A method, device and medium for monitoring power module operation in a switch cabinet

Abstract

The present invention discloses a method, device and medium for monitoring the operation of a power module in a switch cabinet, relates to the technical field of switch cabinets, and solves the problem that it is impossible to dynamically monitor and analyze different conduction stages of the power module in the switch cabinet. The method includes classifying the plug-ins in the switch cabinet according to the circuit connection method, measuring electrical variables and analyzing the conduction state of the bidirectional thyristor during soft starting of the power module based on the electrical variables, analyzing the operating state of the power module in different conduction stages when the power module is soft started, monitoring the operating state of the bidirectional thyristor in the power module in a test environment, and monitoring the operating state of the power module based on the changing trend of the on-state voltage and temperature of the power module during operation. The present invention realizes dynamic monitoring and analysis of different conduction stages of the power module in the switch cabinet.

Description

Technical Field

[0001] The present invention belongs to the technical field of switch cabinets, and in particular relates to a method, a device and a medium for monitoring the operation of a power module in a switch cabinet. Background Art

[0002] Switchgear is a kind of electrical equipment. Its main function is to open and close, control and protect electrical equipment in the process of power generation, transmission, distribution and power conversion in the power system. There are many ways to classify switchgear. For example, according to the different cabinet structures, it can be divided into open switchgear, metal-enclosed switchgear and metal-enclosed armored switchgear; according to the different voltage levels, it can be divided into high-voltage switchgear, medium-voltage switchgear and low-voltage switchgear.

[0003] Existing monitoring technologies primarily focus on the current and voltage of power modules within switchgear. However, the conduction state of the triac during soft-start is affected by multiple factors, including gate current / voltage, trigger delay, and current waveform. Existing technologies also lack dynamic analysis of the triac's conduction phase (e.g., number of conduction cycles, trigger delay error, and output current peak). Traditional monitoring techniques fail to analyze the reliability of power modules within switchgear by integrating the coupled relationship between the triac's on-state voltage and temperature.

[0004] To this end, the present invention provides a method, device and medium for monitoring the operation of a power module in a switch cabinet. Summary of the Invention

[0005] The purpose of the present invention is to propose a method, device and medium for monitoring the operation of power modules in a switch cabinet to solve the problem in the above background technology that it is impossible to dynamically monitor and analyze different conduction stages of the power modules in the switch cabinet.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] In a first aspect, a method for monitoring the operation of a power module in a switch cabinet comprises the following steps:

[0008] Step S1, classifying the plug-ins in the switch cabinet according to the circuit connection method;

[0009] Step S2, measuring the electrical variables and analyzing the conduction state of the bidirectional thyristor during the soft start of the power module according to the electrical variables;

[0010] Step S3: When the power module is soft-started, the operating status of the power module in different conduction stages is analyzed;

[0011] Step S4, monitoring the operating status of the bidirectional thyristor in the power module under the test environment;

[0012] Step S5 , monitoring the operating state of the power module according to the changing trends of the on-state voltage and temperature of the power module during operation.

[0013] Furthermore, the classification process in step S1 includes the following sub-steps:

[0014] Step S11: Obtain the circuit connection mode between different plug-ins in the switch cabinet. If the input end of the plug-in is directly connected to the power bus, and the output end of the plug-in is directly connected to the power load, then the corresponding plug-in is recorded as an integrated plug-in.

[0015] If the input end of the plug-in is not directly connected to the power bus or the output end of the plug-in is not directly connected to the power load, the corresponding plug-in is recorded as a split plug-in;

[0016] Step S12, further subdividing the split plug-in in the switch cabinet, specifically:

[0017] If the output terminal of the split plug-in is not directly connected to the power load, the corresponding split plug-in is recorded as a driver module;

[0018] If the output end of the split plug-in is directly connected to the load, the corresponding split plug-in is recorded as a power module.

[0019] Furthermore, the monitoring and analysis process of step S2 includes the following sub-steps:

[0020] Step S21, using the output current of the driver plug-in as the gate current of the bidirectional thyristor, and using the output voltage of the driver plug-in as the gate voltage of the bidirectional thyristor;

[0021] Step S22, comparing the gate current of the bidirectional thyristor with the gate trigger current, and comparing the gate trigger voltage of the bidirectional thyristor;

[0022] When the gate current of the bidirectional thyristor is less than the gate trigger current or the gate voltage is less than the gate trigger voltage, check the driver plug-in;

[0023] When the gate current of the bidirectional thyristor is greater than or equal to the gate trigger current, and the gate voltage is greater than or equal to the gate trigger voltage, the process proceeds to the next step.

