CN109599883A - A kind of MMC, MMC submodule and MMC submodule bypass protection method - Google Patents
A kind of MMC, MMC submodule and MMC submodule bypass protection method Download PDFInfo
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- CN109599883A CN109599883A CN201811361028.2A CN201811361028A CN109599883A CN 109599883 A CN109599883 A CN 109599883A CN 201811361028 A CN201811361028 A CN 201811361028A CN 109599883 A CN109599883 A CN 109599883A
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- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 12
- 230000001535 kindling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
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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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Abstract
本发明涉及一种MMC、MMC子模块及MMC子模块旁路保护方法。该MMC包括三相六桥臂拓扑结构，各桥臂包括级联设置的至少两个MMC子模块，各MMC子模块中有至少一个MMC子模块包括子模块本体拓扑结构和旁路开关，旁路开关的两端并联设置有双向可控开关，当子模块发生故障时，控制旁路开关闭合，并检测旁路开关是否闭合，如果旁路开关没有闭合，则控制双向可控开关导通，在子模块故障且对应的旁路开关拒动时，控制双向可控开关导通，实现拒动的旁路开关本应该实现的功能，防止了子模块电容过压、IGBT击穿，甚至出现子模块着火的现象，保证了子模块的运行安全，提高了直流输电系统可靠性和稳定性。
The invention relates to an MMC, an MMC sub-module and a bypass protection method for the MMC sub-module. The MMC includes a three-phase six bridge arm topology, each bridge arm includes at least two MMC sub-modules arranged in cascade, and at least one MMC sub-module in each MMC sub-module includes a sub-module body topology and a bypass switch. Two ends of the switch are connected in parallel with a bidirectional controllable switch. When the sub-module fails, the bypass switch is controlled to close, and it is detected whether the bypass switch is closed. If the bypass switch is not closed, the bidirectional controllable switch is controlled to be turned on. When the sub-module fails and the corresponding bypass switch refuses to operate, the bidirectional controllable switch is controlled to be turned on, so as to realize the function that the refusal bypass switch should have realized, and prevent the sub-module capacitor from overvoltage, IGBT breakdown, and even the occurrence of the sub-module. The phenomenon of fire ensures the safe operation of the sub-module and improves the reliability and stability of the DC transmission system.
Description
Technical field
The present invention relates to technical field of direct current power transmission, especially a kind of MMC, MMC submodule and MMC submodule bypass protection
Method.
Background technique
With the development of power electronics technology, the DC transmission system based on modularization multi-level converter (MMC) obtains
It is fast-developing.Modularization multi-level converter includes DC support electricity in each submodule by thousands of sub- module compositions
Appearance, IGBT and its driving and high speed by-pass switch, the control of high speed by-pass switch can be controlled by controller.
When by-pass switch tripping failure occurs in any one submodule, bridge arm forms open circuit where failure submodule, causes
System three-phase bridge arm current imbalance；And bridge arm current can be electric to failure submodule DC support by IGBT anti-paralleled diode
Capacity charge, if when submodule breaks down, control by-pass switch conducting bypasses failure submodule, still, when bypass is opened
When tripping occurs in pass, transmission system does not trip at this time, can quote the over-voltage of submodule capacitor, IGBT breakdown, or even submodule occur
Kindling, such accident occurs in order to prevent, and way generally used now is all submodules of locking, and control system trips, can be serious
Influence the reliable and stable operation of DC transmission system.
Summary of the invention
The object of the present invention is to provide a kind of MMC, MMC submodule and MMC submodule bypass protection methods, existing to solve
Have and carries out protecting influence DC transmission system reliably steady by being latched all submodules when sub-module fault and by-pass switch tripping
Surely the problem of running.
