CN211089464U - MMC power module adopting double bypass switches - Google Patents
MMC power module adopting double bypass switches Download PDFInfo
- Publication number
- CN211089464U CN211089464U CN201921893173.5U CN201921893173U CN211089464U CN 211089464 U CN211089464 U CN 211089464U CN 201921893173 U CN201921893173 U CN 201921893173U CN 211089464 U CN211089464 U CN 211089464U
- Authority
- CN
- China
- Prior art keywords
- bypass switch
- bypass
- power module
- voltage
- control board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Power Conversion In General (AREA)
Abstract
The utility model discloses an MMC power module adopting a double bypass switch and an overvoltage three-bypass method, wherein the MMC power module adopting the double bypass switch comprises a first bypass switch which is connected in parallel at two ends of the MMC power module; when the capacitance voltage of the MMC power module exceeds a set safety value, the first bypass switch is closed, so that the MMC power module bypasses; and when the first bypass switch fails to operate at 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 utility model discloses a set up two bypass switches, improved the reliability of power module bypass, avoid the gentle straight system that causes because of power module can not rely on the bypass to shut down the operation.
Description
Technical Field
The utility model relates to an electric power tech field, concretely relates to adopt two bypass switch's MMC power module.
Background
With the development of a high-power flexible direct-current transmission technology, a Modular Multilevel Converter (MMC) is increasingly applied to engineering, and has the advantages of low switching frequency, low loss, flexibility in control and the like. Every bridge arm of this kind of form converter valve has hundreds of power module to establish ties, every power module can adopt full-bridge structure or half-bridge structure, when because get can the power or control integrated circuit board and break down, when power module becomes uncontrollable state, the electric capacity in the operation can be by continuous charging, when electric capacity both ends voltage is too high, can lead to connecting in parallel the IGBT power device breakdown at electric capacity both ends, because the IGBT that uses in the engineering at present is open circuit state after the breakdown, consequently the MMC of establishing ties on the bridge arm in case the IGBT breaks down after, can lead to the converter valve shutting, influence the stability of flexible direct current transmission engineering power transmission.
The existing method is to connect a bypass switch in parallel at two ends of a power module, but the parallel bypass switch also has the risk of action rejection due to reasons of energy taking, communication, control and the like, and a reliable bypass of the power module cannot be realized. The control logic of the current parallel bypass switch is that an energy-taking power supply takes energy through voltages 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 a power module through optical fibers, the main control board communicates with the bypass switch drive board through optical fibers, when the power module is in fault, the main control board judges that the capacitor voltage signal is overhigh, applies for valve control to issue a bypass command, after the valve control receives the request signal, and finally, the bypass switch driving board sends out a trigger command to trigger the bypass switch, so that the bypass switch is switched on, and the fault power module is cut off. Therefore, when any link has a problem, such as an optical fiber communication fault, a main control board fault and an energy-taking power supply fault, the bypass switch fails to operate when the power module fails, and finally the converter valve trips to influence the normal operation of the converter valve.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide an MMC power module who adopts two bypass switches to improve the reliability of power module bypass, avoid because of the gentle straight system that the bypass caused is not reliable to the power module to shut down.
In order to achieve the above purpose, the technical scheme of the utility model is that:
an MMC power module employing a dual bypass switch, comprising:
the first bypass switch is connected in parallel with two ends of the MMC power module; when the capacitance voltage of the MMC power module exceeds a set safety value, the first bypass switch is closed, so that the MMC power module bypasses;
and when the first bypass switch fails to operate at 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.
Further, the MMC power module using the dual bypass switch further includes:
a first bypass switch drive circuit, the first bypass switch drive circuit comprising: the energy-saving control system comprises a main control board, a valve control board, a first bypass switch driving board and a first energy-taking power supply;
the first energy-obtaining power supply is used for converting the voltage of a direct-current capacitor of the MMC power module into working voltages of the main control board and the bypass switch driving board and supplying power for the work of the main control board and the bypass switch driving board; the main control board is used for detecting voltages at two ends of a direct current capacitor of the MMC power module, when the voltages reach a protection value, the main control board sends a bypass request command to the valve control board, the valve control board sends the bypass command to the main control board after logical judgment according to 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 closed bypass switch command to close the bypass switch and cut off a fault power module.
Furthermore, a closing trigger signal of the first bypass switch is sent out through a 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, a signal is sent to trigger the first bypass switch to be closed, so that reliable bypass is realized.
Further, the MMC power module using the dual bypass switch further includes:
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 utility model also provides a three bypass methods of MMC power module excessive pressure, the method adopts foretell MMC power module who adopts two bypass switches to go on, include:
a first bypass: when the main control board detects that the voltage of the direct current capacitor reaches a first overvoltage set value V1 through the voltage sampling loop, the main control board requests valve control to issue a bypass signal through software judgment written in the FPGA of the main control board, the valve control issues the bypass signal to the main control board after being judged to be qualified through logic, the main control board issues the bypass signal to the first bypass switch driving board after receiving the bypass signal, and after receiving the bypass signal, the main control board sends a signal to trigger the first bypass switch to enable the power module to bypass.
