Short-circuit current standard exceeding early warning method, device and equipment for alternating current and direct current power grid and medium

Abstract

The invention discloses a short-circuit current standard exceeding early warning method, device and equipment for an AC-DC power grid and a medium, and relates to the technical field of intelligent power grids, and the method comprises the steps: dividing the AC-DC power grid based on a topological structure of the power grid, carrying out the equivalent construction of each obtained sub-region through the key information of each key node in the AC-DC power grid, and obtaining a short-circuit current standard exceeding early warning result; performing parallel calculation on the short-circuit current of each sub-region based on a power grid parallel calculation framework constructed by the obtained regional electrical equivalence model, a graph calculation model and a multi-thread technology; determining a first short-circuit current standard-exceeding threshold value of each sub-region based on historical operation data of the power grid, and comparing each short-circuit current calculation result in the parallel calculation result with the first short-circuit current standard-exceeding threshold value to judge whether the short-circuit current exceeds the standard or not; and performing multi-criterion fusion on the judgment result through the environment temperature coefficient, and if the fusion result is lower than a second short-circuit current standard-exceeding threshold value, triggering short-circuit current standard-exceeding early warning. The early warning capability of the short-circuit fault of the power grid is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of smart grids, and in particular to a method, device, equipment and medium for early warning of excessive short-circuit current in an AC / DC grid. Background Art

[0002] With the rapid development of AC and DC power grids, power systems are becoming more and more complex, especially the operating modes and topological structures of AC and DC hybrid systems are becoming more diversified. Therefore, the stability and safety of the power grid have become particularly important. Short-circuit faults are one of the most common and most harmful types of faults in power systems. They can cause large-scale power outages and may even cause serious damage to power equipment. Being able to timely and accurately warn of excessive short-circuit currents is crucial to the safe operation of the power grid.

[0003] At present, the traditional short-circuit current calculation method is generally based on the overall modeling of the entire network, using the traditional series impedance method or the node voltage method to calculate the current. However, with the increase in the scale and complexity of the power grid, the traditional calculation method often has shortcomings such as long calculation time and large amount of calculation, and cannot meet the needs of real-time monitoring and rapid early warning. Especially in AC / DC hybrid power grids, the interconnection between AC and DC systems makes the calculation of short-circuit current more complicated, and a single calculation method is often difficult to cope with the changing power grid conditions.

[0004] As can be seen from the above, how to quickly and accurately calculate the short-circuit current in complex AC and DC power grids to improve the early warning capability of power grid short-circuit faults is a problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method, device, equipment and medium for early warning of short-circuit current exceeding the standard in AC / DC power grids, which can quickly and accurately calculate the short-circuit current in complex AC / DC power grids to improve the early warning capability of power grid short-circuit faults. The specific scheme is as follows:

[0006] In a first aspect, the present application provides a short-circuit current exceeding standard warning method for an AC / DC power grid, comprising:

[0007] Using a preset monitoring tool to collect key information of each key node in the AC / DC power grid, then dividing the AC / DC power grid based on the topological structure of the power grid, and using the key information to perform equivalent construction on each sub-area obtained to obtain a regional electrical equivalent model;

[0008] Using the regional electrical equivalent model to construct a power grid parallel computing framework, so as to perform parallel computing on the short-circuit current of each sub-region based on the power grid parallel computing framework, the graph computing model and the multi-threading technology, so as to obtain the corresponding parallel computing results;

[0009] Determine a first short-circuit current exceeding threshold value corresponding to each of the sub-areas based on the historical operation data of the power grid, compare each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judge whether the short-circuit current exceeds the standard through the comparison result to obtain a judgment result;

[0010] The ambient temperature coefficient is determined by the current ambient temperature of the operating area of ​​the AC / DC power grid, so as to perform multi-criteria fusion on the judgment result based on the ambient temperature coefficient. If the fusion result is lower than the second short-circuit current exceeding threshold, a short-circuit current exceeding warning is triggered.

[0011] Optionally, the collecting key information of each key node in the AC / DC power grid by using a preset monitoring tool includes:

[0012] Using current sensors in a preset monitoring tool to collect the amplitude and waveform of the AC current and DC current at each key node in the AC / DC power grid and the frequency of the AC current;

[0013] Collecting load change data of load equipment at each key node in the AC / DC power grid based on load sensors in a preset monitoring tool;

[0014] Obtain key information using the amplitude and waveform of the AC current and DC current at each key node, the frequency of the AC current, and the load change data of the load device;

[0015] The key nodes include transformer substations, distribution rooms, busbars, switchgear, load equipment, conversion stations in DC transmission systems, inverters, and junctions between AC and DC power grids.

[0016] Optionally, the AC and DC power grids are divided based on the topological structure of the power grid, and each sub-region obtained is equivalently constructed using the key information to obtain a regional electrical equivalent model, including:

[0017] Based on the topological structure of the power grid and using a preset connection relationship, the AC and DC power grid is divided to obtain sub-areas;

[0018] An RLC circuit model is constructed by using loads and electrical equipment in the AC / DC power grid, and circuit parameters in the RLC circuit model are adjusted using the key information to obtain a regional electrical equivalent model.

