CN117318458A - Bypass device and method for IGCT-MMC power module - Google Patents
Bypass device and method for IGCT-MMC power module Download PDFInfo
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- CN117318458A CN117318458A CN202311001388.2A CN202311001388A CN117318458A CN 117318458 A CN117318458 A CN 117318458A CN 202311001388 A CN202311001388 A CN 202311001388A CN 117318458 A CN117318458 A CN 117318458A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004146 energy storage Methods 0.000 claims description 37
- 239000003990 capacitor Substances 0.000 claims description 33
- 238000004891 communication Methods 0.000 claims description 18
- 239000013307 optical fiber Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 10
- 230000001960 triggered effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 description 8
- 230000006872 improvement Effects 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 101150055297 SET1 gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- 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
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses an IGCT-MMC power module bypass device and a method, which belong to the field of bypass of a power transmission IGCT converter valve, and the device comprises: a bypass switch, a bypass drive plate and a BOD plate; the bypass switch comprises a first coil and a second coil, the bypass switch is closed by triggering the first coil by the bypass driving plate, the bypass switch is closed by triggering the second coil by the BOD plate, the bypass switch is used for closing or opening a bypass circuit, and the bypass circuit is used for bypassing the IGCT-MMC power module. When the IGCT-MMC power module fails, the bypass switch is controlled to be closed through the bypass drive or the BOD board. By arranging two coils on the bypass switch, when one coil fails in control, the bypass switch can be continuously controlled to be closed through the other coil, so that reliable bypass of the IGCT-MMC power module is ensured, and reliable power transmission of the converter valve based on the IGCT-MMC power module is ensured.
Description
Technical Field
The invention belongs to the field of IGCT converter valve power transmission bypasses, and particularly relates to an IGCT-MMC power module bypass device and method.
Background
The flexible high-voltage direct current transmission technology (MMC based high voltage direct current, MMC-HVDC) based on the modularized multi-level converter (modular multilevelconverter, MMC) has the advantages of independent adjustment of active power and reactive power, low output voltage harmonic content, capability of connecting a weak power grid with a passive network and the like, and is widely applied to the fields of alternating current power grid asynchronous interconnection, distributed energy grid connection, direct current power grid and the like in recent years. Compared with an IGBT device, the IGCT device has the advantages of high reliability, strong current capacity, high voltage resistance, low conduction loss and long-term current after failure and short circuit, and the di/dt tolerance of the device is low, but the di/dt tolerance problem can be solved by configuring a buffer and absorption loop, so that the IGCT device can be applied to the field of high-voltage high-capacity flexible direct current transmission.
The existing bypass is carried out when the IGCT-MMC power module fails so as to ensure the safety of the IGCT-MMC power module and the converter valve based on the IGCT-MMC power module can stably transmit power. The existing bypass method is to detect whether a power module has a fault or not, and drive a bypass circuit to be closed to realize bypass when the fault exists, but the bypass is realized by triggering a bypass switch of the bypass circuit to be closed through a driving piece, the existing bypass switch is generally triggered to realize the closing of the bypass switch by triggering a corresponding coil, and the existing coil triggering method is easy to cause the condition of triggering failure, so that the bypass is failed and the problem of unreliable bypass is caused.
In summary, the existing method for closing the bypass switch through the trigger coil has the problem of unreliable bypass.
Disclosure of Invention
The invention aims to provide an IGCT-MMC power module bypass device and method, which are used for solving the problem that the bypass is unreliable in the existing method for realizing the closing of a bypass switch through a trigger coil in the prior art.
In order to achieve the above purpose, the technical scheme of the bypass device and the method for the IGCT-MMC power module provided by the invention is as follows:
the bypass device of the IGCT-MMC power module comprises a bypass switch for bypassing the IGCT-MMC power module and two trigger coils for triggering the bypass switch, wherein the two trigger coils are a first coil and a second coil respectively, the first coil is in control connection with a bypass driving plate, the second coil is in control connection with a BOD plate, the bypass driving plate triggers the first coil according to an IGCT-MMC power module fault signal, and the BOD plate triggers the second coil according to an IGCT-MMC power module fault signal or a BOD plate energy storage capacitor voltage fault signal.