[0024] Furthermore, the monitoring and analysis process of step S2 further includes the following sub-steps:

[0025] Step S23, obtaining the on time, off time and re-on time of the bidirectional thyristor;

[0026] Step S24, subtracting the on-time from the off-time to obtain the on-time of the bidirectional thyristor, and recording the process from on-time to off-time and then to re-on-time of the bidirectional thyristor as the on-time phase of the bidirectional thyristor;

[0027] Step S25, subtracting the on-time from the reset time and dividing the result by the half-wave period of the input current to obtain the number of on-stages of the bidirectional thyristor, and dividing the on-stages of the bidirectional thyristor into different on-stages according to the ascending order of the on-time;

[0028] Step S26, collecting the input current frequency of the bidirectional thyristor, collecting the input current zero-crossing moments in different conduction stages, taking the inverse of the input current frequency to obtain the input current period of the bidirectional thyristor, and dividing the input current period by two to obtain the input current half-wave period of the bidirectional thyristor.

[0029] Furthermore, the analysis process of step S3 includes the following sub-steps:

[0030] Step S31: record the number of half-wave cycles of the input current in a single conduction phase as the conduction period number, and record the conduction period number of different conduction phases as T i , where i is the number of different conduction stages, i=1, 2, ..., n, and n is a positive integer;

[0031] Step S32, collecting the input current zero-crossing time of the current conduction phase, multiplying the number of conduction cycles of the current conduction phase by the input current half-wave period to obtain the theoretical conduction duration of the current conduction phase, and subtracting the input current zero-crossing time from the conduction time of the bidirectional thyristor in the current conduction phase to obtain the trigger delay of the current conduction phase;

[0032] Step S33, traversing and comparing the output currents in a single conduction phase to obtain a maximum value of the output current, and taking the maximum value of the output current as the output current peak value of the corresponding conduction phase;

[0033] Step S34 , analyzing the current conduction phase of the bidirectional thyristor to determine whether the soft start process of the power module is in a normal state.

[0034] Furthermore, the analysis process of step S34 includes the following sub-steps:

[0035] Step S341: Divide the on-time by the theoretical on-time to obtain an on-time error rate of the current on-time phase, compare the on-time error rate of the current on-time phase with an error rate threshold, and compare the trigger delay of the current on-time phase with a trigger delay threshold;

[0036] If the conduction duration error rate of the current conduction phase is greater than or equal to the error rate threshold or the trigger delay is greater than or equal to the trigger delay threshold, the conduction is stopped;

[0037] If the conduction duration error rate of the current conduction phase is less than the error rate threshold and the trigger delay is less than the trigger delay threshold, proceed to the next step;

[0038] Step S342, comparing the output current peak value in the current conduction phase with the output current threshold;

[0039] If the output current peak value of the current conduction phase is greater than or equal to the output current threshold, the conduction cycle number of the current conduction phase is obtained, and the conduction cycle number of the next conduction phase is kept unchanged at the conduction cycle number of the current conduction phase;

[0040] If the output current peak value in the current conduction phase is less than the output current threshold, proceed to the next step;

[0041] Step S343, by the formula DZ=T i -T i-1 Calculate the conduction period increment number DZ of adjacent conduction phases. If the conduction period increment number DZ of any adjacent conduction phase is not equal to one, check the driver plug-in.

[0042] If the incremented numbers of conduction periods in all adjacent conduction phases are equal to one, proceed to the next step.