A second bypass: after the first overvoltage bypass fails due to faults, when the voltage of the capacitor reaches a second overvoltage set value V2, the voltage at two ends of the capacitor is directly compared and judged with the set value through the main control board through the hardware detection loop, a trigger signal is sent to the first bypass switch driving board, and after the first bypass switch driving board receives the trigger signal, the first bypass switch is triggered, so that the power module bypasses.
And in the third bypass, after the first and second overvoltage bypass methods are both failed 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 a set value V3, and a signal is sent to trigger the bypass switch, so that reliable bypass is realized.
Further, V1< V2< V3, and V3 is smaller than the rated voltage value of the IGBT of the MMC power module.
Compared with the prior art, the utility model, its beneficial effect lies in:
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 first 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 first bypass switch driving circuit, the second bypass switch driving circuit has simpler functions, fewer components, simpler circuit structure and higher reliability. The second bypass switch circuit only adopts a hardware circuit to carry out logic judgment, and the bypass logic link is shorter and has higher reliability.
5. The second bypass switch protection is the backup protection of the first bypass switch, the closing condition of the second bypass switch is that the capacitance voltage is higher than a threshold value V3, the threshold value 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: 10, a main control board; 11. valve control; 12. a first bypass switch drive board; 13. a first energy-taking power supply; 20. a second bypass switch drive plate; 21. and a second energy-taking power supply.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example (b):
referring to fig. 1-2, the MMC power module using the dual bypass switch provided in this embodiment includes a first bypass switch K1 and a second bypass switch K2.
The first bypass switch K1 is connected in parallel at two ends of the MMC power module; when the voltage of the capacitor C of the MMC power module exceeds a set safety value, a first bypass switch K1 is closed, so that the MMC power module is bypassed; when the first bypass switch K1 refuses the MMC power module due to fault, the second bypass switch receives a closing instruction, and the second bypass switch is closed, so that the MMC power module is bypassed.
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 switch further includes a first bypass switch driving circuit, where the first bypass switch driving circuit includes a main control board 10, a valve control 11, a first bypass switch driving board 12, and a first energy-obtaining power supply 13; the working power supply voltage of the main control board 10 is 15V and is supplied by the first energy-obtaining power supply 13, and the working power supply voltage of the first bypass switch driving board 12 is 400V and is supplied by the first energy-obtaining power supply 13. For the first bypass switch K1, the main control board 10 detects the voltage across the dc capacitor C of the power module, 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 the bypass command to the main control board 10 after logic judgment and meeting the requirement, the main control board 10 sends the bypass command to the first bypass switch drive board 12 after receiving the bypass command, the first bypass switch drive board 12 sends a command to close the first bypass switch, so that the first bypass switch K1 is closed, and the failed power module is cut off.
Preferably, the closing signal of the first bypass switch K1 is further obtained by: 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 first bypass switch K1 to be closed, so that a reliable bypass is realized. In this way, the triggering action of the signal is quicker without logical judgment through valve control, so as to further improve the reliability of the system.
Optionally, the MMC power module using the dual bypass switch further includes a second bypass switch driving circuit, where 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 supply 21 is used for converting the voltage of the direct-current capacitor C into 400V to supply power to the second bypass switch drive board 20, when the first bypass switch K1 fails and refuses the power module, the voltage of the capacitor C rises to a backup protection value, the second bypass switch drive board 20 adopts a hardware circuit, the voltage at two ends of the direct-current capacitor C is directly collected, and a command for closing the second bypass switch is sent out through judgment of the comparator. That is to say, the driving circuit of the second bypass switch is less than the driving circuit of the first bypass switch, the function is more single, only the hardware circuit is adopted for logic judgment, the bypass logic link is shorter, the reliability is higher, and the system reliability is further improved. Meanwhile, the second energy-obtaining power supply 21 only functions to convert the voltage of the dc capacitor into 400V to supply power to the second bypass switch driving board 21, while the first energy-obtaining power supply 13 functions to convert the voltage of the dc capacitor C into 400V and 15V, the 400V voltage supplies power to the first bypass switch driving board 12, and the 15V voltage supplies power to the main control board 10 and the IGBT driving board. Compared with the first energy taking power supply 13, the second energy taking power supply 21 has simpler functions, fewer components, simpler circuit structure and higher reliability.
Correspondingly, the embodiment also provides an MMC power module overvoltage three-bypass method, which is performed by using the MMC power module with the double-bypass switch, and includes:
a first bypass: when the main control board detects that the voltage of the direct current capacitor C reaches a first overvoltage set value V1 through the voltage sampling loop, the main control board requests valve control to issue a bypass signal through software judgment written in the FPGA of the main control board, the valve control issues the bypass signal to the main control board after being judged to be qualified through logic, the main control board issues the bypass signal to the first bypass switch driving board after receiving the bypass signal, and after receiving the bypass signal, the main control board sends a signal to trigger the first bypass switch to enable the power module to bypass.
