semiconductor switching unit (13) to selectively allow current to bypass the current blocking device (11) and flow to the main DC bus (3).
    [0006]
    6. DC power system (1), according to claim 5, characterized in that the current blocking device (11) and the semiconductor switching unit (13) are connected in an antiparallel way.
    [0007]
    7. DC power system (1), according to any one of the preceding claims, characterized in that the power generation unit (P1, P2, P3, P4) comprises a generator (G1, G2, G3, G4 ) and a rectifier (R1, R2, R3, R4), the rectifier (R1, R2, R3, R4) including a plurality of fuses (F) arranged to protect the rectifier (R1, R2, R3, R4) at in case of a failure of a rectifier.
    [0008]
    8. DC power system (1), according to claim 7, characterized in that the plurality of fuses (F) included in the rectifier (R1, R2, R3, R4) is dimensioned in such a way that they do not they explode when subjected to fault currents as a result of faults downstream of the rectifier (R1, R2, R3, R4).
    [0009]
    9. DC power system (1), according to any one of the preceding claims, characterized in that each converter unit (I1, I2, I3) has terminals connected to the drive unit (DB) bus, each terminal of a converter unit (I1, I2, I3) is connected to a fuse (F).
    [0010]
    10. DC power system (1), according to any one of claims 2 to 9, characterized in that the current blocking device (11) is a diode.
    [0011]
    11. DC power system (1) according to any one of claims 2 to 10, characterized in that the first input unit comprises a semiconductor switching unit connected in an antiparallel way with the current blocking device (11 ) to selectively allow current to bypass the current blocking device (11) and flow to the main DC bus (3).
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    法律状态:
    2017-12-26| B25A| Requested transfer of rights approved|Owner name: ABB SCHWEIZ AG (CH) |
    2018-01-30| B25L| Entry of change of name and/or headquarter and transfer of application, patent and certificate of addition of invention: publication cancelled|Owner name: ABB TECHNOLOGY AG (CH) |
    2018-02-06| B25C| Requirement related to requested transfer of rights|Owner name: ABB TECHNOLOGY AG (CH) |
    2018-05-29| B25L| Entry of change of name and/or headquarter and transfer of application, patent and certificate of addition of invention: publication cancelled|Owner name: ABB SCHWEIZ AG (CH) Owner name: ABB SCHWEIZ AG (CH) Free format text: ANULADA A PUBLICACAO CODIGO 25.3 NA RPI NO 2457 DE 06/02/2018 POR TER SIDO INDEVIDA. |
    2018-06-05| B25A| Requested transfer of rights approved|Owner name: ABB SCHWEIZ AG (CH) |
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-12| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-10-06| B25G| Requested change of headquarter approved|Owner name: ABB SCHWEIZ AG (CH) |
    2021-04-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-08| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 24/01/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP12157487.5|2012-02-29|
    EP12157487.5A|EP2634885B1|2012-02-29|2012-02-29|A DC-power system with system protection capabilities|
    PCT/EP2013/051314|WO2013127575A1|2012-02-29|2013-01-24|A dc-power system with system protection capabilities|
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