The beneficial effects are that: the central control board is used for detecting the operation state of the IGCT-MMC power module, and when a fault state is detected, the bypass switch is controlled to be closed through the bypass drive or the BOD board. By arranging two coils on the bypass switch, when one coil fails in control, the bypass switch can be continuously controlled to be closed through the other coil, so that reliable bypass of the IGCT-MMC power module is ensured, and reliable power transmission of the converter valve based on the IGCT-MMC power module is ensured.
As a further improvement, the BOD board comprises an active driving module, a passive driving module and an energy storage capacitor module, wherein the active driving module is used for triggering the second coil according to a fault signal of the IGCT-MMC power module, and the passive driving module is used for triggering the second coil according to a voltage fault signal of the energy storage capacitor.
The beneficial effects are that: in order to avoid the condition that the second coil is triggered to fail when the active BOD trigger circuit fails, a passive BOD trigger circuit is arranged, and the reliability of the bypass is ensured.
As a further improvement, the BOD plate also comprises an optical fiber communication module and an energy storage module; the active driving module is used for acquiring fault signals of the IGCT-MMC power module from the central control board through the optical fiber communication module, the acquired fault signals trigger the second coil to form an active BOD loop, and the energy storage module provides electric energy for the active BOD loop.
The beneficial effects are that: and the second coil is triggered according to the fault signal of the IGCT-MMC power module acquired by the central control board in the active BOD loop, so that the bypass switch is closed, the IGCT-MMC power module bypasses, and the safety of the IGCT-MMC power module is ensured.
As a further improvement, the BOD board further comprises a capacitor voltage detection module; the capacitor voltage detection module is used for detecting a voltage signal of the energy storage capacitor, and the active driving module triggers the second coil through the voltage fault signal obtained by the capacitor voltage detection module to form a passive BOD loop; the energy storage capacitor is connected to the power supply circuit of the energy storage module to charge, and the energy storage capacitor discharges to provide electric energy for the passive BOD circuit.
The beneficial effects are that: in order to avoid the failure of the active BOD loop, a capacitor device is arranged, so that the loop which can provide a closed action for the bypass switch when the active BOD loop fails is ensured, and the BOD plate is ensured to stably realize the bypass. Because the passive BOD loop is powered by the energy storage capacitor, the energy storage capacitor is connected to the power supply loop of the active BOD loop for charging, when the power supply loop of the active BOD loop fails, the energy storage capacitor discharges, and the passive BOD loop is powered. When the active BOD loop fails, the passive BOD loop can be started according to signals, and the reliability of the bypass is guaranteed.
As a further improvement, the side-opening driving plate comprises an optical fiber communication module, an energy storage module and a side-opening driving; the optical fiber communication module is used for acquiring fault signals of the IGCT-MMC power module from the central control board, the bypass driving triggers the first coil according to the signals acquired by the optical fiber communication module, and the energy storage module provides electric energy for the bypass driving board.
The beneficial effects are that: the bypass driving board acquires fault signals of the IGCT-MMC power module according to the central control board, so that the bypass driving triggers the first coil, the bypass switch is closed, and the bypass driving board is ensured to stably realize bypass.
As a further improvement, the system also comprises an energy taking power supply and a redundant power supply, wherein the redundant power supply is used for starting when the energy taking power supply fails; the energy-taking power supply supplies power to the energy storage module of the bypass driving plate, and the redundant power supply supplies power to the energy storage module of the BOD plate through the energy-taking voltage dividing circuit.
The beneficial effects are that: the energy-taking power supply supplies power to the energy storage module of the side-opening driving plate, and the redundant power supply supplies power to the energy storage module of the BOD plate through the energy-taking voltage dividing circuit, namely, the redundant power supply supplies power to the active BOD loop. The redundant power supply is used for starting when the energy taking power supply fails; when a fault signal exists, the first coil is controlled to trigger, and then the second coil is controlled to trigger.
The invention also provides an IGCT-MMC power module bypass method, which is realized by the IGCT-MMC power module bypass device, and comprises the following steps: according to the fault signal of the IGCT-MMC power module, the bypass driving plate is controlled to trigger the first coil to close the bypass switch; and detecting whether the bypass switch is closed successfully, and if the bypass switch is closed successfully, controlling the BOD board to trigger the second coil to close the bypass switch.