A second bypass: after the first overvoltage bypass fails due to faults, when the voltage of the capacitor reaches a second overvoltage set value V2, the voltage at two ends of the capacitor is directly compared and judged with the set value through the main control board through the hardware detection loop, a trigger signal is sent to the first bypass switch driving board, and after the first bypass switch driving board receives the trigger signal, the first bypass switch is triggered, so that the power module bypasses.
And in the third bypass, after the first and second overvoltage bypass methods are both failed 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 a set value V3, and a signal is sent 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 three bypasses, the next judgment speed is higher than that of the previous judgment speed, 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 smaller 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 utility model, have following beneficial effect:
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 first 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 first bypass switch driving circuit, the second bypass switch driving circuit has simpler functions, fewer components, simpler circuit structure and higher reliability. The second bypass switch circuit only adopts a hardware circuit to carry out logic judgment, and the bypass logic link is shorter and has higher reliability.
5. The second bypass switch protection is the backup protection of the first bypass switch, the closing condition of the second bypass switch is that the capacitance voltage is higher than a threshold value V3, the threshold value 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 to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (4)
1. An MMC power module employing a dual bypass switch, comprising:
the first bypass switch is connected in parallel with two ends of the MMC power module; when the capacitance voltage of the MMC power module exceeds a set safety value, the first bypass switch is closed, so that the MMC power module bypasses;
and when the first bypass switch fails to operate at 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:
a first bypass switch drive circuit, the first bypass switch drive circuit comprising: the energy-saving control system comprises a main control board, a valve control board, a first bypass switch driving board and a first energy-taking power supply;
the first energy-obtaining power supply is used for converting the voltage of a direct-current capacitor of the MMC power module into working voltages of the main control board and the bypass switch driving board and supplying power for the work of the main control board and the bypass switch driving board; the main control board is used for detecting voltages at two ends of a direct current capacitor of the MMC power module, when the voltages reach a protection value, the main control board sends a bypass request command to the valve control board, the valve control board sends the bypass command to the main control board after logical judgment according to 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 closed bypass switch command to close the bypass switch and cut off a fault power module.
3. The MMC power module with dual bypass switches as claimed in claim 2, wherein the close trigger signal of the first bypass switch is further sent by the main control board, the main control board directly detects the voltage across the DC capacitor through its hardware detection circuit and compares the voltage with the set value for judgment, if the voltage exceeds the set value, a signal is sent to trigger the first bypass switch to close, thereby realizing reliable bypass.
4. The MMC power module employing a dual bypass switch of any of claims 1-3, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921893173.5U CN211089464U (en) | 2019-11-05 | 2019-11-05 | MMC power module adopting double bypass switches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921893173.5U CN211089464U (en) | 2019-11-05 | 2019-11-05 | MMC power module adopting double bypass switches |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211089464U true CN211089464U (en) | 2020-07-24 |
Family
ID=71630456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921893173.5U Active CN211089464U (en) | 2019-11-05 | 2019-11-05 | MMC power module adopting double bypass switches |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211089464U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2019
- 2019-11-05 CN CN201921893173.5U patent/CN211089464U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110739837B (en) * | 2019-11-05 | 2024-06-28 | 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110739837B (en) | MMC power module adopting double bypass switches and overvoltage three bypass method | |
| CN111049367B (en) | Reliable bypass device and method for flexible direct current transmission power unit | |
| CN104682431B (en) | Self-starting method and self-starting system of energy storage converter | |
| CN109066798A (en) | A kind of cutoff device of photovoltaic module | |
| EP3352357A1 (en) | Fault protection method and device for sub-modules of modular multilevel converter | |
| CN110829811A (en) | MMC power module overvoltage protection circuit and multistage bypass method | |
| CN110474550A (en) | A kind of striding capacitance type NPC three-level topology | |
| CN105576952B (en) | STO control circuits and system | |
| CN111942177A (en) | ASC control device and motor controller | |
| CN211089464U (en) | MMC power module adopting double bypass switches | |
| CN109347313A (en) | Bypass module for high voltage transducer power unit | |
| CN107154632B (en) | A kind of recognition methods of power unit by-pass state | |
| CN209844635U (en) | Intelligent redundant power supply conversion device | |
| CN105591362A (en) | Safety protection circuit of blade electric vehicle motor | |
| CN101767588A (en) | Vehicle launch control system and control method | |
| CN105262138B (en) | A kind of photovoltaic module optimizer | |
| CN102769336B (en) | Single-phase inverter for emergency power supply | |
| CN112583242B (en) | Redundant energy taking circuit of power module bypass switch and control method thereof | |
| CN103490499A (en) | Uninterrupted power supply method with power module and battery combined | |
| CN110474299A (en) | A kind of the bypass condition circulation report method and topological structure of power cell | |
| CN110504734A (en) | Electrolytic capacitor charge control method, device and the frequency converter of frequency converter | |
| CN101710695A (en) | Wave-following current-limiting method and device of switching tube of uninterruptible power supply | |
| CN101728837A (en) | Energy feedback system | |
| CN113410980B (en) | Control device for bypass switch of power module in converter valve | |
| CN112564518B (en) | Power module with self-protection function and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |