Method and device for monitoring operation of power module in switch cabinet and medium

Abstract

The invention discloses a method and equipment for monitoring operation of a power module in a switch cabinet and a medium, relates to the technical field of switch cabinets, and solves the problem that different conduction stages of the power module in the switch cabinet cannot be dynamically monitored and analyzed. Measuring the electrical variable and analyzing the conduction state of the bidirectional silicon controlled rectifier during soft start of the power module according to the electrical variable, when the power module is subjected to soft start, analyzing the operation states of the power module in different conduction stages, and monitoring the operation state of the bidirectional silicon controlled rectifier in the power module in a test environment; and the operation state of the power module is monitored according to the change trend of the on-state voltage and temperature during operation of the power module. According to the invention, dynamic monitoring and analysis of different conduction stages of the power module in the switch cabinet are realized.

Description

Technical Field

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

[0002] A switch cabinet is an electrical device. The main function of a switch cabinet is to open, close, control, and protect electrical equipment during the processes of power generation, transmission, distribution, and power conversion in a power system. There are many classification methods for switch cabinets. For example, according to the different cabinet structures, they can be divided into open switch cabinets, metal-enclosed switch cabinets, and metal-enclosed armored switch cabinets; according to different voltage levels, they can be divided into high-voltage switch cabinets, medium-voltage switch cabinets, and low-voltage switch cabinets, etc. In existing monitoring technologies, more attention is paid to the current and voltage of power modules in the switch cabinet. However, the conduction state of the thyristor during the soft start of the power module in the switch cabinet is affected by multiple factors such as gate current / voltage, trigger delay, and current waveform. At the same time, existing technologies also lack dynamic analysis of the conduction stage of the thyristor (such as the number of conduction cycles, trigger delay error, output current peak value). Traditional monitoring does not analyze the reliability of the power module in the switch cabinet by combining the coupling relationship between the on-state voltage and temperature of the thyristor. Therefore, the present invention proposes a method, device, and medium for monitoring the operation of power modules in a switch cabinet. Summary of the Invention

[0003] 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 of being unable to dynamically monitor and analyze different conduction stages of power modules in the switch cabinet as mentioned in the above background technique.

[0004] The purpose of the present invention can be achieved through the following technical solutions: In the first aspect, a method for monitoring the operation of a power module in a switch cabinet, the method includes the following steps: Step S1, classify the plug-ins in the switch cabinet according to the circuit connection method; Step S2, measure electrical variables and analyze the conduction state of the thyristor during the soft start of the power module based on the electrical variables; Step S3, when the power module performs a soft start, analyze the operating states of the power modules in different conduction stages; Step S4, monitor the operating state of the thyristor in the power module under the test environment; Step S5, monitor the operating state of the power module based on the change trends of the on-state voltage and temperature during the operation of the power module.

[0005] Further, the classification process in the step S1 includes the following sub-steps: Step S11, obtain the circuit connection mode between different plug-ins in the switchgear 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 electrical load, then mark the corresponding plug-in 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 electrical load, then mark the corresponding plug-in as a split plug-in; Step S12, further subdivide the split plug-ins in the switchgear cabinet, specifically: If the output end of the split plug-in is not directly connected to the electrical load, then mark the corresponding split plug-in as a drive module; If the output end of the split plug-in is directly connected to the load, then mark the corresponding split plug-in as a power module.

[0006] Furthermore, the monitoring and analysis process of step S2 includes the following sub-steps: Step S21, use the output current of the drive plug-in as the gate current of the triac and the output voltage of the drive plug-in as the gate voltage of the triac; Step S22, compare the gate current of the triac with the gate trigger current and compare the gate trigger voltage of the triac; When there is any one of the gate current of the triac being less than the gate trigger current or the gate voltage being less than the gate trigger voltage, then check the drive plug-in; When the gate current of the triac is greater than or equal to the gate trigger current and the gate voltage is greater than or equal to the gate trigger voltage, then proceed to the next step.

[0007] Furthermore, the monitoring and analysis process of step S2 also includes the following sub-steps: Step S23, obtain the conduction time, cut-off time and re-conduction time of the triac; Step S24, subtract the conduction time from the cut-off time to obtain the conduction duration of the triac, and record the process of the triac from conduction to cut-off and then to re-conduction as the conduction stage of the triac; Step S25, divide the difference between the re-conduction time and the conduction time by the half-wave period of the input current to obtain the number of conduction stages of the triac, and divide the conduction stages of the triac into different conduction stages according to the ascending order of the conduction time; Step S26, collect the input current frequency of the triac, collect the zero-crossing moments of the input current in different conduction stages, take the reciprocal of the input current frequency to obtain the input current period of the triac, and divide the input current period by two to obtain the half-wave period of the input current of the triac.

[0008] Furthermore, the analysis process of step S3 includes the following sub-steps: Step S31: Denote the number of input current half - wave cycles passed within a single conduction stage as the conduction cycle number, and denote the conduction cycle numbers of different conduction stages as \(T_i\), where \(i\) is the number of different conduction stages, \(i = 1, 2,\cdots, n\), and \(n\) is a positive integer; i where \(i\) is the number of different conduction stages, \(i = 1, 2,\cdots, n\), and \(n\) is a positive integer; Step S32: Collect the zero - crossing moment of the input current in the current conduction stage. Multiply the conduction cycle number of the current conduction stage by the input current half - wave period to obtain the theoretical conduction duration of the current conduction stage. Subtract the zero - crossing moment of the input current from the conduction time of the triac in the current conduction stage to obtain the trigger delay of the current conduction stage; Step S33: Traverse and compare the output currents within a single conduction stage to obtain the maximum value of the output current, and take the maximum value of the output current as the output current peak value corresponding to the conduction stage; Step S34: Analyze the current conduction stage of the triac to determine whether the soft - start process of the power module is in a normal state.

[0009] Furthermore, the analysis process of step S34 includes the following sub - steps: Step S341: Divide the conduction duration by the theoretical conduction duration to obtain the conduction duration error rate of the current conduction stage. Compare the conduction duration error rate of the current conduction stage with the error rate threshold, and compare the trigger delay of the current conduction stage with the trigger delay threshold; If the conduction duration error rate of the current conduction stage is greater than or equal to the error rate threshold or the trigger delay is greater than or equal to the trigger delay threshold, stop conduction; If the conduction duration error rate of the current conduction stage 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: Compare the output current peak value of the current conduction stage with the output current threshold; If the output current peak value of the current conduction stage is greater than or equal to the output current threshold, obtain the conduction cycle number of the current conduction stage, and keep the conduction cycle number of the next conduction stage unchanged as that of the current conduction stage; If the output current peak value of the current conduction stage is less than the output current threshold, proceed to the next step; Step S343: Calculate the conduction cycle increment number \(DZ\) between adjacent conduction stages through the formula \(DZ=T_{i + 1}-T_i\); i -T i-1 If the conduction cycle increment number of any adjacent conduction stage is not equal to one, check the drive plug - in; If the conduction cycle increment numbers of all adjacent conduction stages are equal to one, proceed to the next step.

[0010] Furthermore, the monitoring process of step S4 includes the following sub - steps: Step S41: Set the ambient temperature of the triac to a fixed test temperature, and apply a sinusoidal half-wave alternating current to the triac. Step S42: Obtain the standard parameters of the triac. Step S43: Analyze the on-state current state of the triac based on the real-time current and voltage data and the standard parameters. Among them, the real-time current and voltage data are the real-time on-state current and the real-time on-state peak voltage of the triac. Among them, the analysis process in Step S43 includes the following sub-steps: Step S431: Collect the real-time on-state current of the triac at different time nodes at a fixed time interval, add up the real-time on-state currents of the power module at different time nodes, sum them up, and take the average value to obtain the real-time on-state average current. Step S432: Compare the real-time on-state average current of the triac with the maximum value of the on-state average 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, stop power supply. 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: Apply an instantaneous peak current to the triac, collect the on-state voltage of the triac in real time, traverse and compare the on-state voltages at different time nodes to obtain the maximum value of the on-state voltage, and record the maximum value of the on-state voltage as the real-time on-state peak voltage. Step S434: Compare the real-time on-state peak voltage of the triac 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, inspect the triac. 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.

