CN111049367B - Reliable bypass device and method for flexible direct current transmission power unit - Google Patents
Reliable bypass device and method for flexible direct current transmission power unit Download PDFInfo
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- CN111049367B CN111049367B CN201911404410.1A CN201911404410A CN111049367B CN 111049367 B CN111049367 B CN 111049367B CN 201911404410 A CN201911404410 A CN 201911404410A CN 111049367 B CN111049367 B CN 111049367B
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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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- 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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- 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]
Abstract
A reliable bypass device and a bypass method for a flexible direct current transmission power unit are disclosed, wherein the device comprises a bypass contactor, an energy-taking power supply, a trigger board, a core control board, a redundant trigger module and a drive module; the method is a multi-stage bypass strategy, and comprises a first stage: the bypass trigger plate triggers the bypass switch; and a second stage: an adjacent sub-module bypass switch; and a third stage: the voltage comparator triggers the bypass switch and the fourth stage: the driving module passive active clamping circuit triggers the IGBT to fail, all levels of bypass measures reasonably set the threshold value, and the voltage threshold value and the logic are mutually matched. It is emphasized that the multi-level bypass redundancy measure can also effectively solve the problem of "black module" occurring in the power-on and operation processes, and can acquire the status message of the sub-module through the redundancy trigger module and the adjacent power unit, and can also trigger the bypass in time. It is ensured that the faulty submodule can provide a long-term reliable current path under any extreme operating conditions.
Description
Technical Field
The invention relates to the technical field of data transmission of a flexible direct-current power transmission converter valve, in particular to a reliable bypass device and a reliable bypass method of a flexible direct-current power transmission power unit.
Background
The flexible direct current transmission and conversion technology is rapidly developed in recent years, the voltage grade and the capacity of the flexible direct current transmission and conversion technology are continuously improved, the application field is also developed from a power distribution network to a backbone network, and the flexible direct current transmission and conversion technology is widely applied to the fields of new energy grid connection of large-scale wind power plants and the like, large-scale long-distance transmission of electric energy, asynchronous interconnection of power grids and the like. Due to the improvement of the transmission capacity, the reliability of the flexible direct current transmission equipment directly influences the safe and stable operation of the power system, the flexible direct current transmission converter valve is the core equipment of the whole transmission system, and each bridge arm of the converter valve is generally formed by connecting half-bridge power units or full-half-bridge power units in series, namely, a modular multilevel topology. In engineering, because the direct-current voltage level is high, each bridge arm is generally formed by cascading hundreds of power modules, thousands of power modules are needed for the whole converter valve, and the failure probability of individual power modules is relatively high.
When a sub-module has a fault, an internal bypass switch is generally triggered to be switched on, but besides a conventional fault working condition, under severe working conditions such as abnormal energy-taking power supply and refused action of the bypass switch, the bypass switch cannot be switched on due to failure of a trigger circuit or failure of a body, and at the moment, extra measures are required to be taken to provide a standby long-term through-flow path so as to ensure that the designed converter valve does not have any sub-module fault to cause the whole system to be locked or shut down. In contrast, the bypass device described in chinese patent "power bypass control device for a flexible direct current converter valve" of publication No. CN109390965A can ensure that the IGBT device of the power unit is reliably turned off before the bypass switch acts, thereby protecting the safety of the power device. However, changing the devices for the pole fault conditions such as the bypass switch failure and the power unit main control board may cause the power unit bypass failure, and the converter valve is stopped. Chinese patent publication No. CN110277935A, "a bypass control method for a modular multilevel converter fault power module", indicates that a converter valve lockout trip method is used to protect the converter valves when the power module bypass fails. Thus, at the power module: under the conditions of abnormal work of the power unit control board card, energy taking power failure, failure of the bypass trigger circuit and failure of the body of the bypass switch, the shutdown of the flexible-direct system can occur. The occurrence of a single power unit fault causes system tripping, reducing the reliability of the soft-straight system.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a reliable bypass device and a bypass method for a flexible direct-current transmission power unit, and particularly relates to a design of a redundant trigger circuit and a multi-stage redundant bypass strategy, so that a fault submodule can provide a long-term reliable through-current path under any extreme working condition.
