Online cross monitoring method and device for temperature of bypass switch of flexible straight valve power module

Abstract

According to the flexible straight valve power module bypass switch temperature online cross monitoring method and device provided by the invention, for each power module, the operation state of the power module can be determined according to the temperature of the bypass switch monitored by the temperature detection plate; the power module with the abnormal operation state can be used as a fault power module, the power module adjacently connected with the fault power module is used as an auxiliary power module, and a first control signal and a second control signal are generated; wherein the first control signal can be used for closing a bypass switch of the fault power module, so that the fault power module is cut off from the system; the second control signal can be used to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the failed power module. According to the invention, the method for carrying out temperature cross monitoring on the power modules is adopted, and the adjacent power modules can be used for carrying out temperature monitoring on the power modules which are bypassed due to the fault, so that the working state of the power module with the fault is monitored.

Description

Technical Field

[0001] The present application relates to the technical field of flexible direct current transmission, and in particular to a method and device for online cross-monitoring of the temperature of a bypass switch of a power module of a flexible direct current valve. Background Art

[0002] Flexible DC transmission system has the advantages of independent control of active / reactive power of converter station, no need for huge AC filter, support for black start of power grid, support for power supply to weak grids such as islands / wind farms, etc. It is an effective way to solve the problem of regional new energy grid connection and consumption. At present, when realizing voltage source DC transmission system, modular multi-converter (MMC converter) is usually used to build each bridge arm of the converter and the whole system by cascading multiple identical power modules.

[0003] Among them, the impedance and temperature of the bypass switch of the power module during the current flow process are important parameters reflecting its status. Therefore, in the flexible DC transmission system, it is crucial to monitor the working status of the bypass switch. However, when any power module in the system fails and is bypassed, the bypass switch will bear the load current. At this time, the capacitor voltage gradually discharges to zero, and the energy source and all the boards it supplies lose power and no longer work, resulting in the inability to monitor the working status of the bypass switch of the faulty power module. Summary of the invention

[0004] The purpose of the present application is to solve at least one of the above-mentioned technical defects, especially the technical defect in the prior art that when any power module in the system fails and is bypassed, the working status of the bypass switch of the failed power module cannot be monitored.

[0005] The present application provides a method for online cross-monitoring of bypass switch temperature of a flexible direct current valve power module, which is applied to a flexible direct current transmission system; the system comprises a plurality of power modules connected in series, each of which is provided with a control board, a bypass switch and a temperature detection board; the method comprises:

[0006] Monitoring the temperature of the bypass switch of each power module through each temperature detection board, and determining the operating state of each power module based on the temperature of each bypass switch;

[0007] When the operation state of a power module is abnormal, the abnormal power module is used as a faulty power module, and a power module connected adjacent to the faulty power module is used as an auxiliary power module, and a first control signal and a second control signal are generated;

[0008] Using the first control signal to drive the control board of the faulty power module to close the bypass switch of the faulty power module, so that the faulty power module is removed from the flexible direct current power transmission system;

[0009] The second control signal is used to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module.

[0010] Optionally, each power module further comprises a temperature sensor, wherein the temperature sensor is arranged on an output row of a bypass switch of the corresponding power module;

[0011] The method of monitoring the temperature of the bypass switch of each power module by each temperature detection board includes:

[0012] For each power module:

[0013] The temperature sensor of the power module is used to monitor the temperature of the bypass switch to obtain a temperature signal, and the temperature signal is transmitted to the temperature detection board;

[0014] The temperature detection board is used to perform signal analysis on the temperature signal to obtain the temperature of the bypass switch of the power module.

[0015] Optionally, the temperature detection board includes a signal conditioner, an analog-to-digital converter and a logic chip;

[0016] The step of performing signal analysis on the temperature signal by using the temperature detection board includes:

[0017] After the temperature signal is converted into an electrical signal by the signal conditioner, the electrical signal is converted into a digital signal by the analog-to-digital converter, and the digital signal is parsed into a temperature value by the logic chip.

[0018] Optionally, determining the operating state of each power module based on the temperature of each bypass switch includes:

[0019] For each bypass switch temperature, determining whether the bypass switch temperature is greater than a preset threshold;

[0020] If yes, it is determined that the operation state of the power module where the bypass switch is located is abnormal;

[0021] If not, it is determined that the operating state of the power module where the bypass switch is located is normal.

[0022] Optionally, each power module further includes an energy source, a transistor driving board, a switch trigger board, a half-bridge structure circuit and a DC support capacitor;

[0023] The method of using the first control signal to drive the control board of the faulty power module to close the bypass switch of the faulty power module includes:

[0024] Sending the first control signal to the control board of the faulty power module, so that after the control board generates a driving signal and a switch closing signal according to the first control signal, the driving signal is sent to the transistor driving board of the faulty power module, and the switch closing signal is sent to the switch trigger board of the faulty power module;

[0025] The transistor driving board is used to drive the half-bridge structure circuit of the faulty power module to perform power conversion according to the driving signal, and the converted power is transmitted to the energy supply of the faulty power module through the DC support capacitor of the faulty power module, so that the energy supply drives each component in the faulty power module;

[0026] And, the switch trigger board is used to close the bypass switch of the faulty power module according to the switch closing signal.