[0011] Furthermore, the monitoring process in Step S5 includes the following sub-steps: Step S51: Collect the real-time temperature of the power module at different time nodes, subtract the real-time temperature of the previous time node from the real-time temperature of the power module at the current time node to obtain the real-time temperature change, and subtract 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 at the current time node. Step S52: Divide the on-state voltage change value by the real-time temperature change to obtain the voltage-temperature coefficient of the power module, and divide the difference between the voltage-temperature coefficient and the standard coefficient by the standard coefficient to obtain the coefficient deviation rate. Step S53: Compare 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, a warning is issued; If the coefficient deviation rate of the power module is less than the deviation rate threshold, continuous monitoring is performed.

[0012] In a second aspect, an electronic device is further provided, characterized in that the electronic device includes: A memory storing a computer program; A processor 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.

[0013] In a third aspect, a computer-readable storage medium is further 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 the power module in the switch cabinet is implemented.

[0014] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are: 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 thyristor during the soft start of the power module based on the electrical variables. When the power module performs a soft start, the operation states of the power modules in different conduction stages are analyzed, and the present invention realizes the analysis of different conduction stages of the power modules in the switch cabinet; 2. The present invention also monitors the operation state of the thyristor in the power module in the switch cabinet under the test environment, and monitors the operation state of the power module based on the change trends of the on-state voltage and temperature during the operation of the power module. The present invention also realizes the monitoring of the operation state of the power module in the switch cabinet during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 Is the method flow chart of the present invention; Figure 2 Is the schematic diagram of the internal plug-ins of the switch cabinet in the present invention; Figure 3 Is the schematic diagram of the half-wave period of the input current in the present invention; Figure 4 Is the structural schematic diagram of the electronic device in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0018] Embodiment 1: Please refer to Figures 1-3 As shown, the technical solution provided by the present invention is: A method for monitoring the operation of power modules in a switch cabinet, and the method is specifically as follows: Step S1, classify the plug-ins in the switch cabinet according to the circuit connection method; In this embodiment, the classification process in step S1 includes the following sub-steps: Step S11, please refer to Figure 1 As shown, obtain the circuit connection method between different plug-ins in the switch cabinet. If the input end of the plug-in is directly connected to the power supply bus and the output end of the plug-in is directly connected to the electrical 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 supply bus or the output end of the plug-in is not directly connected to the electrical load, then the corresponding plug-in is recorded as a split plug-in; Step S12, further subdivide the split plug-ins in the switch cabinet, specifically: If the output end of the split plug-in is not directly connected to the electrical load, then the corresponding split plug-in is recorded as a drive module; If the output end of the split plug-in is directly connected to the load, then the corresponding split plug-in is recorded as a power module; 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, and both the drive module and the power module in the split plug-in are independent plug-ins.

[0019] Step S2, measure the electrical variables and analyze the conduction state of the triac during the soft start of the power module based on the electrical variables; Among them, the triac is a semiconductor component used to control the current conduction inside the power module, and the electrical variables include the output current and output voltage of the drive plug-in; In this embodiment, the monitoring and analysis process of step S2 includes the following sub-steps: Step S21, use the output current of the drive plug-in as the gate current of the triac, and use the output voltage of the drive plug-in as the gate voltage of the triac; Step S22, compare the gate current of the triac with the gate trigger current, and compare the gate trigger voltage of the triac; When any one of the gate current of the triac 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 drive plug-in is abnormal, and then the drive plug-in is checked; When the gate current of the triac 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 indicates that the triac is in the conducting state, and then the next step is entered; Step S23, obtain the conduction time, cut-off time and re-conduction time of the triac; Step S24, subtract the conduction time from the cut-off time to obtain the conduction duration of the triac, and record the process of the triac from conduction to cut-off and then to re-conduction as the conduction stage of the triac; Step S25, divide the difference between the re-conduction time and the conduction time by the half-wave period of the input current to obtain the number of conduction stages of the triac, and divide the conduction stages of the triac into different conduction stages according to the ascending order of the conduction time; Exemplarily, if the conduction times of the conduction stages are 10:30, 10:31, and 10:33 respectively, the conduction stage with a conduction time of 10:30 is recorded as the first conduction stage, the conduction stage with a conduction time of 10:31 is recorded as the second conduction stage, and the conduction stage with a conduction time of 10:33 is recorded as the third conduction stage; Step S26, please refer to Figure 3 As shown, collect the input current frequency of the triac, collect the zero-crossing moments of the input current in different conduction stages, take the reciprocal of the input current frequency to obtain the input current period of the triac, and divide the input current period by two to obtain the half-wave period of the input current of the triac.

[0020] Step S3, when the power module performs soft start, analyze the operating states of the power modules in different conduction stages; In this embodiment, the analysis process of step S3 includes the following sub-steps: Step S31, record the number of half-wave periods of the input current passing through in a single conduction stage as the conduction cycle number, and record the conduction cycle numbers of different conduction stages as T i , where i is the number of different conduction stages, i = 1, 2,..., n, and n is a positive integer; It should be explained that the conduction cycle number of the first conduction stage is defaulted to 1; Step S32, collect the zero-crossing moment of the input current in the current conduction stage, multiply the conduction cycle number of the current conduction stage by the half-wave period of the input current to obtain the theoretical conduction duration of the current conduction stage, and subtract the zero-crossing moment of the input current from the conduction time of the triac in the current conduction stage to obtain the trigger delay of the current conduction stage; It should be noted that in this embodiment, the zero-crossing moment of the input current is the moment when the voltage of the input current crosses zero from negative to positive; Step S33: Traverse and compare the output currents within a single conduction stage to obtain the maximum value of the output current, and use the maximum value of the output current as the output current peak value corresponding to the conduction stage; Step S34: Analyze the current conduction stage of the triac to analyze whether the soft start process of the power module is in a normal state; Further, the analysis process of step S34 includes the following sub-steps: Step S341: Divide the conduction duration by the theoretical conduction duration to obtain the conduction duration error rate of the current conduction stage, compare the conduction duration error rate of the current conduction stage with the error rate threshold, and compare the trigger delay of the current conduction stage with the trigger delay threshold; If the conduction duration error rate of the current conduction stage is greater than or equal to the error rate threshold or the trigger delay is greater than or equal to the trigger delay threshold, stop conduction; If the conduction duration error rate of the current conduction stage 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: Compare the output current peak value of the current conduction stage with the output current threshold; If the output current peak value of the current conduction stage 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, obtain the number of conduction cycles of the current conduction stage, and keep the number of conduction cycles of the next conduction stage unchanged as that of the current conduction stage; If the output current peak values of all current conduction stages are less than the output current threshold, it indicates that the output current of the power module is in a normal state, and proceed to the next step; In this embodiment, the output current threshold is set to 2.5 times the rated current of the power module; Step S343: Calculate the conduction cycle increment number DZ of adjacent conduction stages through the formula DZ = T i -T i-1 If the conduction cycle increment number of any adjacent conduction stage is not equal to one, check the drive plug-in; If the conduction cycle increment numbers of all adjacent conduction stages are equal to one, proceed to the next step.

[0021] Step S4: Monitor the operating state of the triac in the power module under the test environment; In this embodiment, the monitoring process of step S4 includes the following sub-steps: Step S41: Set the ambient temperature of the triac to a fixed test temperature, and apply a sinusoidal half-wave alternating current to the triac. In this embodiment, the fixed test temperature is 85 degrees Celsius, and the sinusoidal half-wave alternating current: the current waveform flowing through the triac during testing is half a cycle of a sine wave, and the waveform shape is half of a standard sine curve. Step S42: Obtain the standard parameters of the triac, as shown in the following table: In this embodiment, the power module is a 380V - 20kW power module. Step S43: Analyze the on-state current state of the triac based on the real-time current and voltage data and the standard parameters. Among them, the real-time current and voltage data are the real-time on-state current and the real-time on-state peak voltage of the triac. Furthermore, the analysis process in step S43 includes the following sub-steps: Step S431: Collect the real-time on-state current of the triac at different time nodes at a fixed time interval, add up the real-time on-state currents of the power module at different time nodes and take the average to obtain the real-time on-state average current. Among them, 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. Step S432: Compare the real-time on-state average current of the triac with the maximum value of the on-state average 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, it indicates that the on-state average current of the triac is abnormal, and 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: Apply an instantaneous peak current to the triac, collect the on-state voltage of the triac in real time, traverse and compare the on-state voltages at different time nodes to obtain the maximum value of the on-state voltage, and record the maximum value of the on-state voltage as the real-time on-state peak voltage. In this embodiment, the instantaneous peak current is 170A. Step S434: Compare the real-time on-state peak voltage of the triac 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, it indicates that the triac is abnormal, and the triac is inspected. 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.

[0022] Step S5: Monitor the operating state of the power module based on the changing trends of the on-state voltage and temperature during the operation of the power module. Specifically, the monitoring process in step S5 includes the following sub-steps: Step S51: Collect the real-time temperature of the power module at different time nodes. Subtract the real-time temperature of the power module at the previous time node from the real-time temperature of the power module at the current time node to obtain the real-time temperature change. Subtract the on-state voltage at the previous time node from the on-state voltage at the current time node to obtain the on-state voltage change value at the current time node. Step S52: Divide the on-state voltage change value by the real-time temperature change to obtain the voltage-temperature coefficient of the power module. Subtract the standard coefficient from the voltage-temperature coefficient and then divide the result by the standard coefficient to obtain the coefficient deviation rate. It should be noted that the standard coefficient can be obtained from the user manual of the corresponding module. Step S53: Compare 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, give an alarm. If the coefficient deviation rate of the power module is less than the deviation rate threshold, conduct continuous monitoring.

[0023] In this application, if there are corresponding calculation formulas, the above calculation formulas are all calculated by taking the numerical values without dimensions. The coefficient such as the weight coefficient and the proportional coefficient in the formula is set to obtain a result value by quantifying each parameter. Regarding the magnitudes of the weight coefficient and the proportional coefficient, as long as the proportional relationship between the parameters and the result value is not affected.

[0024] Embodiment 2: Figure 4 It is a schematic structural diagram of an electronic device, which may include: a processor, a communications interface, a memory, and a communication bus. Among them, the processor, the communications interface, and the memory communicate with each other through the communication bus. The processor can call the logical instructions in the memory to execute a method for monitoring the operation of the power module in a switch cabinet, and the method includes: classifying the plug-ins in the switch cabinet according to the circuit connection mode; measuring the electrical variables and analyzing the conduction state of the triac during the soft start of the power module based on the electrical variables; when the power module performs a soft start, analyzing the operation state of the power module in different conduction stages; monitoring the operation state of the triac in the power module under the test environment; monitoring the operation state of the power module based on the change trends of the on-state voltage and temperature during the operation of the power module.

[0025] In addition, when the logical instructions in the above-mentioned memory are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0026] On the other hand, the present application also provides a computer program product. The computer program product includes a computer program stored on a computer-readable storage medium. 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 switchgear cabinet provided by the above-mentioned various methods. The method includes: classifying the plug-ins in the switchgear cabinet according to the circuit connection mode; measuring electrical variables and analyzing the conduction state of the thyristor during the soft start of the power module based on the electrical variables; when the power module is in soft start, analyzing the operation states of the power modules in different conduction stages; monitoring the operation state of the thyristor in the power module under a test environment; and monitoring the operation state of the power module based on the changing trends of the on-state voltage and temperature during the operation of the power module.

[0027] On another aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute a method for monitoring the operation of a power module in a switchgear cabinet provided by the above-mentioned various methods. The method includes: classifying the plug-ins in the switchgear cabinet according to the circuit connection mode; measuring electrical variables and analyzing the conduction state of the thyristor during the soft start of the power module based on the electrical variables; when the power module is in soft start, analyzing the operation states of the power modules in different conduction stages; monitoring the operation state of the thyristor in the power module under a test environment; and monitoring the operation state of the power module based on the changing trends of the on-state voltage and temperature during the operation of the power module.

[0028] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0029] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part 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, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 switchgear cabinet, characterized in that, The method includes the following steps: Step S1, classify the plug-ins in the switchgear cabinet according to the circuit connection method; Step S2, measure the electrical variables and analyze the conduction state of the triac during the soft start of the power module according to the electrical variables; Step S3, when the power module performs a soft start, analyze the operating states of the power modules in different conduction stages; Step S4, monitor the operating state of the triac in the power module under the test environment; Step S5, monitor the operating state of the power module according to the changing trends of the on-state voltage and temperature during the operation of the power module.

2. The operating monitoring method for a power module in a switch cabinet according to claim 1, characterized in that The classification process in the said Step S1 includes the following sub-steps: Step S11, obtain the circuit connection method between different plug-ins in the switchgear cabinet. If the input end of the plug-in is directly connected to the power supply bus and the output end of the plug-in is directly connected to the electrical load, then mark the corresponding plug-in as an integrated plug-in; If the input end of the plug-in is not directly connected to the power supply bus or the output end of the plug-in is not directly connected to the electrical load, then mark the corresponding plug-in as a split plug-in; Step S12, further subdivide the split plug-ins in the switchgear cabinet, specifically: If the output end of the split plug-in is not directly connected to the electrical load, then mark the corresponding split plug-in as a drive module; If the output end of the split plug-in is directly connected to the load, then mark the corresponding split plug-in as a power module.

3. A method for monitoring the operation of a power module in a switchgear cabinet according to claim 2, characterized in that, The monitoring and analysis process in the said Step S2 includes the following sub-steps: Step S21, use the output current of the drive plug-in as the gate current of the triac and the output voltage of the drive plug-in as the gate voltage of the triac; Step S22, compare the gate current of the triac with the gate trigger current and compare the gate trigger voltage of the triac; When there is any item that the gate current of the triac is less than the gate trigger current or the gate voltage is less than the gate trigger voltage, then check the drive plug-in; When the gate current of the triac is greater than or equal to the gate trigger current and the gate voltage is greater than or equal to the gate trigger voltage, then enter the next step.

4. A 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 in the said Step S2 also includes the following sub-steps: Step S23, obtain the conduction time, cut-off time and re-conduction time of the triac; Step S24, subtract the conduction time from the cut-off time to get the conduction duration of the triac, and record the process of the triac from conduction to cut-off and then to re-conduction as the conduction stage of the triac; Step S25, divide the value obtained by subtracting the conduction time from the re-conduction time by the half-wave period of the input current to get the number of conduction stages of the triac, and divide the conduction stages of the triac into different conduction stages according to the ascending order of the conduction time; Step S26, collect the input current frequency of the triac, collect the zero-crossing moments of the input current in different conduction stages, take the reciprocal of the input current frequency to get the input current period of the triac, and divide the input current period by two to get the half-wave period of the input current of the triac.

5. A method for monitoring the operation of a power module in a switch cabinet according to claim 4, characterized in that, The analysis process in the said Step S3 includes the following sub-steps: Step S31: Denote the number of input current half-wave cycles passed within a single conduction stage as the conduction cycle number, and denote the conduction cycle numbers of different conduction stages as T i , where i is the number of different conduction stages, i = 1, 2, ……, n, and n is a positive integer; Step S32: Collect the zero-crossing moment of the input current in the current conduction stage. Multiply the number of conduction cycles in the current conduction stage by the half-wave period of the input current to obtain the theoretical conduction duration of the current conduction stage. Subtract the zero-crossing moment of the input current from the conduction time of the triac in the current conduction stage to obtain the trigger delay of the current conduction stage. Step S33: Traverse and compare the output currents within a single conduction stage to obtain the maximum value of the output current, and use the maximum value of the output current as the output current peak value corresponding to the conduction stage. Step S34: Analyze the current conduction stage of the triac to determine whether the soft start process of the power module is in a normal state.

6. A method for monitoring the operation of a power module in a switch cabinet according to claim 5, characterized in that, The analysis process of step S34 includes the following sub-steps: Step S341: Divide the conduction duration by the theoretical conduction duration to obtain the conduction duration error rate of the current conduction stage. Compare the conduction duration error rate of the current conduction stage with the error rate threshold, and compare the trigger delay of the current conduction stage with the trigger delay threshold. If the conduction duration error rate of the current conduction stage is greater than or equal to the error rate threshold or the trigger delay is greater than or equal to the trigger delay threshold, stop conduction. If the conduction duration error rate of the current conduction stage 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: Compare the output current peak value of the current conduction stage with the output current threshold. If the output current peak value of the current conduction stage is greater than or equal to the output current threshold, obtain the number of conduction cycles of the current conduction stage, and keep the number of conduction cycles of the next conduction stage unchanged as that of the current conduction stage. If the output current peak values of all current conduction stages are less than the output current threshold, proceed to the next step. Step S343, calculate the increase number DZ of the conduction period between adjacent conduction phases through the formula DZ = T i - T i-1 If the increase number DZ of the conduction period between any adjacent conduction phases is not equal to one, check the drive plug-in unit. If the increment of the number of conduction cycles in all adjacent conduction stages is equal to one, proceed to the next step.

7. A method for monitoring the operation of a power module in a switch cabinet according to claim 6, characterized in that, The monitoring process of step S4 includes the following sub-steps: Step S41: Set the ambient temperature of the triac to a fixed test temperature, and apply a sinusoidal half-wave alternating current to the triac. Step S42: Obtain the standard parameters of the triac. Step S43: Analyze the on-state current state of the triac based on the real-time current and voltage data and the standard parameters. Among them, the real-time current and voltage data are the real-time on-state current and the real-time on-state peak voltage of the triac. Among them, the analysis process in step S43 includes the following sub-steps: Step S431: Collect the real-time on-state current of the triac at different time nodes at fixed time intervals, add up the real-time on-state currents of the power module at different time nodes and take the average to obtain the real-time on-state average current. Step S432: Compare the real-time on-state average current of the triac with the maximum value of the on-state average 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, stop power supply. 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: Apply an instantaneous peak current to the triac, collect the on-state voltage of the triac in real time, traverse and compare the on-state voltages at different time nodes to obtain the maximum value of the on-state voltage, and record the maximum value of the on-state voltage as the real-time on-state peak voltage; Step S434: Compare the real-time on-state peak voltage of the triac 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 triac; 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.

8. A method for monitoring the operation of a power module in a switchgear cabinet according to claim 7, characterized in that, The monitoring process in step S5 includes the following sub-steps: Step S51: Collect the real-time temperature of the power module at different time nodes, subtract the real-time temperature of the power module at the previous time node from the real-time temperature of the power module at the current time node to obtain the real-time temperature change, and subtract the on-state voltage at the previous time node from the on-state voltage at the current time node to obtain the on-state voltage change value at the current time node; Step S52: Divide the on-state voltage change value by the real-time temperature change to obtain the voltage-temperature coefficient of the power module, and divide the result of subtracting the standard coefficient from the voltage-temperature coefficient by the standard coefficient to obtain the coefficient deviation rate; Step S53: Compare 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, issue a warning; If the coefficient deviation rate of the power module is less than the deviation rate threshold, continue monitoring.

9. An electronic device, characterized in that, The electronic device includes: A memory storing a computer program; A processor communicatively connected to the memory, and when the computer program is executed by the processor, the method according to any one of claims 1-8 is implemented.

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

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