CN108768184B - Switch power unit and high-voltage direct-current circuit breaker - Google Patents
Switch power unit and high-voltage direct-current circuit breaker Download PDFInfo
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- 238000010521 absorption reaction Methods 0.000 claims description 11
- 238000005265 energy consumption Methods 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 238000002788 crimping Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 241000512005 Alstonia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to a switch power unit and a high-voltage direct-current circuit breaker, wherein the switch power unit comprises a forward power module and a reverse power module which are connected in series; the power module is an H-bridge module and comprises a first bridge arm, a second bridge arm and a full-control device branch, wherein the first bridge arm, the second bridge arm and the full-control device branch are connected in parallel, the first bridge arm and the second bridge arm are formed by connecting two non-control device valve sets in series in the same direction, a full-control device is arranged in the full-control device branch, the series connection point of the two non-control device valve sets of the first bridge arm is the input/output end of the power module, and the series connection point of the two non-control device valve sets of the second bridge arm is; the setting directions of the uncontrollable component valve groups in the two power modules are opposite, and the setting directions of the full-control components are opposite. According to the invention, the two power modules are in a positive and negative series connection mode, so that the length of a current route is effectively reduced, the stray inductance of a branch is reduced, the loss of a power device is further reduced, and the reliability of the valve bank is improved.
Description
Technical Field
The invention relates to a switch power unit and a high-voltage direct-current circuit breaker, and belongs to the technical field of high-voltage direct-current circuit breakers.
Background
In recent years, a multi-terminal direct current system is rapidly developed, and a direct current transmission network based on flexible direct current transmission becomes one of hot spots in the international power field at present due to good characteristics of the direct current transmission network, and the direct current transmission network will also be an important component of the construction of a future power grid. The direct current circuit breaker with the capability of switching on and off large current within several milliseconds can rapidly cut off faulty equipment or lines, can ensure the stable operation of the non-faulty part of a direct current system, and greatly improves the reliability of the system. The engineering application of the method marks that the high-end direct-current equipment technology in China realizes a major breakthrough, greatly promotes the direct-current transmission construction and the direct-current power grid construction in China, and plays an important role in the safe and reliable operation of a power transmission system and a power grid.
In 2012, hybrid high-voltage direct-current circuit breakers of ABBs were successfully developed. The hybrid high-voltage direct-current circuit breaker mainly comprises a mechanical switch branch (a rapid mechanical isolating switch and a load change-over switch) and a semiconductor switch branch (a semiconductor circuit breaker and a lightning arrester group). In 2014, alstonia completed its prototype product for hybrid high voltage dc circuit breakers. The hybrid high-voltage direct-current circuit breaker mainly comprises a bypass switch (UFD + PES), a semiconductor switch branch 1 (thyristor + arrester), a semiconductor switch branch 2 (thyristor + capacitor) and an arrester group.
The high-voltage direct-current circuit breakers developed at home and abroad at present need to comprise semiconductor switch branches, the switching speed of the semiconductor switch branches is microsecond or even nanosecond, and the change rate of the withstand current and the voltage in the dynamic process of the component reaches several kA/us and kV/us. The IGBT module is arranged in the semiconductor switch branch in series, the common structure of the existing IGBT module comprises a half-bridge structure and a full-bridge structure, wherein the half-bridge structure is formed by reversely connecting two IGBTs in series, the current is switched on and switched off by diodes which are connected with the forward IGBT and the reverse IGBT in parallel, the full-bridge structure is formed by four IGBTs and diodes which are connected in parallel, the number of devices is twice that of the diodes which are connected in series in reverse, and the current switching-off capacity is also twice that of the diodes. The two modes use a large number of IGBTs, have high cost and large valve string volume.
In addition, because the IGBT valves are formed by connecting a plurality of IGBT modules in series and are arranged in a plurality of layers, for example, a 160kV high-voltage direct-current circuit breaker is taken as an example, the total number of 108 modules is arranged in series in three layers, and 36 modules need to be connected in series in a single layer; the number of single-layer valve strings should be even, depending on the symmetry requirements of the arrangement. And because the length of the crimping type IGBT string should not exceed 2 meters, the number of the single-layer valve strings is at least 4, and each valve string should be formed by connecting 9 modules in series. Each layer comprises 4 series valve strings, 2 are symmetrically distributed on the left and the right, and 9 modules are arranged in series. According to the traditional IGBT series connection mode, two modules are connected in series in a one-way mode, namely the installation polarities of the first module and the second module are connected in series in the same direction. In this way, the series current path is longer, and the branch circuit has larger stray inductance. The large stray inductance in the IGBT series branch can cause the large surge current of the IGBT, the high peak voltage and the oscillation of the top of the pulse, the main circuit and the driving circuit are affected, the loss of a power device is increased, and the IGBT can be damaged in serious conditions. Therefore, reducing the parasitic inductance in the IGBT series branch is a problem to be solved in the main circuit design.
