Bypass switch operation refusing method, converter valve and central control board

Abstract

The invention discloses a bypass switch operation refusing method, a converter valve and an electric control board, and relates to the field of faults, a central control board of any sub-module in the converter valve periodically sends a preset signal to a central control board of an adjacent sub-module, and judges whether the preset signal sent by the central control board of the adjacent sub-module is not received in more than one period; if the preset signal sent by the central control board of the adjacent sub-module is not received in more than one period, it is judged that the adjacent sub-module has a bypass switch trigger fault, and at the moment, the central control board sends an adjacent trigger signal to the bypass switch of the adjacent sub-module so as to control the bypass switch of the adjacent sub-module to be closed; the adjacent sub-modules with faults are bypassed in time, the safety of the converter valve is improved, and the safety of a flexible direct-current power transmission system where the converter valve is located is further guaranteed.

Description

Technical Field

[0001] The invention relates to the field of faults, and in particular to a bypass switch refusal method, a converter valve and an electric control board. Background Art

[0002] As the core equipment of flexible direct current transmission, the converter valve of flexible direct current transmission project undertakes core functions such as rectification and inversion, and plays an irreplaceable role in new energy grid connection and island power supply. However, because the converter valve contains several submodules, and the output ends of each submodule are connected in series, each submodule includes a bypass switch, a central control board, a main power supply, a module capacitor, and a converter module. Among them, the bypass switch is connected in parallel with the output end of the submodule. With the operation of the converter valve, the central control board in the submodule may fail. At this time, the central control board cannot control the bypass switch to close, and thus cannot bypass the faulty submodule, resulting in the locking of the flexible direct current transmission system where the converter valve is located, which greatly affects the transmission efficiency of electric energy. Summary of the invention

[0003] The object of the present invention is to provide a bypass switch refusal method, a converter valve and an electric control board, wherein a communication network is constructed between a submodule and an adjacent submodule to monitor the fault condition of an adjacent submodule. When a fault is detected in an adjacent submodule, an adjacent trigger signal is actively sent to control the bypass switch of the adjacent submodule to close, and the adjacent submodule with the fault is bypassed in time, thereby improving the safety of the converter valve and further ensuring the safety of the flexible direct current transmission system in which the converter valve is located.

[0004] In order to solve the above technical problems, the present invention provides a bypass switch refusal method, which is applied to a central control board of any submodule of a converter valve, and comprises:

[0005] Periodically sending a preset signal to a central control board of a submodule adjacent to the submodule in the converter valve, and determining whether the preset signal sent by the central control board of the adjacent submodule is not received for more than one period;

[0006] If the preset signal sent by the central control board of the adjacent submodule is not received for more than one period, it is determined that a bypass switch triggering failure occurs in the adjacent submodule, and an adjacent triggering signal is sent to the bypass switch of the adjacent submodule to control the bypass switch of the adjacent submodule to close;

[0007] If the preset signal sent by the central control board of the adjacent submodule is not received for more than one period, it is determined that no bypass switch triggering failure occurs in the adjacent submodule.

[0008] Optionally, before determining that a bypass switch triggering failure occurs in the adjacent submodule, the method further includes:

[0009] Determine whether a preset signal sent by the central control board of the adjacent submodule is not received for a first preset time after the one cycle;

[0010] If the preset signal sent by the central control board of the adjacent submodule is not received for a first preset time after the one cycle, triggering the step of determining that a bypass switch triggering failure occurs in the adjacent submodule;

[0011] If the preset signal sent by the central control board of the adjacent submodule is not received for a first preset time after the one cycle, the step of determining whether the bypass switch triggering failure of the adjacent submodule occurs is triggered.

[0012] Optionally, if the neighboring state signal is not received for a first preset time after the one cycle, the method further includes:

[0013] Determine whether the capacitor voltage of the module capacitor of the adjacent submodule increases by a preset voltage threshold within a second preset time;

[0014] If the capacitor voltage of the module capacitor of the adjacent submodule increases by a preset voltage threshold within a second preset time, a step of determining that a bypass switch triggering failure occurs in the adjacent submodule is triggered;

[0015] If the capacitor voltage of the module capacitor of the adjacent submodule does not increase to the preset voltage threshold within the second preset time, the step of determining that no bypass switch triggering failure occurs in the adjacent submodule is triggered.

