• 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:
    In order to provide an apparatus (1) for flexible power transmission and for deicing of a high-voltage line, which has a plurality of phases, by means of direct current, with an AC voltage connection of the high-voltage line which has a number of phases corresponding to the phases of the high-voltage line, each phase having at least one inductance (6) and a valve circuit (10) connected in series with each inductance (6), with the valve circuit (10) being connected by means of a junction point (11) to the AC voltage connection, and having a first current path (14) with a first power semiconductor valve (12) and a second current path (15) with a second power semiconductor valve (13), with the power semiconductor valves (12, 13) being connected in opposite senses with respect to one another with reference to the junction point (11) and in which case the first and the second current path (15) can be connected to a TCR star point by means of at least one star point switch (16, 17), whose design is simple and at the same time costs little, it is proposed that the TCR star point (18) is connected via a connecting line to a star point of a zero phase-sequence system suppression means (2, 21).
    公开号:SE534603C2
    申请号:SE0950466
    申请日:2007-11-14
    公开日:2011-10-18
    发明作者:Kadry Sadek；Frank Schettler；Karl Uecker
    申请人:Siemens Ag；
    IPC主号:
    专利说明:

    534 603 Devices of the type indicated in the introduction are used for de-icing high-voltage lines. Particularly in relatively cold climates, high-voltage lines, such as air lines used for the transmission of alternating current, become loaded with formations of snow and ice on the high-voltage line. The weight of the ice can be up to many tons and can lead to mechanical damage to the high voltage line. In order to melt the ice, a direct current can be supplied in a controlled manner to the high-voltage line, with this direct current heating the high-voltage line and thus causing the snow and ice to melt and fall off. Particularly in the case of long high-voltage lines, the length of which can exceed several hundred kilometers, direct current is more efficient than alternating current, as it can be better controlled.
    An object of the invention is to provide a device described above, the construction of which is simple and at the same time cost-effective.
    The invention achieves this object in that the TCR star point is connected via a connecting line to a star point of a zero system attenuator.
    The device according to the invention, like the device of the generic type, has two operating modes. In the TOR position, reactive power is absorbed from the high voltage line to which the device according to the invention is connected. In so-called HVDCT mode, in contrast, direct current can be intentionally applied to the high voltage line. In the applications of the invention, the phases of the devices are interconnected in star coupling in the TOR position, although WO 2006/027376 A1 states that star coupling has the disadvantage that these third or ninth harmonics of the rated current cannot be suppressed or absorbed, so that these harmonics can flow into the AC mains without obstruction. These currents are hereinafter referred to as zero system currents, since these harmonics are not automatically attenuated in a star-connected TCR, as opposed to harmonics in a positive and negative phase sequence system. To prevent zero system currents in the AC network, in the practice of the invention, the TCR star point is connected to a star point of a zero system attenuator. The current of the zero system thus goes via the star point of the TCR to the star point of the zero system attenuator, which prevents zero system currents from being introduced into the AC network. This makes it possible to avoid the need for complex delta connection with a large number of insulating circuit breakers. The design of the device according to this invention is therefore simple, and cost effective. According to the invention, the zero system current in TCR position flows via earth from the TCR star point to the ground point of the zero system attenuator, and from the zero system attenuator via the connected star point switch back to the star point of the TCFV, so that a closed circuit is provided.
    A further current path is provided, according to the invention, which has such a low impedance for the zero system current that it prevents zero system currents from being fed into the connected high voltage line.
    The connecting line is advantageously a ground connection. In other words, the TCR star point and the zero system attenuator are grounded. This solution is of course cost effective.
    In contrast, the connecting wire is a metallically connecting wire.
