CN113381595A - MMC sub-module and bypass protection method thereof - Google Patents
MMC sub-module and bypass protection method thereof Download PDFInfo
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- CN113381595A CN113381595A CN202010115740.5A CN202010115740A CN113381595A CN 113381595 A CN113381595 A CN 113381595A CN 202010115740 A CN202010115740 A CN 202010115740A CN 113381595 A CN113381595 A CN 113381595A
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- bypass switch
- bypass
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- magnetic circuit
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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
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses an MMC sub-module and a bypass protection method thereof. The conventional bypass switch of the MMC sub-module is an electromagnetic single-drive type mechanical structure, certain rejection risk exists, and when the bypass switch rejects, the converter needs to stop running, so that the running reliability of the converter is reduced. The technical scheme adopted by the invention is as follows: when the MMC submodule has a fault, the reliable bypass of the fault MMC submodule is realized through the electromagnetic dual-drive bypass switch, and the running reliability of the converter is improved.
Description
Technical Field
The invention relates to the field of flexible direct current power transmission and distribution, in particular to an MMC sub-module and a bypass protection method thereof.
Background
The flexible direct current transmission technology can be applied to power supply of distributed renewable energy source grid connection, islands and urban dense load areas. The voltage source type modular multilevel converter based on the fully-controlled power electronic switching device is widely applied to the field of flexible direct current transmission. The Modular Multilevel Converter (MMC) realizes high-voltage output by serially connecting a plurality of MMC sub-modules, does not need direct cascade of a switching device, has low requirement on consistent triggering of the device, and has the advantages of good expansibility, low switching frequency, low running loss, high output voltage waveform quality and the like.
The MMC submodule is required to be subjected to bypass protection when a fault occurs, a converter is cut off from a system, the converter is guaranteed to continue to stably operate, a bypass switch is usually adopted to realize bypass isolation of the fault submodule during operation, and the fault submodule is short-circuited and quits from operation by closing the bypass switch in the fault submodule when the submodule fault occurs. However, because the bypass switch of the currently used sub-module is an electromagnetic single-drive type mechanical structure, certain action rejection risks exist, and when the bypass switch rejects action, the converter needs to stop running, so that the running reliability of the converter is reduced.
In view of the above analysis, the present invention provides an MMC sub-module and a bypass protection method thereof, which realize reliable bypass of a faulty MMC sub-module by using an electromagnetic dual-drive bypass switch when the MMC sub-module is faulty, thereby improving the operation reliability of the converter.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the MMC sub-module and the bypass protection method thereof, which ensure that when the MMC sub-module breaks down, the reliable bypass of the broken MMC sub-module is realized through the electromagnetic dual-drive bypass switch, and the operation reliability of the converter is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
the MMC sub-module is characterized in that an alternating current end of the sub-module is connected with an electromagnetic dual-drive bypass switch in parallel for bypass protection.
Furthermore, in the MMC sub-module, the closing drive magnetic circuit of the electromagnetic dual-drive bypass switch includes a main drive magnetic circuit and an auxiliary drive magnetic circuit, and both the main drive magnetic circuit and the auxiliary drive magnetic circuit are triggered to close the bypass switch.
The invention also provides a bypass protection method of the MMC sub-module, which comprises the following steps:
step 1: triggering a main driving magnetic circuit of the electromagnetic dual-drive bypass switch, and closing the bypass switch through the main driving magnetic circuit; entering the step 2;
step 2: after delaying the preset time td, the submodule detects an auxiliary position contact of the bypass switch; entering the step 3;
and step 3: if the auxiliary position contact of the bypass switch is displaced, the sub-module bypass switch is successfully switched on, the sub-module realizes bypass protection, and the process is finished; otherwise, entering step 4;
and 4, step 4: if the auxiliary position contact of the bypass switch is not displaced, an auxiliary driving magnetic circuit of the electromagnetic dual-drive bypass switch is triggered, and the bypass switch is switched on through the auxiliary driving magnetic circuit; entering the step 5;
and 5: and the submodule bypass switch is successfully switched on, and the submodule realizes bypass protection.
Further, in the method for bypass protection of the converter submodule, the preset time td is the time for operating the auxiliary contact of the bypass switch.
After the scheme is adopted, the invention has the beneficial effects that: the MMC sub-module and the bypass protection method thereof provided by the invention solve the problem that the bypass switch of an electromagnetic single-drive type mechanical structure is unreliable in switching on, ensure that when the MMC sub-module breaks down, the bypass switch can be switched on by a main drive magnetic circuit or an auxiliary drive magnetic circuit through the electromagnetic double-drive bypass switch, realize the reliable bypass of the broken MMC sub-module and improve the operation reliability of a converter.
Drawings
Fig. 1 is a modular multilevel topology converter;
FIG. 2 is a schematic diagram of a main drive magnetic circuit bypass sub-module;
FIG. 3 is a schematic diagram of an auxiliary drive magnetic circuit bypass sub-module;
FIG. 4 is a schematic diagram of a sub-module bypass protection method.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
A current converter of a modular multilevel topological structure is shown in figure 1 and comprises at least one sub-module, wherein the sub-modules are connected in series and are of half-bridge, full-bridge and other topological structures, and the sub-modules are subjected to bypass protection by adopting an electromagnetic dual-drive bypass switch K.