[0043] Furthermore, the monitoring process of step S4 includes the following sub-steps:

[0044] Step S41, setting the ambient temperature of the bidirectional thyristor to a fixed test temperature, and applying a half-sine wave alternating current to the bidirectional thyristor;

[0045] Step S42, obtaining standard parameters of the bidirectional thyristor;

[0046] Step S43, analyzing the on-state current state of the bidirectional thyristor according to the real-time current and voltage data and standard parameters;

[0047] The real-time current and voltage data are the real-time on-state current and real-time on-state peak voltage of the bidirectional thyristor;

[0048] The analysis process in step S43 includes the following sub-steps:

[0049] Step S431, collecting the real-time on-state current of the bidirectional thyristor at different time nodes at a fixed time interval, adding and averaging the real-time on-state current of the power module at different time nodes to obtain the real-time on-state average current;

[0050] Step S432, comparing the real-time average on-state current of the bidirectional thyristor with the maximum value of the average on-state current in the standard parameters;

[0051] If the real-time on-state average current is greater than or equal to the maximum value of the on-state average current in the standard parameters, the power supply is stopped;

[0052] If the real-time on-state average current is less than the maximum value of the on-state average current in the standard parameters, proceed to the next step;

[0053] Step S433: applying an instantaneous peak current to the bidirectional thyristor, collecting the on-state voltage of the bidirectional thyristor in real time, traversing and comparing the on-state voltages at different time nodes to obtain the maximum value of the on-state voltage, and recording the maximum value of the on-state voltage as the real-time on-state peak voltage;

[0054] Step S434, comparing the real-time on-state peak voltage of the bidirectional thyristor with the on-state peak voltage in the standard parameters;

[0055] If the real-time on-state peak voltage is greater than or equal to the on-state peak voltage in the standard parameters, check the bidirectional thyristor;

[0056] If the real-time on-state peak voltage is less than the on-state peak voltage in the standard parameters, proceed to the next step.

[0057] Furthermore, the monitoring process in step S5 includes the following sub-steps:

[0058] Step S51: collecting the real-time temperature of the power module at different time nodes, subtracting the real-time temperature of the power module at the previous time node from the real-time temperature of the current time node to obtain the real-time temperature change, and subtracting the on-state voltage of the previous time node from the on-state voltage of the current time node to obtain the on-state voltage change value of the current time node;

[0059] Step S52, dividing the on-state voltage change value by the real-time temperature change value to obtain the voltage temperature coefficient of the power module, subtracting the standard coefficient from the voltage temperature coefficient and dividing the result by the standard coefficient to obtain the coefficient deviation rate;

[0060] Step S53, comparing the coefficient deviation rate of the power module with the deviation rate threshold;

[0061] If the coefficient deviation rate of the power module is greater than or equal to the deviation rate threshold, an early warning is issued;

[0062] If the coefficient deviation rate of the power module is less than the deviation rate threshold, continuous monitoring is performed.

[0063] In a second aspect, an electronic device is further provided, characterized in that the electronic device includes:

[0064] a memory storing a computer program;

[0065] A processor is communicatively connected to the memory, and when the computer program is executed by the processor, the method for monitoring the operation of the power module in the switch cabinet is implemented.

[0066] In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that when the program is executed by a processor, the method for monitoring the operation of a power module in a switch cabinet is implemented.

[0067] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0068] 1. The present invention first classifies the plug-ins in the switch cabinet according to the circuit connection method, then measures the electrical variables and analyzes the conduction state of the bidirectional thyristor during the soft start of the power module based on the electrical variables. When the power module is soft-started, the operating state of the power module in different conduction stages is analyzed. The present invention realizes the analysis of the different conduction stages of the power modules in the switch cabinet;

[0069] 2. The present invention also monitors the operating status of the bidirectional thyristor in the power module in the switch cabinet under the test environment, and monitors the operating status of the power module according to the changing trend of the on-state voltage and temperature when the power module is running. The present invention also realizes the monitoring of the operating status of the power module in the switch cabinet when it is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0071] Figure 1 is a flow chart of the method of the present invention;

[0072] Figure 2 A schematic diagram of the internal plug-in unit of the switch cabinet of the present invention;

[0073] Figure 3 Schematic diagram of the input current half-wave period in the present invention;

[0074] Figure 4 It is a structural schematic diagram of the electronic device in the present invention. DETAILED DESCRIPTION

[0075] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0076] Example 1: Please refer to Figure 1-Figure 3 As shown, the technical solution provided by the present invention is: a method for monitoring the operation of a power module in a switch cabinet, the method is specifically as follows:

[0077] Step S1, classifying the plug-ins in the switch cabinet according to the circuit connection method;

