CN109167507B - Multi-level converter submodule redundant energy supply circuit and control method - Google Patents

Multi-level converter submodule redundant energy supply circuit and control method Download PDF

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Publication number
CN109167507B
CN109167507B CN201811153654.2A CN201811153654A CN109167507B CN 109167507 B CN109167507 B CN 109167507B CN 201811153654 A CN201811153654 A CN 201811153654A CN 109167507 B CN109167507 B CN 109167507B
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board card
voltage
resistor
bypass switch
module
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CN109167507A (en
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虞晓阳
汪涛
李乐乐
骆仁松
文继锋
曹东明
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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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
    • H02M1/16—Means for providing current step on switching, e.g. with saturable reactor
    • 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
    • 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

Abstract

The inventionDisclosed are a multi-level converter submodule redundant energy supply circuit and a control method. The multilevel converter submodule comprises at least one power semiconductor unit and a submodule capacitor CMBypass switch KBThe power supply board card and the control board card. The redundant energy supply circuit is composed of a first resistor R1, a second resistor R2, a connecting module and a voltage conversion circuit. According to the scheme of the invention, after the power board card fails, the voltage-sharing resistor voltage-dividing and voltage-converting circuit is utilized to realize the charging of the energy-storing capacitor of the bypass switch and the power supply of the control board card, so that the reliable switching-on and sub-module state uploading of the bypass switch are ensured after the power board card fails, the system shutdown and the fault operation under the unknown state of the bypass switch are avoided, and the safety and the reliability of the system are improved. The scheme of the invention utilizes the energy of the submodule voltage-sharing resistor loop, does not additionally increase the loss of the system, improves the economical efficiency of the system operation, has simple and reliable structure, has implementability and low cost.

Description

Multi-level converter submodule redundant energy supply circuit and control method
Technical Field
The invention discloses a multi-level converter submodule redundant energy supply circuit and a control method, relates to the field of flexible alternating current and direct current transmission, and particularly relates to an energy taking technology of a power unit module.
Background
The cascade multilevel converter is widely applied to occasions of electric power, rail transit and new energy such as extra-high voltage alternating current and direct current transmission, reactive compensation, direct current distribution networks and the like. In order to ensure safe and stable operation of the cascaded multi-level converter, the multi-level converter sub-modules all require a fault bypass function, and when a fault occurs inside the sub-modules, the fault module is bypassed by the bypass function, so that the fault is prevented from being enlarged, the system is maintained to continue to operate, and economic loss is avoided.
However, the power board card is used as an energy source for realizing all control protection functions in the multi-level converter submodule, and a certain fault probability exists due to the service life limitation, aging, failure and other external reasons of devices. Especially, before the system is started, the power board card has a fault working condition, the bypass switch does not have energy required by switching on, the sub-module control board cannot normally send an instruction, and then the bypass function cannot be realized, so that the whole system can be stopped. The invention patent CN201710228027.X provides a multi-level converter submodule bypass switch self-triggering circuit, energy on the alternating current side of a power module unit is used for charging a bypass switch energy storage capacitor, however, if a power panel fails before a system is started, the bypass switch energy storage capacitor is short-circuited due to the fact that the resistance of a bypass switch closing coil is small, and charging cannot be completed, so that the bypass switch cannot complete closing. The invention patent CN108111007A discloses a power module redundant energy supply circuit and a control method, after a power board card fails, a first voltage regulator tube is broken down after the voltage of a first capacitor exceeds a certain threshold to charge an energy storage capacitor of a bypass switch, a second voltage regulator tube is broken down after the voltage of the first capacitor exceeds another threshold to trigger a second switch to be switched on, and then the bypass switch is triggered to be switched on. However, the invention introduces a plurality of high-voltage-stabilizing tubes, which can cause serious heating and poor reliability; the capacity of the bypass switch energy storage capacitor is over several hundred microfarad orders of magnitude, and the bypass switch energy storage capacitor can be charged only after the first capacitor voltage breaks through the first voltage regulator tube, so that the charging time before breakdown is wasted; the introduction of the voltage-stabilizing tube limits the current of the charging loop and influences the charging speed; the voltage stabilizing discreteness of the voltage stabilizing tube is large, the temperature drift is large, and the protection precision is greatly influenced; in addition, a plurality of high-voltage switches are introduced, isolation control is needed, the control is complex, and the engineering feasibility of implementation is poor; more importantly, the invention only makes efforts for realizing the reliable bypass of the bypass switch, but if the bypass switch body fails or is worse, the superior control system cannot know the state of the fault module, and if the bypass switch body continues to operate under the condition of bypass failure, the fault is further expanded, and more serious loss is caused.