The beneficial effects are that: two circuits for driving the bypass switch to be closed are designed for the bypass IGCT-MMC power module, and after one control fails, the other circuit is started. The specific line is that the fault signal of the IGCT-MMC power module causes the bypass driving plate to trigger the first coil to close the bypass switch; the other is that the fault signal of the IGCT-MMC power module controls the BOD board to trigger the second coil to close the bypass switch. The two lines ensure reliable bypass of the IGCT-MMC power module and ensure reliable power transmission of the converter valve based on the IGCT-MMC power module.
As a further improvement, when the BOD loop is controlled to trigger the second coil, the active BOD loop is controlled to trigger the second coil, and when the triggering fails, the passive BOD loop is controlled to trigger the second coil according to the voltage fault signal of the energy storage capacitor.
The beneficial effects are that: after the active BOD loop control fails, the passive BOD loop is controlled to trigger the second coil. And the power transmission failure of the converter valve caused by the failure of the bypass IGCT-MMC power module after the failure of the active BOD loop control is avoided. Thereby ensuring the stable performance of the bypass process.
Drawings
FIG. 1 is a schematic diagram of a turning IGCT-MMC power module-based power module and an IGCT-MMC power module-based power module bypass device of the present invention;
FIG. 2 is a functional logic block diagram of an IGCT-MMC power module central control board of the IGCT-MMC power module bypass device of the present invention;
FIG. 3 is a functional logic block diagram of an IGCT-MMC power module bypass driver board of the IGCT-MMC power module bypass device of the present invention;
FIG. 4 is a functional block diagram of an IGCT-MMC power module BOD board of the IGCT-MMC power module bypass device of the present invention;
FIG. 5 is a schematic flow chart of the IGCT-MMC power module bypass method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
IGCT-MMC power module bypass device embodiment:
an IGCT-MMC power module bypass device is used for enabling bypass to be carried out when an IGCT-MMC power module of a converter valve fails, so that the effect of protecting the IGCT-MMC power module is achieved.
The device comprises a bypass switch bypassing the IGCT-MMC power module as shown in fig. 1-3 and a trigger coil for triggering the bypass switch; the bypass switch comprises a first coil and a second coil, the bypass driving plate is in control connection with the first coil, the BOD plate is in control connection with the second coil, the bypass switch is used for closing or opening a bypass circuit, and the bypass circuit is used for bypass connecting with the IGCT-MMC power module; the central control board is used for detecting the operation state of the IGCT-MMC power module, and when a fault state is detected, the bypass switch is closed by controlling the corresponding first coil or second coil through the bypass drive or BOD board. Wherein, the two coils of bypass switch mutually independent, each other do not influence.
As shown in fig. 4, the BOD board includes an active BOD loop and a passive BOD loop.
The BOD board comprises an optical fiber communication module, an energy storage module and a bypass driver; the optical fiber communication module is used for acquiring fault signals of the IGCT-MMC power module from the central control board, the bypass driver triggers the second coil according to the signals acquired by the optical fiber communication module to form an active BOD loop, and the energy storage module supplies electric energy for the active BOD loop.
The BOD board also comprises a capacitor voltage detection module; the energy storage capacitor is connected to the power supply loop of the energy storage module for charging, the capacitor voltage detection module is used for detecting the voltage of the energy storage capacitor, the bypass drive is used for triggering the second coil when the detected voltage exceeds the first voltage threshold value, a passive BOD loop is formed, and the energy storage capacitor is discharged to provide electric energy for the passive BOD loop.
The central control board comprises an energy taking power supply and a redundant power supply, wherein the energy taking power supply is used for supplying power to the bypass drive, the redundant power supply is used for supplying power to the active BOD loop, and the capacitor is used for supplying power to the passive BOD loop; the redundant power supply is used for starting after the energy-taking power supply fails, and the capacitor is used for discharging after the redundant power supply fails.