[0078] In this embodiment, the classification process in step S1 includes the following sub-steps:

[0079] Step S11, please refer to Figure 1 As shown, the circuit connection mode between different plug-ins in the switch cabinet is obtained. If the input end of the plug-in is directly connected to the power bus, and the output end of the plug-in is directly connected to the power load, the corresponding plug-in is recorded as an integrated plug-in;

[0080] If the input end of the plug-in is not directly connected to the power bus or the output end of the plug-in is not directly connected to the power load, the corresponding plug-in is recorded as a split plug-in;

[0081] Step S12, further subdividing the split plug-in in the switch cabinet, specifically:

[0082] If the output terminal of the split plug-in is not directly connected to the power load, the corresponding split plug-in is recorded as a driver module;

[0083] If the output end of the split plug-in is directly connected to the load, the corresponding split plug-in is recorded as a power module;

[0084] It should be explained that the integrated plug-in is a plug-in in which the power module and the drive module are integrated on the same plug-in, while the drive module and the power module in the split plug-in are both independent plug-ins.

[0085] Step S2, measuring the electrical variables and analyzing the conduction state of the bidirectional thyristor during the soft start of the power module according to the electrical variables;

[0086] Among them, the bidirectional thyristor is a semiconductor component used to control current conduction inside the power module. The electrical variables include the output current and output voltage of the driver plug-in;

[0087] In this embodiment, the monitoring and analysis process of step S2 includes the following sub-steps:

[0088] Step S21, using the output current of the driver plug-in as the gate current of the bidirectional thyristor, and using the output voltage of the driver plug-in as the gate voltage of the bidirectional thyristor;

[0089] Step S22, comparing the gate current of the bidirectional thyristor with the gate trigger current, and comparing the gate trigger voltage of the bidirectional thyristor;

[0090] When the gate current of the bidirectional thyristor is less than the gate trigger current or the gate voltage is less than the gate trigger voltage, it indicates that the output current or output voltage of the driver plug-in is abnormal, and the driver plug-in should be checked;

[0091] When the gate current of the bidirectional thyristor is greater than or equal to the gate trigger current, and the gate voltage is greater than or equal to the gate trigger voltage, it means that the bidirectional thyristor is in the on state, and then proceed to the next step;

[0092] Step S23, obtaining the on time, off time and re-on time of the bidirectional thyristor;

[0093] Step S24, subtracting the on-time from the off-time to obtain the on-time of the bidirectional thyristor, and recording the process from on-time to off-time and then to re-on-time of the bidirectional thyristor as the on-time phase of the bidirectional thyristor;

[0094] Step S25, subtracting the on-time from the reset time and dividing the result by the half-wave period of the input current to obtain the number of on-stages of the bidirectional thyristor, and dividing the on-stages of the bidirectional thyristor into different on-stages according to the ascending order of the on-time;

[0095] For example, if the conduction times of the conduction phases are 10:30, 10:31, and 10:33 respectively, the conduction phase with a conduction time of 10:30 is recorded as the first conduction phase, the conduction phase with a conduction time of 10:31 is recorded as the second conduction phase, and the conduction phase with a conduction time of 10:33 is recorded as the third conduction phase;

[0096] Step S26, see Figure 3 As shown, the input current frequency of the bidirectional thyristor is collected, the input current zero-crossing moment of the input current in different conduction stages is collected, the inverse of the input current frequency is taken to obtain the input current cycle of the bidirectional thyristor, and the input current cycle is divided by two to obtain the input current half-wave period of the bidirectional thyristor.

[0097] Step S3: When the power module is soft-started, the operating status of the power module in different conduction stages is analyzed;

[0098] In this embodiment, the analysis process of step S3 includes the following sub-steps:

[0099] Step S31: record the number of half-wave cycles of the input current in a single conduction phase as the conduction period number, and record the conduction period number of different conduction phases as T i , where i is the number of different conduction stages, i=1, 2, ..., n, and n is a positive integer;

[0100] It should be explained that the number of conduction cycles in the first conduction phase defaults to 1;