Based on the above analysis, the inventor provides a redundant energy supply circuit and a control method for a multi-level converter submodule, so that redundant energy supply of a bypass switch and a submodule control board card is realized, and the redundant energy supply circuit and the control method are produced.
Disclosure of Invention
Object of the Invention
The technical problem to be solved by the invention is as follows: the multi-level converter submodule cannot execute bypass after a power supply board card fails to operate, so that a system is stopped, and can operate with failure under the condition that the bypass state is unknown. When the power board card of the submodule fails, the invention provides energy required by closing for the bypass switch through the redundant energy supply circuit, supplies power for the control board card of the submodule to ensure that the bypass switch is reliably closed, avoids the shutdown of the system, and sends the state of the failure module to the upper part, thereby avoiding the operation of the system with failure and improving the safety and reliability of the operation of the system.
Technical scheme
A multi-level converter submodule redundant energy supply circuit at least comprises a power semiconductor unit and a submodule capacitor CMBypass switch KBEnergy storage capacitor C of bypass switchBControllable switch QBThe control coil, the power board card and the control board card; the multi-level converter submodule redundant energy supply circuit is composed of a first resistor R1, a second resistor R2, a connecting module and a voltage conversion circuit; the connecting module is a diode, a mechanical switch, a relay, an electronic switch or a semiconductor controllable device; the voltage conversion circuit is a circuit for converting input voltage into other voltage and outputting the voltage; the first electricityResistor R1 one end and sub-module capacitor CMThe anode is connected, the other end of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the sub-module capacitor CMThe negative electrodes are connected; one end of the connecting module is connected to the connection point of the first resistor R1 and the second resistor R2, and the other end of the connecting module is connected to the bypass switch energy storage capacitor CBEnergy storage capacitor C of anode and bypass switchBNegative pole is connected to the sub-module capacitor CMA negative electrode; the positive input end of the voltage conversion circuit is connected to the connection point of the first resistor R1 and the second resistor R2, and the negative input end of the voltage conversion circuit is connected to the sub-module capacitor CMThe output of the voltage conversion circuit is connected to the control board card; the power supply integrated circuit board supplies power to the control integrated circuit board, and the output positive end of the power supply integrated circuit board is connected with the bypass switch energy storage capacitor CBThe positive pole and the negative output terminal of the bypass switch are connected with the bypass switch energy storage capacitor CBThe negative electrode of (1); one end of the control coil is connected to the bypass switch energy storage capacitor CBAnd the other end of the positive electrode is connected to the controllable switch QBSaid controllable switch QBIs connected to the bypass switch energy storage capacitor CBThe negative electrode of (1).
Furthermore, the control board card of the multi-level converter submodule comprises a communication unit, a bypass triggering unit and a detection protection unit. The communication unit is responsible for receiving the instruction of the superior control system and sending the state information of the sub-modules; the bypass trigger unit is responsible for executing a bypass trigger command; the detection protection unit is responsible for detecting the state of the submodule, monitoring point voltage and current sampling and the active protection function of the submodule body.
Further, sub-module capacitor C of multi-level converter sub-moduleMBoth ends can all connect voltage-sharing resistance in parallel, reach the voltage-sharing effect of precharge in-process module. Therefore, the first resistor R1 and the second resistor R2 can also serve as voltage-sharing resistors of the submodules while voltage-dividing power supply is performed, and the loss of the system is not additionally increased. The first resistor R1 and the second resistor R2 can be single resistors or can be in a resistor series-parallel structure, so that the redundancy of the loop is improved.
Further, the voltage conversion circuit of the multi-level converter submodule redundant power supply circuit can be a switching power supply module, a linear power supply or a voltage stabilizing circuit.
Further, the power semiconductor unit comprises a half-bridge connection mode at least comprising two power semiconductor devices and a full-bridge connection mode at least comprising four power semiconductor devices.
The invention also discloses a control method of the multi-level converter submodule redundant power supply circuit, which comprises the following steps:
(1) when the power board card fails before the multilevel converter submodule is started, the bypass function is implemented according to the following steps:
step 1: the sub-modules of the multilevel converter begin to be precharged, and the sub-module capacitor CMThe voltage begins to rise; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging; the input undervoltage of the voltage conversion circuit is not started;
step 2: submodule capacitor CMWhen the voltage rises above the starting voltage of the voltage conversion circuit, the voltage conversion circuit works normally, and the board card is controlled to work normally; bypass switch energy storage capacitor CBContinuing to charge;
and step 3: the control board card detection protection unit detects that the sub-module has a fault, and sends fault state information to the upper control system, and the upper control system sends a bypass command after receiving the fault state information;
and 4, step 4: bypass switch energy storage capacitor C detected by control board card detection protection unitBAfter the voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, wherein the control board card communication unit sends a bypass switch position signal to a superior control system; the system continues to operate.
(2) When the multi-level converter sub-module fails in the operation process, the bypass function is implemented according to the following steps:
step 1: the sub-modules of the multilevel converter begin to be precharged, and the sub-module capacitor CMThe voltage begins to rise, and the input undervoltage of the power board card is not started; redundancy supplyThe first resistor R1 and the second resistor R2 of the energy circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging; the input undervoltage of the voltage conversion circuit is not started;
step 2: submodule capacitor CMThe voltage rises above the starting voltage of the power supply board card, the power supply board card works normally, and the energy storage capacitor C is supplied to the bypass switchBCharging, namely supplying power to the control board card; energy storage capacitor C for secondary supply bypass switch of redundant energy supply circuitBThe charging state is automatically exited; the input undervoltage of the voltage conversion circuit is not started;
and step 3:
the following conditions are: the control board card detection protection unit detects that the sub-module is in fault and the power board card is normal;
case two: when the power supply board card fails, the power loss of the board card is controlled, and the sub-module capacitor CMWhen the voltage rises above the starting voltage of the voltage conversion circuit, the voltage conversion circuit works normally, and the board card is controlled to work again; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are divided and then automatically put into the bypass switch energy storage capacitor C through the connecting moduleBContinuing to charge;
and 4, step 4: the control board card sends fault state information to a superior control system; the superior control system receives the fault state information and then issues a bypass command, and the control board card detection protection unit detects the bypass switch energy storage capacitor CBThe voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, namely, transmitting a position signal of the bypass switch on the control board card; the system continues to operate.
Advantageous effects
By adopting the multi-level converter submodule redundant energy supply circuit, the problems of energy taking of the bypass switch energy storage capacitor and power supply of the submodule control board card after the submodule power board card is in fault are solved, and compared with the prior art, the multi-level converter submodule redundant energy supply circuit has the following beneficial effects:
(1) the redundant energy supply of the energy storage capacitor of the bypass switch is realized by using a simple passive voltage division circuit; the energy source of the closing action of the bypass switch is ensured;
(2) a voltage conversion circuit is introduced into a resistor voltage division and reduction port by using a simple passive voltage division circuit, so that the problem of redundant power supply control of the sub-module is solved; the protection triggering function and the state uploading function are guaranteed; the fault expansion caused by the failure or worse working condition of the bypass switch body is avoided;
(3) the protection precision is high by utilizing the digital sampling of the control panel and the high-precision reference chip;
(4) the original voltage-sharing resistance loop energy of the submodule is utilized, and no additional system loss is increased; the method has the advantages of economy;
(5) the circuit structure is simple and reliable, additional control is not needed, the engineering feasibility is high, and the cost is low.
Drawings
Fig. 1 is a schematic diagram of a redundant power supply circuit of a sub-module of a multilevel converter.
Fig. 2 is a schematic diagram of an embodiment of a multi-level converter sub-module redundant power supply circuit of the invention.
FIG. 3 is a logic diagram of a control method of the redundant energy supply circuit of the sub-module of the multilevel converter.
Detailed Description
The following describes the embodiments in further detail with reference to the accompanying drawings.
Redundant energy-taking embodiment:
referring to fig. 1, the redundant energy supply circuit of the multi-level converter submodule protected by the invention at least comprises a power semiconductor unit and a submodule capacitor CMBypass switch KBEnergy storage capacitor C of bypass switchBControllable switch QBThe control coil, the power board card and the control board card; the multi-level converter submodule redundant energy supply circuit is composed of a first resistor R1, a second resistor R2, a connecting module and a voltage conversion circuit; the connecting module is a diode, a mechanical switch, a relay, an electronic switch or a semiconductor controllable device; the voltage conversion circuit is a circuit for converting input voltage into other voltage and outputting the voltage; one end of the first resistor R1 and the sub-module capacitor CMThe other end of the first resistor R1 is connected with the anode of the second resistor R2IOne end of the second resistor R2 is connected with the submodule capacitor CMThe negative electrodes are connected; one end of the connecting module is connected to the connection point of the first resistor R1 and the second resistor R2, and the other end of the connecting module is connected to the bypass switch energy storage capacitor CBEnergy storage capacitor C of anode and bypass switchBNegative pole is connected to the sub-module capacitor CMA negative electrode; the positive input end of the voltage conversion circuit is connected to the connection point of the first resistor R1 and the second resistor R2, and the negative input end of the voltage conversion circuit is connected to the sub-module capacitor CMThe output of the voltage conversion circuit is connected to the control board card; the power supply integrated circuit board supplies power to the control integrated circuit board, and the output positive end of the power supply integrated circuit board is connected with the bypass switch energy storage capacitor CBThe positive pole and the negative output terminal of the bypass switch are connected with the bypass switch energy storage capacitor CBThe negative electrode of (1); one end of the control coil is connected to the bypass switch energy storage capacitor CBAnd the other end of the positive electrode is connected to the controllable switch QBSaid controllable switch QBIs connected to the bypass switch energy storage capacitor CBThe negative electrode of (1).
Preferably, as shown in fig. 2, the connection module of the redundant energy supply circuit of the sub-module of the multilevel converter should adopt a diode or a series-parallel combination of diodes, the anode of the diode is connected to the connection point of the first resistor R1 and the second resistor R2, and the cathode of the diode is connected to the bypass switch energy storage capacitor CBAnd (4) a positive electrode. When the power supply board card works normally, the sub-module capacitor CMWhen the voltage does not reach an overvoltage point, the output of the bypass power supply is higher than the voltage division values of the first resistor R1 and the second resistor R2, and the diode D1 is in a reverse blocking state, so that the influence of a redundant energy supply circuit on a power supply board card can be avoided; capacitor C of current sub-moduleMWhen the voltage exceeds an overvoltage point, the redundant energy supply circuit can supply power, and a diode in the power supply board card can block the influence of the redundant energy supply circuit on the power supply board card; when the power supply board card breaks down, the diode inside the power supply board card is in a reverse blocking state, and the influence on a redundant energy supply circuit is avoided.
Preferably, as shown in fig. 2, the voltage conversion circuit of the redundant energy supply circuit of the multi-level converter submodule should use a DC/DC power module. The DC/DC power module has the advantages of wide input range, stable output voltage and high conversion efficiency, and reduces the influence on the charging speed of the bypass switch energy storage capacitor. The output of the DC/DC power supply module can be provided with a series diode to block the mutual influence between the output of the DC/DC power supply module and the output of the power supply board card.
The embodiment of the control method comprises the following steps:
referring to fig. 3, the invention discloses a control method of a multi-level converter submodule redundant energy supply circuit,
(1) when the power board card fails before the multilevel converter submodule is started, the bypass function is implemented according to the following steps:
step 1: the sub-modules of the multilevel converter begin to be precharged, and the sub-module capacitor CMThe voltage begins to rise; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging; the input undervoltage of the voltage conversion circuit is not started;
step 2: submodule capacitor CMWhen the voltage rises above the starting voltage of the voltage conversion circuit, the voltage conversion circuit works normally, and the board card is controlled to work normally; bypass switch energy storage capacitor CBContinuing to charge;
and step 3: the control board card detection protection unit detects that the sub-module has a fault, and sends fault state information to the upper control system, and the upper control system sends a bypass command after receiving the fault state information;
and 4, step 4: bypass switch energy storage capacitor C detected by control board card detection protection unitBAfter the voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, wherein the control board card communication unit sends a bypass switch position signal to a superior control system; the system continues to operate.
(2) When the multi-level converter sub-module fails in the operation process, the bypass function is implemented according to the following steps:
step 1: the sub-modules of the multilevel converter begin to be precharged, and the sub-module capacitor CMThe voltage begins to rise, and the input undervoltage of the power board card is not started; a first resistor R1 of the redundant power supply circuit,The second resistor R2 is automatically switched in after voltage division through the connecting module to supply the bypass switch energy storage capacitor CBCharging; the input undervoltage of the voltage conversion circuit is not started;
step 2: submodule capacitor CMThe voltage rises above the starting voltage of the power supply board card, the power supply board card works normally, and the energy storage capacitor C is supplied to the bypass switchBCharging, namely supplying power to the control board card; energy storage capacitor C for secondary supply bypass switch of redundant energy supply circuitBThe charging state is automatically exited; the input undervoltage of the voltage conversion circuit is not started;
and step 3:
the following conditions are: the control board card detection protection unit detects that the sub-module is in fault and the power board card is normal;
case two: when the power supply board card fails, the power loss of the board card is controlled, and the sub-module capacitor CMWhen the voltage rises above the starting voltage of the voltage conversion circuit, the voltage conversion circuit works normally, and the board card is controlled to work again; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are divided and then automatically put into the bypass switch energy storage capacitor C through the connecting moduleBContinuing to charge;
and 4, step 4: the control board card sends fault state information to a superior control system; the superior control system receives the fault state information and then issues a bypass command, and the control board card detection protection unit detects the bypass switch energy storage capacitor CBThe voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, namely, transmitting a position signal of the bypass switch on the control board card; the system continues to operate.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and various modifications or changes made with reference to the above embodiments are within the scope of the present invention.

Claims (7)

1. A multi-level converter submodule redundant energy supply circuit comprises a power semiconductor unit and a submodule capacitor CMBypass switch KBEnergy storage capacitor C of bypass switchBControllable switch QBControl coil, power supply board card and controlThe integrated circuit board, its characterized in that: the multi-level converter submodule redundant energy supply circuit is composed of a first resistor R1, a second resistor R2, a connecting module and a voltage conversion circuit; the connecting module is a diode, a mechanical switch, a relay, an electronic switch or a semiconductor controllable device;
the voltage conversion circuit is a circuit for converting input voltage into other voltage and outputting the voltage; one end of the first resistor R1 and the sub-module capacitor CMThe anode is connected, the other end of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the sub-module capacitor CMThe negative electrodes are connected;
one end of the connecting module is connected to the connection point of the first resistor R1 and the second resistor R2, and the other end of the connecting module is connected to the bypass switch energy storage capacitor CBEnergy storage capacitor C of anode and bypass switchBNegative pole is connected to the sub-module capacitor CMA negative electrode;
the positive input end of the voltage conversion circuit is connected to the connection point of the first resistor R1 and the second resistor R2, and the negative input end of the voltage conversion circuit is connected to the sub-module capacitor CMThe output of the voltage conversion circuit is connected to the control board card;
the power supply integrated circuit board supplies power to the control integrated circuit board, and the output positive end of the power supply integrated circuit board is connected with the bypass switch energy storage capacitor CBThe positive pole and the negative output terminal of the bypass switch are connected with the bypass switch energy storage capacitor CBThe negative electrode of (1); one end of the control coil is connected to the bypass switch energy storage capacitor CBAnd the other end of the positive electrode is connected to the controllable switch QBSaid controllable switch QBIs connected to the bypass switch energy storage capacitor CBThe negative electrode of (1).
2. The multi-level converter sub-module redundant power supply circuit of claim 1, wherein: the control board card comprises a communication unit, a bypass trigger unit and a detection protection unit.
3. The multi-level converter sub-module redundant power supply circuit of claim 1, wherein: the first resistor R1 and the second resistor R2 are respectively a single resistor or a plurality of resistors in series and parallel connection.
4. The multi-level converter sub-module redundant power supply circuit of claim 1, wherein: the voltage conversion circuit is a switch power supply module, a linear power supply or a voltage stabilizing circuit.
5. The multi-level converter sub-module redundant power supply circuit of claim 1, wherein: the power semiconductor unit comprises a half-bridge connection mode at least comprising two power semiconductor devices and a full-bridge connection mode at least comprising four power semiconductor devices.
6. The method for controlling a redundant power supply circuit of a submodule of a multilevel converter according to any of claims 1 to 5, wherein: when the power board card fails before the multi-level converter submodule is started, the implementation of the bypass function comprises the following steps;
step 1: the sub-modules of the multilevel converter begin to be precharged, and the sub-module capacitor CMThe voltage begins to rise, and the power board card fails to work; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging; the input undervoltage of the voltage conversion circuit is not started;
step 2: submodule capacitor CMWhen the voltage rises above the starting voltage of the voltage conversion circuit, the voltage conversion circuit works normally, and the board card is controlled to work normally; bypass switch energy storage capacitor CBContinuing to charge;
and step 3: the control board card detection protection unit detects that the sub-module has a fault, and sends fault state information to the upper control system, and the upper control system sends a bypass command after receiving the fault state information;
and 4, step 4: bypass switch energy storage capacitor C detected by control board card detection protection unitBAfter the voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBClosing, controlling the communication unit of the board card toThe superior control system sends a position signal of the bypass switch; the system continues to operate.
7. The method for controlling a redundant power supply circuit of a submodule of a multilevel converter according to any of claims 1 to 5, wherein: when the sub-module of the multilevel converter fails in the operation process, the implementation of the bypass function comprises the following steps;
step 1: the sub-modules of the multilevel converter begin to be precharged, and the sub-module capacitor CMThe voltage begins to rise, and the input undervoltage of the power board card is not started; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging; the input undervoltage of the voltage conversion circuit is not started;
step 2: submodule capacitor CMThe voltage rises above the starting voltage of the power supply board card, the power supply board card works normally, and the energy storage capacitor C is supplied to the bypass switchBCharging, namely supplying power to the control board card; energy storage capacitor C for secondary supply bypass switch of redundant energy supply circuitBThe charging state is automatically exited; the input undervoltage of the voltage conversion circuit is not started;
and step 3:
the following conditions are: the control board card detection protection unit detects that the sub-module is in fault and the power board card is normal;
case two: when the power supply board card fails, the power loss of the board card is controlled, and the sub-module capacitor CMWhen the voltage rises above the starting voltage of the voltage conversion circuit, the voltage conversion circuit works normally, and the board card is controlled to work again; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are divided and then automatically put into the bypass switch energy storage capacitor C through the connecting moduleBContinuing to charge;
and 4, step 4: the control board card sends fault state information to a superior control system; the superior control system receives the fault state information and then issues a bypass command, and the control board card detection protection unit detects the bypass switch energy storage capacitor CBThe voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, namely, transmitting a position signal of the bypass switch on the control board card; the system continues to operate。
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