For example, chinese patent publication No. CN107124167A discloses a dc electronic switch and a switching power module thereof, where the switching power module is composed of a full-control device and a sub-module unit with 4 rectifier diodes as bridge arms, and fig. 1 shows a schematic structural diagram of two switching power modules connected in series. The switching power module can reduce the manufacturing cost and reserve the capability of cutting off the current in two directions. However, when a plurality of such switching power modules are connected in series and pressure-bonded, there are problems such as a long current flow path and a large branch noise.
In addition, the number of semiconductor assemblies is increased sharply along with the improvement of the voltage level, the series-parallel connection of a plurality of power devices, the difference of the performance of the devices, the influence of the parasitic parameters of the main loop and the design difficulty of the branch circuits of the semiconductor assembly units are increased, the consistency of the parameters of the semiconductor assemblies and the loop and the design difficulty of the damping loop are increased, and great challenges are brought to the development of the direct current circuit breaker.
Disclosure of Invention
The invention aims to provide a switching power unit and a high-voltage direct-current circuit breaker, which are used for solving the problems of long current through-flow path and large branch circuit impurity when the existing switching power module is connected in series and connected in a single direction in a crimping mode.
In order to solve the above technical problem, the present invention provides a switching power unit, including a forward power module and a reverse power module connected in series; the power module is an H-bridge module and comprises a first bridge arm, a second bridge arm and a full-control device branch which are connected in parallel, the first bridge arm is formed by connecting two non-control device valve sets in series in the same direction, the second bridge arm is formed by connecting the other two non-control device valve sets in series in the same direction, a full-control device is arranged in the full-control device branch, the serial connection point of the two non-control device valve sets of the first bridge arm is the input/output end of the power module, and the serial connection point of the two non-control device valve sets of the second bridge arm is the output/input end of the power module; the setting directions of the uncontrollable component valve group in the forward power module and the uncontrollable component valve group in the reverse power module are opposite, and the setting directions of the full-control device in the forward power module and the full-control device in the reverse power module are opposite.
The invention has the beneficial effects that: through adopting the form of positive and negative series connection crimping with two power modules, effectively reduced current route length, reduced branch road stray inductance, and then reduced the power device loss, increased the valves reliability.
Further, in order to eliminate overvoltage and overcurrent generated in the power module when the full control device is turned off, an RC absorption branch is connected between the series point in the same direction of the two non-control device valve sets in the first bridge arm and the series point in the same direction of the two non-control device valve sets in the second bridge arm.
Further, the uncontrolled component valve set is composed of one or at least two diodes connected in series in the same direction, and the full control device branch is composed of one or at least two full control devices connected in series/parallel in the same direction.
Further, the full control device is an IGBT.
Further, the RC absorption branch is connected with a lightning arrester in parallel.
The invention also provides a high-voltage direct-current circuit breaker, which comprises a main branch, a transfer branch and an energy consumption branch which are connected in parallel, wherein a switching power unit is arranged in the main branch and/or the transfer branch in series, and the switching power unit comprises a forward power module and a reverse power module which are connected in series; the power module is an H-bridge module and comprises a first bridge arm, a second bridge arm and a full-control device branch which are connected in parallel, the first bridge arm is formed by connecting two non-control device valve sets in series in the same direction, the second bridge arm is formed by connecting the other two non-control device valve sets in series in the same direction, a full-control device is arranged in the full-control device branch, the serial connection point of the two non-control device valve sets of the first bridge arm is the input/output end of the power module, and the serial connection point of the two non-control device valve sets of the second bridge arm is the output/input end of the power module; the setting directions of the uncontrollable component valve group in the forward power module and the uncontrollable component valve group in the reverse power module are opposite, and the setting directions of the full-control device in the forward power module and the full-control device in the reverse power module are opposite.
Further, an RC absorption branch is connected between the equidirectional series points of the two non-controlled component valve groups in the first bridge arm and the equidirectional series points of the two non-controlled component valve groups in the second bridge arm.
Further, the uncontrolled component valve set is composed of one or at least two diodes connected in series in the same direction, and the full control device branch is composed of one or at least two full control devices connected in series/parallel in the same direction.