[0101] Step S32, collecting the input current zero-crossing time of the current conduction phase, multiplying the number of conduction cycles of the current conduction phase by the input current half-wave period to obtain the theoretical conduction duration of the current conduction phase, and subtracting the input current zero-crossing time from the conduction time of the bidirectional thyristor in the current conduction phase to obtain the trigger delay of the current conduction phase;

[0102] It should be explained that, in this embodiment, the input current zero-crossing moment is the moment when the voltage of the input current crosses zero from negative to positive;

[0103] Step S33, traversing and comparing the output currents in a single conduction phase to obtain a maximum value of the output current, and taking the maximum value of the output current as the output current peak value of the corresponding conduction phase;

[0104] Step S34, analyzing the current conduction phase of the bidirectional thyristor to determine whether the soft start process of the power module is in a normal state;

[0105] Furthermore, the analysis process of step S34 includes the following sub-steps:

[0106] Step S341: Divide the on-time by the theoretical on-time to obtain an on-time error rate of the current on-time phase, compare the on-time error rate of the current on-time phase with an error rate threshold, and compare the trigger delay of the current on-time phase with a trigger delay threshold;

[0107] If the conduction duration error rate of the current conduction phase is greater than or equal to the error rate threshold or the trigger delay is greater than or equal to the trigger delay threshold, the conduction is stopped;

[0108] If the conduction duration error rate of the current conduction phase is less than the error rate threshold and the trigger delay is less than the trigger delay threshold, proceed to the next step;

[0109] Step S342, comparing the output current peak value in the current conduction phase with the output current threshold;

[0110] If the output current peak value in the current conduction phase is greater than or equal to the output current threshold, it indicates that the soft start process of the power module is in an abnormal state, then the number of conduction cycles in the current conduction phase is obtained, and the number of conduction cycles in the next conduction phase is kept unchanged from the number of conduction cycles in the current conduction phase;

[0111] If the output current peak value in the current conduction phase is less than the output current threshold, it means that the output current of the power module is in a normal state, and then proceed to the next step;

[0112] In this embodiment, the output current threshold is set to 2.5 times the rated current of the power module;

[0113] Step S343, by the formula DZ=T i-T i-1 Calculate the conduction period increment number DZ of adjacent conduction phases. If the conduction period increment number DZ of any adjacent conduction phase is not equal to one, check the driver plug-in.

[0114] If the incremented numbers of conduction periods in all adjacent conduction phases are equal to one, proceed to the next step.

[0115] Step S4, monitoring the operating status of the bidirectional thyristor in the power module under the test environment;

[0116] In this embodiment, the monitoring process of step S4 includes the following sub-steps:

[0117] Step S41, setting the ambient temperature of the triac to a fixed test temperature, and applying a half-sine wave alternating current to the triac. In this embodiment, the fixed test temperature is 85 degrees Celsius, and the half-sine wave alternating current is applied: during the test, the current waveform flowing through the triac is half a cycle of a sine wave, and the waveform shape is half of a standard sine curve.

[0118] Step S42, obtain the standard parameters of the bidirectional thyristor, as shown in the following table:

[0119] In this embodiment, the power module is a 380V-20kW power module;

[0120] Step S43, analyzing the on-state current state of the bidirectional thyristor according to the real-time current and voltage data and standard parameters;

[0121] The real-time current and voltage data are the real-time on-state current and real-time on-state peak voltage of the bidirectional thyristor;

[0122] Furthermore, the analysis process in step S43 includes the following sub-steps:

[0123] Step S431: collecting the real-time on-state current of the bidirectional thyristor at different time nodes at fixed time intervals, adding and averaging the real-time on-state current of the power module at different time nodes to obtain the real-time on-state average current; wherein the real-time on-state current refers to the current value flowing through the power module when the power module is in the on state;

[0124] Step S432, comparing the real-time average on-state current of the bidirectional thyristor with the maximum value of the average on-state current in the standard parameters;

[0125] If the real-time on-state average current is greater than or equal to the maximum value of the on-state average current in the standard parameters, it means that the on-state average current of the bidirectional thyristor is abnormal, and the power supply is stopped;

[0126] If the real-time on-state average current is less than the maximum value of the on-state average current in the standard parameters, proceed to the next step;