In order to realize that sub-module fault is protected, solve to pass through all submodules of locking when existing submodule by-pass switch tripping
Carry out the problem of protection influences DC transmission system reliable and stable operation.The present invention provides a kind of MMC submodule bypass protection side
Method, comprising the following steps:
(1) when submodule breaks down, corresponding by-pass switch closure is controlled；
(2) detect whether the by-pass switch is closed；
(3) it if the by-pass switch is not closed, controls and two-way is controllably opened with what the by-pass switch was arranged in parallel
Close conducting.
Beneficial effect is, in sub-module fault and corresponding by-pass switch tripping, controls two-way controllable switch conducting, real
The function that the by-pass switch of existing tripping should be realized, it is therefore prevented that the over-voltage of submodule capacitor, IGBT breakdown, or even there is submodule
The phenomenon that kindling, ensure that the operational safety of submodule, improve DC transmission system reliability and stability, meanwhile, in son
When module failure, the submodule of the failure is only bypassed, without being latched all submodules, ensure that DC transmission system reliability
And stability.
Further, in order to preferably guarantee the reliable and stable operation of DC transmission system, guarantee the peace of failure submodule
Entirely, it is latched submodule while submodule breaks down and controls corresponding by-pass switch closure, and/or works as and determines bypass
Switch is latched submodule while closure.
The present invention provides a kind of MMC submodule, including submodule body topological structure and by-pass switch, the by-pass switch
Both ends be arranged in parallel two-way controllable switch, when submodule breaks down, control by-pass switch closure and detects bypass and opens
Close and whether be closed, if the by-pass switch is not closed, control the two-way controllable switch conducting, in sub-module fault and
When corresponding by-pass switch tripping, two-way controllable switch conducting is controlled, realizes the function that the by-pass switch of tripping should be realized,
The over-voltage of submodule capacitor, IGBT breakdown are prevented, or even the phenomenon that submodule kindling occurs, ensure that the operation peace of submodule
Entirely, DC transmission system reliability and stability are improved.
Further, in order to guarantee converter valve naturally press characteristic, and for commutation system shutdown after submodule provide
Discharge channel overhauls convenient for converter valve and safeguards that the both ends of submodule capacitor have been arranged in parallel equalizing resistance.
Further, in order to it is simple, reliably realize above-mentioned function, reduce the cost of MMC submodule, the MMC submodule
Described in two-way controllable switch be two-way full-controlled device, two-way half control device or by two unidirectional controllable devices reverse parallel connection structures
At two-way controlable electric current.
The present invention provides a kind of MMC, including six bridge arm topological structure of three-phase, and each bridge arm includes at least two of cascade setting
MMC submodule, having at least one MMC submodule in each MMC submodule includes submodule body topological structure and by-pass switch, institute
The both ends for stating by-pass switch have been arranged in parallel two-way controllable switch, when submodule breaks down, control by-pass switch closure, and
Whether detection by-pass switch is closed, if the by-pass switch is not closed, the two-way controllable switch conducting is controlled, in son
When module failure and corresponding by-pass switch tripping, two-way controllable switch conducting is controlled, realizes that the by-pass switch of tripping should
The function of realization, it is therefore prevented that the over-voltage of submodule capacitor, IGBT breakdown, or even there is the phenomenon that submodule kindling, it ensure that submodule
The operational safety of block improves DC transmission system reliability and stability.
Further, in order to guarantee converter valve naturally press characteristic, and for commutation system shutdown after submodule provide
Discharge channel overhauls convenient for converter valve and safeguards that the both ends of the submodule capacitor of each MMC submodule in the MMC are arranged in parallel
There is equalizing resistance.
Further, in order to it is simple, reliably realize above-mentioned function, reduce the cost of MMC submodule, each MMC of the MMC
Two-way controllable switch described in submodule is two-way full-controlled device, two-way half control device or reversed by two unidirectional controllable devices
The two-way controlable electric current that parallel connection is constituted.