[0027] Optionally, using the second control signal to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module includes:

[0028] Sending the second control signal to the control board of the auxiliary power module, so that the control board controls the temperature detection board of the auxiliary power module to analyze the temperature signal transmitted by the temperature sensor of the faulty power module to obtain the temperature of the bypass switch of the faulty power module;

[0029] Wherein, the temperature detection board of the auxiliary power module is connected to the temperature sensor of the faulty power module by using a transmission line.

[0030] Optionally, the method further comprises:

[0031] Each power module is equipped with a temperature sensor. For each temperature sensor:

[0032] When the temperature sensor is a temperature measuring optical fiber probe, the temperature measuring optical fiber is used to connect the temperature measuring optical fiber probe to the power module where the temperature measuring optical fiber probe is located and the temperature detection board of the adjacent power module;

[0033] When the temperature sensor is a temperature measuring thermistor, a high voltage signal line is used to connect the temperature measuring thermistor to a temperature detection board of a power module adjacent to the temperature measuring thermistor.

[0034] The present application also provides a device for online cross-monitoring of bypass switch temperature of a flexible direct valve power module, comprising:

[0035] A temperature monitoring module, used to monitor the temperature of the bypass switch of each power module through each temperature detection board, and determine the operating state of each power module based on the temperature of each bypass switch;

[0036] A signal generating module, configured to, when the operating state of a power module is abnormal, regard the abnormal power module as a faulty power module, regard a power module adjacent to the faulty power module as an auxiliary power module, and generate a first control signal and a second control signal;

[0037] A first control module, configured to drive the control board of the faulty power module to close the bypass switch of the faulty power module by using the first control signal, so that the faulty power module is removed from the flexible DC power transmission system;

[0038] The second control module is used to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module by using the second control signal.

[0039] The present application also provides a storage medium, in which computer-readable instructions are stored. When the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the online cross-monitoring method of the temperature of the bypass switch of the flexible direct valve power module as described in any of the above embodiments.

[0040] The present application also provides a computer device, comprising: one or more processors, and a memory;

[0041] The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the method for online cross-monitoring of the temperature of the bypass switch of the flexible direct valve power module as described in any one of the above embodiments are performed.

[0042] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0043] The present application provides a method and device for online cross-monitoring of the temperature of a bypass switch of a flexible direct current valve power module. The method is applied to a flexible direct current transmission system, wherein the flexible direct current transmission system includes a plurality of power modules connected in series, and each power module is provided with a control board, a bypass switch and a temperature detection board. During the normal operation of the flexible direct current transmission system, the temperature of the bypass switch of each power module can be monitored by each temperature detection board, and the operating state of each power module can be determined based on the temperature of each bypass switch to ensure the safe and stable operation of the flexible direct current transmission system; when the operating state of a power module is abnormal, the abnormal power module can be regarded as a faulty power module, and the power module adjacent to the faulty power module can be regarded as an auxiliary power module, and a first control signal and a second control signal can be generated, so that a response can be made to the abnormal power module in time to reduce the safety hazards that occur during the operation of the system; then the first control signal can be used to drive the control board of the faulty power module to close the bypass switch of the faulty power module, so that the faulty power module is removed from the flexible direct current transmission system, thereby avoiding further expansion of the safety hazards caused by the faulty power module; at the same time, the second control signal can also be used to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module, thereby avoiding the loss of data of the faulty power module after the system removes the faulty power module. The present application adopts a method for cross-temperature monitoring of power modules. When a power module fails and is bypassed in the system, the temperature of the faulty power module can be monitored by using adjacent power modules, thereby monitoring the working status of the faulty power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Figure 1 A schematic flow chart of an online cross-monitoring method for the temperature of a bypass switch of a flexible direct valve power module provided in an embodiment of the present application;

[0046] Figure 2 A schematic diagram of the structure of a flexible direct current transmission system provided in an embodiment of the present application;

[0047] Figure 3 A schematic diagram of the structure of a power module provided in an embodiment of the present application;

[0048] Figure 4One of the structural schematic diagrams of a temperature monitoring module provided in an embodiment of the present application;

[0049] Figure 5 A second structural diagram of a temperature monitoring module provided in an embodiment of the present application;

[0050] Figure 6 A schematic diagram of connecting two adjacent power modules provided in an embodiment of the present application;

[0051] Figure 7 A schematic diagram of the structure of an online cross-monitoring device for the bypass switch temperature of a flexible direct valve power module provided in an embodiment of the present application;

[0052] Figure 8 A schematic diagram of the internal structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] The impedance and temperature of the bypass switch during the power module's current flow process are important parameters that reflect its status. Therefore, in the flexible DC transmission system, it is crucial to monitor the working status of the bypass switch. However, when any power module in the system fails and is bypassed, the bypass switch will bear the load current. At this time, the capacitor voltage gradually discharges to zero, and the energy source and all the boards it supplies lose power and no longer work, making it impossible to monitor the working status of the bypass switch of the faulty power module.

[0055] Based on this, this application proposes the following technical solutions, see below for details:

[0056] In one embodiment, Figure 1 As shown, Figure 1 A flow chart of a method for online cross-monitoring of bypass switch temperature of a flexible direct current valve power module provided in an embodiment of the present application; the present application provides a method for online cross-monitoring of bypass switch temperature of a flexible direct current valve power module, which is applied to a flexible direct current transmission system; specifically, it includes the following:

[0057] S110: Monitor the temperature of the bypass switch of each power module through each temperature detection board, and determine the operating state of each power module based on the temperature of each bypass switch.