Further, the full control device is an IGBT.
Further, the RC absorption branch is connected with a lightning arrester in parallel.
Drawings
Fig. 1 is a schematic diagram of a prior art structure in which two switching power modules are connected in series;
fig. 2 is a schematic structural diagram of a high voltage dc circuit breaker;
FIG. 3 is a schematic diagram of the structure of the switching power unit of the present invention;
FIG. 4 is a schematic of the topology of a power module employed in the present invention;
FIG. 5 is a schematic of a topology of switching power cells in a unidirectional series;
FIG. 6 is a graph of simulation results when multiple switching power cells of the present invention are connected in series;
fig. 7 is a diagram showing simulation results obtained when a plurality of switching power cells in a unidirectional series connection are connected in series.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides a high-voltage direct-current circuit breaker, which is shown in a schematic structural diagram of fig. 2 and comprises a main branch, a transfer branch and an energy consumption branch which are connected in parallel, wherein a plurality of switching power units are arranged in the main branch and the transfer branch in series, the schematic structural diagram of the switching power units is shown in fig. 3, and one or more lightning arresters or other energy consumption devices are arranged in the energy consumption branch.
As shown in fig. 3, the switching power unit of the present invention includes a forward power module and a reverse power module connected in series, that is, connected in series in a manner that installation polarities of the two power modules are opposite. The specific structures of the forward power module and the reverse power module are completely the same, and only the setting directions are opposite. Under the condition that the setting direction of the power device is not considered, each power module is an H-bridge module and comprises a first bridge arm, a second bridge arm and a full-control device branch which are connected in parallel, the first bridge arm is formed by connecting two non-control device valve sets in series in the same direction, the second bridge arm is formed by connecting the other two non-control device valve sets in series in the same direction, a full-control device is arranged in the full-control device branch, the series connection point of the two non-control device valve sets of the first bridge arm is the input/output end of the power module, and the series connection point of the two non-control device valve sets of the second bridge arm is the output/input end of the power module. In addition, an RC absorption branch is connected between the equidirectional series points of the two non-controlled component valve groups in the first bridge arm and the equidirectional series points of the two non-controlled component valve groups in the second bridge arm, and the RC absorption branch is connected with a lightning arrester in parallel.
Specifically, in this embodiment, as shown in fig. 4, each uncontrolled component valve set in each bridge arm of the power module is composed of one diode, and each fully controlled component branch is composed of one fully controlled component IGBT. At the moment, each power module consists of one IGBT and four diodes, the number of the IGBTs under the same turn-off capability is less than that of an anti-series structure and a full-bridge structure, and although the four diodes are added, the cost of the diodes is far lower than that of the IGBTs. The diode bridge type switching power unit is connected in series and arranged in the power electronic series valve bank, on the basis of meeting the bidirectional current switching-on and switching-off function, the maximum current of the direct current circuit breaker can be cut off without parallel connection, the number of full-control devices is greatly reduced, the device utilization rate is improved, the cost is greatly reduced, and the diode bridge type switching power unit has obvious advantages.
In the forward power module, the uncontrolled component valve groups in the two bridge arms and the full control components in the full control component branch are arranged in the forward direction; in the reverse power modules, the uncontrollable component valve groups in the two bridge arms and the full-control devices in the full-control device branches are both reversely arranged, the forward arrangement and the reverse arrangement are opposite, and it is required to ensure that the uncontrollable component valve groups in the two power modules are opposite in arrangement direction and the full-control devices in the two power modules are opposite in arrangement direction. As shown in fig. 3, that is, when the conduction direction of the upper arm diode D1 in the first arm in the forward power module is from left to right and the conduction direction of the lower arm diode D2 is from right to left, the conduction direction of the upper arm diode D3 in the second arm is from right to left and the conduction direction of the lower arm diode D4 is from left to right, the conduction direction of the fully-controlled device IGBT 1 is from top to bottom; at this time, the conduction direction of the upper arm diode D5 in the first arm in the reverse power module is from right to left, the conduction direction of the lower arm diode D6 is from left to right, the conduction direction of the upper arm diode D7 in the second arm is from left to right, the conduction direction of the lower arm diode D8 is from right to left, and the conduction direction of the full-control device IGBT 2 is from bottom to top. In addition, when the conduction direction of the upper arm diode D1 in the first arm in the forward power module is from right to left and the conduction direction of the lower arm diode D2 is from left to right, the conduction direction of the upper arm diode D3 in the second arm is from left to right and the conduction direction of the lower arm diode D4 is from right to left, the conduction direction of the full-control device IGBT 1 is from bottom to top; at this time, the conduction direction of the upper arm diode D5 in the first arm in the reverse power module is from left to right, the conduction direction of the lower arm diode D6 in the first arm is from right to left, the conduction direction of the upper arm diode D7 in the second arm is from right to left, the conduction direction of the lower arm diode D8 is from left to right, and the conduction direction of the full-control device IGBT 2 is from top to bottom.