[0016] In order to solve the above technical problems, the present invention further provides a converter valve, comprising: a plurality of submodules, each of which comprises: a bypass switch, a converter module, a central control board, a main power supply, and a module capacitor;

[0017] The central control board is respectively connected to the control end of the bypass switch, the central control board of the adjacent submodule and the control end of the commutation module, the adjacent submodule includes: the previous adjacent submodule and / or the next adjacent submodule, and the central control board is used to implement the steps of the bypass switch refusal method as described above;

[0018] The positive electrode of the module capacitor is connected to the positive electrode of the main power supply, and the negative electrode is connected to the negative electrode of the main power supply;

[0019] The first end of the converter module is connected to the positive electrode of the module capacitor, and the second end is connected to the negative electrode of the module capacitor;

[0020] The first end of the bypass switch is respectively connected to the third end of the converter module and the output end of the previous adjacent submodule, the second end is respectively connected to the second end of the converter module and the input end of the next adjacent submodule, and the control end is connected to the central control board of the adjacent submodule, and is used for closing after receiving its own trigger signal sent by the central control board or an adjacent trigger signal sent by the central control board of the adjacent submodule.

[0021] Optionally, the bypass switch includes: a first energy storage capacitor, a first trigger switch, a first coil, and a contact;

[0022] The positive electrode of the first energy storage capacitor is connected to the positive electrode of the main power supply and the first end of the first coil, and the negative electrode is connected to the negative electrode of the main power supply;

[0023] The second end of the first coil is connected to the first end of the first trigger switch, the movable contact of the contact is respectively connected to the third end of the commutation module and the output end of the previous adjacent submodule, and the static contact of the contact is respectively connected to the second end of the commutation module and the input end of the next adjacent submodule, so that the movable contact and the static contact of the first contact are closed when the first coil is powered on;

[0024] The second end of the first trigger switch is connected to the negative electrode of the main power supply, and the control end is connected to the central control board and the central control board of the adjacent submodule, and is used to close after receiving the self-trigger signal or the adjacent trigger signal.

[0025] Optionally, it further includes: an auxiliary power supply; the positive electrode of the auxiliary power supply is respectively connected to the positive electrode of the module capacitor and the first end of the converter module, and the negative electrode is respectively connected to the negative electrode of the module capacitor and the second end of the converter module;

[0026] The bypass switch further includes: a second energy storage capacitor, a second trigger switch, and a second coil;

[0027] The positive electrode of the second energy storage capacitor is connected to the positive electrode of the auxiliary power supply and the first end of the second coil, and the negative electrode is connected to the negative electrode of the auxiliary power supply;

[0028] The second end of the second coil is connected to the first end of the second trigger switch, so that the moving contact and the static contact of the contact are closed when the second coil is powered on;

[0029] The second end of the second trigger switch is connected to the negative electrode of the auxiliary power supply, and the control end is connected to the central control board and the central control board of the adjacent submodule, and is used to close after receiving the self-trigger signal or the adjacent trigger signal.

[0030] Optionally, also include:

[0031] A filtering device, wherein the filtering device is respectively connected to the positive electrode of the main power supply, the positive electrode of the module capacitor and the first end of the commutation module, and is used for correspondingly filtering the electric energy transmitted from the module capacitor to the commutation module or the electric energy transmitted from the commutation module to the module capacitor.

[0032] Optionally, also include:

[0033] A current limiting device, wherein the current limiting device is respectively connected to the positive electrode of the main power supply, the positive electrode of the module capacitor and the first end of the commutation module, and is used for correspondingly limiting the current of the electric energy transmitted from the module capacitor to the commutation module or the electric energy transmitted from the commutation module to the module capacitor.

[0034] Optionally, the commutation module comprises: a first IGBT, a second IGBT, a first parasitic diode, and a second parasitic diode;

[0035] The gate of the first IGBT is connected to the central control board, the collector is respectively connected to the positive electrode of the module capacitor and the positive electrode of the main power supply, and the emitter is respectively connected to the collector of the second IGBT, the first end of the bypass switch and the output end of the previous adjacent submodule;

[0036] The anode of the first parasitic diode is connected to the emitter of the first IGBT, and the cathode is connected to the collector of the first IGBT;

[0037] The gate of the second IGBT is connected to the central control board, and the emitter is respectively connected to the second end of the bypass switch, the negative electrode of the module capacitor, the negative electrode of the main power supply and the input end of the next adjacent submodule, the emitter of the first IGBT is the positive input end of the commutation module and the collector of the second IGBT is the negative input end of the commutation module;

[0038] An anode of the second parasitic diode is connected to the emitter of the second IGBT, and a cathode of the second parasitic diode is connected to the collector of the second IGBT.