[0058] In this step, since the flexible DC power transmission system includes multiple power modules connected in series, and each power module is provided with a bypass switch and a temperature detection board, for each power module, the valve control module of the flexible DC power transmission system can monitor the temperature of its bypass switch through the temperature detection board of the power module, and then determine the operating state of the power module based on the monitored temperature.

[0059] Indicatively, Figure 2 , Figure 3 As shown, Figure 2 A schematic diagram of the structure of a flexible direct current transmission system provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a power module provided in an embodiment of the present application. Figure 2 In the present application, the flexible DC transmission system is composed of multiple bridge arms connected in cascade, and each bridge arm is constructed by connecting multiple power modules with the same performance and structure in series. Furthermore, the structure of each power module is as follows: Figure 3 As shown, the present application can be divided from the functional level, dividing the power module into a secondary circuit and a primary circuit, and the secondary circuit is connected to the valve control module through an optical fiber. Here, the present application can control the secondary circuit through the valve control module so that the secondary circuit drives the primary circuit, thereby realizing the stable operation of the flexible DC power transmission system. Among them, the temperature detection board in the power module is arranged in the secondary circuit, and the bypass switch S1 is arranged in the primary circuit, and the temperature detection board is directly connected to the bypass switch S1, so the valve control module can monitor the temperature of the bypass switch through the temperature detection board.

[0060] It is understandable that the bypass switch in the power module is a key part of controlling the operation of the power module, which can control the flow direction of current and the output of voltage in the power module. In the power module, the bypass switch is a normally open switch, and when the bypass switch is closed, the power module can be short-circuited in the flexible DC power transmission system. Furthermore, the bypass switch will bear certain loads when working, and these loads will cause a certain amount of heat to be generated inside the bypass switch, thereby increasing the temperature. Therefore, the present application can reflect the load conditions borne by the bypass switch through the temperature of the bypass switch, and then determine the operating status of the power module where the bypass switch is located.

[0061] S120: When the operation status of a power module is abnormal, the abnormal power module is regarded as a faulty power module, and a power module adjacent to the faulty power module is regarded as an auxiliary power module, and a first control signal and a second control signal are generated.

[0062] In this step, after determining the operating status of each power module through step S110, the valve control module can treat the abnormal power module as a faulty power module and the power module adjacent to the faulty power module as an auxiliary power module when the operating status of the power module in the flexible direct current transmission system is abnormal, and generate a first control signal and a second control signal at the same time, so as to take countermeasures for the faulty power module and the auxiliary power module in time to ensure the stability and safety of the system.

[0063] It is understandable that when the operating state of a power module in the flexible DC power transmission system is abnormal, if appropriate measures are not taken in time to handle the abnormal power module, the fault point in the abnormal power module will be expanded, thereby affecting the reliability and stability of the entire flexible DC power transmission system. Therefore, after detecting that there is a faulty power module in the system, the present application can generate a first control signal and a second control signal, and use these two control signals to respectively control the faulty power module and the auxiliary power module, thereby ensuring the reliability and stability of the system.

[0064] S130: Using the first control signal to drive the control board of the faulty power module to close the bypass switch of the faulty power module, so that the faulty power module is removed from the flexible DC power transmission system.

[0065] In this step, after the first control signal is generated in step S120, the valve control module can use the first control signal to drive the control board of the faulty power module to close the bypass switch of the faulty power module so that the faulty power module is bypassed, thereby removing the faulty power module from the flexible DC transmission system.

[0066] It is understandable that if Figure 3 As shown, the secondary circuit in the power module may also include a control board. After generating a first control signal, the valve control module may send the first control signal to the control board, so that the control board closes the bypass switch of the faulty power module according to the first control signal, so that the faulty power module is bypassed. Since the voltage of the primary circuit will drop to zero after the faulty power module is bypassed, the secondary circuit of the faulty power module will stop working because it cannot obtain power from the primary circuit, thereby realizing the removal of the faulty power module from the flexible DC transmission system, thereby ensuring the reliability and stability of the system.

[0067] S140: Using the second control signal, the control board of the auxiliary power module drives the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module.

[0068] In this step, after the first control signal is generated in step S130, the valve control module can use the first control signal to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module, thereby realizing temperature cross-monitoring of the bypass switch in the power module in the flexible DC transmission system.

[0069] It is understandable that, after the faulty power module is bypassed, the voltage of the primary circuit in the faulty power module will drop to zero, and the temperature detection board in the secondary circuit will lose power and no longer work, so the valve control module cannot monitor the temperature of the bypass switch. At this time, in order to continue to obtain the temperature data of the bypass switch in the faulty power module, the present application can adopt a method of monitoring the temperature of the bypass switch of the faulty power module through the temperature detection board in the auxiliary power module adjacent to the faulty power module, so as to realize the temperature cross-monitoring of the bypass switch in the power module in the flexible DC transmission system.

