Intelligent short-circuit optimization system, method and device based on back electromotive force

Abstract

The present invention discloses an intelligent short-circuit optimization system, method and device based on reverse electromotive force, and relates to the technical field of short-circuit optimization monitoring of power equipment. The intelligent short-circuit optimization system based on reverse electromotive force includes: a reverse electromotive force identification module; an intelligent undervoltage protection module; a parameter monitoring module of the equipment to be protected; and a temperature control module. The present invention monitors the change of reverse electromotive force in a preset time period in real time to obtain the fault interference coefficient, and then performs undervoltage protection on the short-circuit fault according to the undervoltage protection parameter to obtain the safety protection coefficient, and finally monitors the temperature rise change of the equipment to be protected in real time to obtain the temperature control parameter evaluation value, and determines whether to perform the temperature control parameter adjustment according to the obtained temperature control parameter evaluation value and the temperature control evaluation threshold interval, thereby achieving the improvement of the reliability of short-circuit optimization of reverse electromotive force in the process of intelligent undervoltage protection, and solves the problem of low reliability of short-circuit optimization of reverse electromotive force in the process of intelligent undervoltage protection in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of short-circuit optimization monitoring of electric power equipment, and in particular to an intelligent short-circuit optimization system, method and device based on reverse electromotive force. Background Art

[0002] With the rapid development of power electronics technology and the continuous improvement of industrial automation, motors, as key power conversion equipment, have been widely used in various fields. Back electromotive force (BEMF), as an important characteristic of the motor, is closely related to the operating state of the motor. When the motor is operating normally, the BEMF is related to factors such as the motor's speed, magnetic flux, and winding structure. When a short-circuit fault occurs in the motor, the BEMF changes, and this change makes it possible to detect and optimize the short-circuit fault. However, the motor may encounter various faults during operation, among which short-circuit fault is a common one. Short-circuit faults not only affect the normal operation of the motor, but may also cause damage to the entire system. Therefore, how to quickly and accurately detect and optimize motor short-circuit faults has become an urgent problem to be solved.

[0003] The existing technology establishes a mathematical model through the physical structure and electrical characteristics of the motor, and simulates the impact of the short-circuit fault on the motor's back electromotive force based on the mathematical model. Then, the back electromotive force residual under the short-circuit fault state is extracted from the motor operation data and harmonic analysis is performed. Finally, based on the results of the harmonic analysis, the short-circuit fault is located and the motor control strategy is adjusted, thereby optimizing the motor's operating performance.

[0004] For example, the invention patent announcement with announcement number: CN111626463B discloses a method for parallel coordination of short-circuit current in a power system based on Hadoop architecture, including: obtaining the optimal power network segmentation pattern by adopting a network segmentation optimization method of node tearing and segmentation conversion; dividing the power network into more than one sub-networks and a coordination network that connects the coupling relationships between the sub-networks, and reducing the dimension of the power system blocks in the form of node splitting; and realizing parallel coordination of short-circuit current by combining the MapReduce framework under the Hadoop cluster.

[0005] For example, the patent application with publication number: CN117114188A discloses a short-circuit ratio optimization calculation method and system for the access of multiple new energy stations to the regional power grid, including: obtaining typical operating mode data of the access of multiple new energy stations to the regional power grid, and converting the typical operating mode data into data to be analyzed suitable for short-circuit current scanning calculation; according to the data to be analyzed, calculating the key node system short-circuit current K1 when the node is open when the multiple new energy stations are connected to the regional power grid; based on the impact of the new energy power generation units of the access of multiple new energy stations to the regional power grid on the system current short circuit, according to the data to be analyzed, calculating the key node system short-circuit current K2 when the node is connected when the multiple new energy stations are connected to the regional power grid; calculating the conversion coefficient K based on the K1, K2 and the short-circuit ratio, and calculating the short-circuit ratio of the access of multiple new energy stations.

[0006] However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems:

[0007] In the prior art, the reverse electromotive force of the equipment is small during low-speed operation, which leads to reduced detection sensitivity of the equipment measuring instrument, thereby affecting the timeliness and efficiency of short-circuit fault detection. There is a problem of low reliability of short-circuit optimization of reverse electromotive force during intelligent undervoltage protection. Summary of the invention

[0008] The embodiments of the present application solve the problem of low reliability of short-circuit optimization of reverse electromotive force during intelligent undervoltage protection in the prior art by providing an intelligent short-circuit optimization system, method and device based on reverse electromotive force, thereby improving the reliability of short-circuit optimization of reverse electromotive force during intelligent undervoltage protection.

[0009] The embodiment of the present application provides an intelligent short-circuit optimization system based on reverse electromotive force, including: a reverse electromotive force identification module, an intelligent undervoltage protection module, a parameter monitoring module of a device to be protected, and a temperature control module;

[0010] Among them, the reverse electromotive force identification module is used to obtain the functional data of the equipment to be protected and identify the reverse electromotive force of the equipment to be protected during operation within a preset time period in combination with the non-directional electromotive force sensor, and monitor the change of the reverse electromotive force within the preset time period in real time to obtain the fault interference coefficient, and the fault interference coefficient is used to determine the short-circuit fault level of the equipment to be protected when a short-circuit fault occurs under the reverse electromotive force condition; the intelligent undervoltage protection module is used to perform undervoltage protection on the short-circuit fault according to the undervoltage protection parameters, and monitor the undervoltage protection process of the equipment to be protected through a capacitor-free non-contact induction circuit breaker; the parameter monitoring module of the equipment to be protected is used to monitor the operating state of the equipment to be protected during the undervoltage protection process according to the obtained safety protection coefficient to obtain the temperature control evaluation threshold interval, and the safety protection coefficient is used to reflect the safety protection degree of the short-circuit fault during the undervoltage protection process; the temperature control module is used to monitor the temperature rise change of the temperature control parameters of the equipment to be protected during operation in real time to obtain the temperature control parameter evaluation value, and at the same time determine whether to perform temperature control parameter adjustment according to the temperature control parameter evaluation value and the temperature control evaluation threshold interval, and the temperature control parameter evaluation value is used to evaluate the heat dissipation degree of the equipment to be protected during operation.

[0011] Furthermore, the steps for obtaining the fault interference coefficient are as follows: A1, obtaining the actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time of the device to be protected under a short-circuit fault; A2, judging whether the actual short-circuit current peak avoidance time is less than the reference short-circuit current peak avoidance time, if so, executing A3, otherwise executing A4; A3, judging whether the actual arc extinguishing chamber insulation strength recovery time is less than the reference arc extinguishing chamber insulation strength recovery time, if so, executing A4 as a judgment condition, otherwise directly executing A4; A4, combining the obtained actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time to obtain the fault interference coefficient; the specific limiting expression of the fault interference coefficient is:

[0012] ;

[0013] Where t is the number of the preset time period, , T is the total number of preset time periods, e is a natural constant, It represents the fault interference coefficient of the equipment to be protected during operation in the tth preset time period. It represents the reverse electromotive force of the equipment to be protected during operation in the tth preset time period. Indicates the back electromotive force detection threshold range in the non-directional electromotive force sensor, It indicates the actual short-circuit current peak avoidance time of the equipment to be protected during the short-circuit fault operation in the tth preset time period. Indicates the reference short-circuit current peak avoidance time. It indicates the actual arc extinguishing chamber insulation strength recovery time of the protected equipment during the short-circuit fault operation in the tth preset time period. Indicates the reference arc extinguishing chamber insulation strength recovery time.

[0014] Furthermore, the safety protection factor is obtained by the following method: C1, obtaining the actual operating parameters of the capacitor-free non-contact inductive circuit breaker of the protected equipment under short-circuit fault during the undervoltage protection process, and the actual operating parameters include the actual undervoltage detection sensitivity, the actual intelligent protection response time and the actual controller self-test cycle; C2, judging whether the actual undervoltage detection sensitivity obtained is less than the reference undervoltage detection sensitivity, if so, it indicates that the actual undervoltage detection sensitivity meets the undervoltage detection sensitivity requirement of the undervoltage protection, otherwise execute C3; C3, judging whether the actual intelligent protection response time obtained is less than the reference intelligent protection response time, if so, it indicates that the actual intelligent protection response time meets the intelligent protection response time requirement of the undervoltage protection, otherwise execute C4; C4, judging whether the actual controller self-test cycle obtained is greater than the reference controller self-test cycle, if so, it indicates that the actual controller self-test cycle meets the controller self-test cycle requirement of the undervoltage protection, otherwise execute C 5; C5, when the actual pressure loss detection sensitivity is less than the reference pressure loss detection sensitivity, the actual intelligent protection response time is less than the reference intelligent protection response time and the actual controller self-test period is greater than the reference controller self-test period, the safety protection coefficient is recorded as 1, otherwise execute C6; C6, combine the actual operating parameters and the parameters of the equipment to be protected to obtain the detection sensitivity coefficient, response time coefficient and self-test period coefficient, and perform addition and exponential operations to obtain the safety protection coefficient; the detection sensitivity coefficient is the ratio of the difference calculation result of the actual pressure loss detection sensitivity and the reference pressure loss detection sensitivity to the reference pressure loss detection sensitivity; the response time coefficient is the complement of the ratio of the difference calculation result of the actual intelligent protection response time and the reference intelligent protection response time to the reference intelligent protection response time; the self-test period coefficient is the complement of the ratio of the difference calculation result of the actual controller self-test period and the reference controller self-test period to the reference controller self-test period.

[0015] Furthermore, the short-circuit fault is protected against voltage loss according to the safety protection factor, and then includes early warning feedback, which is used to prevent the interlocking operation of the equipment to be protected; the specific process of the early warning feedback is: real-time monitoring of the voltage waveform and current waveform of the equipment to be protected during the short-circuit fault operation by an oscilloscope, and real-time monitoring of the changes in the voltage waveform and current waveform within a preset time period to obtain the voltage fluctuation amplitude and the current fluctuation amplitude, the voltage fluctuation amplitude is used to reflect the fluctuation of the voltage of the equipment to be protected within the preset time period, and the current fluctuation amplitude is used to reflect the fluctuation of the current of the equipment to be protected within the preset time period; when the voltage fluctuation amplitude is within the voltage fault threshold range and the current fluctuation amplitude is within the current fault threshold range, the early warning signal is fed back to the operation and maintenance personnel of the equipment to be protected through sound and light alarms, and the early warning signal includes the fault type and fault location.

[0016] Furthermore, the specific steps for obtaining the temperature control parameter evaluation value include: D1, judging whether the starting temperature of the equipment to be protected is lower than the reference starting temperature, if so, executing D2, otherwise not starting the equipment to be protected until the starting temperature is lower than the reference starting temperature; D2, real-time monitoring of the operating temperature of the equipment to be protected during operation within a preset time period and obtaining the cooling efficiency coefficient of the equipment to be protected in combination with the starting temperature, wherein the cooling efficiency coefficient is the ratio of the difference operation result between the operating temperature and the starting temperature to the starting temperature; D3, real-time monitoring of the input vibration amplitude of the equipment to be protected when it starts to operate within a preset time period and the output vibration amplitude when it ends to obtain the vibration isolation efficiency coefficient through a vibration sensor, wherein the vibration isolation efficiency coefficient is the complement of the operation result of the ratio of the output vibration amplitude to the input vibration amplitude; D4, obtaining the temperature control parameter evaluation value according to the results of addition and exponential operation of the obtained cooling efficiency coefficient and vibration isolation efficiency coefficient and combining with the starting temperature coefficient, wherein the starting temperature coefficient is the complement of the operation result of the ratio of the starting temperature to the reference starting temperature.

[0017] The embodiment of the present application provides an intelligent short-circuit optimization method based on reverse electromotive force, comprising the following steps: step one, obtaining functional data of the device to be protected and identifying the reverse electromotive force of the device to be protected during operation within a preset time period in combination with a non-directional electromotive force sensor, real-time monitoring of the change of the reverse electromotive force within the preset time period to obtain a fault interference coefficient, the fault interference coefficient is used to determine the short-circuit fault level of the device to be protected under the reverse electromotive force condition, the short-circuit fault level includes a primary fault, a secondary fault and a tertiary fault; step two, performing undervoltage protection on the short-circuit fault according to the undervoltage protection parameter, and at the same time, A capacitor-free non-contact induction circuit breaker monitors the undervoltage protection process of the equipment to be protected; step three, monitor the operating status of the equipment to be protected during the undervoltage protection process according to the obtained safety protection factor to obtain the temperature control evaluation threshold range, and the safety protection factor is used to reflect the safety protection level of the short circuit fault during the undervoltage protection process; step four, real-time monitoring of the temperature rise changes of the temperature control parameters of the equipment to be protected during operation to obtain the temperature control parameter evaluation value, and at the same time, determine whether to perform the temperature control parameter adjustment according to the temperature control parameter evaluation value and the temperature control evaluation threshold range, and the temperature control parameter evaluation value is used to evaluate the heat dissipation degree of the equipment to be protected during operation.

[0018] An embodiment of the present application provides a device that applies an intelligent short-circuit optimization system based on reverse electromotive force, including: a non-directional electromotive force sensor, a capacitor-free non-contact inductive circuit breaker and a controller; the non-directional electromotive force sensor is used to identify the reverse electromotive force of the equipment to be protected during operation within a preset time period; the capacitor-free non-contact inductive circuit breaker is used to monitor the undervoltage protection process of the equipment to be protected; and the controller is used to visualize the detection cycle of the equipment to be protected during the undervoltage protection process.

[0019] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0020] 1. By real-time monitoring of the changes in reverse electromotive force within a preset time period to obtain the fault interference coefficient, then performing undervoltage protection on the short-circuit fault according to the undervoltage protection parameters to obtain the safety protection coefficient, and finally monitoring the temperature rise changes of the equipment to be protected in real time to obtain the temperature control parameter evaluation value, and at the same time, judging whether to perform temperature control parameter adjustment based on the temperature control parameter evaluation value and the temperature control evaluation threshold range, thereby achieving a more accurate judgment of the temperature control parameter adjustment, and then achieving the improvement of the short-circuit optimization reliability of reverse electromotive force in the process of intelligent undervoltage protection, effectively solving the problem of low short-circuit optimization reliability of reverse electromotive force in the process of intelligent undervoltage protection in the prior art.

[0021] 2. By judging whether the actual short-circuit current peak avoidance time of the equipment to be protected under a short-circuit fault is less than the reference short-circuit current peak avoidance time, if it is, then judging whether the actual arc extinguishing chamber insulation strength recovery time is less than the reference arc extinguishing chamber insulation strength recovery time, otherwise, the fault interference coefficient is obtained by combining the actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time, thereby achieving improved monitoring accuracy under short-circuit fault of the equipment to be protected, and further achieving improved accuracy and reliability in obtaining the fault interference coefficient.

[0022] 3. By judging whether the obtained temperature control parameter evaluation value is within the temperature control evaluation threshold range, if so, the obtained temperature control parameter evaluation value is stored in the preset database, otherwise the temperature control parameter adjustment is performed and the temperature rise change of the equipment to be protected during the temperature control parameter adjustment process is monitored in real time, and the module parameters are optimized according to the obtained temperature control parameter evaluation value, thereby achieving a more accurate judgment of the temperature control parameter evaluation value, and then achieving a more accurate optimization of the equipment to be protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an intelligent short-circuit optimization system based on reverse electromotive force provided in an embodiment of the present application;

[0024] Figure 2 A flowchart for obtaining a safety protection factor provided in an embodiment of the present application;

[0025] Figure 3 A flow chart of an intelligent short-circuit optimization method based on reverse electromotive force provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The embodiments of the present application solve the problem of low reliability of short-circuit optimization of reverse electromotive force in the intelligent undervoltage protection process in the prior art by providing an intelligent short-circuit optimization system, method and device based on reverse electromotive force. The reverse electromotive force of the device to be protected during operation within a preset time period is obtained through a reverse electromotive force identification module to obtain a fault interference coefficient. Then, the intelligent undervoltage protection module performs undervoltage protection on the short-circuit fault according to the undervoltage protection parameters. At the same time, a capacitor-free non-contact induction circuit breaker is used to monitor the undervoltage protection process of the device to be protected. Then, the parameter monitoring module of the device to be protected monitors the operating status of the device to be protected during the undervoltage protection process according to the obtained safety protection coefficient to obtain a temperature control evaluation threshold range. Finally, the temperature control module monitors the temperature rise change of the temperature control parameters of the device to be protected during operation in real time to obtain a temperature control parameter evaluation value. At the same time, it is determined whether to perform temperature control parameter adjustment based on the temperature control parameter evaluation value and the temperature control evaluation threshold range, thereby improving the reliability of short-circuit optimization of reverse electromotive force in the intelligent undervoltage protection process.

[0027] The technical solution in the embodiment of the present application is to solve the problem of low reliability of short-circuit optimization in the process of intelligent voltage loss protection of the above-mentioned reverse electromotive force. The overall idea is as follows:

[0028] By real-time monitoring of the changes in reverse electromotive force within a preset time period to obtain the fault interference coefficient, and then performing undervoltage protection on the short-circuit fault according to the undervoltage protection parameters to obtain the safety protection coefficient, finally, real-time monitoring of the temperature rise changes of the equipment to be protected to obtain the temperature control parameter evaluation value, and at the same time, judging whether to perform temperature control parameter adjustment based on the temperature control parameter evaluation value and the temperature control evaluation threshold range, the effect of improving the short-circuit optimization reliability of reverse electromotive force in the intelligent undervoltage protection process is achieved.

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1 As shown, it is a structural schematic diagram of an intelligent short-circuit optimization system based on reverse electromotive force provided in an embodiment of the present application. The intelligent short-circuit optimization system based on reverse electromotive force provided in an embodiment of the present application includes: a reverse electromotive force identification module, an intelligent undervoltage protection module, a parameter monitoring module of the device to be protected, and a temperature control module; wherein the reverse electromotive force identification module is used to obtain the functional data of the device to be protected and identify the reverse electromotive force of the device to be protected during operation within a preset time period in combination with the non-directional electromotive force sensor, and monitor the change of the reverse electromotive force within the preset time period in real time to obtain the fault interference coefficient, and the fault interference coefficient is used to judge the short-circuit fault level of the device to be protected when a short-circuit fault occurs under the reverse electromotive force condition, and the short-circuit fault levels include primary fault, secondary fault and tertiary fault Fault; the intelligent undervoltage protection module is used to perform undervoltage protection on short-circuit faults according to the undervoltage protection parameters, and at the same time monitors the undervoltage protection process of the equipment to be protected through a capacitor-free non-contact induction circuit breaker; the parameter monitoring module of the equipment to be protected is used to monitor the operating status of the equipment to be protected during the undervoltage protection process according to the obtained safety protection factor to obtain the temperature control evaluation threshold range, and the safety protection factor is used to reflect the safety protection degree of the short-circuit fault during the undervoltage protection process; the temperature control module is used to monitor the temperature rise change of the temperature control parameters of the equipment to be protected during operation in real time to obtain the temperature control parameter evaluation value, and at the same time determine whether to perform the temperature control parameter adjustment according to the temperature control parameter evaluation value and the temperature control evaluation threshold range, and the temperature control parameter evaluation value is used to evaluate the heat dissipation degree of the equipment to be protected during operation.

[0031] In this embodiment, in the application scenario of power equipment (such as motors in substations), functional data generally include telemetry data, telesignaling data, remote control data and remote adjustment data, wherein telemetry data refers to the voltage and current of the motor during operation measured in real time by voltage sensors and current sensors deployed at the motor power connection point, remote signaling data refers to the switch state of the motor obtained by the switch state sensor deployed on the motor switch contact line (where 1 represents the switch is open and 0 represents the switch is closed), remote control data refers to the opening data or closing data of the circuit breaker in the motor obtained by the remote control data collector deployed on the motor switch contact line (where 1 represents the circuit breaker is open and 0 represents the circuit breaker is closed), and remote adjustment data refers to the remote terminal unit (RTU) with a shake adjustment function deployed on the circuit breaker at the motor control center. The output voltage and output current of the motor obtained by the remote sensing terminal of the protected equipment; the temperature control parameter (referring to the reference value of the temperature control module of the protected equipment before starting) includes the reference starting temperature, the reference cooling efficiency coefficient and the reference vibration isolation efficiency coefficient, wherein the reference starting temperature is represented by the sum and average of the historical starting temperatures of the power equipment in the preset database, the reference cooling efficiency coefficient is represented by the sum and average of the historical cooling efficiency coefficients of the power equipment in the preset database, and the reference vibration isolation efficiency coefficient is represented by the sum and average of the historical recovery efficiencies of the power equipment when vibration occurs in the preset database.

[0032] Specifically, the non-directional electromotive force sensor includes short-circuit avoidance parameters, which include a reverse electromotive force detection threshold interval, a reference short-circuit current peak avoidance time, and a reference arc extinguishing chamber insulation strength recovery time, wherein the reverse electromotive force detection threshold interval is the range corresponding to the historical maximum and minimum reverse electromotive force values ​​during the operation of the power protection equipment in a preset database, the reference short-circuit current peak avoidance time is represented by the sum and average of the time for avoiding the historical short-circuit current peak during the operation of the power equipment in the preset database, and the reference arc extinguishing chamber insulation strength recovery time is represented by the sum and average of the historical recovery time of the insulation strength of the arc extinguishing chamber in the power equipment in the preset database.

[0033] It should be understood that the reverse electromotive force detection threshold interval is used to determine whether the device to be protected has a short-circuit fault; the specific process for determining whether the device to be protected has a short-circuit fault is: determine whether the reverse electromotive force is within the reverse electromotive force detection threshold interval. If so, it indicates that the device to be protected is operating normally, otherwise it indicates that the device to be protected has a short-circuit fault. By directly monitoring the physical quantity of reverse electromotive force and comparing it with the reverse electromotive force detection threshold interval, the working state of the device to be protected can be more accurately determined, thereby timely discovering short-circuit faults (that is, the direction of the induced electromotive force generated by the stator winding of the device to be protected during operation is opposite to the direction of the voltage when the device to be protected is started), improving the real-time and accuracy of short-circuit fault detection, and realizing the improvement of the reliability of short-circuit optimization of reverse electromotive force during intelligent undervoltage protection.

[0034] Furthermore, the steps for obtaining the fault interference coefficient are as follows: A1, obtaining the actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time of the device to be protected under a short-circuit fault; A2, judging whether the actual short-circuit current peak avoidance time is less than the reference short-circuit current peak avoidance time, if less than, indicating that the actual short-circuit current peak avoidance time has no effect on the short-circuit fault and executing A3, otherwise executing A4; A3, judging whether the actual arc extinguishing chamber insulation strength recovery time is less than the reference arc extinguishing chamber insulation strength recovery time, if less than, indicating that the actual arc extinguishing chamber insulation strength recovery time has no effect on the short-circuit fault and executing A4 as a judgment condition, otherwise directly executing A4; A4, combining the obtained actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time to obtain the fault interference coefficient; the specific restriction expression of the fault interference coefficient is:

[0035] ;

[0036] Where t is the number of the preset time period, , T is the total number of preset time periods, e is a natural constant, It represents the fault interference coefficient of the equipment to be protected during operation in the tth preset time period. It represents the reverse electromotive force of the equipment to be protected during operation in the tth preset time period. Indicates the back electromotive force detection threshold range in the non-directional electromotive force sensor, It indicates the actual short-circuit current peak avoidance time of the equipment to be protected during the short-circuit fault operation in the tth preset time period. Indicates the reference short-circuit current peak avoidance time. It indicates the actual arc extinguishing chamber insulation strength recovery time of the protected equipment during the short-circuit fault operation in the tth preset time period. Indicates the reference arc extinguishing chamber insulation strength recovery time.

[0037] In this embodiment, when the reverse electromotive force is within the reverse electromotive force detection threshold interval, it indicates that the device to be protected is operating normally within the preset time period (that is, the direction of the induced electromotive force generated by the stator winding of the device to be protected during operation is the same as the direction of the voltage when the device to be protected is just started), and the device to be protected does not have a short-circuit fault at this time (that is, there is no need to consider the relationship between the actual short-circuit current peak avoidance time and the reference short-circuit current peak avoidance time, and the relationship between the actual arc extinguishing chamber insulation strength recovery time and the reference arc extinguishing chamber insulation strength recovery time), and the corresponding fault interference coefficient is 0; when When , the fault interference coefficient increases with the increase of the actual short-circuit current peak avoidance time. When , the corresponding fault interference coefficient is 0, when When , the fault interference coefficient increases with the increase of the actual arc extinguishing chamber insulation strength recovery time. When , the corresponding fault interference coefficient is 0, when When the fault interference coefficient increases with the increase of the actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time, and When , the corresponding fault interference coefficient is 0.

[0038] It is important to understand that when When the corresponding actual short-circuit current peak avoidance time is not less than the reference short-circuit current peak avoidance time or the actual arc extinguishing chamber insulation strength recovery time is not less than the reference arc extinguishing chamber insulation strength recovery time (that is, there is no when When the actual short-circuit current peak avoidance time is used, it also indirectly affects the value of the actual arc extinguishing chamber insulation strength recovery time. For example, during the operation of the transformer, if the short-circuit current peak avoidance time is 1 millisecond, due to the increase in the cutting speed, the damage of the short-circuit current to the arc extinguishing chamber insulation material is reduced, and the insulation material may only take 5 seconds to recover to the insulation strength before the transformer is operated; if the short-circuit current peak avoidance time is 10 milliseconds, due to the decrease in the cutting speed, the damage of the short-circuit current to the insulation material increases, resulting in the insulation material taking a longer time (such as 10 seconds) to recover the insulation strength. Therefore, the actual short-circuit current peak avoidance time is reduced, and the corresponding actual arc extinguishing chamber insulation strength recovery time will also be reduced, thereby shortening the insulation strength recovery time of the transformer insulation material during operation, improving the efficiency of the transformer undervoltage protection, and then realizing the improvement of the short-circuit optimization reliability of the reverse electromotive force in the intelligent undervoltage protection process, effectively solving the problem of low short-circuit optimization reliability of the reverse electromotive force in the intelligent undervoltage protection process in the prior art.

[0039] Furthermore, the specific process for determining the short-circuit fault level of the protected device under the condition of reverse electromotive force is as follows: B1, determine whether the acquired fault interference coefficient is equal to the reference fault interference coefficient. If so, determine it as a level 2 fault, otherwise execute B2; B2, determine whether the acquired fault interference coefficient is less than the reference fault interference coefficient. If so, determine it as a level 1 fault, otherwise determine it as a level 3 fault.

[0040] In this embodiment, the reference fault interference coefficient is represented by the sum and average of the historical fault interference coefficients of the equipment to be protected in the historical time period in a preset database. By directly comparing the fault interference coefficient with the reference fault interference coefficient, the short-circuit fault can be accurately divided into different levels, avoiding the errors caused by subjective judgment. Once the reverse electromotive force is detected and the fault interference coefficient is calculated, the judgment can be made immediately according to the process, which helps to reduce the impact time of the fault on the equipment and system to be protected and improve the efficiency of fault handling.

[0041] Further, such as Figure 2 As shown, it is a flow chart for obtaining the safety protection factor provided in an embodiment of the present application, and the safety protection factor is obtained by the following method: C1, obtaining the actual operating parameters of the capacitor-free non-contact inductive circuit breaker of the device to be protected under a short-circuit fault during the undervoltage protection process, and the actual operating parameters include the actual undervoltage detection sensitivity, the actual intelligent protection response time and the actual controller self-test cycle; C2, judging whether the actual undervoltage detection sensitivity obtained is less than the reference undervoltage detection sensitivity, if so, it indicates that the actual undervoltage detection sensitivity meets the undervoltage detection sensitivity requirement of the undervoltage protection (that is, the actual undervoltage detection sensitivity is less than the reference undervoltage detection sensitivity), otherwise execute C3; C3, judging whether the actual intelligent protection response time obtained is less than the reference intelligent protection response time, if so, it indicates that the actual intelligent protection response time meets the intelligent protection response time requirement of the undervoltage protection. If the actual undervoltage detection sensitivity is less than the reference undervoltage detection sensitivity, the actual intelligent protection response time is less than the reference intelligent protection response time, and the actual controller self-test cycle is greater than the reference controller self-test cycle, then C5 is executed; if the actual undervoltage detection sensitivity is less than the reference undervoltage detection sensitivity, the actual intelligent protection response time is less than the reference intelligent protection response time, and the actual controller self-test cycle is greater than the reference controller self-test cycle, then the safety protection coefficient is recorded as 1, otherwise C6 is executed; C6, the detection sensitivity coefficient, response time coefficient and self-test cycle coefficient are obtained by combining the actual operating parameters and the parameters of the device to be protected, and the addition and exponential operations are performed to obtain the safety protection coefficient;

[0042] In this embodiment, the actual operating parameters are the data of the capacitor-free contactless inductive circuit breaker during the fault operation of the equipment to be protected (i.e., the data corresponding to the end point of the preset time period), which are directly displayed by the capacitor-free contactless inductive circuit breaker (i.e., obtained once at the end of the preset time period); the detection sensitivity coefficient is the ratio of the difference calculation result of the actual pressure loss detection sensitivity and the reference pressure loss detection sensitivity to the reference pressure loss detection sensitivity; the response time coefficient is the complement corresponding to the ratio of the difference calculation result of the actual intelligent protection response time and the reference intelligent protection response time to the reference intelligent protection response time; the self-test cycle coefficient is the complement corresponding to the ratio of the difference calculation result of the actual controller self-test cycle and the reference controller self-test cycle to the reference controller self-test cycle; the parameters of the equipment to be protected are reference values ​​set by preset personnel, including reference mechanical characteristics monitoring cycle, reference discharge detection sensitivity and reference vacuum detection cycle.

[0043] Among them, the reference undervoltage detection sensitivity is represented by the sum and average of the historical minimum undervoltage detection sensitivity displayed on the capacitor-free non-contact inductive circuit breaker in the preset database, the reference intelligent protection response time is represented by the sum and average of the historical minimum undervoltage protection response time displayed on the capacitor-free non-contact inductive circuit breaker in the preset database, the reference controller self-test cycle is represented by the sum and average of the historical maximum controller self-test cycle (such as ten times a day) displayed on the capacitor-free non-contact inductive circuit breaker in the historical time period in the preset database; the reference mechanical characteristic monitoring cycle is represented by the sum and average of the historical mechanical characteristic monitoring cycles of the equipment to be protected in the historical time period in the preset database, the reference discharge detection sensitivity is represented by the sum and average of the historical discharge detection sensitivities of the equipment to be protected in the historical time period in the preset database, and the reference vacuum detection cycle is represented by the sum and average of the historical vacuum detection cycles of the equipment to be protected in the historical time period in the preset database.

[0044] Specifically, recording the safety protection factor as 1 means that the actual undervoltage detection sensitivity, the actual intelligent protection response time and the actual controller self-test cycle have no effect on the undervoltage protection process of the protection device, and the safety protection factor does not need to be calculated at this time; the specific restriction expression of the safety protection factor is:

[0045] ;

[0046] Where t is the number of the preset time period, , T is the total number of preset time periods, e is a natural constant, It indicates the safety protection factor of the equipment to be protected during the voltage loss protection process in the tth preset time period under short circuit fault. It indicates the actual undervoltage detection sensitivity of the equipment to be protected during the undervoltage protection process in the tth preset time period under short circuit fault. Indicates the reference voltage loss detection sensitivity, Indicates the reference controller self-test cycle, It represents the actual controller self-test cycle during the voltage loss protection process of the device to be protected under short-circuit fault within the tth preset time period. It indicates the actual intelligent protection response time of the device to be protected during the voltage loss protection process in the tth preset time period under short circuit fault. Indicates the reference intelligent protection response time.

[0047] Specifically, the simplified expression of the safety protection factor is: , It represents the detection sensitivity coefficient of the device to be protected during the voltage loss protection process in the tth preset time period under short circuit fault. It represents the response time coefficient of the device to be protected during the voltage loss protection process in the tth preset time period under short circuit fault. It represents the self-test cycle coefficient of the device to be protected during the voltage loss protection process in the tth preset time period under a short circuit fault. The statistical table of the change of the safety protection coefficient is shown in Table 1:

[0048] Table 1 Statistics of changes in safety protection coefficients

[0049]

[0050] It should be understood that the safety protection factor increases with the increase of the detection sensitivity factor, the response time factor and the self-test cycle factor. Among them, the detection sensitivity factor increases with the increase of the actual undervoltage detection sensitivity, the response time factor increases with the increase of the actual intelligent protection response time, and the self-test cycle factor increases with the increase of the actual controller self-test cycle. and and When , the corresponding equipment to be protected has the highest level of safety protection during the underpressure protection process.

[0051] It should be noted that the detection sensitivity coefficient also indirectly affects the value of the response time coefficient. When the detection sensitivity increases, it indicates that the system's response rate to the short-circuit fault of the protected equipment increases, thereby shortening the response time, that is, improving the value of the response time coefficient, achieving more accurate identification of the reverse electromotive force, and then achieving improved reliability of short-circuit optimization of the reverse electromotive force in the process of intelligent undervoltage protection, effectively solving the problem of low reliability of short-circuit optimization of the reverse electromotive force in the process of intelligent undervoltage protection in the prior art.

[0052] Furthermore, according to the undervoltage protection parameters, the short-circuit fault is protected against undervoltage protection, and then early warning feedback is included. The undervoltage protection parameters include reference undervoltage detection sensitivity, reference intelligent protection response time and reference controller self-test cycle. The early warning feedback is used to prevent the interlocking operation of the equipment to be protected; the interlocking operation includes shutdown and emergency braking; the specific process of early warning feedback is: real-time monitoring of the voltage waveform and current waveform of the equipment to be protected during the short-circuit fault operation process through an oscilloscope, and real-time monitoring of the changes in the voltage waveform and current waveform within a preset time period to obtain the voltage fluctuation amplitude and the current fluctuation amplitude. The voltage fluctuation amplitude is used to reflect the fluctuation of the voltage of the equipment to be protected within the preset time period, and the current fluctuation amplitude is used to reflect the fluctuation of the current of the equipment to be protected within the preset time period; when the voltage fluctuation amplitude is within the voltage fault threshold range and the current fluctuation amplitude is within the current fault threshold range, the early warning signal is fed back to the operation and maintenance personnel of the equipment to be protected through sound and light alarms, and the early warning signal includes the fault type and fault location.

[0053] In this embodiment, the fault types generally include current overload, voltage overload and leakage of the equipment to be protected. The fault location generally includes the wiring terminals at the power input end of the equipment to be protected and the load connection at the power output end. The voltage fluctuation amplitude and the current fluctuation amplitude are measured in real time by an oscilloscope connected to the equipment to be protected. The voltage fault threshold range is the range corresponding to the historical maximum and minimum voltage values ​​displayed on the oscilloscope during the short-circuit fault operation of the equipment to be protected in the historical time period in the preset database. The current fault threshold range is the range corresponding to the historical maximum and minimum current values ​​displayed on the oscilloscope during the short-circuit fault operation of the equipment to be protected in the historical time period in the preset database. In actual applications, through the early warning feedback of the power equipment before the short-circuit fault occurs, the production interruption caused by the shutdown and emergency braking of the power equipment is avoided, and the timely sending of the early warning signal improves the maintenance efficiency and real-time performance of the operation and maintenance personnel, thereby improving the stability and reliability of the power equipment during the undervoltage protection process.

[0054] Furthermore, the temperature control module includes a temperature control parameter adjustment judgment unit and a module optimization unit; the temperature control parameter adjustment judgment unit: used to judge whether the obtained temperature control parameter evaluation value is within the temperature control evaluation threshold range, if so, the obtained temperature control parameter evaluation value is stored in a preset database, otherwise the temperature control parameter adjustment is performed and the temperature rise change of the equipment to be protected during the temperature control parameter adjustment process is monitored in real time, and the temperature control evaluation threshold range is the range corresponding to the maximum and minimum values ​​of the temperature control parameter evaluation value of the equipment to be protected in the historical operation process in the preset database;

[0055] Module optimization unit: used to optimize module parameters according to the obtained temperature control parameter evaluation values. The module parameters include the interface standards between modules and the modular design redundancy.

[0056] In this embodiment, when the obtained temperature control parameter evaluation value is not within the temperature control evaluation threshold range, it is necessary to increase the coolant flow of the cooling device in the equipment to be protected by increasing the output pressure of the hydraulic pump and to increase the speed of the cooling fan through the variable speed regulator to ensure that the operating temperature of the equipment to be protected returns to the normal range; optimizing the interface standard can improve the compatibility and communication efficiency between modules (such as between the temperature control module and the power generation group); increasing the redundancy of the modular design can improve the reliability and fault tolerance of the system. In the temperature control module, this means that multiple parallel heat dissipation channels can be designed to maintain stable operation of the equipment to be protected when the main channel or component fails.

[0057] In the application field of electric vehicles, the temperature control parameter adjustment judgment unit and the module optimization unit together constitute the intelligent temperature control module in the electric vehicle battery management system. By real-time monitoring, evaluation and adjustment of temperature control parameters, the battery pack is ensured to operate within the set temperature range, thereby improving the performance of the battery pack, extending its service life and ensuring the safety of the vehicle, thereby further improving the efficiency and reliability of the temperature control module.

[0058] Furthermore, the specific steps for obtaining the temperature control parameter evaluation value include: D1, judging whether the starting temperature of the equipment to be protected is lower than the reference starting temperature, if so, executing D2, otherwise not starting the equipment to be protected until the starting temperature is lower than the reference starting temperature; D2, real-time monitoring of the operating temperature of the equipment to be protected during operation within a preset time period and obtaining the cooling efficiency coefficient of the equipment to be protected in combination with the starting temperature, the cooling efficiency coefficient being the ratio of the difference operation result between the operating temperature and the starting temperature to the starting temperature; D3, real-time monitoring of the input vibration amplitude of the equipment to be protected when it starts to operate within a preset time period and the output vibration amplitude when it ends to obtain the vibration isolation efficiency coefficient through a vibration sensor, the vibration isolation efficiency coefficient being the complement of the calculation result of the ratio of the output vibration amplitude to the input vibration amplitude; D4, obtaining the temperature control parameter evaluation value based on the results of addition and exponential operation of the obtained cooling efficiency coefficient and vibration isolation efficiency coefficient and combining with the starting temperature coefficient, the starting temperature coefficient being the complement of the calculation result of the ratio of the starting temperature to the reference starting temperature.

[0059] In this embodiment, the specific limiting expression of the temperature control parameter evaluation value is:

[0060] ;

[0061] Where t is the number of the preset time period, , T is the total number of preset time periods, e is a natural constant, It represents the evaluation value of the temperature control parameter of the equipment to be protected during operation in the tth preset time period. Indicates the starting temperature of the device to be protected when it starts running in the tth preset time period. represents the reference starting temperature, Indicates the operating temperature of the equipment to be protected during the tth preset time period. It indicates the output vibration amplitude of the equipment to be protected when it ends operation within the tth preset time period. Indicates the input vibration amplitude of the equipment to be protected in the tth preset time period.

[0062] Specifically, the temperature sensor on the power connection of the device to be protected is used to measure the starting temperature of the device to be protected before operation within the preset time period and the operating temperature at the end of operation. When the starting temperature (not 0) is not less than the reference starting temperature, it indicates that the temperature of the device to be protected has not dropped below the preset temperature (i.e., below the reference starting temperature) after the end of operation in the previous time period. At this time, the temperature control parameters are not evaluated (i.e., the temperature control parameter evaluation value is not calculated); when When , the statistical table of changes in the temperature control parameter evaluation values ​​is shown in Table 2:

[0063] Table 2 Statistics of changes in temperature control parameter evaluation values

[0064]

[0065] It should be understood that the evaluation value of the temperature control parameter increases with the increase of the vibration isolation efficiency coefficient and the cooling efficiency coefficient, and decreases with the increase of the starting temperature. Among them, the cooling efficiency coefficient increases with the increase of the operating temperature. It should be noted that the operating temperature also affects the value of the output vibration amplitude. For example, in the application scenario of the electric motor of an electric vehicle (used to drive the mechanical equipment in the electric vehicle, the reverse electromotive force of the motor is the voltage generated during deceleration or braking), as the motor runs within a preset time period, the temperature rises, the bearing will increase the gap due to thermal expansion and contraction, resulting in rotational imbalance, thereby increasing the output vibration amplitude of the mechanical equipment connected to the electric motor, affecting the stable operation of the equipment. Therefore, by considering the indirect effect of the operating temperature on the output vibration amplitude, it is helpful to improve the reliability of the short-circuit protection, thereby achieving the improvement of the short-circuit optimization reliability of the reverse electromotive force in the intelligent undervoltage protection process, and effectively solving the problem of low short-circuit optimization reliability of the reverse electromotive force in the intelligent undervoltage protection process in the prior art.

[0066] like Figure 3As shown in the figure, it is a flow chart of the intelligent short-circuit optimization method based on reverse electromotive force provided in the embodiment of the present application. The intelligent short-circuit optimization method based on reverse electromotive force provided in the embodiment of the present application includes the following steps: step one, obtaining the functional data of the device to be protected and identifying the reverse electromotive force of the device to be protected during operation within a preset time period in combination with the non-directional electromotive force sensor, and monitoring the change of the reverse electromotive force within the preset time period in real time to obtain the fault interference coefficient, and the fault interference coefficient is used to judge the short-circuit fault level of the device to be protected when a short-circuit fault occurs under the reverse electromotive force condition; step two, performing undervoltage protection on the short-circuit fault according to the undervoltage protection parameter; Protection, and at the same time, the pressure loss protection process of the equipment to be protected is monitored by a capacitor-free non-contact induction circuit breaker, and the safety protection coefficient is used to reflect the safety protection degree of the short-circuit fault during the pressure loss protection process; step three, monitor the operating status of the equipment to be protected during the pressure loss protection process according to the obtained safety protection coefficient to obtain the temperature control evaluation threshold range; step four, monitor the temperature rise change of the temperature control parameters of the equipment to be protected during operation in real time to obtain the temperature control parameter evaluation value, and at the same time, determine whether to perform the temperature control parameter adjustment according to the temperature control parameter evaluation value and the temperature control evaluation threshold range, and the temperature control parameter evaluation value is used to evaluate the heat dissipation degree of the equipment to be protected during operation.

[0067] The embodiment of the present application provides a device for applying an intelligent short-circuit optimization system based on reverse electromotive force, including: a non-directional electromotive force sensor, a capacitor-free non-contact inductive circuit breaker and a controller; the non-directional electromotive force sensor is used to identify the reverse electromotive force of the equipment to be protected during operation within a preset time period; the capacitor-free non-contact inductive circuit breaker is used to monitor the undervoltage protection process of the equipment to be protected; the controller is used to visualize the detection cycle of the equipment to be protected during the undervoltage protection process.

[0068] In this embodiment, the non-directional electromotive force sensor can accurately identify the reverse electromotive force of the equipment to be protected during its operation within a preset time period; the capacitor-free non-contact induction circuit breaker adopts capacitor-free non-contact induction technology, which can monitor the undervoltage protection process of the equipment to be protected in real time. This technology avoids the aging and failure problems that may be caused by capacitors in traditional circuit breakers, improves the stability and reliability of the system, and ensures the safe operation of the equipment; through the visual interface of the controller, the operation and maintenance personnel can intuitively understand the detection cycle and detection status of the equipment, which is convenient for comprehensive monitoring of the operation of the equipment. This visual design not only improves the operation and maintenance efficiency, but also reduces the risk of human operating errors, and realizes the improvement of the accuracy and real-time performance of short-circuit optimization of reverse electromotive force during intelligent undervoltage protection.

[0069] To summarize, the embodiment of the present application monitors the changes of the reverse electromotive force within a preset time period in real time to obtain the fault interference coefficient, then performs undervoltage protection on the short-circuit fault according to the undervoltage protection parameters to obtain the safety protection coefficient, and finally monitors the temperature rise changes of the equipment to be protected in real time to obtain the temperature control parameter evaluation value, and at the same time, determines whether to perform the temperature control parameter adjustment based on the temperature control parameter evaluation value and the temperature control evaluation threshold range, thereby achieving a more accurate judgment of the temperature control parameter adjustment, and further achieving an improvement in the short-circuit optimization reliability of the reverse electromotive force during the intelligent undervoltage protection process, effectively solving the problem of low short-circuit optimization reliability of the reverse electromotive force during the intelligent undervoltage protection process in the prior art.

[0070] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0071] The present invention is described with reference to the flowcharts and / or block diagrams of the system, the device to be protected (system), and the computer program product according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to be protected to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device to be protected generate the instructions for implementing the process in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0072] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to be protected to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0073] These computer program instructions can also be loaded onto a computer or other programmable data processing device to be protected, so that a series of operating steps are executed on the computer or other programmable data processing device to be protected to produce a computer-implemented process, so that the instructions executed on the computer or other programmable data processing device to be protected provide for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0074] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0075] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. Intelligent short-circuit optimization system based on reverse electromotive force, characterized in that: include: Back electromotive force identification module, intelligent undervoltage protection module, parameter monitoring module of equipment to be protected and temperature control module; The reverse electromotive force identification module is used to obtain the functional data of the equipment to be protected and identify the reverse electromotive force of the equipment to be protected during operation within a preset time period in combination with the non-directional electromotive force sensor, and monitor the change of the reverse electromotive force within the preset time period in real time to obtain the fault interference coefficient, and the fault interference coefficient is used to determine the short-circuit fault level of the equipment to be protected when a short-circuit fault occurs under the reverse electromotive force condition; The intelligent undervoltage protection module is used to perform undervoltage protection on short circuit faults according to undervoltage protection parameters, and monitor the undervoltage protection process of the equipment to be protected through a capacitor-free non-contact induction circuit breaker; The parameter monitoring module of the device to be protected is used to monitor the operating state of the device to be protected during the undervoltage protection process according to the obtained safety protection coefficient to obtain the temperature control evaluation threshold range, and the safety protection coefficient is used to reflect the safety protection degree of the short circuit fault during the undervoltage protection process; The temperature control module is used to monitor the temperature rise change of the temperature control parameters of the equipment to be protected in real time during operation to obtain the temperature control parameter evaluation value, and at the same time determine whether to perform the temperature control parameter adjustment according to the temperature control parameter evaluation value and the temperature control evaluation threshold interval. The temperature control parameter evaluation value is used to evaluate the heat dissipation degree of the equipment to be protected during operation; The steps for obtaining the fault interference coefficient are: A1, obtaining the actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time of the equipment to be protected under a short-circuit fault; A2, judging whether the actual short-circuit current peak avoidance time is less than the reference short-circuit current peak avoidance time, if so, executing A3, otherwise executing A4; A3, judging whether the actual arc extinguishing chamber insulation strength recovery time is less than the reference arc extinguishing chamber insulation strength recovery time, if so, executing A4 as a judgment condition, otherwise directly executing A4; A4, combining the actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time to obtain the fault interference coefficient; The specific limiting expression of the fault interference coefficient is: ； Where t is the number of the preset time period, , T is the total number of preset time periods, e is a natural constant, It represents the fault interference coefficient of the equipment to be protected during operation in the tth preset time period. It represents the reverse electromotive force of the equipment to be protected during operation in the tth preset time period. Indicates the back electromotive force detection threshold range in the non-directional electromotive force sensor, It indicates the actual short-circuit current peak avoidance time during the short-circuit fault operation of the equipment to be protected in the tth preset time period. Indicates the reference short-circuit current peak avoidance time. It indicates the actual arc extinguishing chamber insulation strength recovery time of the protected equipment during the short-circuit fault operation in the tth preset time period. Indicates the reference arc extinguishing chamber insulation strength recovery time; The specific process of determining the short-circuit fault level of the device to be protected when a short-circuit fault occurs under reverse electromotive force is as follows: B1, determine whether the acquired fault interference coefficient is equal to the reference fault interference coefficient. If so, it is determined to be a secondary fault, otherwise execute B2; B2, determine whether the acquired fault interference coefficient is less than the reference fault interference coefficient. If so, it is determined to be a first-level fault, otherwise it is determined to be a third-level fault.

2. The intelligent short-circuit optimization system based on back electromotive force as claimed in claim 1, characterized in that: The functional data includes telemetry data, telesignaling data, remote control data and remote adjustment data; The temperature control parameters include a reference starting temperature, a reference cooling efficiency coefficient and a reference vibration isolation efficiency coefficient; The non-directional electromotive force sensor includes short-circuit avoidance parameters, which include a reverse electromotive force detection threshold interval, a reference short-circuit current peak avoidance time, and a reference arc extinguishing chamber insulation strength recovery time; The reverse electromotive force detection threshold interval is used to determine whether the device to be protected has a short circuit fault; The specific process of determining whether the device to be protected has a short circuit fault is as follows: It is determined whether the reverse electromotive force is within the reverse electromotive force detection threshold range. If so, it indicates that the device to be protected is operating normally, otherwise it indicates that a short circuit fault exists in the device to be protected.

3. The intelligent short-circuit optimization system based on back electromotive force as claimed in claim 1, characterized in that: The safety protection factor is obtained by the following method: C1, obtaining actual operating parameters of the capacitor-free non-contact inductive circuit breaker during the undervoltage protection process of the equipment to be protected under a short-circuit fault, wherein the actual operating parameters include actual undervoltage detection sensitivity, actual intelligent protection response time and actual controller self-test cycle; C2, determine whether the actual pressure loss detection sensitivity obtained is less than the reference pressure loss detection sensitivity. If so, it indicates that the actual pressure loss detection sensitivity meets the pressure loss detection sensitivity requirement of the pressure loss protection. Otherwise, execute C3; C3, judging whether the actual intelligent protection response time obtained is less than the reference intelligent protection response time. If so, it indicates that the actual intelligent protection response time meets the intelligent protection response time requirement of undervoltage protection. Otherwise, C4 is executed. C4, judging whether the obtained actual controller self-test cycle is greater than the reference controller self-test cycle, if so, it indicates that the actual controller self-test cycle meets the controller self-test cycle requirement of the undervoltage protection, otherwise, executing C5; C5: when the actual undervoltage detection sensitivity is less than the reference undervoltage detection sensitivity, the actual intelligent protection response time is less than the reference intelligent protection response time, and the actual controller self-test cycle is greater than the reference controller self-test cycle, the safety protection factor is recorded as 1, otherwise execute C6; C6, combining the actual operating parameters and the parameters of the equipment to be protected to obtain the detection sensitivity coefficient, response time coefficient and self-test cycle coefficient, and performing addition and exponential operations to obtain the safety protection coefficient; The detection sensitivity coefficient is the ratio of the difference calculation result of the actual pressure loss detection sensitivity and the reference pressure loss detection sensitivity to the reference pressure loss detection sensitivity; The response time coefficient is the complement corresponding to the ratio of the difference calculation result of the actual intelligent protection response time and the reference intelligent protection response time to the reference intelligent protection response time; The self-test period coefficient is a complement corresponding to the ratio of the difference calculation result between the actual controller self-test period and the reference controller self-test period to the reference controller self-test period.

4. The intelligent short-circuit optimization system based on back electromotive force as claimed in claim 1, characterized in that: The short circuit fault is protected against undervoltage according to the undervoltage protection parameter, and then an early warning feedback is included, wherein the early warning feedback is used to prevent the interlocking operation of the equipment to be protected; The specific process of the early warning feedback is as follows: The voltage waveform and current waveform of the device to be protected during the short-circuit fault operation are monitored in real time by an oscilloscope, and the changes of the voltage waveform and the current waveform within a preset time period are monitored in real time to obtain the voltage fluctuation amplitude and the current fluctuation amplitude, wherein the voltage fluctuation amplitude is used to reflect the fluctuation of the voltage of the device to be protected within the preset time period, and the current fluctuation amplitude is used to reflect the fluctuation of the current of the device to be protected within the preset time period; When the voltage fluctuation amplitude is within the voltage fault threshold range and the current fluctuation amplitude is within the current fault threshold range, an early warning signal is fed back to the operation and maintenance personnel of the equipment to be protected through sound and light alarms, and the early warning signal includes the fault type and fault location.

5. The intelligent short-circuit optimization system based on reverse electromotive force as claimed in claim 1, characterized in that: The temperature control module includes a temperature control parameter adjustment judgment unit and a module optimization unit; The temperature control parameter adjustment judgment unit is used to judge whether the obtained temperature control parameter evaluation value is within the temperature control evaluation threshold range. If so, the obtained temperature control parameter evaluation value is stored in a preset database; otherwise, the temperature control parameter is adjusted and the temperature rise change of the equipment to be protected is monitored in real time during the temperature control parameter adjustment process; The module optimization unit is used to optimize the module parameters according to the obtained temperature control parameter evaluation values, and the module parameters include the interface standard between modules and the modular design redundancy.

6. The intelligent short-circuit optimization system based on back electromotive force as claimed in claim 1, characterized in that: The specific steps of obtaining the temperature control parameter evaluation value include: D1, determine whether the startup temperature of the device to be protected is lower than the reference startup temperature. If so, execute D2, otherwise, do not start the device to be protected until the startup temperature is lower than the reference startup temperature. D2, real-time monitoring of the operating temperature of the equipment to be protected during operation in a preset time period and obtaining a cooling efficiency coefficient of the equipment to be protected in combination with the startup temperature, wherein the cooling efficiency coefficient is a ratio of a difference calculation result between the operating temperature and the startup temperature to the startup temperature; D3, monitoring the input vibration amplitude of the equipment to be protected at the beginning of operation and the output vibration amplitude at the end of operation in real time within a preset time period through a vibration sensor, and obtaining a vibration isolation efficiency coefficient, wherein the vibration isolation efficiency coefficient is the complement of the calculation result of the ratio of the output vibration amplitude to the input vibration amplitude; D4, obtaining a temperature control parameter evaluation value according to the results of addition and exponential operation of the obtained cooling efficiency coefficient and vibration isolation efficiency coefficient and combining them with the starting temperature coefficient, wherein the starting temperature coefficient is the complement of the calculation result of the ratio of the starting temperature to the reference starting temperature.

7. An intelligent short-circuit optimization method based on reverse electromotive force, characterized in that: The following steps are involved: Step 1, obtaining the functional data of the device to be protected and identifying the reverse electromotive force of the device to be protected during operation within a preset time period in combination with a non-directional electromotive force sensor, and monitoring the change of the reverse electromotive force within the preset time period in real time to obtain a fault interference coefficient, wherein the fault interference coefficient is used to determine the short-circuit fault level of the device to be protected when a short-circuit fault occurs under the reverse electromotive force condition; Step 2: Perform undervoltage protection on the short circuit fault according to the undervoltage protection parameter, and monitor the undervoltage protection process of the equipment to be protected by a capacitor-free non-contact induction circuit breaker; Step three, monitoring the operating state of the equipment to be protected during the undervoltage protection process according to the obtained safety protection coefficient to obtain a temperature control evaluation threshold range, wherein the safety protection coefficient is used to reflect the safety protection degree of the short circuit fault during the undervoltage protection process; Step 4: monitor the temperature rise change of the temperature control parameters of the equipment to be protected in real time during operation to obtain a temperature control parameter evaluation value, and determine whether to perform temperature control parameter adjustment according to the temperature control parameter evaluation value and the temperature control evaluation threshold interval. The temperature control parameter evaluation value is used to evaluate the heat dissipation degree of the equipment to be protected during operation; The steps for obtaining the fault interference coefficient are: A1, obtaining the actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time of the equipment to be protected under a short-circuit fault; A2, judging whether the actual short-circuit current peak avoidance time is less than the reference short-circuit current peak avoidance time, if so, executing A3, otherwise executing A4; A3, judging whether the actual arc extinguishing chamber insulation strength recovery time is less than the reference arc extinguishing chamber insulation strength recovery time, if so, executing A4 as a judgment condition, otherwise directly executing A4; A4, combining the actual short-circuit current peak avoidance time and the actual arc extinguishing chamber insulation strength recovery time to obtain the fault interference coefficient; The specific limiting expression of the fault interference coefficient is: ； Where t is the number of the preset time period, , T is the total number of preset time periods, e is a natural constant, It represents the fault interference coefficient of the equipment to be protected during operation in the tth preset time period. It represents the reverse electromotive force of the equipment to be protected during operation in the tth preset time period. Indicates the back electromotive force detection threshold range in the non-directional electromotive force sensor, It indicates the actual short-circuit current peak avoidance time during the short-circuit fault operation of the equipment to be protected in the tth preset time period. Indicates the reference short-circuit current peak avoidance time. It indicates the actual arc extinguishing chamber insulation strength recovery time of the protected equipment during the short-circuit fault operation in the tth preset time period. Indicates the reference arc extinguishing chamber insulation strength recovery time; The specific process of determining the short-circuit fault level of the device to be protected when a short-circuit fault occurs under reverse electromotive force is as follows: B1, determine whether the acquired fault interference coefficient is equal to the reference fault interference coefficient. If so, it is determined to be a secondary fault, otherwise execute B2; B2, determine whether the acquired fault interference coefficient is less than the reference fault interference coefficient. If so, it is determined to be a first-level fault, otherwise it is determined to be a third-level fault.

8. A device using the intelligent short-circuit optimization system based on reverse electromotive force as claimed in any one of claims 1 to 6, characterized in that: include: Non-directional EMF sensors, capacitor-free non-contact inductive circuit breakers and controllers; The non-directional electromotive force sensor is used to identify the reverse electromotive force of the equipment to be protected during operation within a preset time period; The capacitor-free non-contact induction circuit breaker is used to monitor the voltage loss protection process of the equipment to be protected; The controller is used to visualize the detection cycle of the device to be protected during the undervoltage protection process.

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