[0039] In order to solve the above technical problems, the present invention further provides a central control panel, comprising:

[0040] Memory for storing computer programs;

[0041] A processor is used to implement the steps of the bypass switch refusal method as described above when executing the computer program.

[0042] The purpose of the present invention is to provide a bypass switch refusal method, a converter valve and an electric control board. The central control board of any submodule in the converter valve will periodically send a preset signal to the central control board of the adjacent submodule, and determine whether the preset signal sent by the central control board of the adjacent submodule is not received for more than one cycle. If the preset signal sent by the central control board of the adjacent submodule is not received for more than one cycle, it is determined that a bypass switch triggering failure occurs in the adjacent submodule. At this time, the central control board will send an adjacent triggering signal to the bypass switch of the adjacent submodule, thereby controlling the bypass switch of the adjacent submodule to close, and timely bypassing the adjacent submodule with a fault, thereby improving the safety of the converter valve, and thereby ensuring the safety of the flexible direct current transmission system where the converter valve is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0044] Figure 1 A process flow chart of a bypass switch refusal method provided by the present invention;

[0045] Figure 2 A schematic diagram of a cross-communication function configuration provided by the present invention;

[0046] Figure 3 A schematic diagram of the principle of a redundant power supply provided by the present invention;

[0047] Figure 4 A schematic diagram of bypass switch cross-triggering and redundant power supply configuration provided by the present invention;

[0048] Figure 5 A schematic diagram of a redundant power supply structure provided by the present invention;

[0049] Figure 6 A schematic diagram of the structure of a submodule provided by the present invention;

[0050] Figure 7 This is a structural schematic diagram of a central control panel provided by the present invention. DETAILED DESCRIPTION

[0051] The core of the present invention is to provide a bypass switch refusal method, a converter valve and an electric control board. A communication network is constructed between the submodules and the adjacent submodules to monitor the fault conditions of the adjacent submodules. When a fault is detected in the adjacent submodule, an adjacent trigger signal is actively sent to control the bypass switch of the adjacent submodule to close, and the adjacent submodule with the fault is bypassed in time, thereby improving the safety of the converter valve and further ensuring the safety of the flexible DC transmission system where the converter valve is located.

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Please refer to Figure 1 , Figure 1 The present invention provides a process flow chart of a bypass switch 1 refusal method. The bypass switch 1 refusal method is applied to the central control board 3 of any submodule of the converter valve, and the method includes:

[0054] S11: periodically sending a preset signal to the central control board 3 of the submodule adjacent to the submodule in the converter valve, and determining whether the preset signal sent by the central control board 3 of the adjacent submodule has not been received for more than one period;

[0055] S12: If the preset signal sent by the central control board 3 of the adjacent submodule is not received for more than one period, it is determined that a bypass switch 1 triggering failure occurs in the adjacent submodule, and an adjacent triggering signal is sent to the bypass switch 1 of the adjacent submodule to control the bypass switch 1 of the adjacent submodule to close;

[0056] S13: If the preset signal sent by the central control board 3 of the adjacent submodule is not received for more than one period, it is determined that the bypass switch 1 triggering failure of the adjacent submodule does not occur.

[0057] In the present invention, considering that each submodule in the existing converter valve operates independently, when a submodule fails, it cannot be bypassed in time, thereby causing a failure in the flexible direct current transmission system where the converter valve is located. Therefore, in this scheme, the central control board 3 of each submodule can periodically send a preset signal to the central control board 3 of the adjacent submodule, and determine whether the preset signal sent by the central control board 3 of the adjacent submodule has not been received for more than one cycle. If the preset signal sent by the central control board 3 of the adjacent submodule has not been received for more than one cycle, it is determined that the bypass switch 1 of the adjacent submodule has triggered a fault. At this time, the central control board 3 will send an adjacent trigger signal to the bypass switch 1 of the adjacent submodule, thereby controlling the bypass switch 1 of the adjacent submodule to close, and bypass the faulty submodule in time, thereby improving the safety of the scheme.