[0070] In the above embodiment, during the normal operation of the flexible direct current transmission system, the temperature of the bypass switch of each power module can be monitored by each temperature detection board, and the operating state of each power module can be determined based on the temperature of each bypass switch to ensure the safe and stable operation of the flexible direct current transmission system; when the operating state of a power module is abnormal, the abnormal power module can be regarded as a faulty power module, and the power module adjacent to the faulty power module can be regarded as an auxiliary power module, and a first control signal and a second control signal can be generated, so that a response can be made to the abnormal power module in time to reduce the safety hazards that occur during the operation of the system; then, the first control signal can be used to drive the control board of the faulty power module to close the bypass switch of the faulty power module, so that the faulty power module is removed from the flexible direct current transmission system, thereby avoiding further expansion of the safety hazards caused by the faulty power module; at the same time, the second control signal can also be used to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module, so as to avoid data loss of the faulty power module after the system removes the faulty power module. The present application adopts a method for cross-temperature monitoring of power modules. When a power module fails and is bypassed in the system, the temperature of the faulty power module can be monitored by using adjacent power modules, thereby monitoring the working status of the faulty power module.

[0071] In one embodiment, monitoring the temperature of the bypass switch of each power module by each temperature detection board in step S110 may include:

[0072] S111: For each power module, a temperature sensor of the power module is used to monitor the temperature of the bypass switch to obtain a temperature signal, and the temperature signal is transmitted to a temperature detection board.

[0073] S112: Analyze the temperature signal using the temperature detection board to obtain the temperature of the bypass switch of the power module.

[0074] In this embodiment, the flexible direct current transmission system may further include a temperature sensor. When the valve control module monitors the temperature of the bypass switch of each power module, for each power module, the valve control module may use the temperature sensor of the power module to monitor the temperature of the bypass switch, obtain a temperature signal, and transmit the temperature signal to the temperature detection board. Then, the valve control module may use the temperature detection board to perform signal analysis on the temperature signal, thereby obtaining the temperature of the bypass switch of the power module.

[0075] It is understandable that, since the output row of the bypass switch in the power module is the part of the circuit responsible for outputting current and voltage, the present application can set the temperature sensor on the output row of the bypass switch to improve the accuracy of the bypass switch temperature monitoring results. In detail, after the present application sets the temperature sensor on the output row of the bypass switch, the valve control module can directly monitor the temperature change of the bypass switch through the temperature sensor, so as to timely discover the problem of bypass switch temperature overheating caused by power module failure, and take measures to deal with it, so as to avoid damage to other components caused by power module failure.

[0076] In one embodiment, the step S112 of using the temperature detection board to analyze the temperature signal may include:

[0077] S1121: After the temperature signal is converted into an electrical signal by a signal conditioner, an analog-to-digital converter is used to convert the electrical signal into a digital signal, and a logic chip is used to resolve the digital signal into a temperature value.

[0078] In this embodiment, the temperature detection board may include a signal conditioner, an analog-to-digital converter and a logic chip. Therefore, when the valve control module uses the temperature detection board to analyze the temperature signal, it can first convert the temperature signal into an electrical signal through the signal conditioner, then use the analog-to-digital converter to convert the electrical signal into a digital signal, and use the logic chip to analyze the digital signal into a temperature value.

[0079] Indicatively, Figure 4 , Figure 5 As shown, Figure 4 One of the structural schematic diagrams of a temperature monitoring module provided in an embodiment of the present application; Figure 5 The second structural diagram of a temperature monitoring module provided in an embodiment of the present application; Figure 4 and Figure 5In the embodiment, the temperature monitoring module can be composed of a temperature sensor, a temperature detection board, a main control board and a valve control module connected in sequence. Among them, one end of the signal conditioner is connected to the temperature sensor, and the other end is connected to the analog-to-digital converter. The other end of the analog-to-digital converter is connected to the logic chip, and the other end of the logic chip can be connected to the control board of the power module. Therefore, after receiving the temperature signal from the temperature sensor, the temperature detection board can convert the temperature signal into a temperature value and send it to the valve control module through the control board.

[0080] Specifically, the logic chip of the temperature detection board in the present application can adopt FPGA (Field-Programmable Gate Array). FPGA is a programmable logic device, which belongs to a kind of integrated circuit and can be converted and reconfigured after design. Its main function is to realize high-speed, high-flexibility and reconfigurable digital signal processing and control by converting the digital logic function design into hardware circuit implementation. Therefore, the present application can adopt FPGA as the logic chip of the temperature detection board, so that the FPGA can be programmed and reconfigured according to the functions and performance of the flexible DC transmission system.

[0081] In one embodiment, determining the operating state of each power module based on the temperature of each bypass switch in step S110 may include:

[0082] S113: for each bypass switch temperature, determine whether the bypass switch temperature is greater than a preset threshold; if so, execute step S114; if not, execute step S115.

[0083] S114: Determine that the operating state of the power module where the bypass switch is located is abnormal.

[0084] S115: Determine that the operating status of the power module where the bypass switch is located is normal.

[0085] In this embodiment, when determining the operating status of each power module, the valve control module can determine whether the temperature of the bypass switch in each power module is greater than a preset threshold; if so, it can be determined that the operating status of the power module where the bypass switch is located is abnormal; if not, it can be determined that the operating status of the power module where the bypass switch is located is normal.

[0086] It is understandable that when a power module fails, the bypass switch will generate more heat, causing the temperature to rise. Therefore, the excessive temperature of the bypass switch can be used as a precursor to a power module failure, thereby enabling early detection and processing of the failure problem, thereby ensuring the stability and safety of the system. Based on this, the present application can set a corresponding preset threshold value according to the function and performance of the flexible direct current transmission system, and reflect the operating status of the power module according to the preset threshold value.

