CN110943636B - Multi-level module for eliminating direct current short-circuit current - Google Patents
Multi-level module for eliminating direct current short-circuit current Download PDFInfo
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- CN110943636B CN110943636B CN201911167719.3A CN201911167719A CN110943636B CN 110943636 B CN110943636 B CN 110943636B CN 201911167719 A CN201911167719 A CN 201911167719A CN 110943636 B CN110943636 B CN 110943636B
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a multi-level module for clearing direct current short-circuit current, which comprises: the switching device comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth diode, a first capacitor, a second capacitor and a third capacitor; the emitter of the first switching tube is connected with the collector of the second switching tube, the collector of the first switching tube is connected with the positive electrode of the first capacitor, the emitter of the second switching tube is connected with the emitter of the third switching tube and is connected with the negative electrode of the sixth diode, the collector of the third switching tube is connected with the negative electrode of the first capacitor, is connected with the positive electrode of the second capacitor and is connected with the collector of the fourth switching tube, the emitter of the fourth switching tube is connected with the collector of the fifth switching tube, the emitter of the fifth switching tube is connected with the positive electrode of the sixth diode and is connected with the negative electrode of the third capacitor, and the positive electrode of the third capacitor is connected with the negative electrode of the second capacitor.
Description
Technical Field
The invention belongs to the technical field of high-voltage direct-current transmission, and particularly relates to a multi-level module for removing direct-current short-circuit current.
Background
With the rapid development of modern power electronics technology, high voltage direct current transmission (High Voltage Direct Current, HVDC) systems based on modular multilevel converters (Module Multilevel Converter, MMC) have grown and have received widespread attention from society.
The MMC adopts a modularized topological structure, has a series of advantages of simple structure, easy expansion, low harmonic content, low loss and the like, and has great application prospect in the occasions of renewable energy grid connection, urban power grid power supply, asynchronous alternating current power grid interconnection and the like.
Aiming at flexible high-voltage direct-current power transmission in overhead line occasions, after a direct-current side interelectrode short-circuit fault occurs, the fault causes great harm to a system and develops rapidly, however, the technology about direct-current fault current clearing is not perfect, the research on a high-voltage high-capacity direct-current breaker is not mature, and in order to solve the problem that the traditional half-bridge MMC does not have the capability of clearing direct-current short-circuit current, a bidirectional anti-parallel thyristor valve pipe module, a full-bridge submodule and a hybrid submodule are mainly proposed at present. After the direct current fault occurs, the bi-directional anti-parallel thyristor sub-module structure simultaneously conducts the bi-directional anti-parallel thyristor through the IGBT in the locking sub-module to convert the direct current short circuit into the alternating current short circuit, and protects the flywheel diode, thereby realizing the natural attenuation of the fault current at the direct current side. However, due to different actual circuit parameters, the phenomenon of slow attenuation of fault current is easy to occur, and the self-cleaning effect of the fault current is not ideal. The full-bridge submodule structure can effectively inhibit short-circuit current, but the number of used devices is twice that of the traditional half-bridge submodule structure, and the economic benefit is poor. The hybrid submodule further reduces the number of power devices, but compared with the half-bridge submodule, the hybrid submodule still has a large number of devices, and the reverse electromotive force provided during fault locking is small, so that the rapid clearing of fault current is not facilitated. This is a disadvantage of the prior art.
In view of the foregoing, it is desirable to provide a multi-level module for removing dc short-circuit current to solve the drawbacks of the prior art.
Disclosure of Invention
The invention aims to provide a multi-level module for eliminating direct current short-circuit current, which aims to solve the technical problems.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a multi-level module for clearing dc short-circuit current, comprising:
the switching device comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth diode, a first capacitor, a second capacitor and a third capacitor;
each switch tube comprises an IGBT tube and an anti-parallel diode, the emitter of the IGBT tube is electrically connected with the anode of the anti-parallel diode, the collector of the IGBT tube is electrically connected with the cathode of the anti-parallel diode,
the emitter of the first switching tube is connected with the collector of the second switching tube, the collector of the first switching tube is connected with the positive electrode of the first capacitor, the emitter of the second switching tube is connected with the emitter of the third switching tube and is connected with the negative electrode of the sixth diode, the collector of the third switching tube is connected with the negative electrode of the first capacitor, is connected with the positive electrode of the second capacitor and is connected with the collector of the fourth switching tube, the emitter of the fourth switching tube is connected with the collector of the fifth switching tube, the emitter of the fifth switching tube is connected with the positive electrode of the sixth diode and is connected with the negative electrode of the third capacitor, and the positive electrode of the third capacitor is connected with the negative electrode of the second capacitor.
