CN110739837A - MMC power module adopting double bypass switches and overvoltage three-bypass method - Google Patents
MMC power module adopting double bypass switches and overvoltage three-bypass method Download PDFInfo
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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Abstract
The invention discloses MMC power modules adopting double bypass switches and an overvoltage three-bypass method, wherein the MMC power module adopting the double bypass switches comprises a bypass switch which is connected at two ends of the MMC power module in parallel, when the capacitance voltage of the MMC power module exceeds a set safety value, a bypass switch is closed to enable the MMC power module to bypass, and a second bypass switch receives a closing instruction and is closed to enable the MMC power module to bypass when the bypass switch fails to operate in the MMC power module.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to MMC power modules adopting double bypass switches and an overvoltage three-bypass method.
Background
With the development of a high-power flexible direct-current transmission technology, modular multilevel Converter valves (MMC) are applied to engineering more and more, and have the advantages of low switching frequency, low loss, flexibility in control and the like.
The control logic of the current parallel bypass switch is that an energy-taking power source takes energy through voltage at two ends of a direct current capacitor and converts the energy into 15V voltage and 400V voltage, 15V output voltage supplies power to a main control board and an IGBT drive board, 400V voltage supplies power to a bypass switch drive board, a converter valve control system communicates with the main control board of the power module through optical fibers, the main control board and the bypass switch drive board communicate through the optical fibers, when the power module fails, the main control board judges that a capacitor voltage signal is too high, applies for valve control to issue a bypass command, after the valve control receives a request signal, the valve control board issues the trigger bypass switch command through the optical fibers, the main control board issues the bypass switch drive board, finally the bypass switch issues the trigger command to trigger the bypass switch to close the bypass switch, and the failed power module is cut off, when of the bypass switch fails, the problem that the main control board fails, the power module fails, the bypass switch operates, and the converter valve failure is finally caused by the failure.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned deficiencies of the prior art, and to provide MMC power modules using dual bypass switches and an overvoltage triple-bypass method, so as to improve the reliability of the bypass of the power module and avoid the shutdown of the flexible direct current system due to unreliable bypass of the power module.
In order to achieve the purpose, the technical scheme of the invention is as follows:
MMC power module using dual bypass switch, comprising:
when the capacitor voltage of the MMC power module exceeds a set safety value, the bypass switch is closed, so that the MMC power module bypasses;
and when the th bypass switch fails in the MMC power module, the second bypass switch receives a closing instruction, and the second bypass switch is closed, so that the MMC power module is bypassed.
, the MMC power module with double bypass switch further comprises:
the th bypass switch driving circuit, the th bypass switch driving circuit comprises a main control board, a valve control, a th bypass switch driving board and a th energy-obtaining power supply;
the th energy-taking power supply is used for converting the voltage of the direct current capacitor of the MMC power module into working voltages of the main control board and the bypass switch drive board and supplying power for the work of the main control board and the bypass switch drive board, the main control board is used for detecting the voltage at two ends of the direct current capacitor of the MMC power module, when the voltage reaches a protection value, the main control board sends a bypass request command to the valve control, the valve control sends the bypass command to the main control board after logical judgment and meeting requirements, the main control board sends the bypass command to the bypass switch drive board after receiving the bypass command, and the bypass switch drive board sends a bypass closing command to close the bypass switch so as to cut off the fault power module.
, the closing trigger signal of the bypass switch is also sent out by the main control board, the main control board directly detects the voltage at two ends of the direct current capacitor through a hardware detection loop of the main control board and compares the voltage with a set value for judgment, and if the voltage exceeds the set value, the signal is sent out to trigger the bypass switch to be closed, so that reliable bypass is realized.
, the MMC power module with double bypass switch further comprises:
a second bypass switch drive circuit, the second bypass switch drive circuit comprising: a second bypass switch drive board and a second energy-taking power supply;
the second energy-obtaining power supply is used for converting the voltage of a direct-current capacitor of the MMC power module into a second bypass switch driving board working voltage and supplying power for the work of the second bypass switch driving board;
the second bypass switch driving board directly detects the voltage at two ends of the direct current capacitor through a hardware detection loop of the second bypass switch driving board, compares the voltage with a set value and judges the voltage, and if the voltage exceeds the set value, a signal is sent to trigger the second bypass switch to be closed, so that reliable bypass is realized.