It should be noted that, as another embodiment, the uncontrolled component valve set in the power module bridge arm may also be composed of a plurality of diodes connected in series in the same direction, and the fully controlled component branch is composed of a plurality of IGBTs connected in series/parallel in the same direction or other fully controlled components. And a resistor and a capacitor are connected in series in the RC absorption branch, and a diode can be connected in parallel at two ends of the resistor as required. The specific structures of the forward power module and the reverse power module may not be completely the same, and each power module may adopt the structure specifically shown in fig. 4, or may adopt other structural forms in the prior art, but it is necessary to ensure that the two power modules adopt a form of positive and negative series connection by crimping. In addition, it is possible to select to serially connect the above-mentioned switching power unit in the main branch or the transfer branch, and to serially connect other switching power units in the prior art in the other branch.
Fig. 5 shows a topological schematic diagram when two power modules are connected in series in a unidirectional manner, and it can be known from a comparison between the current through-flow paths in fig. 3 and 5 that the switching power unit of the present invention can effectively reduce the length of the current path and reduce the stray inductance of the branch circuit by installing the two power modules in series in a manner of opposite polarities.
In order to verify the effectiveness of the switching power unit, a workbench and a comsol are adopted to respectively simulate the distribution conditions of stray inductances in two wiring modes of adopting a forward and reverse direction series switching power unit in fig. 3 and adopting a unidirectional series switching power unit in fig. 5, and simulation results are respectively shown in fig. 6 and fig. 7. As can be seen from fig. 6 and 7, the forward-reverse series connection mode is about one third smaller than the unidirectional series connection line inductance, so that the forward-reverse series connection mode can reduce the power device loss, reduce the voltage impact generated when the stray inductance turns off the IGBT and the diode, and increase the reliability of the valve set.
The invention adopts a forward and reverse series connection mode of the two power modules, solves the problems of excessive valve string layers, parallel connection and the like of the existing power electronic equipment such as a high-voltage direct-current breaker and the like, and also effectively solves the problems of large loss and easy damage of devices caused by large miscellaneous inductance caused by the large number of the valve string layers and long current path. The method can greatly save the cost of the direct current circuit breaker or the power electronic equipment, and provides a high-efficiency, simple and convenient connection mode for improving the reliability of the power electronic valve string.
Claims (6)
1. A switching power unit comprising a forward power module and a reverse power module connected in series; the power module is an H-bridge module and comprises a first bridge arm, a second bridge arm and a full-control device branch which are connected in parallel, the first bridge arm is formed by connecting two non-control device valve sets in series in the same direction, the second bridge arm is formed by connecting the other two non-control device valve sets in series in the same direction, a full-control device is arranged in the full-control device branch, the serial connection point of the two non-control device valve sets of the first bridge arm is the input/output end of the power module, and the serial connection point of the two non-control device valve sets of the second bridge arm is the output/input end of the power module; the setting directions of the uncontrollable component valve group in the forward power module and the uncontrollable component valve group in the reverse power module are opposite, and the setting directions of the full-control device in the forward power module and the full-control device in the reverse power module are opposite; the output/input end of the forward power module is connected with the input/output end of the reverse power module;
the uncontrolled component valve is a diode, the first bridge arm of the forward power module comprises a first diode of an upper bridge arm and a second diode of a lower bridge arm, and the second bridge arm of the forward power module comprises a third diode of the upper bridge arm and a fourth diode of the lower bridge arm; the first bridge arm of the reverse power module comprises a fifth diode of the upper bridge arm and a sixth diode of the lower bridge arm, and the second bridge arm of the reverse power module comprises a seventh diode of the upper bridge arm and an eighth diode of the lower bridge arm;
a connecting line of a third diode and a fourth diode in a second bridge arm of the forward power module is shared with a connecting line of a fifth diode and a sixth diode in a first bridge arm of the reverse power module;
the anode of a first diode and the cathode of a second diode in the forward power module are connected with the output/input end of the forward power module, the anode of a third diode is connected with the cathode of a fifth diode of the reverse power module, the cathode of a fourth diode is connected with a sixth diode, and the cathode of a seventh diode and the anode of an eighth diode which are connected in series in the same direction are connected with the input/output end of the reverse power module;
the full-control device is an IGBT, wherein a collector of the full-control device of the forward power module is connected with cathodes of the first diode and the third diode, and an emitter of the full-control device is connected with anodes of the second diode and the fourth diode; and the emitter of the full control device of the reverse power module is connected with the anodes of the fifth diode and the seventh diode, and the collector of the full control device is connected with the anodes of the sixth diode and the eighth diode.