In order to achieve the purpose, the invention adopts the following technical scheme:
a reliable bypass device of a flexible direct-current power transmission power unit comprises a bypass contactor, an energy-taking power supply, a trigger board, a core control board, a redundant trigger module and a drive module; the input end of the driving module is connected with the core control board through a third group of optical fibers, and the output end of the driving module is connected with the gate pole of the IGBT switching device of the power unit; a main switch K of the bypass contactor is connected with the output end of the power unit in parallel, a driving coil L of the bypass contactor is connected with the output ends of the trigger board and the redundant trigger module in parallel respectively, the input end of the trigger board is connected with the core control board through optical fibers, and an energy-taking power supply is connected with power terminals of the trigger board and the core control board; the bypass contactor comprises a driving coil L and a main switch K, and the main switch is driven to be switched on and mechanically locked after the two ends of the driving coil are electrified; two ends of the driving coil are respectively connected with the positive electrode and negative electrode of the trigger plate, and the main switch K is connected with the output end of the power unit in parallel.
The core control board comprises an FPGA chip, a peripheral circuit of the FPGA chip and an overvoltage protection module, the FPGA chip is connected with four groups of optical fibers, a first group of transceiving optical fibers are connected with the redundancy trigger modules of adjacent power units, and are used for sending bypass commands to the adjacent units and receiving the states of bypass contactors returned by the redundancy trigger modules of the adjacent units; the second group of transceiving optical fibers are connected with the valve control system, send the state information of the power unit to the valve control system and receive a control command sent by the valve control system; the third group of transceiving optical fibers is connected with the driving module, sends a power device trigger pulse signal and receives state information returned by the driving module; the fourth group of optical fibers are connected with the input end of the trigger plate of the bypass contactor and output a trigger signal of the bypass contactor; the input end of the overvoltage protection module is a power unit capacitor CHVoltage, two output terminals are all connected withThe FPGA chip is connected, and the first path V1 is a hardware overvoltage signal and is used for hardware overvoltage protection; the second path V2 is a power unit voltage sampling value and is used for judging overvoltage of FPGA chip software; when the software overvoltage fault fails and the voltage of the power unit is too high, the first overvoltage signal V1 of the overvoltage protection module outputs logic 1, and a bypass command is output through the FPGA.
The redundancy trigger module comprises a redundancy trigger board, a redundancy energy-taking power supply, a voltage comparator Cmp, a logic circuit OR and a signal transceiver; the redundancy energy-taking power supply is connected with a power supply terminal of the redundancy trigger board to supply power to the redundancy trigger board; the input end of the signal transceiver receives the bypass trigger command of the adjacent power unit through a group of optical fibers and sends the bypass state information of the power unit, and the output of the signal transceiver and the output of the voltage comparator Cmp are respectively connected with two input ends of an OR (logic circuit); the input end of the voltage comparator is respectively connected with a voltage signal ref of a reference voltage source and a voltage sampling signal of the power unit; the output end of the logic circuit is connected with the redundancy trigger board and outputs a bypass command; the output voltage signal of the redundant trigger plate is connected with the driving coil of the bypass contactor in parallel.
The energy-taking power supply outputs more than or equal to 2 groups of direct-current voltages with different voltage levels, and the input power supply is a main capacitor C of the power unitH(ii) a The output direct current voltage is respectively connected with the power supply terminals of the trigger board and the core control board.
The input end of the trigger board is a photoelectric conversion device, is connected with the output end of the core control board through an optical fiber and receives a trigger signal of a bypass contactor of the core control board; the trigger plate outputs direct-current voltage, and the anode and the cathode of the output end are respectively connected with two ends of a drive coil of the bypass contactor.