Correspondingly, the invention also provides an MMC power module overvoltage three-bypass method, which is carried out by adopting the MMC power module adopting the double-bypass switch, and comprises the following steps:
and , bypassing, namely when the main control board detects that the voltage of the direct current capacitor reaches th overvoltage set value V1 through a voltage sampling loop, requesting valve control to send a bypass signal through software judgment written in the FPGA of the main control board, sending the bypass signal to the main control board after the valve control is judged to be qualified through logic judgment, sending the bypass signal to a th bypass switch drive board after the main control board receives the bypass signal, and sending a signal to trigger a th bypass switch after the th bypass switch drive board receives the bypass signal so as to bypass the power module.
And a second bypass, wherein when the voltage of the capacitor reaches a second overvoltage set value V2 after the th overvoltage bypass fails due to faults, the voltage at two ends of the capacitor is directly compared and judged with the set value through a hardware detection loop by a main control board, a trigger signal is sent to a th bypass switch driving board, and after the th bypass switch driving board receives the trigger signal, a th bypass switch is triggered to bypass the power module.
And in the third bypass, after both the th overvoltage bypass method and the second overvoltage bypass method fail due to faults, when the capacitor voltage reaches a third section backup protection set value V3, the hardware detection loop of the second bypass switch drive board directly compares and judges the voltage at two ends of the capacitor with the set value V3, and sends a signal to trigger the bypass switch, so that reliable bypass is realized.
Further , the V1< V2< V3, and V3 is less than the rated voltage value of the IGBT of the MMC power module.
Compared with the prior art, the invention has the beneficial effects that:
1. by arranging the two bypass switches, the reliability of the bypass of the power module is improved, and the shutdown of the flexible direct-current system caused by the unreliable bypass of the power module is avoided.
2. Two bypass switches are triggered respectively by setting two sets of bypass switch trigger circuits, trigger signals do not influence each other, and reliability of bypass action is improved
3. The second can power of getting compares with can power of getting, and the function is simpler, and components and parts are few, and circuit structure is simpler, and the reliability is higher.
4. Compared with the th bypass switch driving circuit, the second bypass switch driving circuit has simpler functions, fewer components, simpler circuit structure and higher reliability.
5. The second bypass switch protection is the backup protection of the th bypass switch, the closing conditions of the second bypass switch are that the capacitance voltage is higher than the threshold V3, the threshold V3 is lower than the IGBT withstand voltage value, and the IGBT can be effectively protected from being broken down by the capacitance voltage.
Through above measure, guarantee that power module's IGBT is not controlled, when power module was continuously charged, power module was reliably by the bypass, and IGBT and electric capacity do not explode, do not cause the influence to all the other power modules, do not influence the gentle straight system's of MMC converter valve continuation operation, promote system reliability.
Drawings
FIG. 1 is a circuit diagram of an MMC full-bridge power module employing a dual bypass switch;
FIG. 2 is a circuit diagram of an MMC half-bridge power module employing dual bypass switches;
FIG. 3 is a control circuit diagram of an MMC power module with a dual bypass switch;
in the figure, the main control board 10, the valve control board 11, the bypass switch driving board 12 and , the energy-obtaining power supply 13 and , the second bypass switch driving board 20 and the second energy-obtaining power supply 21 are arranged.
Detailed Description
The present invention is described in further detail with reference to the figures and the detailed description.
Example (b):
referring to fig. 1-2, the MMC power module using the dual bypass switch provided in this embodiment includes a -th bypass switch K1 and a second bypass switch K2.
The bypass switch K1 is connected to two ends of the MMC power module in parallel, the bypass switch K1 is closed when the voltage of a capacitor C of the MMC power module exceeds a set safety value, so that the MMC power module bypasses, and the second bypass switch receives a closing instruction and is closed when the bypass switch K1 fails and is refused in the MMC power module, so that the MMC power module bypasses.
Therefore, the reliability of the bypass of the power module is improved by arranging the two bypass switches, and the shutdown of the flexible direct-current system caused by the unreliable bypass of the power module is avoided.