Specifically, the central control board comprises an optical fiber communication module for realizing communication connection; the system also comprises a main control chip for realizing control of bypass driving or BOD board. The central control board optical fiber communication module comprises communication with a valve control device, bypass switch driving and BOD driving, the AD sampling module is responsible for capacitor voltage acquisition, the IGCT driving control module is responsible for communication with driving, the bypass switch driving module is responsible for driving the bypass switch driving board to close the bypass switch, the energy taking power supply voltage monitoring module is responsible for power supply voltage monitoring, the redundant power supply module is responsible for supplying power to the central control board, the redundant power supply module does not work when the energy taking power supply is normal, and the redundant power supply module supplies power to the central control board when the energy taking power supply works abnormally; the energy storage capacitor of the bypass driving plate is powered by an energy-taking power supply, and the bypass switch is closed by receiving a control signal of the central control plate to drive the first coil of the bypass switch; the bypass driving module of the passive BOD loop does not depend on the drive signal of the central control board, and drives the bypass switch to be closed after directly detecting that the capacitor voltage reaches the action fixed value uset2+/-delta U2, and the bypass driving module of the passive BOD loop can drive the bypass switch to be closed only after receiving the drive signal of the central control board.
The power module also comprises turning IGCT devices connected in parallel at two ends of the power module, wherein the turning IGCT devices comprise an overvoltage breakdown module and a detection voltage module; the detection voltage module is used for detecting voltage data of the IGCT-MMC power module, and when the voltage data exceeds a second voltage threshold value, the control voltage breakdown module breaks down the turning IGCT device, so that the turning IGCT shorts the power module, and a power module bypass is realized. Specifically, the voltage between anode and cathode of the IGCT reaches U set1 ±ΔU 1 After voltage, the IGCT device actively breaks down bypassing the IGCT-MMC power module.
As shown in fig. 5, the steps of the method for realizing IGCT-MMC power module bypass by the IGCT-MMC power module bypass device are as follows:
firstly, the medium control acquires voltage data of an IGCT-MMC power unit, and when the voltage data exceeds a first voltage threshold value, the power unit is judged to be faulty, and then the bypass driving plate is controlled to trigger the first coil to enable the bypass switch to be closed; and detecting whether the bypass switch is closed successfully, and if the bypass switch is closed successfully, controlling the BOD board to trigger the second coil to close the bypass switch.
When the BOD loop is controlled to trigger the second coil, the active BOD loop is controlled to trigger the second coil, and when the trigger fails, the passive BOD loop is controlled to trigger the second coil.
When the bypass switch cannot be closed by the control circuit, the fault voltage can be gradually increased, and when the voltage triggering the breakdowns of the turning IGCT device is reached, the overvoltage breakdown module breaks down the turning IGCT device, so that the circuit where the turning IGCT device is located is short-circuited, namely the circuit where the turning IGCT device is located is equivalent to the bypass circuit, and the bypass IGCT-MMC power module is realized. When the voltage data exceeds a second voltage threshold, the voltage breakdown module is controlled to break down the turning IGCT device, so that the turning IGCT short-circuits the power module, and a power module bypass is realized; wherein the second voltage threshold is greater than the first voltage threshold. The current of the power transmission circuit flows through the IGCT device after short circuit.
IGCT-MMC power module bypass method embodiment:
as shown in fig. 5, the IGCT-MMC power module bypass method includes the steps of: the medium control acquires voltage data of the IGCT-MMC power unit, and when the voltage data exceeds a first voltage threshold value, the power unit is judged to be faulty, and then the bypass driving plate is controlled to trigger the first coil to enable the bypass switch to be closed; and detecting whether the bypass switch is closed successfully, and if the bypass switch is closed successfully, controlling the BOD board to trigger the second coil to close the bypass switch. The method is implemented by the above-mentioned IGCT-MMC power module bypass device embodiment, and the specific implementation refers to the above-mentioned IGCT-MMC power module bypass device embodiment, which is not described herein again.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, but may be modified without inventive effort or equivalent substitution of some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The bypass device of the IGCT-MMC power module comprises a bypass switch for bypassing the IGCT-MMC power module and a trigger coil for triggering the bypass switch, and is characterized in that the bypass switch is two, namely a first coil and a second coil, the first coil is controlled and connected by a bypass driving plate, the second coil is controlled and connected with a BOD (on-demand) plate, the bypass driving plate triggers the first coil according to an IGCT-MMC power module fault signal, and the BOD plate triggers the second coil according to an IGCT-MMC power module fault signal or a BOD plate energy storage capacitor voltage fault signal.
2. The IGCT-MMC power module bypass device of claim 1, wherein the BOD board comprises an active drive module for triggering the second coil in accordance with a fault signal of the IGCT-MMC power module, a passive drive module for triggering the second coil in accordance with a voltage fault signal of the storage capacitor, and a storage capacitor module.