The output end of the driving module is connected with a gate pole of a power unit switching device and outputs a power device trigger signal, and the input end of the driving module is connected with a core control board through an optical fiber and receives a switching signal of the power device; the driving module comprises a clamping circuit, and when the driving board detects that the voltage between the C pole and the E pole of the power device exceeds the threshold value of the clamping circuit, the connected power device is triggered to be conducted.
The output of the voltage comparator in the overvoltage protection module is used as a first output end V1 of the overvoltage protection module and is connected with the FPGA chip; when the power cell voltage sample is higher than the reference power supply, the comparator outputs a high level, thereby issuing a power cell bypass command.
A bypass method of a reliable bypass device of a flexible direct current transmission power unit is a multi-stage bypass strategy, and comprises a first stage: the bypass trigger plate triggers the bypass switch; and a second stage: an adjacent sub-module bypass switch; and a third stage: the voltage comparator triggers the bypass switch and the fourth stage: and the driving module passive active clamping circuit triggers the IGBT to fail.
The first stage is a bypass trigger plate trigger bypass switch strategy and is formed by sequentially connecting an energy-taking power supply failure condition, an FPGA failure condition, a software trigger bypass switch action, a condition whether bypass is successful for the first time or not, an overvoltage protection module trigger bypass switch and a bypass trigger plate trigger bypass switch action of the first stage in series; if the first bypass is successful, a first-stage bypass trigger board is executed to trigger a bypass switch, if the first bypass is unsuccessful, the bypass switch is triggered by the overvoltage protection module, the bypass switch is a second bypass, and if the second bypass is successful, the first-stage bypass trigger board is executed to trigger the bypass switch, so that the bypass switch is used as a long-term through-flow path of the power module, and the bypass of the power unit is completed.
The second level is an adjacent sub-module bypass switch strategy which is formed by sequentially connecting a redundant energy-taking power failure condition, a black module action, a valve control notification adjacent sub-module action, an adjacent sub-module trigger bypass switch action, a third bypass success condition and a second level adjacent sub-module trigger bypass switch action in series; the bypass switch is used as a long-term through-current path of the power module, and the bypass of the power unit is completed.
The third stage is a strategy of triggering the bypass switch by the voltage comparator, and the strategy is formed by sequentially connecting the action of triggering the bypass switch by the voltage comparator, the condition of whether the bypass is successful for the fourth time and the action of triggering the bypass switch by the voltage comparator of the third stage in series, so that the bypass switch is used as a long-term through-flow path of the power module to finish the bypass of the power unit.
The fourth stage is a strategy that the driving module passive active clamping circuit triggers the IGBT failure, and the strategy is formed by sequentially connecting the action of the passive active clamping circuit triggering the IGBT, the action of the IGBT failure and the action of the fourth stage that the driving module passive active clamping circuit triggering the IGBT failure in series; and the bypass of the power unit is completed by using the failure power device as a long-term through-current path.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the device and the multi-stage bypass method for the reliable bypass of the flexible direct-current transmission power unit, the power unit comprises the redundancy trigger module, the low-power redundancy energy-taking power supply is used as the redundancy bypass contactor trigger power supply, power is mainly supplied to the redundancy trigger board of the bypass contactor, the standby trigger power supply after the failure of the large rated power energy-taking power supply of the power unit is realized, and the driving of the bypass contactor under the extreme working condition of the failure of the energy-taking power supply of the power unit can be realized.
2. According to the device and the multi-stage bypass method for the reliable bypass of the flexible direct-current transmission power unit, the power unit redundancy trigger module can receive the bypass command sent by the adjacent power unit and send the state information of the contactor of the power unit through the adjacent power unit, so that the bypass command issued by a valve control still can be received under the fault working condition of a core board of the power unit, the state of the contactor is fed back, and whether the bypass is completed by the fault unit or not is confirmed.