    The zero system attenuator is advantageously a transformer having the primary winding connected in delta and a secondary winding connected in star. If the connecting wire is a ground wire, then both the TCB star point and the star point of the secondary winding are grounded. Thus, in TCR mode, the zero system flows from the TOR star point to the transformer, the primary winding of the transformer connected in the delta preventing zero system currents from being fed into the connected AC network. In contrast, the zero system attenuator is at least one zero system filter. The zero system filter, for example, is tuned to have a low impedance for the third harmonic, and has an appropriate circuit formed of inductors and capacitors. The zero system filter has a number of phases corresponding to the phases of the high voltage line, the phases of the zero system filter being connected to each other at the star point. Said star point is connected to the TCB star point either via a metallic connecting line or via an earth circuit. In other words, the star point of the zero system filter is grounded. Zero system filters are known to a person skilled in the art, therefore they do not need to be described in more detail here.
    When the star point switches are closed, the device according to the invention for zero system currents thereby provides a closed circuit with low impedance.
    Each phase advantageously has a plurality of inductances, at least one inductance being bridgeable by a bridge switch. For example, when the device is in the so-called TOR position, the additional inductances are not bridged, the increased inductance having a positive effect on the operation of the device. In the so-called HVDCT mode, on the other hand, it is expedient to reduce the inductance by bridging at least one of these additional inductances.
    Filtering means are advantageously provided for attenuating the fifth, seventh and / or twelfth harmonics. These additional means for filtering prevent said harmonics, which are not part of the zero system, from being fed into the high voltage line which can be connected to the device.
    Further expedient embodiments and advantages of the invention are the subject of further description of exemplary embodiments of the invention with reference to the figures in the drawings, the same reference symbols referring to components having the same effect, and wherein, Figure 1 shows a first embodiment of the device according to the invention, 2 shows a second embodiment of the device according to the invention.
    Figure 1 shows a first embodiment of the device 1 according to the invention, which has a transformer 2 as alternating voltage connection. In other words, the transformer 2 is used as a connection of the device 1 according to the invention to a multiphase high voltage line which is not illustrated in Figure 1. The device 1 likewise has a plurality of phases, of which only one phase is illustrated in Figures 1 and 2, for the sake of clarity. sake. In general, the device according to the invention has three phases.
    The transformer 2 has a primary winding 3 and a secondary winding 4. The phases of the primary winding 3 are connected to each other to what is called a delta. The phases of the secondary winding 4 form a common star point with each other, as if grounded.
    The device 1 according to the invention further has a serial circuit 5, which has an inductance 6 and an inductance 7. A bridging switch 8 is provided parallel to the inductance 7, and is arranged in a bridging branch 9.
    The serial circuit 5 further has a valve circuit 10 with a connection point 11 arranged between two power semiconductors 12 and 13. The power semiconductors 12 and 13 are connected opposite to each other relative to the branch point 11. The power semiconductor valve 12 is arranged in a first current path 14 while the power semiconductor valve 13 , in contrast, is arranged in a second current path 15, whereby the current paths 14 and 15 are connected to a TOR star point 18 via a first insulating switch 16 and a second insulating switch 17, respectively. Figure 1 indicates that the phases, which are not shown, are also connectable. with the TCR star point 18 via their valve circuit 10. Thus, the TCF1 star point 18 is grounded.
    The device 1 is shown with the switches 16 and 17 closed, is therefore in the so-called TCFt position and is used to absorb reactive force from the multiphase high voltage line. For this reason, the bridging switch 8 is open, thus providing an increasing inductance in the serial circuit 5, which is advantageous for the device 1 when in the TCR position. Additional means for filtering 19, which are known to a person skilled in the art and therefore need not be described further here, are provided to suppress the fifth, seventh, twelfth, and / or twenty-fourth harmonic of marked current. Additional means for filtration 19 are not grounded, for example.
    The star point of the device 1 according to the invention results in harmonics in the positive phase sequence and the negative phase sequence being extinguished. However, the zero system flows via the connecting line, in the form of a ground connection, from the TCB star point 18 to the star point on the secondary winding 4 and from there, for example back to the serial circuit 5, thus providing a closed circuit with low impedance. The delta connection of the phases on the primary winding 3 prevents zero system currents from being introduced into the high voltage line.
    Furthermore, Figure 1 indicates the HVDCT position of the device 1 according to the invention. For this reason, a busbar 20 is only virtually extended by a dashed line. The HVDCT position of the device 1 is indicated on the right, at the end of the dashed line. In HVDCT mode, switches 16 and 17 are open. For this reason, the first current path 14 is no longer connected to the second current path 15 and is therefore also no longer connected to the TCB star point 18. Furthermore, the bridging switch 8 is closed, so that the inductance 7 in the serial circuit 5 is reduced compared to when the device 1 is in TCR position.
    The power semiconductor valves 12 and 13 no longer appear as bidirectional switches but as current valves in a six-pulse bridge circuit, thus providing a so-called rectifier.
    The current paths 14 and 15 thus form direct current connections in the device 1. A compensating inductor, which is not shown in Figure 1, is used to equalize rectified current. The direct current can now be fed into the high-voltage line, and can be used there to melt snow and ice.
    Figure 2 further shows examples of embodiments of the device 1 according to the invention.
    The device 1 according to the invention differs from the exemplary embodiment in Figure 1 in that the star point in the secondary winding is no longer grounded, in contrast to Figure 1. Instead, a zero system filter 21 is provided, the phases of which are connected to each other to form a filter star point 22. The filter star point 22 is grounded. Therefore, in the TCFi mode, the zero system can flow from the TCB star point 18 to the filter star point 22 via ground, with the zero system filter 21 forming a current path with a low impedance for the third harmonic of the current, thus attenuating the load caused by the zero system. A plurality of zero system filters 21 can of course also be provided within the scope of the invention, which are tuned for 534 BO3 other harmonics, for example the ninth harmonic. It is essential that all zero system filters have a grounded star point or a star point which is metallically connected to the star point on the TCR, which results in the device according to the invention providing a closed circuit which has a low impedance for zero system currents.
    权利要求:
    Claims (6)
    [1]
    A device (1) for flexible power transmission and de-icing of a high-voltage line, which has a plurality of phases by means of direct current with an alternating voltage connection of the high-voltage line, which has a number of phases corresponding to the number of phases on the high-voltage line, each phase comprises at least one inductor (6) and a valve circuit (10) connected in series with each inductor (6), the valve circuit (10) being connected through a connection point (11) to the AC voltage connection and having a first current path (14) with a first power semiconductor valve (12) and a second current path (15) with a second power semiconductor valve (13), the power semiconductor valves (12, 13) being connected opposite to each other relative to the connection point (11) and wherein the first and the second current path (15) can be connected to a TCR star point by at least one star point switch (16, 17), characterized in that the TCR star point (18) is connected via earth to a star point of a zero system attenuation means (2, 21) wherein said zero system attenuation means (2, 21) comprises a transformer which has a primary winding connected in delta.
    [2]
    Device (1) according to claim 1, characterized in that said transformer has a secondary winding (4) connected to a grounded star.
    [3]
    Device (1) according to any one of the preceding claims, characterized in that the zero system damping means comprises at least one filter (21) with a grounded star point.
    [4]
    Device (1) according to one of the preceding claims, characterized in that a number of inductances (6, 7) are provided in each phase, one of the inductances (7) of which can be bridged by a bridging switch (8).
    [5]
    Device (1) according to one of the preceding claims, characterized in that the first current path (14) and / or the second current path (15) has a compensating inductor. 534 503
    [6]
    Device (1) according to one of the preceding claims, characterized by means for filtering the fifth, seventh and / or twelfth harmonic harmonics (19).
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    同族专利:
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    法律状态:
    2018-07-03| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    DE102006055575.9A|DE102006055575B4|2006-11-21|2006-11-21|Device for flexible energy transmission and for deicing a high voltage line by means of direct current|
    PCT/EP2007/062324|WO2008061924A2|2006-11-21|2007-11-14|Device for flexible power transmission and deicing of a high-voltage power line by means of direct current|
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