The collector of the IGBT tube is the collector of the corresponding switch tube, and the emitter of the IGBT tube is the emitter of the corresponding switch tube.
Preferably, the emitter of the first switching tube is used as the positive electrode of the output end of the module, and the emitter of the fourth switching tube is used as the negative electrode of the output end of the module; the output voltage is U out Reference direction of input current and output voltage U out Is the same as the reference direction of (a); the circuit structure of the module is effectively utilized to remove fault current.
Preferably, U C1 ＝U C2 ＝U C3 =electricCapacity voltage rating U cref 。
Preferably, when the converter is in normal operation and uout=0, the second switching tube, the third switching tube and the fourth switching tube are in an on state, the first switching tube and the fifth switching tube are in an off state, and the first capacitor, the second capacitor and the third capacitor are bypassed;
when uout=ucref, the first switching tube and the fourth switching tube are in an on state, the second switching tube, the third switching tube and the fifth switching tube are in an off state, the second capacitor and the third capacitor are bypassed, and the first capacitor is put into operation;
when uout=2ucref, the second switching tube, the third switching tube and the fifth switching tube are in an on state, the first switching tube and the fourth switching tube are in an off state, at the moment, the first capacitor is bypassed, and the second capacitor and the third capacitor are put into operation;
when uout=3uicref, the first switching tube and the fifth switching tube are in an on state, the second switching tube, the third switching tube and the fourth switching tube are in an off state, and the first capacitor, the second capacitor and the third capacitor are put into operation.
Preferably, when a direct current short circuit fault occurs in the system, all the switching tubes are blocked, when bridge arm current is positive, the bridge arm current flows through the anti-parallel diodes D1 and D5, at the moment, the first capacitor, the second capacitor and the third capacitor are put into charge, the bridge arm current rapidly decays to zero, when the bridge arm current is negative, the bridge arm current flows through the anti-parallel diode D4 and the diode D6, at the moment, the second capacitor and the third capacitor are put into charge, the multi-level submodule externally provides reverse capacitor voltage 2Ucref, and the bridge arm current charges the second capacitor and the third capacitor and rapidly decays to zero.
Thereby realizing the function of balancing the capacitance voltage of each sub-module.
The invention has the beneficial effects that under the condition that the output level numbers are the same, compared with the Quan Qiaozi module, the hybrid sub-module, the cross-connection sub-module and the diode embedded sub-module, fewer switching devices are used, and the initial manufacturing cost of the equipment is greatly reduced. Under the condition that the output level numbers are the same, compared with the cross-connection type submodule and the hybrid type submodule, the invention can provide higher reverse capacitor voltage for the bridge arm after the fault current converter is locked, thereby achieving the purpose of rapidly clearing fault current.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
It can be seen that the present invention has outstanding substantial features and significant advances over the prior art, as well as its practical advantages.
Drawings
Fig. 1 is a topology structure diagram of a multi-level module for clearing dc short-circuit current according to the present invention.
Fig. 2-5 are schematic diagrams of current paths of the multi-level module under normal operation.
Fig. 6-7 are schematic diagrams of multi-level module current paths in the event of a fault.
1-first switching tube, 2-second switching tube, 3-third switching tube, 4-fourth switching tube, 5-fifth switching tube, T1-IGBT tube of first switching tube, D1-anti-parallel diode of first switching tube, T2-IGBT tube of second switching tube, D2-anti-parallel diode of second switching tube, T3-IGBT tube of third switching tube, D3-anti-parallel diode of third switching tube, T4-IGBT tube of fourth switching tube, D4-anti-parallel diode of fourth switching tube, T5-IGBT tube of fifth switching tube, D5-anti-parallel diode of fifth switching tube, 6-sixth diode, 7-first capacitor, 8-second capacitor, and 9-third capacitor.