3. According to the device and the multi-stage bypass method for the reliable bypass of the flexible direct-current transmission power unit, the hardware voltage comparator is used for achieving an active self-bypass function under the overvoltage working condition of the power module, and under the working condition that both the energy-taking power supply of the power module and the redundant bypass trigger module are in failure, the hardware voltage comparator can be used for actively sending out the trigger signal of the bypass contactor, so that the bypass of the power unit is completed.
4. According to the device and the multi-stage bypass method for the reliable bypass of the flexible direct-current transmission power unit, the driving module of the switching device comprises the passive active clamping circuit, under the extreme working condition that the bypass contactor has a fault and cannot close the bypass switch, the voltage at two ends of the IGBT is detected, the IGBT can be triggered to be in a failure state by the clamping circuit, and the failure IGBT is used for providing a current path to realize the bypass of the power unit.
5. According to the device and the method for the reliable bypass of the flexible direct-current transmission power unit, the provided multi-stage bypass method sequentially and automatically judges and executes a certain-stage bypass strategy according to the overvoltage degree of the power unit, and the first-stage bypass strategy can complete the power unit bypass under the normal working condition. The power unit bypass protection circuit can protect the safety of a power device and can realize the bypass of the power unit under the extreme working condition.
Drawings
FIG. 1 is a topological structure diagram of a converter valve steady state operation testing device of the present invention;
FIG. 2 is a schematic diagram of an overvoltage protection module of the present invention;
FIG. 3 is a sub-module overall bypass policy flow diagram of the present invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, a device for reliably bypassing a flexible direct-current transmission power unit includes a bypass contactor, an energy-taking power supply, a trigger board, a core control board, a redundant trigger module, and a driving module. The input end of the driving module is connected with the core control board through an optical fiber 3, and the output end of the driving module is connected with the gate pole of the IGBT switching device of the power unit. A main switch K of the bypass contactor is connected with the output end of the power unit in parallel, a driving coil L of the bypass contactor is connected with the output ends of the trigger board and the redundant trigger module in parallel respectively, the input end of the trigger board is connected with the core control board through an optical fiber 4, and the energy-taking power supply is connected with power terminals of the trigger board and the core control board.
The bypass contactor comprises a driving coil L and a main switch K, and the main switch is driven to be switched on and mechanically locked after the two ends of the driving coil are electrified. Two ends of the driving coil are respectively connected with the positive electrode and negative electrode of the trigger plate, and the main switch K is connected with the output end of the power unit in parallel.
The energy-obtaining power supply can output more than or equal to 2 groups of direct-current voltages with different voltage levels, and the input power supply thereofBeing the main capacitor C of the power unit itselfH. The output direct current voltage is respectively connected with the power supply terminals of the trigger board and the core control board.
The input end of the trigger board is a photoelectric conversion device, is connected with the output end of the core control board through an optical fiber and receives a trigger signal of a bypass contactor of the core control board. The trigger plate outputs direct-current voltage, and the anode and the cathode of the output end are respectively connected with two ends of a drive coil of the bypass contactor.
The core control board comprises an FPGA chip, a peripheral circuit of the FPGA chip and an overvoltage protection module, the FPGA chip is connected with four groups of optical fibers, a first group of transceiving optical fibers 1 is connected with the redundancy trigger modules of adjacent power units, and sends bypass commands to the adjacent units and receives the states of bypass contactors returned by the redundancy trigger modules of the adjacent units. The second group of transceiving optical fibers 2 are connected with the valve control system, send the state information of the power unit to the valve control system and receive the control command sent by the valve control system. The third group of transceiving optical fibers 3 is connected with the driving module, sends a power device trigger pulse signal and receives state information returned by the driving module. The fourth optical fiber 4 is connected with the input end of the trigger plate of the bypass contactor and outputs a trigger signal of the bypass contactor. The input end of the overvoltage protection module is a power unit capacitor CHThe voltage output ends of the two paths are connected with the FPGA chip, and the first path V1 is a hardware overvoltage signal and is used for hardware overvoltage protection; and the second path V2 is a power unit voltage sampling value and is used for judging overvoltage of FPGA chip software. When the software overvoltage fault fails and the voltage of the power unit is too high, the first overvoltage signal V1 of the overvoltage protection module outputs logic 1, and a bypass command is output through the FPGA.