Optionally, as shown in fig. 3, the MMC power module using the dual bypass switches further includes an th bypass switch driving circuit, where the th bypass switch driving circuit includes a main control board 10, a valve control 11, a 0 th bypass switch driving board 12, and a 1 th energy-obtaining power supply 13, a working power supply voltage of the main control board 10 is 15V, the th energy-obtaining power supply 13 supplies power, a working power supply voltage of the th bypass switch driving board 12 is 400V, and the th energy-obtaining power supply 13 supplies power, for the th bypass switch K1, the main control board 10 detects a voltage across a dc capacitor C of the power module, and when the voltage reaches a protection value, the main control board 10 sends a bypass request command to the valve control 11, the valve control 11 sends a bypass command to the main control board 10 after a logical judgment and meeting a requirement, the main control board 10 sends a bypass command to the th bypass switch driving board 12 after receiving the bypass command, and the th bypass switch 12 sends a closing bypass switch command to close the th bypass switch K1 to.
Preferably, the closing signal of the th bypass switch K1 is obtained by that the main control board 10 directly detects the voltage at the two ends of the direct current capacitor C through a hardware detection loop and compares the voltage with a set value for judgment, and if the voltage exceeds the set value, a signal is sent to trigger the th bypass switch K1 to be closed to realize reliable bypass.
Optionally, the MMC power module using the dual bypass switch further includes a second bypass switch driving circuit, the second bypass switch driving circuit includes a second bypass switch driving board 20 and a second energy-obtaining power source 21, the second energy-obtaining power source 21 is used for converting the voltage of the dc capacitor C into 400V to supply power to the second bypass switch driving board 20, when the bypass switch K1 fails, the voltage of the capacitor C rises to a backup protection value, the second bypass switch driving board 20 uses a hardware circuit to directly collect the voltage across the dc capacitor C, and a comparator judges that a command for closing the second bypass switch is issued, that is, the second bypass switch driving circuit has fewer driving circuits than the bypass switch driving circuit, and is single in function , and only uses the hardware circuit for logical judgment, the bypass logical link is shorter, the reliability is higher, and the system reliability is further improved by steps, meanwhile, the second energy-obtaining power source 21 is used for converting the voltage of the dc capacitor C into 400V, and is simpler in function of converting the voltage of the IGBT driving board 21 into the voltage of the IGBT driving board 12, and the IGBT driving board 12 can be simpler in function of converting the dc capacitor C voltage of the dc capacitor C into 400V 12, and the IGBT driving board 12, and can be used for simplifying the IGBT driving circuit as compared with the function of the .
Correspondingly, the present embodiment also provides an MMC power module overvoltage three-bypass method, which is performed by using the MMC power module with the dual-bypass switch, and includes:
and , bypassing, namely when the main control board detects that the voltage of the direct current capacitor C reaches th overvoltage set value V1 through a voltage sampling loop, requesting valve control to send a bypass signal through software judgment written in the FPGA of the main control board, sending the bypass signal to the main control board after the valve control is judged to be qualified through logic judgment, sending the bypass signal to a th bypass switch drive board after the main control board receives the bypass signal, and sending a signal to trigger a th bypass switch after the th bypass switch drive board receives the bypass signal so as to bypass the power module.
And a second bypass, wherein when the voltage of the capacitor reaches a second overvoltage set value V2 after the th overvoltage bypass fails due to faults, the voltage at two ends of the capacitor is directly compared and judged with the set value through a hardware detection loop by a main control board, a trigger signal is sent to a th bypass switch driving board, and after the th bypass switch driving board receives the trigger signal, a th bypass switch is triggered to bypass the power module.
And in the third bypass, after both the th overvoltage bypass method and the second overvoltage bypass method fail due to faults, when the capacitor voltage reaches a third section backup protection set value V3, the hardware detection loop of the second bypass switch drive board directly compares and judges the voltage at two ends of the capacitor with the set value V3, and sends a signal to trigger the bypass switch, so that reliable bypass is realized.