[0087] Specifically, when the temperature of the bypass switch is greater than the preset threshold, it means that there is a fault in the power module, causing the temperature of the bypass switch to rise abnormally. At this time, there is a problem with the stability of the power module. Therefore, the valve control module can determine that the operating status of the power module where the bypass switch is located is abnormal; when the temperature of the bypass switch is not greater than the preset threshold, it means that the temperature of the bypass switch in the power module is stable within a reasonable safety range. At this time, the stability of the power module is better, so the valve control module can determine that the operating status of the power module where the bypass switch is located is normal.

[0088] In one embodiment, in step S130, using the first control signal to drive the control board of the faulty power module to close the bypass switch of the faulty power module may include:

[0089] S131: Send a first control signal to the control board of the faulty power module, so that after the control board generates a drive signal and a switch closing signal according to the first control signal, the drive signal is sent to the transistor drive board of the faulty power module, and the switch closing signal is sent to the switch trigger board of the faulty power module.

[0090] S132: Use the transistor driving board to drive the half-bridge structure circuit of the faulty power module to perform power conversion according to the driving signal, and transmit the converted power to the energy supply of the faulty power module through the DC support capacitor of the faulty power module, so that the energy supply drives each component in the faulty power module.

[0091] S133: Using the switch trigger board to close the bypass switch of the faulty power module according to the switch closing signal.

[0092] In this step, the power module of the flexible direct current transmission system may further include an energy supply, a transistor driving board, a switch trigger board, a half-bridge structure circuit, a DC support capacitor and a bypass switch; when the valve control module drives the control board of the faulty power module to close the bypass switch of the faulty power module, the first control signal may be sent to the control board of the faulty power module, so that after the control board generates a driving signal and a switch closing signal according to the first control signal, the driving signal is sent to the transistor driving board of the faulty power module, and the switch closing signal is sent to the switch trigger board of the faulty power module; then the valve control module may use the transistor driving board to drive the half-bridge structure circuit of the faulty power module according to the driving signal to perform power conversion, and transmit the converted power to the energy supply of the faulty power module through the DC support capacitor of the faulty power module, so that the energy supply drives each component in the faulty power module, and finally the valve control module may use the switch trigger board to close the bypass switch of the faulty power module according to the switch closing signal.

[0093] Indicatively, Figure 3 As shown, in addition to the control board and the temperature detection board, the secondary circuit in the power module is also provided with an energy source, a switch trigger board and two transistor drive boards, wherein the control board is respectively connected to the energy source, the switch trigger board and the two transistor drive boards, and in addition, the energy source is also respectively connected to the temperature detection board, the switch trigger board and the two transistor drive boards. In addition to the bypass switch, the primary circuit is also provided with a half-bridge structure circuit composed of two IGBTs (Insulated Gate Bipolar Transistor) T1 and T2 and a DC support capacitor C1, wherein the DC side of the half-bridge structure circuit is connected to the DC support capacitor C1, and the AC side is connected in parallel with the bypass switch. Furthermore, in the primary circuit and the secondary circuit of the power module, two transistor driving boards are respectively connected to two IGBT transistors T1 and T2 to drive the half-bridge structure circuit for power conversion; the switch trigger board is connected to the bypass switch to control the opening and closing of the bypass switch; and the energy-taking power supply is respectively connected to the two ends of the DC support capacitor C1 through two connecting lines to extract the power in the DC support capacitor C1, and convert the extracted power into voltage to drive various components in the power module, including the control board, the transistor driving board, the switch trigger board and the temperature detection board. For example, in a power module of a flexible DC transmission system, the energy-taking power supply can extract power from the DC support capacitor and convert it into a corresponding power supply voltage, wherein the power supply voltage provided to the control board is 15V, the power supply voltage provided to the transistor driving board is 15V, the power supply voltage provided to the switch trigger board is 400V, and the power supply voltage provided to the temperature detection board is 15V.

[0094] Therefore, under the mutual cooperation and constraints of the various components of the DC converter valve under this structure, the present application can, when the control signal of the faulty power module is lost, transmit a control signal from another adjacent power module to control the bypass switch of the faulty power module, thereby cutting off the faulty power module from the main circuit, thereby reducing the safety hazards of the flexible DC converter valve during operation.

[0095] In one embodiment, in step S140, using the second control signal to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module may include:

[0096] S141: Sending a second control signal to the control board of the auxiliary power module, so that the control board controls the temperature detection board of the auxiliary power module to analyze the temperature signal transmitted by the temperature sensor of the faulty power module to obtain the temperature of the bypass switch of the faulty power module.

[0097] In this embodiment, the present application can use a transmission line to connect the temperature detection board of the auxiliary power module in the flexible direct current transmission system with the temperature sensor of the faulty power module. Therefore, the valve control module can use the second control signal to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module. In detail, the valve control module can send the second control signal to the control board of the auxiliary power module, so that the control board controls the temperature detection board of the auxiliary power module to parse the temperature signal transmitted by the temperature sensor of the faulty power module, thereby obtaining the temperature of the bypass switch of the faulty power module. In this way, the present application can use the adjacent power module to monitor the temperature of the faulty power module when a power module fails and is bypassed in the system, thereby realizing the monitoring of the working state of the faulty power module.