An MMC sub-module is shown in figures 3 and 4, wherein an alternating current end of the sub-module is connected with an electromagnetic dual-drive bypass switch in parallel for bypass protection. The closing drive magnetic circuit of the electromagnetic dual-drive bypass switch comprises a main drive magnetic circuit and an auxiliary drive magnetic circuit, and the bypass switch can be closed by triggering the main drive magnetic circuit or the auxiliary drive magnetic circuit.
The embodiment of the bypass protection method for the MMC sub-module, as shown in fig. 2, includes the following steps:
step 1: triggering a main driving magnetic circuit X1 of the electromagnetic dual-drive bypass switch, and as shown in FIG. 3, closing the bypass switch through the main driving magnetic circuit; entering the step 2;
step 2: after delaying the preset time td, the submodule detects an auxiliary position contact of the bypass switch; entering the step 3;
and step 3: if the auxiliary position contact of the bypass switch is displaced, the sub-module bypass switch is successfully switched on, the sub-module realizes bypass protection, and the process is finished; otherwise, entering step 4;
and 4, step 4: if the auxiliary position contact of the bypass switch is not displaced, triggering an auxiliary driving magnetic circuit X2 of the electromagnetic dual-drive bypass switch, and as shown in FIG. 4, closing the bypass switch through the auxiliary driving magnetic circuit; entering the step 5;
and 5: and the submodule bypass switch is successfully switched on, and the submodule realizes bypass protection.
A bypass protection method for a submodule of a converter is characterized in that preset time td is the action time of an auxiliary contact of a bypass switch, and is generally about 10 ms.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, which are only for illustrating the technical idea of the present invention and are not to be construed as limiting the scope of the present invention. Those of ordinary skill in the art will understand that: modifications and equivalents of the embodiments of the present invention may be made without departing from the spirit and scope of the invention as set forth in the claims below.
Claims (4)
1. The MMC sub-module is characterized in that an alternating current end of the sub-module is connected with an electromagnetic dual-drive bypass switch in parallel to perform bypass protection.
2. The MMC sub-module of claim 1, wherein a closing drive magnetic circuit of the electromagnetic dual-drive bypass switch comprises a primary drive magnetic circuit and a secondary drive magnetic circuit, and triggering either the primary drive magnetic circuit or the secondary drive magnetic circuit causes the bypass switch to close.
3. The MMC sub-module bypass protection method of claim 1 or 2, characterized in that the method comprises the steps of:
step 1: triggering a main driving magnetic circuit of the electromagnetic dual-drive bypass switch, and closing the bypass switch through the main driving magnetic circuit; entering the step 2;
step 2: after delaying the preset time td, the submodule detects an auxiliary position contact of the bypass switch; entering the step 3;
and step 3: if the auxiliary position contact of the bypass switch is displaced, the sub-module bypass switch is successfully switched on, the sub-module realizes bypass protection, and the process is finished; otherwise, entering step 4;
and 4, step 4: if the auxiliary position contact of the bypass switch is not displaced, an auxiliary driving magnetic circuit of the electromagnetic dual-drive bypass switch is triggered, and the bypass switch is switched on through the auxiliary driving magnetic circuit; entering the step 5;
and 5: and the submodule bypass switch is successfully switched on, and the submodule realizes bypass protection.
4. The bypass protection method for the sub-module of the converter according to claim 3, wherein the preset time td is a bypass switch auxiliary contact action time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010115740.5A CN113381595A (en) | 2020-02-25 | 2020-02-25 | MMC sub-module and bypass protection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010115740.5A CN113381595A (en) | 2020-02-25 | 2020-02-25 | MMC sub-module and bypass protection method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113381595A true CN113381595A (en) | 2021-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010115740.5A Pending CN113381595A (en) | 2020-02-25 | 2020-02-25 | MMC sub-module and bypass protection method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394554A (en) * | 2011-10-13 | 2012-03-28 | 国电南京自动化股份有限公司 | Power unit bypass circuit with redundancy control function |
| CN105548871A (en) * | 2015-12-09 | 2016-05-04 | 许继集团有限公司 | MMC sub-module bypass switch state detection device and MMC sub-module bypass switch |
| US20190173392A1 (en) * | 2016-08-05 | 2019-06-06 | Nr Electric Co., Ltd | Reconfigurable mmc sub-module unit and control unit thereof |
| CN110808606A (en) * | 2019-12-09 | 2020-02-18 | 南方电网科学研究院有限责任公司 | Power module overvoltage prevention circuit of flexible direct current transmission and converter valve |
-
2020
- 2020-02-25 CN CN202010115740.5A patent/CN113381595A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394554A (en) * | 2011-10-13 | 2012-03-28 | 国电南京自动化股份有限公司 | Power unit bypass circuit with redundancy control function |
| CN105548871A (en) * | 2015-12-09 | 2016-05-04 | 许继集团有限公司 | MMC sub-module bypass switch state detection device and MMC sub-module bypass switch |
| US20190173392A1 (en) * | 2016-08-05 | 2019-06-06 | Nr Electric Co., Ltd | Reconfigurable mmc sub-module unit and control unit thereof |
| CN110808606A (en) * | 2019-12-09 | 2020-02-18 | 南方电网科学研究院有限责任公司 | Power module overvoltage prevention circuit of flexible direct current transmission and converter valve |
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Application publication date: 20210910 |