3. The IGCT-MMC power module bypass device of claim 2, wherein the BOD board further comprises an optical fiber communication module, an energy storage module; the active driving module is used for acquiring fault signals of the IGCT-MMC power module from the central control board through the optical fiber communication module, the acquired fault signals trigger the second coil to form an active BOD loop, and the energy storage module provides electric energy for the active BOD loop.
4. An IGCT-MMC power module bypass device as claimed in claim 3, characterized in that the BOD board further comprises a capacitive voltage detection module; the capacitor voltage detection module is used for detecting a voltage signal of the energy storage capacitor, and the active driving module triggers the second coil through the voltage fault signal obtained by the capacitor voltage detection module to form a passive BOD loop; the energy storage capacitor is connected to the power supply circuit of the energy storage module to charge, and the energy storage capacitor discharges to provide electric energy for the passive BOD circuit.
5. An IGCT-MMC power module bypass device as claimed in claim 3, wherein the bypass drive plate comprises an optical fiber communication module, an energy storage module and a bypass drive; the optical fiber communication module is used for acquiring fault signals of the IGCT-MMC power module from the central control board, the bypass driving triggers the first coil according to the signals acquired by the optical fiber communication module, and the energy storage module provides electric energy for the bypass driving board.
6. An IGCT-MMC power module bypass device as recited in claim 5, further comprising an energy-taking power supply and a redundant power supply, the redundant power supply being configured to be activated upon failure of the energy-taking power supply;
the energy-taking power supply supplies power for the energy storage module of the side-opening driving plate, and the redundant power supply supplies power for the energy storage module of the BOD plate through the energy-taking voltage dividing circuit.
7. An IGCT-MMC power module bypass method, characterized in that the method is implemented by an IGCT-MMC power module bypass device as claimed in any one of claims 1-6, the method comprising the steps of: according to the fault signal of the IGCT-MMC power module, the bypass driving plate is controlled to trigger the first coil to close the bypass switch; and detecting whether the bypass switch is closed successfully, and if the bypass switch is closed successfully, controlling the BOD board to trigger the second coil to close the bypass switch.
8. The IGCT-MMC power module bypass method of claim 7, wherein when the second coil is triggered by the BOD loop, the second coil is triggered by the active BOD loop, and when the triggering fails, the second coil is triggered by the passive BOD loop according to a voltage fault signal of the storage capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311001388.2A CN117318458A (en) | 2023-08-09 | 2023-08-09 | Bypass device and method for IGCT-MMC power module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311001388.2A CN117318458A (en) | 2023-08-09 | 2023-08-09 | Bypass device and method for IGCT-MMC power module |
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| CN117318458A true CN117318458A (en) | 2023-12-29 |
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| CN202311001388.2A Pending CN117318458A (en) | 2023-08-09 | 2023-08-09 | Bypass device and method for IGCT-MMC power module |
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| US20190131885A1 (en) * | 2017-11-02 | 2019-05-02 | Siemens Aktiengesellschaft | Submodule and electrical arrangement having submodules |
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| CN114243746A (en) * | 2021-12-17 | 2022-03-25 | 特变电工西安柔性输配电有限公司 | Redundancy bypass circuit of flexible direct current power module |
| CN114520586A (en) * | 2020-11-18 | 2022-05-20 | 许继集团有限公司 | Bypass switch refusing non-tripping submodule and converter valve thereof |
| CN115425830A (en) * | 2022-09-19 | 2022-12-02 | 特变电工新疆新能源股份有限公司 | Straight-through protection circuit of gentle straight IGCT power module |
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2023
- 2023-08-09 CN CN202311001388.2A patent/CN117318458A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20190131885A1 (en) * | 2017-11-02 | 2019-05-02 | Siemens Aktiengesellschaft | Submodule and electrical arrangement having submodules |
| CN110323931A (en) * | 2019-08-15 | 2019-10-11 | 荣信汇科电气技术有限责任公司 | A kind of redundancy trigger circuit comprising state feedback function |
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| CN115425830A (en) * | 2022-09-19 | 2022-12-02 | 特变电工新疆新能源股份有限公司 | Straight-through protection circuit of gentle straight IGCT power module |
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