CN103904658A - Modular multilevel converter with bridge arm redundancy function and control method thereof - Google Patents
Modular multilevel converter with bridge arm redundancy function and control method thereof Download PDFInfo
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- CN103904658A CN103904658A CN201410124960.9A CN201410124960A CN103904658A CN 103904658 A CN103904658 A CN 103904658A CN 201410124960 A CN201410124960 A CN 201410124960A CN 103904658 A CN103904658 A CN 103904658A
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- 230000003068 static effect Effects 0.000 claims abstract description 6
- 238000002955 isolation Methods 0.000 claims description 11
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- 238000005516 engineering process Methods 0.000 description 3
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention relates to a modular multilevel converter with a bridge arm redundancy function and a control method thereof. The modular multilevel converter comprises six converter arms, two converter arms are connected in series in one group, the series connection points of the two converter arms are connected into an alternating current system, the three groups of converter arms are connected at two ends in a star shape, and the converter arms are connected in series by a plurality of power modules, reactors and switch circuits. The control method of the modular multilevel converter is characterized in that under the condition that the modular multilevel converter is in a normal operation state of a static reactive compensator, each switch circuit keeps the closed state of a current path, and when a certain bridge arm in the modular multilevel converter cannot work continuously due to faults, the switch circuit in the bridge arm and two bridge arms star-connected to the same point is disconnected. The invention utilizes the switching circuit to ensure that the modular multilevel converter in the state of the static reactive compensator continues to work under the condition that a certain bridge arm cannot run, thereby improving the reliability of the modular multilevel converter.
Description
Technical field
The present invention relates to a kind of modularization multi-level converter, especially comprise switching circuit at brachium pontis, there is the modularization multi-level converter of brachium pontis redundancy feature, belong to technology of transmission of electricity field.
Background technology
The safety of electrical network, economical operation depend on that its " degree of controllability ", especially Network Voltage Stability depend primarily on the balance of reactive power to a great extent, namely for " degree of controllability " of reactive power.Modularization multi-level converter is a kind of converter that adopts device for high-power power electronic and modularization Topology Structure Design, both can be used as the converter of flexible DC power transmission system, also can be used as independently reactive generating device, it has that output harmonic wave characteristic is good, fast response time, be easy to install and the feature such as manufacture, can support for electrical network provides quick dynamic reactive, improve Network Voltage Stability.
As a rule, modularization multi-level converter has the redundancy feature of power model fault: can be by by-pass switch by the bypass of fault power module in the time that one or more power models break down, and remaining sound part can continue normal operation.At present existing several publications have been designed into this redundant configuration about power model and control method (publication number CN103187724A, CN103227464A) thereof.But, when the power model number of fault too much, brachium pontis need to stop transport situation that the brachium pontis such as Reactor Fault in maintenance or brachium pontis cannot continue normal work while occurring, the redundancy scheme of depending merely on power model cannot ensure the continuation operation of modularization multi-level converter.
Summary of the invention
The object of the invention is to address the above problem provides a kind of modularization multi-level converter with brachium pontis redundancy feature.The invention enables modularization multi-level converter in the case of the power model number of fault too much, the brachium pontis brachium pontis such as Reactor Fault of need to stopping transport in maintenance or brachium pontis cannot continue normal work to work on, support for electrical network provides dynamic reactive power.
Another object of the present invention is to provide a kind of control method of the modularization multi-level converter with brachium pontis redundancy feature.
For solving the problems of the technologies described above, technical scheme of the present invention is: the modularization multi-level converter with brachium pontis redundancy feature of the present invention, include six change of current brachium pontis, wherein connect taking two brachium pontis as one group, two brachium pontis be connected in series an incoming transport system, three groups of brachium pontis are connected with star fashion at two ends, and described change of current brachium pontis is in series by several power models, reactor and switching circuit.
Described switching circuit is isolation switch.
Described switching circuit is circuit breaker.
Described switching circuit is the combinational being combined by isolation switch and circuit breaker.
Power model in described change of current brachium pontis is the power model of full-bridge or half-bridge pattern.