Detailed Description
The present invention will be described in detail below by way of specific examples with reference to the accompanying drawings, the following examples being illustrative of the present invention and the present invention is not limited to the following embodiments.
As shown in fig. 1 to 7, a multi-level module for clearing dc short-circuit current provided in this embodiment includes:
the switching device comprises a first switching tube 1, a second switching tube 2, a third switching tube 3, a fourth switching tube 4, a fifth switching tube 5, a sixth diode 6, a first capacitor 7, a second capacitor 8 and a third capacitor 9;
each switch tube comprises an IGBT tube and an anti-parallel diode, the emitter of the IGBT tube is electrically connected with the anode of the anti-parallel diode, the collector of the IGBT tube is electrically connected with the cathode of the anti-parallel diode,
the emitter of the first switching tube 1 is connected with the collector of the second switching tube 2, the collector of the first switching tube 1 is connected with the positive electrode of the first capacitor 7, the emitter of the second switching tube 2 is connected with the emitter of the third switching tube 3 and is connected with the negative electrode of the sixth capacitor 6, the collector of the third switching tube 3 is connected with the negative electrode of the first capacitor 7, is connected with the positive electrode of the second capacitor 8 and is connected with the collector of the fourth switching tube 4, the emitter of the fourth switching tube 4 is connected with the collector of the fifth switching tube 5, the emitter of the fifth switching tube 5 is connected with the positive electrode of the sixth diode 6 and is connected with the negative electrode of the third capacitor 9, and the positive electrode of the third capacitor 9 is connected with the negative electrode of the second capacitor 8. As shown in fig. 1.
The collector of the IGBT tube is the collector of the corresponding switch tube, and the emitter of the IGBT tube is the emitter of the corresponding switch tube.
In this embodiment, the emitter of the first switching tube 1 is used as the positive electrode of the output end of the module, and the emitter of the fourth switching tube 4 is used as the negative electrode of the output end of the module; the output voltage is U out Reference direction of input current and output voltage U out Is the same as the reference direction of (a); the circuit structure of the module is effectively utilized to remove fault current.
In this embodiment, U C1 ＝U C2 ＝U C3 =capacitor voltage rating U cref 。
In this embodiment, when the converter is in normal operation and uout=0, the second switching tube 2, the third switching tube 3 and the fourth switching tube 4 are in on state, the first switching tube 1 and the fifth switching tube 5 are in off state, and the first capacitor 7, the second capacitor 8 and the third capacitor 9 are bypassed; as shown in fig. 2.
When uout=ucref, the first switching tube 1 and the fourth switching tube 4 are in an on state, the second switching tube 2, the third switching tube 3 and the fifth switching tube 5 are in an off state, at this time, the second capacitor 8 and the third capacitor 9 are bypassed, and the first capacitor 7 is put into operation; as shown in fig. 3.
When uout=2ucref, the second switching tube 2, the third switching tube 3 and the fifth switching tube 5 are in an on state, the first switching tube 1 and the fourth switching tube 4 are in an off state, at this time, the first capacitor 7 is bypassed, and the second capacitor 8 and the third capacitor 9 are put in; as shown in fig. 4.
When uout=3uicref, the first switching tube 1 and the fifth switching tube 5 are in an on state, the second switching tube 2, the third switching tube 3 and the fourth switching tube 4 are in an off state, and the first capacitor 7, the second capacitor 8 and the third capacitor 9 are put into operation; as shown in fig. 5.
In this embodiment, when a dc short circuit fault occurs in the system, all the switching tubes are blocked, and when the bridge arm current is positive, as shown in fig. 6, the bridge arm current flows through the anti-parallel diodes D1 and D5, at this time, the first capacitor 7, the second capacitor 8 and the third capacitor 9 are put into charge, and the bridge arm current charges the first capacitor 7, the second capacitor 8 and the third capacitor 9 and rapidly decays to zero; when the bridge arm current is negative, as shown in fig. 7, the bridge arm current flows through the anti-parallel diode D4 and the diode D6, and at this time, the second capacitor and the third capacitor are put in, the multi-level submodule provides the reverse capacitor voltage 2Ucref to the outside, and the bridge arm current charges the second capacitor 8 and the third capacitor 9 and rapidly decays to zero.