Further, it in order to guarantee the power supply of control unit, maintains the stabilization of two-way controllable switch, be connected for a long time, mention
The reliability and stability of high system, each MMC submodule further include control unit and for the capacitor from corresponding MMC submodule
Both ends take can take can circuit, at least two MMC submodules each MMC submodule take can circuit output for be electrically connected it is described extremely
The control unit of all MMC submodules, realizes redundant power supply in few two MMC submodules.
Detailed description of the invention
Fig. 1 is a kind of flow chart of MMC submodule bypass protection method of the invention；
Fig. 2 is a kind of topology diagram of MMC full-bridge submodule of the invention；
Fig. 3 is a kind of topology diagram of MMC half-bridge submodule of the invention；
Fig. 4 is that the adjacent submodule intersection of MMC of the invention a kind of takes electrical schematic diagram.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
Embodiment of the method
The present invention provides a kind of MMC submodule bypass protection method, as shown in Figure 1, comprising the following steps:
(1) when submodule breaks down, corresponding by-pass switch closure is controlled.This step is existing technological means,
It can be realized by the prior art.
(2) whether detection by-pass switch is closed.
The detection that whether by-pass switch is closed in this step obtains for example, can carry out displacement signal by displacement sensor
It takes, detection whether by-pass switch closure is realized by the judgement of stroke；For another example, by branch where by-pass switch into
Row detection, detection whether by judging whether the branch is connected to realize that by-pass switch is closed.
(3) if by-pass switch is not closed, control is connected with the two-way controllable switch that by-pass switch is arranged in parallel.
In sub-module fault and corresponding by-pass switch tripping, two-way controllable switch conducting is controlled, realizes the side of tripping
The function that way switch should be realized.
In addition, being latched submodule while submodule breaks down and controls corresponding by-pass switch closure, and/or work as
It determines while by-pass switch is not closed and is also latched submodule, preferably to guarantee the reliable and stable fortune of DC transmission system
Row.
Executing this method can also be can be set using the original control system of multilevel converter in DC transmission system
Special control unit is controlled, wherein control include sub-module fault detection, by-pass switch closure whether detection and
The output of two-way controllable switch signal.
The applicable submodule type of this method is more, for example, half-bridge submodule, full-bridge submodule, clamper Shuangzi module or
Other existing sub-modular structures.
Full-bridge submodule embodiment
The present invention provides a kind of MMC full-bridge submodule, as shown in Fig. 2, the full-bridge submodule includes DC support capacitor
(C), 4 IGBT and its driving (VT1, VT2, VT3, VT4), by-pass switch (K), two-way controllable switch (VT5) and equalizing resistance
(R)。
Wherein, the both ends of by-pass switch (K) have been arranged in parallel two-way controllable switch (VT5), in sub-module fault and correspondence
By-pass switch tripping when, control the conducting of two-way controllable switch, realize the function that the by-pass switch of tripping should be realized.
It is preferred that two-way controllable switch is two-way full-controlled device, two-way half control device or anti-by two unidirectional controllable devices
The two-way controlable electric current constituted to parallel connection.
In addition, equalizing resistance (R) and the both ends of DC support capacitor (C) are arranged in parallel, there are two the effects of equalizing resistance
Aspect, first is that guarantee converter valve presses characteristic naturally, second is that the submodule after shutting down for commutation system provides discharge channel, just
It overhauls and safeguards in converter valve.The determination of voltage sharing resistance value is related according to the power of resistance and the size of capacitance voltage, generally
It is differed in a few k Ω to several hundred k Ω.Such as a kind of flexible direct current engineering, the resistance value of equalizing resistance are 25k Ω.But the full-bridge submodule
Equalizing resistance (R) can also be not provided in block, being not provided with equalizing resistance (R) still can be realized the basic training of full-bridge submodule
Energy.
Method can be realized in full-bridge submodule in above method embodiment, and wherein this method can be original using MMC
Control system, also can be set special control unit, and former control system or control unit realize that function includes submodule event
The output of detection and two-way controllable switch signal whether the detection of barrier, by-pass switch are closed.