[0098] Indicatively, Figure 6 As shown, Figure 6 A schematic diagram of connecting two adjacent power modules provided in an embodiment of the present application; Figure 6 The example is any two adjacently connected power modules in the flexible DC power transmission system. In one of the power modules, its temperature detection board 1 can be connected to the temperature sensor 4 of another power module through optical fiber. Similarly, the temperature detection board 2 of the other power module can be connected to the temperature sensor 3 of the power module through optical fiber. Therefore, when one of the power modules is bypassed, causing the temperature detection board to lose power and unable to receive the temperature signal of the temperature sensor, the valve control module can receive the temperature signal of the bypassed power module through the temperature detection board in the adjacently connected power module.

[0099] In one embodiment, the method may further include:

[0100] S150: When the temperature sensor is a temperature measuring optical fiber probe, the temperature measuring optical fiber is used to connect the temperature measuring optical fiber probe to the power module where the temperature measuring optical fiber probe is located and the temperature detection board of the adjacent power module.

[0101] S160: When the temperature sensor is a temperature measuring thermistor, a high-voltage signal line is used to connect the temperature measuring thermistor to a temperature detection board of a power module adjacent to the temperature measuring thermistor.

[0102] In this embodiment, the temperature sensor in the flexible DC power transmission system can be a temperature measuring fiber optic probe or a temperature measuring thermistor. When the temperature sensor is a temperature measuring fiber optic probe, a temperature measuring optical fiber can be used to connect the temperature measuring fiber optic probe to the power module where the temperature measuring fiber optic probe is located and the temperature detection board of the adjacent power module. When the temperature sensor is a temperature measuring thermistor, a high-voltage signal line can be used to connect each temperature measuring thermistor to the temperature detection board of the power module adjacent to the temperature measuring thermistor.

[0103] Indicatively, Figure 4 , 5 As shown, Figure 4 The temperature sensor used in the temperature monitoring module shown in is a temperature measuring fiber probe. Since the temperature measuring fiber is a non-conductor material, there is no high-voltage insulation problem caused by the different potentials of adjacent power modules, so the temperature measuring fiber probe can be directly connected to the power module where the temperature measuring fiber probe is located and the temperature detection board of the adjacent power module using the temperature measuring fiber. When the temperature sensor connected to the temperature detection board is a temperature measuring fiber probe, the temperature detection board can be directly powered by an energy-taking power supply, so that the temperature detection board obtains a temperature signal from the temperature sensor in the adjacent power module through the temperature measuring fiber, and forwards the temperature signal to the valve control module through the control board after converting the temperature signal into a temperature value.

[0104] besides, Figure 5 The temperature sensor used in the temperature monitoring module shown in is a temperature measuring thermistor. Since the temperature signal transmitted by the temperature measuring thermistor is an electrical signal, and the potentials of two adjacent power modules are different, it is necessary to isolate the temperature signal with high voltage. To this end, a high-voltage isolation power supply can be added to the temperature detection board so that the temperature detection board can be connected to the energy-taking power supply through the high-voltage isolation power supply to isolate the high voltage of the two adjacent power modules. At the same time, a high-voltage signal line is used to connect the temperature measuring thermistor to the temperature detection board of the power module adjacent to the temperature measuring thermistor, and the temperature detection board and the control board can be connected by optical fiber. It should be noted that since the temperature sensor adopts the temperature measuring thermistor, there is a potential insulation problem in the power module. Therefore, the temperature detection board of this embodiment does not perform temperature monitoring on the bypass switch of the power module where the temperature detection board is located.

[0105] The following describes the online cross-monitoring device for the temperature of the bypass switch of the flexible direct-flow valve power module provided in an embodiment of the present application. The online cross-monitoring device for the temperature of the bypass switch of the flexible direct-flow valve power module described below and the online cross-monitoring method for the temperature of the bypass switch of the flexible direct-flow valve power module described above can be referred to each other.

[0106] In one embodiment, Figure 7 As shown, Figure 7 The present invention provides a schematic diagram of a structure of a device for online cross-monitoring of bypass switch temperature of a flexible direct-flow valve power module provided in an embodiment of the present invention; the present invention also provides a device for online cross-monitoring of bypass switch temperature of a flexible direct-flow valve power module, including a temperature monitoring module 210, a signal generating module 220, a first control module 230 and a second control module 240, which specifically include the following:

[0107] The temperature monitoring module 210 is used to monitor the temperature of the bypass switch of each power module through each temperature detection board, and determine the operating state of each power module based on the temperature of each bypass switch.

[0108] The signal generating module 220 is used to, when the operating state of a power module is abnormal, regard the abnormal power module as a faulty power module, regard the power module adjacent to the faulty power module as an auxiliary power module, and generate a first control signal and a second control signal.

[0109] The first control module 230 is used to drive the control board of the faulty power module to close the bypass switch of the faulty power module by using the first control signal, so that the faulty power module is removed from the flexible DC power transmission system.

[0110] The second control module 240 is used to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module by using the second control signal.