Therefore, according to the method, whether the MMC power module is over-voltage or not is judged through the three bypasses, the judgment speed of the next times is higher than that of the last times, the fact that the IGBT of the power module is not controlled can be guaranteed, when the power module is continuously charged, the power module is reliably bypassed, the IGBT and the capacitor are not exploded, the influence on other power modules is avoided, the continuous operation of a flexible and straight system of the MMC converter valve is not influenced, and the reliability of the system is improved
Further , the V1< V2< V3, and V3 is less than the rated voltage value of the IGBT of the MMC power module, preventing the IGBT from breaking down before the second bypass switch closes.
Therefore, compared with the prior art, the invention has the following beneficial effects:
1. by arranging the two bypass switches, the reliability of the bypass of the power module is improved, and the shutdown of the flexible direct-current system caused by the unreliable bypass of the power module is avoided.
2. Two bypass switches are triggered respectively by setting two sets of bypass switch trigger circuits, trigger signals do not influence each other, and reliability of bypass action is improved
3. The second can power of getting compares with can power of getting, and the function is simpler, and components and parts are few, and circuit structure is simpler, and the reliability is higher.
4. Compared with the th bypass switch driving circuit, the second bypass switch driving circuit has simpler functions, fewer components, simpler circuit structure and higher reliability.
5. The second bypass switch protection is the backup protection of the th bypass switch, the closing conditions of the second bypass switch are that the capacitance voltage is higher than the threshold V3, the threshold V3 is lower than the IGBT withstand voltage value, and the IGBT can be effectively protected from being broken down by the capacitance voltage.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (6)
1, MMC power module using double bypass switch, comprising:
when the capacitor voltage of the MMC power module exceeds a set safety value, the bypass switch is closed, so that the MMC power module bypasses;
and when the th bypass switch fails in the MMC power module, the second bypass switch receives a closing instruction, and the second bypass switch is closed, so that the MMC power module is bypassed.
2. The MMC power module employing a dual bypass switch of claim 1, further comprising:
the th bypass switch driving circuit, the th bypass switch driving circuit comprises a main control board, a valve control, a th bypass switch driving board and a th energy-obtaining power supply;
the th energy-taking power supply is used for converting the voltage of the direct current capacitor of the MMC power module into working voltages of the main control board and the bypass switch drive board and supplying power for the work of the main control board and the bypass switch drive board, the main control board is used for detecting the voltage at two ends of the direct current capacitor of the MMC power module, when the voltage reaches a protection value, the main control board sends a bypass request command to the valve control, the valve control sends the bypass command to the main control board after logical judgment and meeting requirements, the main control board sends the bypass command to the bypass switch drive board after receiving the bypass command, and the bypass switch drive board sends a bypass closing command to close the bypass switch so as to cut off the fault power module.
3. The MMC power module with dual bypass switches as claimed in claim 2, wherein the close trigger signal of bypass switch is further sent out by the main control board, the main control board directly detects the voltage across the DC capacitor through its hardware detection loop and compares it with the set value to determine, if it exceeds the set value, then sends out a signal to trigger the bypass switch to close, thus realizing reliable bypass.
4. The MMC power module of any one of claims 1-3 and , employing the dual-bypass switch, further comprising:
a second bypass switch drive circuit, the second bypass switch drive circuit comprising: a second bypass switch drive board and a second energy-taking power supply;
the second energy-obtaining power supply is used for converting the voltage of a direct-current capacitor of the MMC power module into the working voltage of the second bypass switch driving board and only supplying power for the work of the second bypass switch driving board;
the second bypass switch driving board directly detects the voltage at two ends of the direct current capacitor through a hardware detection loop of the second bypass switch driving board, compares the voltage with a set value and judges the voltage, and if the voltage exceeds the set value, a signal is sent to trigger the second bypass switch to be closed, so that reliable bypass is realized.
An MMC power module over-voltage triple-bypass method, wherein the method is performed using the MMC power module of claim 4 employing a dual-bypass switch, comprising:
and , bypassing, namely when the main control board detects that the voltage of the direct current capacitor reaches th overvoltage set value V1 through a voltage sampling loop, requesting valve control to send a bypass signal through software judgment written in the FPGA of the main control board, sending the bypass signal to the main control board after the valve control is judged to be qualified through logic judgment, sending the bypass signal to a th bypass switch drive board after the main control board receives the bypass signal, and sending a signal to trigger a th bypass switch after the th bypass switch drive board receives the bypass signal so as to bypass the power module.
And a second bypass, wherein when the voltage of the capacitor reaches a second overvoltage set value V2 after the th overvoltage bypass fails due to faults, the voltage at two ends of the capacitor is directly compared and judged with the set value through a hardware detection loop by a main control board, a trigger signal is sent to a th bypass switch driving board, and after the th bypass switch driving board receives the trigger signal, a th bypass switch is triggered to bypass the power module.
And in the third bypass, after both the th overvoltage bypass method and the second overvoltage bypass method fail due to faults, when the capacitor voltage reaches a third section backup protection set value V3, the hardware detection loop of the second bypass switch drive board directly compares and judges the voltage at two ends of the capacitor with the set value V3, and sends a signal to trigger the bypass switch, so that reliable bypass is realized.
6. The MMC power module overvoltage triple-bypass method of claim 5, wherein V1< V2< V3, and V3 is less than a voltage rating of an IGBT of the MMC power module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911071912.7A CN110739837B (en) | 2019-11-05 | MMC power module adopting double bypass switches and overvoltage three bypass method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911071912.7A CN110739837B (en) | 2019-11-05 | MMC power module adopting double bypass switches and overvoltage three bypass method |
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| Publication Number | Publication Date |
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| CN110739837A true CN110739837A (en) | 2020-01-31 |
| CN110739837B CN110739837B (en) | 2024-06-28 |
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| CN111641331A (en) * | 2020-05-29 | 2020-09-08 | 南京南瑞继保电气有限公司 | Multiple bypass protection commutation unit submodule and control method thereof, and commutation chain |
| CN111799760A (en) * | 2020-07-02 | 2020-10-20 | 云南电网有限责任公司电力科学研究院 | Modular multilevel converter MMC fault state determination method |
| CN113410980A (en) * | 2020-03-17 | 2021-09-17 | 许继集团有限公司 | Control device for bypass switch of power module in converter valve |
| CN113507204A (en) * | 2021-08-20 | 2021-10-15 | 西安西电电力***有限公司 | Reliable bypass system and method for IGCT-MMC flexible direct-current power transmission converter valve |
| CN113765422A (en) * | 2021-07-19 | 2021-12-07 | 许继集团有限公司 | MMC submodule double-coil bypass switch trigger device |
| CN113777419A (en) * | 2021-07-19 | 2021-12-10 | 许继集团有限公司 | Flexible direct converter valve detection method and device for distribution network |
| CN114094614A (en) * | 2020-08-24 | 2022-02-25 | 许继集团有限公司 | MMC flexible direct-current transmission converter valve submodule bypass switch redundancy control device and method |
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| CN113410980A (en) * | 2020-03-17 | 2021-09-17 | 许继集团有限公司 | Control device for bypass switch of power module in converter valve |
| CN113410980B (en) * | 2020-03-17 | 2022-08-19 | 许继集团有限公司 | Control device for bypass switch of power module in converter valve |
| CN111641331A (en) * | 2020-05-29 | 2020-09-08 | 南京南瑞继保电气有限公司 | Multiple bypass protection commutation unit submodule and control method thereof, and commutation chain |
| CN111799760A (en) * | 2020-07-02 | 2020-10-20 | 云南电网有限责任公司电力科学研究院 | Modular multilevel converter MMC fault state determination method |
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| CN114094614A (en) * | 2020-08-24 | 2022-02-25 | 许继集团有限公司 | MMC flexible direct-current transmission converter valve submodule bypass switch redundancy control device and method |
| CN113765422A (en) * | 2021-07-19 | 2021-12-07 | 许继集团有限公司 | MMC submodule double-coil bypass switch trigger device |
| CN113777419A (en) * | 2021-07-19 | 2021-12-10 | 许继集团有限公司 | Flexible direct converter valve detection method and device for distribution network |
| CN113507204A (en) * | 2021-08-20 | 2021-10-15 | 西安西电电力***有限公司 | Reliable bypass system and method for IGCT-MMC flexible direct-current power transmission converter valve |
| CN113507204B (en) * | 2021-08-20 | 2023-11-24 | 西安西电电力***有限公司 | Reliable bypass system and method for IGCT-MMC flexible direct-current transmission converter valve |
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