Half-bridge submodule embodiment
The present invention provides a kind of MMC half-bridge submodule, as shown in figure 3, the half-bridge submodule includes DC support capacitor
(C), 2 IGBT and its driving (VT1, VT2), by-pass switch (K), two-way controllable switch (VT3) and equalizing resistance (R).
Wherein, the both ends of by-pass switch (K) have been arranged in parallel two-way controllable switch (VT3), in sub-module fault and correspondence
By-pass switch tripping when, control the conducting of two-way controllable switch, realize the function that the by-pass switch of tripping should be realized.
It is preferred that two-way controllable switch is two-way full-controlled device, two-way half control device or anti-by two unidirectional controllable devices
The two-way controlable electric current constituted to parallel connection.
In addition, equalizing resistance (R) and the both ends of DC support capacitor (C) are arranged in parallel, the effect of equalizing resistance is upper
It states and is illustrated in full-bridge submodule embodiment, details are not described herein.But equal piezoelectricity can also be not provided in the half-bridge submodule
It hinders (R), being not provided with equalizing resistance (R) still can be realized the basic function of half-bridge submodule.
Method can be realized in half-bridge submodule in above method embodiment, and wherein this method can be original using MMC
Control system, also can be set special control unit, and former control system or control unit realize that function includes submodule event
The output of detection and two-way controllable switch signal whether the detection of barrier, by-pass switch are closed.
MMC embodiment
The present invention provides a kind of MMC, including six bridge arm topological structure of three-phase, and each bridge arm includes at least two of cascade setting
MMC submodule, having at least one MMC submodule in each MMC submodule includes submodule body topological structure and by-pass switch, other
The both ends of way switch have been arranged in parallel two-way controllable switch.
Wherein the submodule in above-mentioned full-bridge submodule embodiment or half-bridge submodule embodiment can be used in MMC submodule,
Other existing sub-modular structures can also be used, this MMC embodiment is to cascade two MMC submodules of setting and two MMC
Module is to be illustrated for the full-bridge submodule with two-way controllable switch, as shown in Figure 4:
Full-bridge submodule is described in detail in above-mentioned full-bridge submodule embodiment, and details are not described herein.
In order to maintain the stabilization of two-way controllable switch, long-time to be connected, to improve the reliability and stability of system, herein
A control unit is arranged in corresponding each MMC submodule, and in addition to this, each MMC submodule further includes for from corresponding MMC
Both ends DC support capacitor (C) of submodule take can take can circuit, taking for each MMC submodule can electricity in two MMC submodules
Road output realizes redundant power supply for the control unit of all MMC submodules in two MMC submodules of electrical connection.
Energy circuit is taken to be composed in series by high voltage power supply and low-tension supply, high voltage power supply input terminal and DC support capacitor (C)
Both ends are in parallel, and output end is connected with low-tension supply input terminal, and low-tension supply output end is used for the control list of each MMC submodule
Member power supply.Such method can guarantee the control unit of each MMC submodule under a wide range of DC support capacitor (C) voltage,
Available reliable, stable power supply.Taken in the present invention can circuit Chinese patent application publication No. can be used be
Way to take power in CN105576953A.
Specific embodiment of the present invention is presented above, but the present invention is not limited to described embodiment.
The technological means in above-described embodiment is converted by the way of being readily apparent that those skilled in the art, is replaced,
Modification, and play the role of with the present invention in relevant art means it is essentially identical, realization goal of the invention it is also essentially identical,
The technical solution formed in this way is to be finely adjusted to be formed to above-described embodiment, and this technical solution still falls within protection of the invention
In range.