As shown in fig. 2, the overvoltage protection module includes a voltage sampling device, an AD conversion chip, a voltage comparator, an input resistor R, and a filter capacitor C. Voltage sampling device and power module capacitor CHAnd connecting, acquiring capacitor voltage, converting the capacitor voltage into a low-voltage signal in an equal proportion (for example, converting 0-5000V voltage into 0-5V low-voltage signal), and respectively connecting the low-voltage signal with the AD conversion chip and the input resistor. The AD conversion chip converts the sampling voltage into a digital quantity which is used as a second output end V2 of the overvoltage protection module and is connected to the FPGA chip. Input resistor and voltage comparator "+" input end and filterOne end of the wave capacitor is connected, the other end of the filter capacitor is grounded, and the input end of the voltage comparator is connected with a reference voltage to provide a reference voltage ref of a hardware overvoltage threshold value, such as 4V (representing the actual voltage 4000V). The output of the voltage comparator is used as a first output end V1 of the overvoltage protection module and is connected with the FPGA chip. When the power cell voltage sample is higher than the reference power supply, the comparator outputs a high level, thereby issuing a power cell bypass command.
The redundancy trigger module comprises a redundancy trigger board, a redundancy energy-taking power supply, a voltage comparator Cmp, a logic circuit OR and a signal transceiver. And the redundant energy-taking power supply is connected with the power supply terminal of the redundant trigger plate to supply power for the redundant trigger plate. The output power of the redundant energy taking power supply is smaller than that of the power module energy taking power supply, and only necessary energy for triggering the bypass contactor by the operation of the redundant trigger board is provided. The input end of the signal transceiver receives the bypass trigger command of the adjacent power unit through a group of optical fibers and sends the bypass state information of the power unit, and the output of the signal transceiver and the output of the voltage comparator Cmp are respectively connected with two input ends of the logic circuit OR. The input end of the voltage comparator is respectively connected with a voltage signal ref of a reference voltage source and a voltage sampling signal of the power unit, and when the voltage sampling value of the power unit is higher than that of the reference power source, the comparator outputs high level. The output end of the logic circuit is connected with the redundancy trigger board and outputs a bypass command. The output voltage signal of the redundant trigger plate is connected with the driving coil of the bypass contactor in parallel.
The output end of the driving module is connected with gate poles of power unit switching devices IGBT1 and IGBT2, a power device trigger signal is output, and the input end of the driving module is connected with the core control board through an optical fiber and receives a switching signal of the power device. The driving module comprises a clamping circuit, and when the driving board detects that the voltage between the C pole and the E pole of the power device IGBT2 exceeds a clamping circuit threshold value, the connected IGBT2 is triggered to be conducted.
As shown in fig. 3, a method for reliable bypass of a flexible dc power transmission unit is a multi-stage bypass strategy, and includes a first stage: the bypass trigger plate triggers the bypass switch; and a second stage: an adjacent sub-module bypass switch; and a third stage: the voltage comparator triggers the bypass switch and the fourth stage: the driving module passive active clamping circuit triggers the IGBT to fail, threshold setting is reasonably carried out on bypass measures of all levels, for example, the rated voltage of a power module is 2100V, a software overvoltage bypass threshold value can be set to be 3200V, a third-level voltage comparator threshold value is 3300V, a fourth-level clamping current threshold value is 4300V, and the voltage threshold value and logic are matched with each other. It is emphasized that the multi-level bypass redundancy measure can also effectively solve the problem of "black module" occurring in the power-on and operation processes, and can acquire the status message of the sub-module through the redundancy trigger module and the adjacent power unit, and can also trigger the bypass in time. The black module is a power unit with a core control panel and a valve control system, wherein the core control panel and the valve control system have uplink and downlink optical fiber communication faults, and the valve control system cannot acquire state information of the power module.