2. The switching power unit of claim 1, wherein an RC absorption branch is connected between the series point of the two sets of non-controlled components in the first leg and the series point of the two sets of non-controlled components in the second leg.
3. The switching power unit according to claim 2, wherein the RC absorption branch is connected in parallel with a surge arrester.
4. A high-voltage direct-current circuit breaker comprises a main branch, a transfer branch and an energy consumption branch which are connected in parallel, and is characterized in that a switching power unit is arranged in the main branch and/or the transfer branch in series, and the switching power unit comprises a forward power module and a reverse power module which are connected in series; the power module is an H-bridge module and comprises a first bridge arm, a second bridge arm and a full-control device branch which are connected in parallel, the first bridge arm is formed by connecting two non-control device valve sets in series in the same direction, the second bridge arm is formed by connecting the other two non-control device valve sets in series in the same direction, a full-control device is arranged in the full-control device branch, the serial connection point of the two non-control device valve sets of the first bridge arm is the input/output end of the power module, and the serial connection point of the two non-control device valve sets of the second bridge arm is the output/input end of the power module; the setting directions of an uncontrolled component valve group in a forward power module and an uncontrolled component valve group in a reverse power module are opposite, the setting directions of a full control device in the forward power module and a full control device in the reverse power module are opposite, and the output/input end of the forward power module is connected with the input/output end of the reverse power module;
the uncontrolled component valve is a diode, the first bridge arm of the forward power module comprises a first diode of an upper bridge arm and a second diode of a lower bridge arm, and the second bridge arm of the forward power module comprises a third diode of the upper bridge arm and a fourth diode of the lower bridge arm; the first bridge arm of the reverse power module comprises a fifth diode of the upper bridge arm and a sixth diode of the lower bridge arm, and the second bridge arm of the reverse power module comprises a seventh diode of the upper bridge arm and an eighth diode of the lower bridge arm;
a connecting line of a third diode and a fourth diode in a second bridge arm of the forward power module is shared with a connecting line of a fifth diode and a sixth diode in a first bridge arm of the reverse power module;
the anode of a first diode and the cathode of a second diode in the forward power module are connected with the output/input end of the forward power module, the anode of a third diode is connected with the cathode of a fifth diode of the reverse power module, the cathode of a fourth diode is connected with a sixth diode, and the cathode of a seventh diode and the anode of an eighth diode which are connected in series in the same direction are connected with the input/output end of the reverse power module;
the full-control device is an IGBT, wherein a collector of the full-control device of the forward power module is connected with cathodes of the first diode and the third diode, and an emitter of the full-control device is connected with anodes of the second diode and the fourth diode; and the emitter of the full control device of the reverse power module is connected with the anodes of the fifth diode and the seventh diode, and the collector of the full control device is connected with the anodes of the sixth diode and the eighth diode.
5. The HVDC circuit breaker of claim 4, wherein an RC absorption branch is connected between the series point of the two non-controlled valve assemblies in the first leg and the series point of the two non-controlled valve assemblies in the second leg.
6. The hvdc breaker of claim 5, wherein said RC absorption branch is connected in parallel with a surge arrester.
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| CN201810368462.7A CN108768184B (en) | 2018-04-23 | 2018-04-23 | Switch power unit and high-voltage direct-current circuit breaker |
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| CN201810368462.7A CN108768184B (en) | 2018-04-23 | 2018-04-23 | Switch power unit and high-voltage direct-current circuit breaker |
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| CN108768184B true CN108768184B (en) | 2021-01-22 |
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| CN106230413A (en) * | 2016-08-18 | 2016-12-14 | 平高集团有限公司 | A kind of mixed type high voltage DC breaker and power cell thereof |
| CN106655081A (en) * | 2016-11-30 | 2017-05-10 | 平高集团有限公司 | Direct current circuit breaker and control method therefor |
| CN107846210A (en) * | 2017-10-23 | 2018-03-27 | 许继电气股份有限公司 | A kind of dc circuit breaker branch road component, dc circuit breaker |
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