[0111] In the above embodiment, during the normal operation of the flexible direct current transmission system, the temperature of the bypass switch of each power module can be monitored by each temperature detection board, and the operating state of each power module can be determined based on the temperature of each bypass switch to ensure the safe and stable operation of the flexible direct current transmission system; when the operating state of a power module is abnormal, the abnormal power module can be regarded as a faulty power module, and the power module adjacent to the faulty power module can be regarded as an auxiliary power module, and a first control signal and a second control signal can be generated, so that a response can be made to the abnormal power module in time to reduce the safety hazards that occur during the operation of the system; then, the first control signal can be used to drive the control board of the faulty power module to close the bypass switch of the faulty power module, so that the faulty power module is removed from the flexible direct current transmission system, thereby avoiding further expansion of the safety hazards caused by the faulty power module; at the same time, the second control signal can also be used to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module, so as to avoid data loss of the faulty power module after the system removes the faulty power module. The present application adopts a method for cross-temperature monitoring of power modules. When a power module fails and is bypassed in the system, the temperature of the faulty power module can be monitored by using adjacent power modules, thereby monitoring the working status of the faulty power module.

[0112] In one embodiment, the temperature monitoring module 210 may include:

[0113] The signal transmission submodule is used to monitor the temperature of the bypass switch using the temperature sensor of the power module, obtain a temperature signal, and transmit the temperature signal to the temperature detection board.

[0114] The signal analysis submodule is used to analyze the temperature signal using the temperature detection board to obtain the temperature of the bypass switch of the power module.

[0115] In one embodiment, the signal analysis submodule may include:

[0116] The signal conversion unit is used to convert the temperature signal into an electrical signal through a signal conditioner, convert the electrical signal into a digital signal using an analog-to-digital converter, and resolve the digital signal into a temperature value using a logic chip.

[0117] In one embodiment, the temperature monitoring module 210 may further include:

[0118] The temperature judgment submodule is used to judge whether the temperature of each bypass switch is greater than a preset threshold value.

[0119] The first determination submodule is used to determine that the operating state of the power module where the bypass switch is located is abnormal when the temperature of the bypass switch is greater than a preset threshold.

[0120] The second determination submodule is used to determine that the operating state of the power module where the bypass switch is located is normal when the temperature of the bypass switch is not greater than a preset threshold.

[0121] In one embodiment, the first control module 230 may include:

[0122] A signal sending submodule is used to send a first control signal to the control board of the faulty power module, so that after the control board generates a drive signal and a switch closing signal according to the first control signal, the drive signal is sent to the transistor drive board of the faulty power module, and the switch closing signal is sent to the switch trigger board of the faulty power module.

[0123] The signal driving submodule is used to use the transistor driving board to drive the half-bridge structure circuit of the faulty power module to perform power conversion according to the driving signal, and transmit the converted power to the energy supply of the faulty power module through the DC support capacitor of the faulty power module, so that the energy supply drives each component in the faulty power module.

[0124] The signal trigger submodule is used to close the bypass switch of the faulty power module according to the switch closing signal by using the switch trigger board.

[0125] In one embodiment, the second control module 240 may include:

[0126] The cross monitoring submodule is used to send a second control signal to the control board of the auxiliary power module so that the control board controls the temperature detection board of the auxiliary power module to analyze the temperature signal transmitted by the temperature sensor of the faulty power module to obtain the temperature of the bypass switch of the faulty power module.

[0127] In one embodiment, the apparatus may further include:

[0128] The first connection module is used for connecting the temperature measuring fiber optic probe with the power module where the temperature measuring fiber optic probe is located and the temperature detection board of the adjacent power module by using the temperature measuring optical fiber when the temperature sensor is a temperature measuring fiber optic probe.

[0129] The second connection module is used to connect each temperature measuring thermistor with the temperature detection board of the power module adjacent to the temperature measuring thermistor by using a high-voltage signal line when the temperature sensor is a temperature measuring thermistor.

[0130] In one embodiment, the present application also provides a storage medium, which stores computer-readable instructions. When the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the online cross-monitoring method of the temperature of the bypass switch of the flexible direct valve power module as described in any of the above embodiments.

[0131] In one embodiment, the present application also provides a computer device, in which computer-readable instructions are stored. When the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the online cross-monitoring method of the temperature of the bypass switch of the flexible direct valve power module as described in any of the above embodiments.

[0132] Indicatively, Figure 8 As shown, Figure 8 This is a schematic diagram of the internal structure of a computer device provided in an embodiment of the present application. The computer device 300 may be provided as a server. Figure 8 The computer device 300 includes a processing component 302, which further includes one or more processors, and a memory resource represented by a memory 301 for storing instructions executable by the processing component 302, such as an application. The application stored in the memory 301 may include one or more modules, each corresponding to a set of instructions. In addition, the processing component 302 is configured to execute instructions to perform the online cross-monitoring method for the temperature of the bypass switch of the flexible direct valve power module of any of the above embodiments.

[0133] The computer device 300 may further include a power supply component 303 configured to perform power management of the computer device 300, a wired or wireless network interface 304 configured to connect the computer device 300 to a network, and an input / output (I / O) interface 305. The computer device 300 may operate based on an operating system stored in the memory 301, such as Windows Server TM, Mac OS X TM, Unix TM, Linux TM, Free BSD TM, or the like.