The first stage: the bypass trigger board triggers a bypass switch strategy, and the bypass switch is triggered by an energy-taking power failure condition, an FPGA failure condition, a software triggered bypass switch action, a bypass success condition and an overvoltage protection module, and a first stage: the bypass trigger plate triggers the action of the bypass switch to be connected in series in sequence. Starting logic judgment by taking ' power unit failure ' as a starting point, outputting logic ' N ' (N is logic judgment false) by ' energy taking power failure ', further judging ' FPGA failure ' condition, executing ' software triggering bypass switch ' action by the condition output logic ' N ', judging ' whether bypass is successful ' for the first time later, outputting logic ' Y ' (Y is logic judgment true) by the condition, and executing ' first stage: the bypass trigger plate triggers a bypass switch to act; on the contrary, if the condition outputs logic "N", it is determined again whether the condition "bypass success", and if the condition outputs logic "Y", the "first stage: the bypass trigger board triggers a bypass switch to act, the two path branches can both complete a first-level bypass strategy, and the bypass switch is used as a long-term through-current path of the power module to complete the bypass of the power unit.
The second stage: the adjacent sub-module bypass switch strategy is characterized in that the adjacent sub-module bypass switch strategy comprises a redundant energy-taking power failure condition, a black module generation action, a valve control notification adjacent sub-module action, an adjacent sub-module trigger bypass switch action, a bypass success condition and a second stage: the actions of the adjacent sub-modules triggering the bypass switches are connected in series in sequence. And starting logic judgment by taking the 'energy taking power failure' condition output logic 'Y' as a 1 st entry condition or taking the 'FPGA failure' condition output logic 'Y' as a 2 nd entry condition as a starting point, wherein the 1 st entry condition is connected with the 'redundant energy taking power failure' condition, and the 2 nd entry condition is connected with the 'black generation module' action. After entering a second-stage bypass strategy, firstly outputting logic ' N ' under the condition of redundant power supply failure, executing the action of ' generating a black module ', then executing the action of ' triggering a bypass switch by an adjacent unit ', then judging the condition of ' whether bypass is successful or not 2 ', and executing ' the second stage if the condition is output to ' Y ': and the adjacent sub-modules trigger a bypass switch to act, so that the bypass switch is used as a long-term through-current path of the power module, and the bypass of the power unit is completed.
The third stage: the voltage comparator triggers a bypass switch strategy, and the action of the voltage comparator triggering the bypass switch, the condition of whether the bypass is successful or not and the third stage are as follows: the action of the voltage comparator triggering bypass switch is sequentially connected in series to form a bypass switch, the condition of whether the bypass is successful 2 or not is taken as an entering condition, the bypass switch triggering condition is connected with the action of the voltage comparator triggering bypass switch, then the condition of whether the bypass is successful 4 is judged, the condition outputs logic Y, and then the third stage is executed: the voltage comparator triggers the action of the bypass switch, so that the bypass switch is used as a long-term through-current path of the power module, and the bypass of the power unit is completed.