Claims (10)
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137902A (en) * | 2019-06-14 | 2019-08-16 | 中国南方电网有限责任公司超高压输电公司天生桥局 | One kind prevents flexible direct current power module by-pass switch from refusing combined floodgate circuit and method |
| CN110504825A (en) * | 2019-08-07 | 2019-11-26 | 中国南方电网有限责任公司超高压输电公司广州局 | A control system to improve the safety and reliability of MMC power module bypass |
| CN110635675A (en) * | 2019-10-30 | 2019-12-31 | 特变电工西安柔性输配电有限公司 | Flexible direct-current transmission converter valve starting method based on black module detection |
| CN110677029A (en) * | 2019-10-21 | 2020-01-10 | 中国南方电网有限责任公司超高压输电公司 | A Modular Multilevel Converter Power Module Topology with Passive Overvoltage Protection |
| CN110739837A (en) * | 2019-11-05 | 2020-01-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC power module adopting double bypass switches and overvoltage three-bypass method |
| CN110783893A (en) * | 2019-11-14 | 2020-02-11 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Overvoltage protection method for flexible direct current power module |
| CN110829811A (en) * | 2019-09-29 | 2020-02-21 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC power module overvoltage protection circuit and multistage bypass method |
| CN111200374A (en) * | 2019-12-26 | 2020-05-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Power unit secondary circuit topology and method supporting automatic detection |
| CN111245267A (en) * | 2020-02-17 | 2020-06-05 | 中电普瑞电力工程有限公司 | Half-bridge type MMC submodule topological structure |
| CN111262266A (en) * | 2020-01-17 | 2020-06-09 | 中国南方电网有限责任公司超高压输电公司广州局 | Backup protection method for bypass switch failure of MMC power module |
| CN111711350A (en) * | 2020-06-04 | 2020-09-25 | 国网浙江省电力有限公司电力科学研究院 | A method for improving operation reliability of MMC converter valve |
| CN112186776A (en) * | 2020-10-12 | 2021-01-05 | 国电南京自动化股份有限公司 | Power module bypass structure, SVG bypass system and control method |
| CN112803796A (en) * | 2021-02-01 | 2021-05-14 | 全球能源互联网研究院有限公司 | Hybrid converter topological structure with active phase commutation and control method thereof |
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| CN113381387A (en) * | 2020-02-25 | 2021-09-10 | 南京南瑞继保电气有限公司 | Sub-module bypass switch failure detection method |
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| CN114079372A (en) * | 2020-08-20 | 2022-02-22 | 许继集团有限公司 | Flexible direct current transmission electronic module redundant power supply and cutting device and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137902A (en) * | 2019-06-14 | 2019-08-16 | 中国南方电网有限责任公司超高压输电公司天生桥局 | One kind prevents flexible direct current power module by-pass switch from refusing combined floodgate circuit and method |
| CN110504825A (en) * | 2019-08-07 | 2019-11-26 | 中国南方电网有限责任公司超高压输电公司广州局 | A control system to improve the safety and reliability of MMC power module bypass |
| CN110829811A (en) * | 2019-09-29 | 2020-02-21 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC power module overvoltage protection circuit and multistage bypass method |
| CN110677029A (en) * | 2019-10-21 | 2020-01-10 | 中国南方电网有限责任公司超高压输电公司 | A Modular Multilevel Converter Power Module Topology with Passive Overvoltage Protection |
| CN110635675B (en) * | 2019-10-30 | 2021-04-27 | 特变电工西安柔性输配电有限公司 | Flexible direct-current transmission converter valve starting method based on black module detection |
| CN110635675A (en) * | 2019-10-30 | 2019-12-31 | 特变电工西安柔性输配电有限公司 | Flexible direct-current transmission converter valve starting method based on black module detection |
| CN110739837A (en) * | 2019-11-05 | 2020-01-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | MMC power module adopting double bypass switches and overvoltage three-bypass method |
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| CN112803796A (en) * | 2021-02-01 | 2021-05-14 | 全球能源互联网研究院有限公司 | Hybrid converter topological structure with active phase commutation and control method thereof |
| CN113300330A (en) * | 2021-06-28 | 2021-08-24 | 全球能源互联网研究院有限公司 | Modular multilevel converter, control method thereof, storage medium, and electronic device |
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Application publication date: 20190409 |