[0134] Those skilled in the art will understand that Figure 8The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0135] Finally, it should be noted that, in this article, 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 "include", "comprise" 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0136] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

[0137] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. 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 application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for online cross-monitoring of bypass switch temperature of a flexible direct valve power module, characterized in that: The method is applied to a flexible direct current transmission system; the system comprises a plurality of power modules connected in series, each of which is provided with a control board, a bypass switch and a temperature detection board; the method comprises: Monitoring the temperature of the bypass switch of each power module through each temperature detection board, and determining the operating state of each power module based on the temperature of each bypass switch; When the operation state of a power module is abnormal, the abnormal power module is used as a faulty power module, and a power module connected adjacent to the faulty power module is used as an auxiliary power module, and a first control signal and a second control signal are generated; Using the first control signal to drive the control board of the faulty power module to close the bypass switch of the faulty power module, so that the faulty power module is removed from the flexible direct current power transmission system; The second control signal is used to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module.

2. The method for online cross-monitoring of bypass switch temperature of a flexible direct valve power module according to claim 1 is characterized in that: Each power module further includes a temperature sensor, wherein the temperature sensor is disposed on an output row of a bypass switch of the corresponding power module; The method of monitoring the temperature of the bypass switch of each power module by each temperature detection board includes: For each power module: The temperature sensor of the power module is used to monitor the temperature of the bypass switch to obtain a temperature signal, and the temperature signal is transmitted to the temperature detection board; The temperature detection board is used to perform signal analysis on the temperature signal to obtain the temperature of the bypass switch of the power module.

3. The method for online cross-monitoring of bypass switch temperature of a flexible direct valve power module according to claim 2, characterized in that: The temperature detection board includes a signal conditioner, an analog-to-digital converter and a logic chip; The step of performing signal analysis on the temperature signal by using the temperature detection board includes: After the temperature signal is converted into an electrical signal by the signal conditioner, the electrical signal is converted into a digital signal by the analog-to-digital converter, and the digital signal is parsed into a temperature value by the logic chip.

4. The method for online cross-monitoring of bypass switch temperature of a flexible direct valve power module according to claim 2, characterized in that: Using the second control signal to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module includes: Sending the second control signal to the control board of the auxiliary power module, so that the control board controls the temperature detection board of the auxiliary power module to analyze the temperature signal transmitted by the temperature sensor of the faulty power module to obtain the temperature of the bypass switch of the faulty power module; Wherein, the temperature detection board of the auxiliary power module is connected to the temperature sensor of the faulty power module by using a transmission line.

5. The method for online cross-monitoring of bypass switch temperature of a flexible direct valve power module according to claim 1, characterized in that: The step of determining the operating state of each power module based on the temperature of each bypass switch includes: For each bypass switch temperature, determining whether the bypass switch temperature is greater than a preset threshold; If yes, it is determined that the operation state of the power module where the bypass switch is located is abnormal; If not, it is determined that the operating state of the power module where the bypass switch is located is normal.

6. The method for online cross-monitoring of bypass switch temperature of a flexible direct valve power module according to claim 1, characterized in that: Each power module also includes an energy source, a transistor driving board, a switch trigger board, a half-bridge structure circuit and a DC support capacitor; The method of using the first control signal to drive the control board of the faulty power module to close the bypass switch of the faulty power module includes: Sending the first control signal to the control board of the faulty power module, so that after the control board generates a driving signal and a switch closing signal according to the first control signal, the driving signal is sent to the transistor driving board of the faulty power module, and the switch closing signal is sent to the switch trigger board of the faulty power module; The transistor driving board is used to drive the half-bridge structure circuit of the faulty power module to perform power conversion according to the driving signal, and the converted power is transmitted to the energy supply of the faulty power module through the DC support capacitor of the faulty power module, so that the energy supply drives each component in the faulty power module; And, the switch trigger board is used to close the bypass switch of the faulty power module according to the switch closing signal.

7. The method for online cross-monitoring of bypass switch temperature of a flexible direct valve power module according to any one of claims 1 to 6, characterized in that: The method further comprises: Each power module is equipped with a temperature sensor. For each temperature sensor: When the temperature sensor is a temperature measuring optical fiber probe, the temperature measuring optical fiber is used to connect the temperature measuring optical fiber probe to the power module where the temperature measuring optical fiber probe is located and the temperature detection board of the adjacent power module; When the temperature sensor is a temperature measuring thermistor, a high voltage signal line is used to connect the temperature measuring thermistor to a temperature detection board of a power module adjacent to the temperature measuring thermistor.

8. An online cross-monitoring device for the temperature of a bypass switch of a flexible direct valve power module, characterized in that: include: A temperature monitoring module, used to monitor the temperature of the bypass switch of each power module through each temperature detection board, and determine the operating state of each power module based on the temperature of each bypass switch; A signal generating module, configured to, when the operating state of a power module is abnormal, regard the abnormal power module as a faulty power module, regard a power module adjacent to the faulty power module as an auxiliary power module, and generate a first control signal and a second control signal; A first control module, configured to drive the control board of the faulty power module to close the bypass switch of the faulty power module by using the first control signal, so that the faulty power module is removed from the flexible DC power transmission system; The second control module is used to drive the control board of the auxiliary power module to control the temperature detection board of the auxiliary power module to monitor the temperature of the bypass switch of the faulty power module by using the second control signal.

9. A storage medium, characterized in that: The storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the method for online cross-monitoring of the temperature of the bypass switch of the flexible direct valve power module as described in any one of claims 1 to 7.

10. A computer device, characterized in that: include: one or more processors, and memory; The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the method for online cross-monitoring of the temperature of the bypass switch of the flexible direct valve power module as described in any one of claims 1 to 7 are performed.

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