The fourth stage: the driving module passive active clamping circuit triggers an IGBT failure strategy, and the passive active clamping circuit triggers the IGBT action, the IGBT failure action and the fourth stage: the driving module is formed by connecting the passive active clamping circuit triggering IGBT failure action in series in sequence. In the third level bypass strategy: the 'redundant power supply failure' condition output logic 'Y' is the 1 st entry condition, and the 'whether bypass is successful 4' output logic 'N' is the 2 nd entry condition, the 1 st and 2 nd entry conditions are connected with the 'passive active clamping circuit triggering IGBT' action, then the 'IGBT failure action' is executed, and finally the 'fourth stage' is executed: the passive active clamping circuit of the driving module triggers the IGBT failure action, so that the failure power device is used as a long-term through-current path to complete the bypass of the power unit.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (7)
1. A reliable bypass device of a flexible direct-current power transmission power unit comprises a bypass contactor, an energy-taking power supply, a trigger board, a core control board, a redundant trigger module and a drive module; the input end of the driving module is connected with the core control board through a third group of transceiving optical fibers, and the output end of the driving module is connected with the gate pole of the IGBT switching device of the power unit; a main switch K of the bypass contactor is connected with the output end of the power unit in parallel, a driving coil L of the bypass contactor is connected with the output ends of the trigger board and the redundant trigger module in parallel respectively, the input end of the trigger board is connected with the core control board through a fourth group of transceiving optical fibers, and an energy-taking power supply is connected with power terminals of the trigger board and the core control board; the bypass contactor comprises a driving coil L and a main switch K of the bypass contactor, and the main switch is driven to be switched on and mechanically locked after the two ends of the driving coil are electrified; two ends of the driving coil are respectively connected with the positive electrode output end and the negative electrode output end of the trigger plate, and the main switch K of the bypass contactor is connected with the output end of the power unit in parallel;
the core control board is characterized by comprising an FPGA chip, a peripheral circuit of the FPGA chip and an overvoltage protection module, wherein the FPGA chip is connected with four groups of optical fibers, a first group of transceiving optical fibers are connected with a redundancy trigger module of an adjacent power unit, send a bypass command to the adjacent power unit and receive a bypass contactor state returned by the redundancy trigger module of the adjacent power unit; the second group of transceiving optical fibers are connected with the valve control system, send the state information of the power unit to the valve control system and receive a control command sent by the valve control system; the third group of receiving and transmitting optical fibers are connected with the driving module, send the trigger pulse signal of the IGBT switching device and receive the driving moduleReturned status information; the fourth group of transceiving optical fibers are connected with the input end of the trigger plate and output the trigger signal of the bypass contactor; the input end of the overvoltage protection module is a power unit capacitor CHThe voltage output ends of the two paths are connected with the FPGA chip, and the first path of overvoltage signal V1 is a hardware overvoltage signal and is used for hardware overvoltage protection; the second path of overvoltage signal V2 is a power unit voltage sampling signal and is used for judging overvoltage of FPGA chip software; when the software overvoltage fault fails and the voltage of the power unit is too high, the first overvoltage signal V1 of the overvoltage protection module outputs logic 1, and a bypass command is output through the FPGA.
2. The reliable bypass device of the flexible direct current transmission power unit according to claim 1, characterized in that the redundancy trigger module comprises a redundancy trigger board, a redundancy energy-taking power supply, a voltage comparator Cmp, a logic circuit OR and a signal transceiver device; the redundancy energy-taking power supply is connected with a power supply terminal of the redundancy trigger board to supply power to the redundancy trigger board; the input end of the signal transceiver receives the bypass command of the adjacent power unit through the first group of transceiver fibers and sends the state information of the bypass contactor of the power unit, and the output of the signal transceiver and the output of the voltage comparator Cmp are respectively connected with two input ends of an OR logic circuit; the input end of the voltage comparator Cmp is respectively connected with a voltage signal ref of a reference voltage source and a voltage sampling signal of the power unit; the output end of the logic circuit is connected with the redundancy trigger board and outputs a bypass command; the output voltage signal of the redundant trigger plate is connected with the driving coil of the bypass contactor in parallel.
3. The reliable bypass device for flexible direct current transmission power unit according to claim 1, wherein the energy-obtaining power source outputs direct current voltages with 2 groups of different voltage levels or more, and the input power source is the power unit capacitor C of the power unitH(ii) a The output direct current voltage is respectively connected with the power supply terminals of the trigger board and the core control board.