[0127] Step S433: Apply an instantaneous peak current to the bidirectional thyristor, collect the on-state voltage of the bidirectional thyristor in real time, traverse and compare the on-state voltages at different time nodes to obtain the maximum on-state voltage, and record the maximum on-state voltage as the real-time on-state peak voltage; in this embodiment, the instantaneous peak current is 170A;

[0128] Step S434, comparing the real-time on-state peak voltage of the bidirectional thyristor with the on-state peak voltage in the standard parameters;

[0129] If the real-time on-state peak voltage is greater than or equal to the on-state peak voltage in the standard parameters, it means that the bidirectional thyristor is abnormal, and the bidirectional thyristor should be checked;

[0130] If the real-time on-state peak voltage is less than the on-state peak voltage in the standard parameters, proceed to the next step.

[0131] Step S5, monitoring the operating state of the power module according to the changing trends of the on-state voltage and temperature of the power module during operation;

[0132] Specifically, the monitoring process in step S5 includes the following sub-steps:

[0133] Step S51: collecting the real-time temperature of the power module at different time nodes, subtracting the real-time temperature of the power module at the previous time node from the real-time temperature of the current time node to obtain the real-time temperature change, and subtracting the on-state voltage of the previous time node from the on-state voltage of the current time node to obtain the on-state voltage change value of the current time node;

[0134] Step S52, dividing the on-state voltage change value by the real-time temperature change value to obtain the voltage temperature coefficient of the power module, subtracting the standard coefficient from the voltage temperature coefficient and dividing the result by the standard coefficient to obtain the coefficient deviation rate;

[0135] It should be explained that the standard coefficients can be obtained from the user manual of the corresponding module;

[0136] Step S53, comparing the coefficient deviation rate of the power module with the deviation rate threshold;

[0137] If the coefficient deviation rate of the power module is greater than or equal to the deviation rate threshold, an early warning is issued;

[0138] If the coefficient deviation rate of the power module is less than the deviation rate threshold, continuous monitoring is performed.

[0139] In this application, if a corresponding calculation formula appears, the above calculation formula is dimensionless and its numerical calculation is performed. The weight coefficient, proportional coefficient and other coefficients in the formula are set to a result value obtained by quantifying each parameter. Regarding the size of the weight coefficient and the proportional coefficient, as long as it does not affect the proportional relationship between the parameter and the result value, it is acceptable.

[0140] Example 2: Figure 4 This is a schematic diagram of the structure of an electronic device, which may include: a processor, a communications interface, a memory, and a communications bus, wherein the processor, the communications interface, and the memory communicate with each other via the communications bus. The processor can call logic instructions in the memory to execute a method for monitoring the operation of a power module in a switch cabinet, the method comprising: classifying plug-ins in the switch cabinet according to circuit connection methods; measuring electrical variables and analyzing the conduction state of a bidirectional thyristor during soft-start of the power module based on the electrical variables; analyzing the operating state of the power module at different conduction stages during soft-start; monitoring the operating state of the bidirectional thyristor in the power module under a test environment; and monitoring the operating state of the power module based on the changing trends of the on-state voltage and temperature of the power module during operation.

[0141] In addition, the logical instructions in the above-mentioned memory can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application, or the part that contributes to the existing technology, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program code.

[0142] On the other hand, the present application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute a method for monitoring the operation of a power module in a switch cabinet provided by the above methods, the method including: classifying the plug-ins in the switch cabinet according to the circuit connection method; measuring electrical variables and analyzing the conduction state of the bidirectional thyristor during soft start of the power module based on the electrical variables; when the power module is soft started, analyzing the operating state of the power module in different conduction stages; monitoring the operating state of the bidirectional thyristor in the power module under a test environment; monitoring the operating state of the power module based on the changing trend of the on-state voltage and temperature when the power module is running.

[0143] On the other hand, the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute a method for monitoring the operation of a power module in a switch cabinet provided above, the method comprising: classifying the plug-ins in the switch cabinet according to the circuit connection method; measuring electrical variables and analyzing the conduction state of the bidirectional thyristor during soft start of the power module based on the electrical variables; analyzing the operating state of the power module in different conduction stages when the power module is soft started; monitoring the operating state of the bidirectional thyristor in the power module under a test environment; monitoring the operating state of the power module based on the changing trend of the on-state voltage and temperature when the power module is operating.

[0144] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0145] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for monitoring the operation of a power module in a switch cabinet, characterized in that: The method comprises the following steps: Step S1, classifying the plug-ins in the switch cabinet according to the circuit connection method; Step S2, measuring the electrical variables and analyzing the conduction state of the bidirectional thyristor during the soft start of the power module according to the electrical variables; Step S3: When the power module is soft-started, the operating status of the power module in different conduction stages is analyzed; The analysis process of step S3 includes the following sub-steps: Step S31: record the number of half-wave cycles of the input current in a single conduction phase as the conduction period number, and record the conduction period number of different conduction phases as T i , where i is the number of different conduction stages, i=1, 2, ..., n, and n is a positive integer; Step S32, collecting the input current zero-crossing time of the current conduction phase, multiplying the number of conduction cycles of the current conduction phase by the input current half-wave period to obtain the theoretical conduction duration of the current conduction phase, and subtracting the input current zero-crossing time from the conduction time of the bidirectional thyristor in the current conduction phase to obtain the trigger delay of the current conduction phase; Step S33, traversing and comparing the output currents in a single conduction phase to obtain a maximum value of the output current, and taking the maximum value of the output current as the output current peak value of the corresponding conduction phase; Step S34, analyzing the current conduction phase of the bidirectional thyristor to determine whether the soft start process of the power module is in a normal state; The analysis process of step S34 includes the following sub-steps: Step S341: Divide the on-time by the theoretical on-time to obtain an on-time error rate of the current on-time phase, compare the on-time error rate of the current on-time phase with an error rate threshold, and compare the trigger delay of the current on-time phase with a trigger delay threshold; If the conduction duration error rate of the current conduction phase is greater than or equal to the error rate threshold or the trigger delay is greater than or equal to the trigger delay threshold, the conduction is stopped; If the conduction duration error rate of the current conduction phase is less than the error rate threshold and the trigger delay is less than the trigger delay threshold, proceed to the next step; Step S342, comparing the output current peak value in the current conduction phase with the output current threshold; If the output current peak value of the current conduction phase is greater than or equal to the output current threshold, the conduction cycle number of the current conduction phase is obtained, and the conduction cycle number of the next conduction phase is kept unchanged at the conduction cycle number of the current conduction phase; If the output current peak value in the current conduction phase is less than the output current threshold, proceed to the next step; Step S343, by the formula DZ=T i -T i-1 Calculate the conduction period increment number DZ of adjacent conduction phases. If the conduction period increment number DZ of any adjacent conduction phase is not equal to one, check the drive module. If the incremented number of conduction cycles in all adjacent conduction phases is equal to one, proceed to the next step; Step S4, monitoring the operating status of the bidirectional thyristor in the power module under the test environment; Step S5 , monitoring the operating state of the power module according to the changing trends of the on-state voltage and temperature of the power module during operation.

2. A method for monitoring the operation of a power module in a switch cabinet according to claim 1, characterized in that: The classification process in step S1 includes the following sub-steps: Step S11: Obtain the circuit connection mode between different plug-ins in the switch cabinet. If the input end of the plug-in is directly connected to the power bus, and the output end of the plug-in is directly connected to the power load, then the corresponding plug-in is recorded as an integrated plug-in. If the input end of the plug-in is not directly connected to the power bus or the output end of the plug-in is not directly connected to the power load, the corresponding plug-in is recorded as a split plug-in; Step S12, further subdividing the split plug-in in the switch cabinet, specifically: If the output end of the split plug-in is not directly connected to the power load, the corresponding split plug-in is recorded as a driver module; If the output end of the split plug-in is directly connected to the load, the corresponding split plug-in is recorded as a power module.

3. The method for monitoring the operation of a power module in a switch cabinet according to claim 2, characterized in that: The monitoring and analysis process of step S2 includes the following sub-steps: Step S21, using the output current of the driving module as the gate current of the bidirectional thyristor, and using the output voltage of the driving module as the gate voltage of the bidirectional thyristor; Step S22, comparing the gate current of the bidirectional thyristor with the gate trigger current, and comparing the gate voltage of the bidirectional thyristor with the gate trigger voltage; When the gate current of the bidirectional thyristor is less than the gate trigger current or the gate voltage is less than the gate trigger voltage, the driver module is checked; When the gate current of the bidirectional thyristor is greater than or equal to the gate trigger current, and the gate voltage is greater than or equal to the gate trigger voltage, the process proceeds to the next step.

4. The method for monitoring the operation of a power module in a switch cabinet according to claim 3, characterized in that: The monitoring and analysis process of step S2 further includes the following sub-steps: Step S23, obtaining the on time, off time and re-on time of the bidirectional thyristor; Step S24, subtracting the on-time from the off-time to obtain the on-time of the bidirectional thyristor, and recording the process from on-time to off-time and then to re-on-time of the bidirectional thyristor as the on-time phase of the bidirectional thyristor; Step S25, subtracting the on-time from the reset time and dividing the result by the half-wave period of the input current to obtain the number of on-stages of the bidirectional thyristor, and dividing the on-stages of the bidirectional thyristor into different on-stages according to the ascending order of the on-time; Step S26, collecting the input current frequency of the bidirectional thyristor, collecting the input current zero-crossing moments in different conduction stages, taking the inverse of the input current frequency to obtain the input current period of the bidirectional thyristor, and dividing the input current period by two to obtain the input current half-wave period of the bidirectional thyristor.

5. The method for monitoring the operation of a power module in a switch cabinet according to claim 1, characterized in that: The monitoring process of step S4 includes the following sub-steps: Step S41, setting the ambient temperature of the bidirectional thyristor to a fixed test temperature, and applying a half-sine wave alternating current to the bidirectional thyristor; Step S42, obtaining standard parameters of the bidirectional thyristor; Step S43, analyzing the on-state current state of the bidirectional thyristor according to the real-time current and voltage data and standard parameters; The real-time current and voltage data are the real-time on-state current and real-time on-state peak voltage of the bidirectional thyristor; The analysis process in step S43 includes the following sub-steps: Step S431, collecting the real-time on-state current of the bidirectional thyristor at different time nodes at a fixed time interval, adding and averaging the real-time on-state current of the power module at different time nodes to obtain the real-time on-state average current; Step S432, comparing the real-time average on-state current of the bidirectional thyristor with the maximum value of the average on-state current in the standard parameters; If the real-time on-state average current is greater than or equal to the maximum value of the on-state average current in the standard parameters, the power supply is stopped; If the real-time on-state average current is less than the maximum value of the on-state average current in the standard parameters, proceed to the next step; Step S433: applying an instantaneous peak current to the bidirectional thyristor, collecting the on-state voltage of the bidirectional thyristor in real time, traversing and comparing the on-state voltages at different time nodes to obtain the maximum value of the on-state voltage, and recording the maximum value of the on-state voltage as the real-time on-state peak voltage; Step S434, comparing the real-time on-state peak voltage of the bidirectional thyristor with the on-state peak voltage in the standard parameters; If the real-time on-state peak voltage is greater than or equal to the on-state peak voltage in the standard parameters, check the bidirectional thyristor; If the real-time on-state peak voltage is less than the on-state peak voltage in the standard parameters, proceed to the next step.

6. The method for monitoring the operation of a power module in a switch cabinet according to claim 5, characterized in that: The monitoring process in step S5 includes the following sub-steps: Step S51: collecting the real-time temperature of the power module at different time nodes, subtracting the real-time temperature of the power module at the previous time node from the real-time temperature of the current time node to obtain the real-time temperature change, and subtracting the on-state voltage of the previous time node from the on-state voltage of the current time node to obtain the on-state voltage change value of the current time node; Step S52, dividing the on-state voltage change value by the real-time temperature change value to obtain the voltage temperature coefficient of the power module, subtracting the standard coefficient from the voltage temperature coefficient and dividing the result by the standard coefficient to obtain the coefficient deviation rate; Step S53, comparing the coefficient deviation rate of the power module with the deviation rate threshold; If the coefficient deviation rate of the power module is greater than or equal to the deviation rate threshold, an early warning is issued; If the coefficient deviation rate of the power module is less than the deviation rate threshold, continuous monitoring is performed.

7. An electronic device, characterized in that: The electronic device comprises: a memory storing a computer program; A processor is communicatively connected to the memory, and when the computer program is executed by the processor, the method according to any one of claims 1 to 6 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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