[0058] It should be noted that the new submodule uses cross communication to communicate with the valve control. The principle is as follows Figure 2 As shown, SM is a submodule, and the set of all SMs is a converter valve. The valve control and two submodules form a local communication network, and the control information and feedback information are double-backed up through optical fiber local networking. When any submodule has an abnormal communication condition with the valve control, it can communicate with the valve control indirectly through the cross communication path with the adjacent submodule. This design can greatly reduce the probability of black modules or submodules being bypassed due to communication failures, and change the submodule communication failure from the original N-1 to N-2 failure.

[0059] The present embodiment provides a bypass switch 1 refusal method, a converter valve and an electric control board. The central control board 3 of any submodule in the converter valve will periodically send a preset signal to the central control board 3 of the adjacent submodule, and determine whether the preset signal sent by the central control board 3 of the adjacent submodule is not received for more than one cycle. If the preset signal sent by the central control board 3 of the adjacent submodule is not received for more than one cycle, it is determined that a bypass switch 1 triggering failure occurs in the adjacent submodule. At this time, the central control board 3 will send an adjacent triggering signal to the bypass switch 1 of the adjacent submodule, thereby controlling the bypass switch 1 of the adjacent submodule to close, and timely bypass the adjacent submodule with the fault, thereby improving the safety of the converter valve, and thereby ensuring the safety of the flexible direct current transmission system where the converter valve is located.

[0060] Based on the above embodiments:

[0061] As an optional embodiment, before determining that a bypass switch 1 triggering failure occurs in an adjacent submodule, the method further includes:

[0062] Determine whether a preset signal sent by the central control board 3 of the adjacent submodule is not received for a first preset time after one cycle;

[0063] If the preset signal sent by the central control board 3 of the adjacent submodule is not received for a first preset time after one cycle, the step of determining that a bypass switch 1 triggering failure occurs in the adjacent submodule is triggered;

[0064] If the preset signal sent by the central control board 3 of the adjacent submodule is not received for a first preset time after one cycle, the step of determining whether the bypass switch 1 triggering failure of the adjacent submodule occurs is triggered.

[0065] In the present invention, considering that the central control board 3 is prone to errors when receiving signals in actual applications, this scheme will additionally determine whether the preset signal sent by the central control board 3 of the adjacent sub-module is not received for a first preset time after a cycle. If the preset signal sent by the central control board 3 of the adjacent sub-module is not received for a first preset time after a cycle, it is determined that a bypass switch 1 triggering failure does occur in the adjacent sub-module; conversely, if the preset signal sent by the central control board 3 of the adjacent sub-module is not received for a first preset time after a cycle, it is determined that a bypass switch 1 triggering failure does not occur in the adjacent sub-module, thereby improving the accuracy of the judgment and avoiding erroneous closing control of the bypass switch 1 of the adjacent sub-module due to signal reception errors.

[0066] As an optional embodiment, if no adjacent state signal is received for a first preset time after a cycle, the method further includes:

[0067] Determine whether the capacitor voltage of the module capacitor 5 of the adjacent submodule increases by a preset voltage threshold within a second preset time;

[0068] If the capacitor voltage of the module capacitor 5 of the adjacent submodule increases by a preset voltage threshold within the second preset time, a step of determining that a bypass switch 1 triggering failure occurs in the adjacent submodule is triggered;

[0069] If the capacitor voltage of the module capacitor 5 of the adjacent submodule does not increase to the preset voltage threshold within the second preset time, the step of determining that no bypass switch 1 triggering failure occurs in the adjacent submodule is triggered.

[0070] In the present invention, Figure 3As shown, considering that when the central control board 3 of the adjacent submodule fails, in addition to being unable to send the preset signal, the module capacitor 5 will also increase the preset voltage threshold within the preset time, so this scheme will additionally determine whether the capacitor voltage of the module capacitor 5 of the adjacent submodule increases the preset voltage threshold within the second preset time. If the capacitor voltage of the module capacitor 5 of the adjacent submodule increases the preset voltage threshold within the second preset time, it is determined that the bypass switch 1 triggering failure of the adjacent submodule has indeed occurred; conversely, if the capacitor voltage of the module capacitor 5 of the adjacent submodule does not increase the preset voltage threshold within the second preset time, it is determined that the bypass switch 1 triggering failure of the adjacent submodule has not occurred, which improves the accuracy of the judgment and avoids the erroneous closing control of the bypass switch 1 of the adjacent submodule due to signal reception errors.

[0071] In order to solve the above technical problems, the present invention further provides a converter valve, comprising: a plurality of submodules, each of which comprises: a bypass switch 1, a converter module 2, a central control board 3, a main power supply 4, and a module capacitor 5;

[0072] The central control board 3 is respectively connected to the control end of the bypass switch 1, the central control board 3 of the adjacent submodule and the control end of the commutation module 2, and the adjacent submodule includes: the previous adjacent submodule and / or the next adjacent submodule. The central control board 3 is used to implement the steps of the bypass switch 1 rejection method as described above;

[0073] The positive electrode of the module capacitor 5 is connected to the positive electrode of the main power supply 4, and the negative electrode is connected to the negative electrode of the main power supply 4;

[0074] The first end of the commutation module 2 is connected to the positive electrode of the module capacitor 5, and the second end is connected to the negative electrode of the module capacitor 5;

[0075] The first end of the bypass switch 1 is respectively connected to the third end of the inverter module 2 and the output end of the previous adjacent submodule, the second end is respectively connected to the second end of the inverter module 2 and the input end of the next adjacent submodule, and the control end is connected to the central control board 3 of the adjacent submodule, and is used to close after receiving its own trigger signal sent by the central control board 3 or the adjacent trigger signal sent by the central control board 3 of the adjacent submodule.

[0076] The converter valve provided in this embodiment corresponds to the above method, and thus has the same beneficial effects as the above method. Therefore, for the embodiments of the converter valve part, please refer to the description of the embodiments of the method part, which will not be repeated here.

[0077] As an optional embodiment, the bypass switch 1 includes: a first energy storage capacitor, a first trigger switch, a first coil, and a contact;

[0078] The positive electrode of the first energy storage capacitor is connected to the positive electrode of the main power supply 4 and the first end of the first coil, and the negative electrode is connected to the negative electrode of the main power supply 4;

[0079] The second end of the first coil is connected to the first end of the first trigger switch, the moving contact of the contact is respectively connected to the third end of the commutation module 2 and the output end of the previous adjacent submodule, and the static contact of the contact is respectively connected to the second end of the commutation module 2 and the input end of the next adjacent submodule, so that the moving contact and the static contact of the first contact are closed when the first coil is powered on;

[0080] The second end of the first trigger switch is connected to the negative pole of the main power supply 4, and the control end is connected to the central control board 3 and the central control board 3 of the adjacent submodule, and is used to close after receiving its own trigger signal or an adjacent trigger signal.

[0081] In the present invention, the bypass switch 1 is provided with a first energy storage capacitor, a first trigger switch, a first coil, and contacts, wherein the first trigger switch can be closed based on a trigger signal sent by the submodule or a trigger signal sent by an adjacent submodule. When a fault occurs in the submodule, the adjacent submodule can also control the first trigger switch to close, so that the first coil is energized, thereby closing the moving contact and the static contact of the contact, thereby bypassing the faulty submodule in time.

[0082] As an optional embodiment, it further includes: an auxiliary power supply; the positive electrode of the auxiliary power supply is respectively connected to the positive electrode of the module capacitor 5 and the first end of the converter module 2, and the negative electrode is respectively connected to the negative electrode of the module capacitor 5 and the second end of the converter module 2;

[0083] The bypass switch 1 further includes: a second energy storage capacitor, a second trigger switch, and a second coil;

[0084] The positive electrode of the second energy storage capacitor is connected to the positive electrode of the auxiliary power supply and the first end of the second coil, and the negative electrode is connected to the negative electrode of the auxiliary power supply;

[0085] The second end of the second coil is connected to the first end of the second trigger switch, so that the moving contact and the stationary contact of the contact are closed when the second coil is powered on;

[0086] The second end of the second trigger switch is connected to the negative pole of the auxiliary power supply, and the control end is connected to the central control board 3 and the central control board 3 of the adjacent submodule, and is used to close after receiving its own trigger signal or an adjacent trigger signal.

[0087] In the present invention, considering that the main power supply 4 may fail as the working time of the converter valve increases, the bypass switch 1 in this scheme is also provided with a second energy storage capacitor, a second trigger switch, and a second coil, wherein the second trigger switch can also be closed based on the trigger signal sent by the submodule or the trigger signal sent by the adjacent submodule. When the submodule fails, if the main power supply 4 also fails, the adjacent submodule can control the trigger switch to close, thereby controlling the second coil to be energized, thereby closing the moving contacts and the static contacts of the contacts, and still being able to bypass the failed submodule in time.

[0088] It should be noted that the new submodule uses a redundant trigger circuit to drive the bypass switch 1. Two completely independent trigger circuit systems are set up inside. The two energy storage capacitors are powered by the power board and the redundant power supply circuit respectively. The schematic diagram is shown in Figure 4 When a module fails, the two trigger circuits simultaneously send closing trigger signals and output closing currents, driving the iron core, insulating structure and moving contact to complete the closing action of bypass switch 1, thus avoiding system tripping or locking caused by a single submodule failure.

[0089] It should also be noted that the new submodule adopts the bypass switch 1 cross-triggering function and is equipped with an auxiliary power supply. The specific principle is as follows Figure 5 As shown. When the submodule cannot trigger bypass switch 1 through software, the adjacent submodule can trigger bypass switch 1 of the faulty submodule through cross-connection optical fiber, which can improve the reliability of the bypass function. At the same time, the adjacent submodule can also receive the bypass status of the faulty submodule through cross-connection optical fiber. The cross-triggering and reporting functions need to be used in conjunction with the local redundancy of the energy-taking power supply to solve the bypass refusal and black module problems under power failure.

[0090] As an optional embodiment, it also includes:

[0091] The filtering device is respectively connected to the positive electrode of the main power supply 4, the positive electrode of the module capacitor 5 and the first end of the commutation module 2, and is used to perform corresponding filtering on the electric energy transmitted from the module capacitor 5 to the commutation module 2 or the electric energy transmitted from the commutation module 2 to the module capacitor 5.

[0092] In the present invention, considering the fluctuations in the electric energy of the main power supply 4, the coil of the main switch may not be energized in time, so a filtering device is also provided in the present solution to perform corresponding filtering on the electric energy transmitted from the main power supply 4 to the bypass switch 1, so that the filtered electric energy can be stably transmitted to the coil of the main switch, thereby improving the speed of the bypass process.

[0093] As an optional embodiment, it also includes:

[0094] A current limiting device, which is respectively connected to the positive electrode of the main power supply 4, the positive electrode of the module capacitor 5 and the first end of the converter module 2, and is used to perform corresponding current limiting on the electric energy transmitted from the module capacitor 5 to the converter module 2 or the electric energy transmitted from the converter module 2 to the module capacitor 5.

[0095] In the present invention, considering that there is voltage fluctuation in the electric energy of the main power supply 4, which is not conducive to the coil being energized, a current limiting device is also provided in the present scheme to perform corresponding current limiting on the electric energy transmitted from the main power supply 4 to the bypass switch 1, so that the electric energy after current limiting can be stably transmitted to the coil of the main switch, thereby increasing the speed of the bypass process.

[0096] As an optional embodiment, the commutation module 2 includes: a first IGBTVT1, a second IGBTVT2, a first parasitic diode VD1, and a second parasitic diode VD2;

[0097] The gate of the first IGBTVT1 is connected to the central control board 3, the collector is respectively connected to the positive electrode of the module capacitor 5 and the positive electrode of the main power supply 4, and the emitter is respectively connected to the collector of the second IGBTVT2, the first end of the bypass switch 1 and the output end of the previous adjacent submodule;

[0098] The anode of the first parasitic diode VD1 is connected to the emitter of the first IGBTVT1, and the cathode is connected to the collector of the first IGBTVT1;

[0099] The gate of the second IGBTVT2 is connected to the central control board 3, and the emitter is respectively connected to the second end of the bypass switch 1, the negative electrode of the module capacitor 5, the negative electrode of the main power supply 4 and the input end of the next adjacent submodule, the emitter of the first IGBTVT1 is the positive input end of the commutation module 2 and the collector of the second IGBTVT2 is the negative input end of the commutation module 2;

[0100] The anode of the second parasitic diode VD2 is connected to the emitter of the second IGBTVT2 , and the cathode is connected to the collector of the second IGBTVT2 .

[0101] In the present invention, Figure 6 As shown, the commutation module 2 is provided with: a first IGBT (Insulated Gate Bipolar Transistor) VT1, a second IGBT VT2, a first parasitic diode VD1, and a second parasitic diode VD2, wherein the first IGBT VT1 and the second IGBT VT2 are controlled by the central control board 3 of the submodule and the central control board 3 of the adjacent submodule to be closed and opened accordingly to achieve the commutation function, and the first parasitic diode VD1 and the second parasitic diode VD2 are used to ensure the safety of the first IGBT VT1 and the second IGBT VT2 when the power supply is reversely connected, thereby improving the reliability and safety of the solution.

[0102] Please refer to Figure 7 , Figure 7 This is a structural schematic diagram of a central control board 3 provided by the present invention. The central control board 3 includes:

[0103] A memory 20, used for storing computer programs;

[0104] The processor 21 is used to implement the steps of the bypass switch 1 refusal method as described above when executing a computer program.

[0105] The central control panel 3 provided in this embodiment may include but is not limited to a smart phone, a tablet computer, a laptop computer or a desktop computer.

[0106] Among them, the processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 can be implemented in at least one hardware form of a digital signal processor (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a central processing unit (CPU); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 21 may be integrated with a graphics processing unit (GPU), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 21 may also include an artificial intelligence (AI) processor, which is used to process computing operations related to machine learning.

[0107] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used to store the following computer program 201, wherein, after the computer program is loaded and executed by the processor 21, it can implement the relevant steps of the bypass switch 1 refusal method disclosed in any of the aforementioned embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, etc., and the storage method may be temporary storage or permanent storage. Among them, the operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include but is not limited to the bypass switch 1 refusal method, etc.

[0108] In some embodiments, the central control board 3 may further include a display screen 22 , an input / output interface 23 , a communication interface 24 , a power supply 25 , and a communication bus 26 .

[0109] Those skilled in the art will understand that Figure 4 The structure shown in the figure does not constitute a limitation on the central control panel 3, and may include more or fewer components than those shown in the figure.

[0110] The purpose of this embodiment is to provide a central control board 3, in which the memory 20 is used to store computer programs, and the processor 21 is used to implement the steps of the bypass switch 1 rejection method when executing the computer program, so as to make the control process more efficient and accurate.

[0111] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0112] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bypass switch refusal method, characterized in that: Applied to a central control board of any submodule of a converter valve, the method comprises: Periodically sending a preset signal to a central control board of a submodule adjacent to the submodule in the converter valve, and determining whether the preset signal sent by the central control board of the adjacent submodule is not received for more than one period; If the preset signal sent by the central control board of the adjacent submodule is not received for more than one period, it is determined that a bypass switch triggering failure occurs in the adjacent submodule, and an adjacent triggering signal is sent to the bypass switch of the adjacent submodule to control the bypass switch of the adjacent submodule to close; If the preset signal sent by the central control board of the adjacent submodule is not received for more than one period, it is determined that no bypass switch triggering failure occurs in the adjacent submodule.

2. The bypass switch refusal method according to claim 1, characterized in that: Before determining that a bypass switch triggering failure occurs in the adjacent submodule, the method further includes: Determine whether a preset signal sent by the central control board of the adjacent submodule is not received for a first preset time after the one cycle; If the preset signal sent by the central control board of the adjacent submodule is not received for a first preset time after the one cycle, triggering the step of determining that a bypass switch triggering failure occurs in the adjacent submodule; If the preset signal sent by the central control board of the adjacent submodule is not received for a first preset time after the one cycle, the step of determining whether the bypass switch triggering failure of the adjacent submodule occurs is triggered.

3. The bypass switch refusal method according to claim 2, characterized in that: If the neighboring state signal is not received for a first preset time after the one cycle, the method further includes: Determine whether the capacitor voltage of the module capacitor of the adjacent submodule increases by a preset voltage threshold within a second preset time; If the capacitor voltage of the module capacitor of the adjacent submodule increases by a preset voltage threshold within a second preset time, a step of determining that a bypass switch triggering failure occurs in the adjacent submodule is triggered; If the capacitor voltage of the module capacitor of the adjacent submodule does not increase to the preset voltage threshold within the second preset time, the step of determining that no bypass switch triggering failure occurs in the adjacent submodule is triggered.

4. A flow control valve, characterized in that: include: Several submodules, each of which includes: a bypass switch, a commutation module, a central control board, a main power supply, and a module capacitor; The central control board is respectively connected to the control end of the bypass switch, the central control board of the adjacent submodule and the control end of the commutation module, the adjacent submodule includes: the previous adjacent submodule and / or the next adjacent submodule, and the central control board is used to implement the steps of the bypass switch refusal method according to any one of claims 1 to 3; The positive electrode of the module capacitor is connected to the positive electrode of the main power supply, and the negative electrode is connected to the negative electrode of the main power supply; The first end of the converter module is connected to the positive electrode of the module capacitor, and the second end is connected to the negative electrode of the module capacitor; The first end of the bypass switch is respectively connected to the third end of the converter module and the output end of the previous adjacent submodule, the second end is respectively connected to the second end of the converter module and the input end of the next adjacent submodule, and the control end is connected to the central control board of the adjacent submodule, and is used for closing after receiving its own trigger signal sent by the central control board or an adjacent trigger signal sent by the central control board of the adjacent submodule.

5. The flow control valve according to claim 4, characterized in that: The bypass switch comprises: a first energy storage capacitor, a first trigger switch, a first coil, and a contact; The positive electrode of the first energy storage capacitor is connected to the positive electrode of the main power supply and the first end of the first coil, and the negative electrode is connected to the negative electrode of the main power supply; The second end of the first coil is connected to the first end of the first trigger switch, the movable contact of the contact is respectively connected to the third end of the commutation module and the output end of the previous adjacent submodule, and the static contact of the contact is respectively connected to the second end of the commutation module and the input end of the next adjacent submodule, so that the movable contact and the static contact of the first contact are closed when the first coil is powered on; The second end of the first trigger switch is connected to the negative electrode of the main power supply, and the control end is connected to the central control board and the central control board of the adjacent submodule, and is used to close after receiving the self-trigger signal or the adjacent trigger signal.

6. The flow control valve according to claim 5, characterized in that: Also includes: Auxiliary power supply; the positive electrode of the auxiliary power supply is respectively connected to the positive electrode of the module capacitor and the first end of the converter module, and the negative electrode is respectively connected to the negative electrode of the module capacitor and the second end of the converter module; The bypass switch further includes: a second energy storage capacitor, a second trigger switch, and a second coil; The positive electrode of the second energy storage capacitor is connected to the positive electrode of the auxiliary power supply and the first end of the second coil, and the negative electrode is connected to the negative electrode of the auxiliary power supply; The second end of the second coil is connected to the first end of the second trigger switch, so that the moving contact and the static contact of the contact are closed when the second coil is powered on; The second end of the second trigger switch is connected to the negative electrode of the auxiliary power supply, and the control end is connected to the central control board and the central control board of the adjacent submodule, and is used to close after receiving the self-trigger signal or the adjacent trigger signal.

7. The flow control valve according to claim 4, characterized in that: Also includes: A filtering device, wherein the filtering device is respectively connected to the positive electrode of the main power supply, the positive electrode of the module capacitor and the first end of the commutation module, and is used for correspondingly filtering the electric energy transmitted from the module capacitor to the commutation module or the electric energy transmitted from the commutation module to the module capacitor.

8. The flow control valve according to claim 4, characterized in that: Also includes: A current limiting device, wherein the current limiting device is respectively connected to the positive electrode of the main power supply, the positive electrode of the module capacitor and the first end of the commutation module, and is used for correspondingly limiting the current of the electric energy transmitted from the module capacitor to the commutation module or the electric energy transmitted from the commutation module to the module capacitor.

9. The flow control valve according to any one of claims 4 to 8, characterized in that: The commutation module comprises: a first IGBT, a second IGBT, a first parasitic diode, and a second parasitic diode; The gate of the first IGBT is connected to the central control board, the collector is respectively connected to the positive electrode of the module capacitor and the positive electrode of the main power supply, and the emitter is respectively connected to the collector of the second IGBT, the first end of the bypass switch and the output end of the previous adjacent submodule; The anode of the first parasitic diode is connected to the emitter of the first IGBT, and the cathode is connected to the collector of the first IGBT; The gate of the second IGBT is connected to the central control board, and the emitter is respectively connected to the second end of the bypass switch, the negative electrode of the module capacitor, the negative electrode of the main power supply and the input end of the next adjacent submodule, the emitter of the first IGBT is the positive input end of the commutation module and the collector of the second IGBT is the negative input end of the commutation module; An anode of the second parasitic diode is connected to the emitter of the second IGBT, and a cathode of the second parasitic diode is connected to the collector of the second IGBT.

10. A central control panel, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of the bypass switch refusal method as described in any one of claims 1 to 3 when executing the computer program.

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