4. The reliable bypass device of the flexible direct current transmission power unit according to claim 1, wherein the input end of the trigger board is a photoelectric conversion device, and is connected with the output end of the core control board through a fourth set of transceiving optical fibers to receive the trigger signal of the bypass contactor of the core control board; the trigger plate outputs direct-current voltage, and the anode and the cathode of the output end are respectively connected with two ends of a drive coil of the bypass contactor.
5. The reliable bypass device of a flexible direct current transmission power unit according to claim 1, wherein the output of the driving module is connected with the gate of the power unit switching device to output the trigger pulse signal of the IGBT switching device, and the input end of the driving module is connected with the core control board through a third set of transceiving optical fibers to receive the switching signal of the IGBT switching device; the driving module comprises a clamping circuit, and when the driving module detects that the voltage between the C pole and the E pole of the IGBT switching device exceeds the threshold value of the clamping circuit, the driving module triggers the connected IGBT switching device to be conducted.
6. The reliable bypass device of the flexible direct current power transmission power unit according to claim 1, wherein a voltage comparator in the overvoltage protection module outputs a first overvoltage signal V1 as a first output end of the overvoltage protection module, and is connected to the FPGA chip; when the power unit voltage sampling signal is higher than the reference voltage source voltage signal ref, the voltage comparator in the overvoltage protection module outputs a high level, so that a power unit bypass command is sent out.
7. The method for bypassing a reliable bypass device of a flexible direct current transmission power unit according to claim 1, which is a multi-stage bypass strategy, comprising a first stage: the trigger plate triggers the bypass contactor; and a second stage: the adjacent power units trigger the bypass contactor; and a third stage: the voltage comparator triggers the bypass contactor and the fourth stage: a clamping circuit of the driving module triggers an IGBT switching device to fail;
the first stage is a strategy of triggering the bypass contactor by the trigger board, and the strategy is formed by sequentially connecting an energy taking power supply failure condition, an FPGA failure condition, a software triggered bypass contactor action, a condition whether the bypass is successful for the first time, a trigger bypass contactor triggered by the overvoltage protection module and a trigger board triggered bypass contactor action of the first stage in series; if the first bypass is successful, executing a first-stage trigger board to trigger a bypass contactor, if the first bypass is unsuccessful, triggering the bypass contactor by an overvoltage protection module, wherein the bypass contactor is a second bypass, and if the second bypass is successful, executing the first-stage trigger board to trigger the bypass contactor, so that the bypass contactor is used as a long-term through-flow path of the power unit, and the bypass of the power unit is completed;
the second stage is a strategy of triggering the bypass contactor by the adjacent power unit, and is formed by sequentially connecting a redundant energy taking power failure condition, a black module action, a valve control system for informing an adjacent sub-module action, an adjacent power unit for triggering the bypass contactor action, a condition of whether bypass is successful for the third time and a condition of triggering the bypass contactor action by the adjacent power unit of the second stage in series; the bypass contactor is used as a long-term through-current path of the power unit to complete the bypass of the power unit;
the third stage is a strategy of triggering the bypass contactor by the voltage comparator, and the strategy is formed by sequentially connecting the action of triggering the bypass contactor by the voltage comparator in the overvoltage protection module, the condition of whether the bypass is successful for the fourth time and the action of triggering the bypass contactor by the voltage comparator of the third stage in series, so that the bypass contactor is used as a long-term through-flow path of the power unit to complete the bypass of the power unit;
the fourth stage is a strategy that the clamping circuit of the driving module triggers the failure of the IGBT switching device, and the strategy is formed by sequentially connecting the actions of the clamping circuit triggering the IGBT switching device, the failure of the IGBT switching device and the failure of the IGBT switching device triggered by the clamping circuit of the driving module of the fourth stage in series; the bypass of the power unit is completed by using the failed IGBT switching device as a long-term through-current path.
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| CN111711218A (en) * | 2020-05-29 | 2020-09-25 | 中国南方电网有限责任公司超高压输电公司 | Converter chain with redundant bypass capability and control method thereof |
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