The control method of the modularization multi-level converter with brachium pontis redundancy feature of the present invention, the described modularization multi-level converter with brachium pontis redundancy feature includes six change of current brachium pontis, wherein connect taking two brachium pontis as one group, two brachium pontis be connected in series an incoming transport system, three groups of brachium pontis are connected with star fashion at two ends, the control method of modularization multi-level converter is when modularization multi-level converter is under Static Var Compensator state normal operation, each switching circuit keeps the closure state of current path, in the time that in modularization multi-level converter, certain brachium pontis cannot work on because of fault, the described switching circuit that this brachium pontis and star thereof are connected in two brachium pontis of same point disconnects.
The present invention is because employing includes six change of current brachium pontis, wherein connect taking two brachium pontis as one group, two brachium pontis be connected in series an incoming transport system, three groups of brachium pontis are connected with star fashion at two ends, described change of current brachium pontis is by several power models, the structure that reactor and switching circuit are in series, can utilize the buffer action of switching circuit, in the situation that certain brachium pontis cannot move, by disconnect this brachium pontis and star thereof be connected to same point two brachium pontis switching circuit and change the control mode of modularization multi-level converter, modularization multi-level converter is worked on, thereby there is brachium pontis redundancy feature, improve the reliability of modularization multi-level converter.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, patent of the present invention is further described.
Fig. 1 is the structure chart of patent modularization multi-level converter of the present invention.
Fig. 2 is the embodiment that the present invention realizes brachium pontis redundancy feature.
Embodiment
The modularization multi-level converter with brachium pontis redundancy feature of the present invention, include six change of current brachium pontis A1～A6, wherein connect taking two brachium pontis as one group, two brachium pontis be connected in series an incoming transport system, three groups of brachium pontis are connected with star fashion at two ends, and described change of current brachium pontis is in series by several power models M1～Mn, reactor L and switching circuit S.Power model in described change of current brachium pontis is the power model of full-bridge or half-bridge pattern.
In the present embodiment, described switching circuit S is isolation switch.Described switching circuit S is circuit breaker.Described switching circuit S is the combinational being combined by isolation switch and circuit breaker.Power model in described change of current brachium pontis is the power model of full-bridge or half-bridge pattern.
The control method of the modularization multi-level converter with brachium pontis redundancy feature of the present invention, the described modularization multi-level converter with brachium pontis redundancy feature includes six change of current brachium pontis A1～A6, wherein connect taking two brachium pontis as one group, two brachium pontis be connected in series an incoming transport system, three groups of brachium pontis are connected with star fashion at two ends, the control method of modularization multi-level converter is when modularization multi-level converter is under Static Var Compensator state normal operation, each switching circuit S keeps the closure state of current path, in the time that in modularization multi-level converter, certain brachium pontis cannot work on because of fault, the described switching circuit S that this brachium pontis and star thereof are connected in two brachium pontis of same point disconnects.
Fig. 2 is a specific embodiment of the present invention, modularization multi-level converter in figure is made up of six change of current brachium pontis A1～A6, six brachium pontis are taking two as one group, as A1 and A4, A2 and A5, A3 connects with A6, be connected in series an incoming transport system, three groups of brachium pontis are connected with star fashion at two ends, and tie point is CP and CN in figure, and described change of current brachium pontis is in series by power model M1～Mn, reactor L and the isolation switch S of half-bridge pattern.The converter transformer that the interchange end of modularization multi-level converter is Dyn by a mode of connection is connected with extraneous AC system.
In the time that modularization multi-level converter normally moves, the control mode of converter is identical with general voltage-source type converter, major control link is: outer shroud adopts and controls the active power control ring that target is CP and CN electrical potential difference Edc and control target is the Reactive Power Control ring of output reactive power or ac grid voltage, interior ring adopts the Direct Current Control method of indirect current control method or pq decoupling zero, and the control of brachium pontis power model capacitance voltage balance adopts ranking method.
Method of operation while breaking down taking brachium pontis A4～A6 is below described modularization multi-level converter of the present invention as example and how to be realized brachium pontis redundancy feature, method of operation when brachium pontis A1～A3 fault is similar with it: in the time that any one brachium pontis in A4～A6 maybe needs maintenance to continue to move because of fault, isolation switch S in brachium pontis A4～A6 is adjusted to isolation, keeps the channel status of the isolation switch S in brachium pontis A1～A3 constant.Because the brachium pontis tie point CN electromotive force of converter after change circuit structure is unsettled, now converter control link need to be made a change, and the control target of active power control ring becomes from controlling Edc voltage to earth or the brachium pontis power model capacitance voltage sum of controlling CP.The control target of Reactive Power Control ring remains reactive power reference qref or AC system voltage, and other controlling units remain unchanged, and changes electric current structure converter afterwards and can continue to move as reactive power compensation device.