It can be seen from table 1 that, under the condition of having the self-clearing capability of the direct current short-circuit current and the same output level number, compared with the Quan Qiaozi module, the hybrid sub-module, the cross-connection sub-module and the diode embedded double sub-module, the invention uses fewer switching devices, greatly reduces the initial manufacturing cost of equipment, and meanwhile, compared with the hybrid sub-module and the cross-connection sub-module, the invention can provide higher reverse capacitor voltage for a bridge arm after the fault current is blocked, thereby achieving the purpose of rapidly clearing the fault current.
TABLE 1 number of switching tubes for each type of sub-module at unit level and reverse capacitor voltage provided in case of failure
The foregoing disclosure is merely illustrative of the preferred embodiments of the invention and the invention is not limited thereto, since modifications and variations may be made by those skilled in the art without departing from the principles of the invention.
Claims (4)
1. A multi-level module for clearing dc short-circuit current, comprising:
the switching device comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth diode, a first capacitor, a second capacitor and a third capacitor;
each switch tube comprises an IGBT tube and an anti-parallel diode, the emitter of the IGBT tube is electrically connected with the anode of the anti-parallel diode, the collector of the IGBT tube is electrically connected with the cathode of the anti-parallel diode,
the emitter of the first switching tube is connected with the collector of the second switching tube, the collector of the first switching tube is connected with the positive electrode of the first capacitor, the emitter of the second switching tube is connected with the emitter of the third switching tube and is connected with the negative electrode of the sixth diode, the collector of the third switching tube is connected with the negative electrode of the first capacitor, is connected with the positive electrode of the second capacitor and is connected with the collector of the fourth switching tube, the emitter of the fourth switching tube is connected with the collector of the fifth switching tube, the emitter of the fifth switching tube is connected with the positive electrode of the sixth diode and is connected with the negative electrode of the third capacitor, and the positive electrode of the third capacitor is connected with the negative electrode of the second capacitor;
the emitter of the first switching tube is used as the positive electrode of the output end of the module, and the emitter of the fourth switching tube is used as the negative electrode of the output end of the module; the output voltage is U out Reference direction of input currentAnd output voltage U out Is the same as the reference direction of (a).
2. The multi-level module for clearing dc short circuit current according to claim 1, wherein U C1 ＝U C2 ＝U C3 =capacitor voltage rating U cref；
U C1 Representing the rated voltage value of the first capacitor; u (U) C2 Representing the rated voltage value of the second capacitor; u (U) C3 Representing the voltage rating of the third capacitor.
3. The multi-level module for clearing dc short-circuit current according to claim 2, wherein when the converter is in normal operation, when uout=0, the second switching tube, the third switching tube and the fourth switching tube are in on state, the first switching tube and the fifth switching tube are in off state, and the first capacitor, the second capacitor and the third capacitor are bypassed;
when uout=ucref, the first switching tube and the fourth switching tube are in an on state, the second switching tube, the third switching tube and the fifth switching tube are in an off state, the second capacitor and the third capacitor are bypassed, and the first capacitor is put into operation;
when uout=2ucref, the second switching tube, the third switching tube and the fifth switching tube are in an on state, the first switching tube and the fourth switching tube are in an off state, at the moment, the first capacitor is bypassed, and the second capacitor and the third capacitor are put into operation;
when uout=3uicref, the first switching tube and the fifth switching tube are in an on state, the second switching tube, the third switching tube and the fourth switching tube are in an off state, and the first capacitor, the second capacitor and the third capacitor are put into operation.
4. The multi-level module for clearing dc short-circuit current according to claim 2, wherein when a dc short-circuit fault occurs in the system, all the switching tubes are blocked, when a bridge arm current is positive, the bridge arm current flows through an anti-parallel diode D1 of the first switching tube and an anti-parallel diode D5 of the fifth switching tube, the first capacitor, the second capacitor and the third capacitor are charged at this time, the bridge arm current charges the first capacitor, the second capacitor and the third capacitor and decays to zero rapidly, when the bridge arm current is negative, the bridge arm current flows through an anti-parallel diode D4 of the fourth switching tube and a sixth diode, the second capacitor and the third capacitor are charged at this time, and the multi-level submodule externally provides a reverse capacitor voltage 2Ucref, and the bridge arm current charges the second capacitor and the third capacitor and decays to zero rapidly.
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