In above embodiment, if switching circuit S circuit breaker or the combinational that is combined into by isolation switch and circuit breaker, the adjustment mode of its on off state is constant.
Claims (6)
1. one kind has the modularization multi-level converter of brachium pontis redundancy feature, it is characterized in that: include six change of current brachium pontis (A1～A6), wherein connect taking two brachium pontis as one group, two brachium pontis be connected in series an incoming transport system, three groups of brachium pontis are connected with star fashion at two ends, and described change of current brachium pontis is in series by several power models (M1～Mn), reactor (L) and switching circuit (S).
2. the modularization multi-level converter with brachium pontis redundancy feature as claimed in claim 1, is characterized in that: described switching circuit (S) is isolation switch.
3. the modularization multi-level converter with brachium pontis redundancy feature as claimed in claim 1, is characterized in that: described switching circuit (S) is circuit breaker.
4. the modularization multi-level converter with brachium pontis redundancy feature as claimed in claim 1, is characterized in that: the combinational of described switching circuit (S) for being combined by isolation switch and circuit breaker.
5. the modularization multi-level converter of the two Static Var Compensator as described in claim 1 to 4 any one, is characterized in that: the power model in described change of current brachium pontis is the power model of full-bridge or half-bridge pattern.
6. one kind has the control method of the modularization multi-level converter of brachium pontis redundancy feature, the described modularization multi-level converter with brachium pontis redundancy feature includes six change of current brachium pontis (A1～A6), wherein connect taking two brachium pontis as one group, two brachium pontis be connected in series an incoming transport system, three groups of brachium pontis are connected with star fashion at two ends, the control method that it is characterized in that modularization multi-level converter is when modularization multi-level converter is under Static Var Compensator state normal operation, each switching circuit (S) keeps the closure state of current path, in the time that in modularization multi-level converter, certain brachium pontis cannot work on because of fault, the described switching circuit (S) that this brachium pontis and star thereof are connected in two brachium pontis of same point disconnects.
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| CN201410124960.9A CN103904658A (en) | 2014-03-31 | 2014-03-31 | Modular multilevel converter with bridge arm redundancy function and control method thereof |
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| CN201410124960.9A CN103904658A (en) | 2014-03-31 | 2014-03-31 | Modular multilevel converter with bridge arm redundancy function and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107769593A (en) * | 2017-10-17 | 2018-03-06 | 南方电网科学研究院有限责任公司 | Power electronic equipment and control method thereof |
| CN109565246A (en) * | 2016-07-05 | 2019-04-02 | 超级电力研究所有限公司 | For controlling the module of the internal energy of converter |
| CN113131444A (en) * | 2020-01-15 | 2021-07-16 | 许继集团有限公司 | Bridge arm current stress reduction method and system for flexible direct current transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109565246A (en) * | 2016-07-05 | 2019-04-02 | 超级电力研究所有限公司 | For controlling the module of the internal energy of converter |
| CN109565246B (en) * | 2016-07-05 | 2021-11-12 | 超级电力研究所有限公司 | Module for controlling the internal energy of a converter |
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| CN113131444A (en) * | 2020-01-15 | 2021-07-16 | 许继集团有限公司 | Bridge arm current stress reduction method and system for flexible direct current transmission system |
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Owner name: CHINA SOUTHERN POWER GRID CO., LTD. Effective date: 20141224 |
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Effective date of registration: 20141224 Address after: Guangzhou City, Guangdong province Yuexiu District 510080 Dongfeng East Road, No. 8, 6 water Kong Guangdong building project Applicant after: China South Power Grid International Co.,Ltd. Applicant after: CHINA SOUTHERN POWER GRID Co.,Ltd. Address before: Guangzhou City, Guangdong province Yuexiu District 510080 Dongfeng East Road, No. 8, 6 water Kong Guangdong building project Applicant before: China South Power Grid International Co.,Ltd. |
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Application publication date: 20140702 |
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| RJ01 | Rejection of invention patent application after publication |