[0019] Optionally, the use of the regional electrical equivalent model to construct a power grid parallel computing framework to perform parallel computing on the short-circuit current of each of the sub-regions based on the power grid parallel computing framework, the graph computing model and the multi-threading technology to obtain corresponding parallel computing results includes:

[0020] A power grid parallel computing framework is constructed using the regional electrical equivalent model of each sub-region and a distributed computing architecture to determine the electrical equivalent impedance of each sub-region based on the regional electrical equivalent model and multi-threading technology in the power grid parallel computing framework;

[0021] Determine each short-circuit current calculation result by using the power supply voltage of each sub-area and the electrical equivalent impedance;

[0022] Connecting the sub-regions and the key nodes by edges through a graph computing model to obtain a power grid diagram for characterizing the electrical connection relationship between the sub-regions in the AC / DC power grid, and determining the propagation path of the short-circuit current by using the Dijkstra algorithm and the power grid diagram;

[0023] The parallel calculation results are obtained by using the short-circuit current calculation results and the propagation paths.

[0024] Optionally, after performing parallel calculation on the short-circuit current of each of the sub-areas based on the power grid parallel calculation framework, the graph calculation model and the multi-threading technology to obtain the corresponding parallel calculation results, the method further includes:

[0025] The parallel calculation results are synchronized to a central processing platform based on a communication link, so that the parallel calculation results are integrated and analyzed by the central processing platform, and the overall short-circuit state diagram of the AC / DC power grid is updated using the analysis results.

[0026] Optionally, determining a first short-circuit current exceeding threshold value corresponding to each of the sub-areas based on the historical operation data of the power grid, comparing each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judging whether the short-circuit current exceeds the standard through the comparison result to obtain a judgment result, includes:

[0027] Determine the average amplitude of the current when a short circuit occurs in the AC / DC power grid based on the historical operation data of the power grid to obtain an average value of the short-circuit current, and determine the degree of change of the short-circuit current when a short circuit occurs in the AC / DC power grid through the historical operation data of the power grid to obtain a standard deviation of the short-circuit current;

[0028] Determine a first short-circuit current exceeding threshold value corresponding to each of the sub-regions by using the short-circuit current average value and the short-circuit current standard deviation, and compare each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value;

[0029] If any short-circuit current value in each of the short-circuit current calculation results is greater than the corresponding first short-circuit current exceeding threshold, a judgment result of short-circuit current exceeding the standard is obtained.

[0030] Optionally, the determining of the ambient temperature coefficient by the current ambient temperature of the operating area of ​​the AC / DC power grid, and performing multi-criteria fusion on the judgment result based on the ambient temperature coefficient, and triggering a short-circuit current exceeding threshold value if the fusion result is lower than a second short-circuit current exceeding threshold value, includes:

[0031] An ambient temperature coefficient is determined based on the current ambient temperature of the operating area of ​​the AC / DC power grid and the resistance temperature variation coefficient, and the judgment result of the short-circuit current exceeding the standard is subjected to multi-criteria fusion using the ambient temperature coefficient to obtain a fusion result; the resistance temperature variation coefficient is a coefficient of the conductor resistivity changing with temperature;

[0032] If the fusion result is greater than or equal to the second short-circuit current exceeding threshold, the judgment result of the short-circuit current exceeding the standard is modified to a short-circuit current misjudgment;

[0033] If the fusion result is lower than the second short-circuit current exceeding standard threshold, a short-circuit current exceeding standard warning is triggered.

[0034] In a second aspect, the present application provides an AC / DC power grid short-circuit current excessive warning device, comprising:

[0035] An equivalent model construction module is used to collect key information of each key node in the AC / DC power grid using a preset monitoring tool, then divide the AC / DC power grid based on the topological structure of the power grid, and use the key information to perform equivalent construction on each sub-region obtained to obtain a regional electrical equivalent model;

[0036] A short-circuit current parallel calculation module is used to construct a power grid parallel calculation framework using the regional electrical equivalent model, so as to perform parallel calculation on the short-circuit current of each sub-region based on the power grid parallel calculation framework, the graph calculation model and the multi-threading technology, so as to obtain the corresponding parallel calculation results;

[0037] A calculation result comparison module, used for determining a first short-circuit current exceeding threshold value corresponding to each of the sub-areas based on the historical operation data of the power grid, comparing each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judging whether the short-circuit current exceeds the standard through the comparison result, so as to obtain a judgment result;

[0038] The judgment result correction module is used to determine the ambient temperature coefficient according to the current ambient temperature of the operating area of ​​the AC / DC power grid, so as to perform multi-criteria fusion on the judgment result based on the ambient temperature coefficient, and trigger a short-circuit current exceeding threshold value if the fusion result is lower than the second short-circuit current exceeding threshold value.

[0039] In a third aspect, the present application provides an electronic device, including:

[0040] Memory, used to store computer programs;

[0041] The processor is used to execute the computer program to implement the above-mentioned short-circuit current exceeding standard warning method for AC and DC power grids.

[0042] In a fourth aspect, the present application provides a computer-readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the aforementioned short-circuit current excessive warning method for AC and DC power grids.

[0043] The present application uses a preset monitoring tool to collect key information of each key node in the AC / DC power grid, then divides the AC / DC power grid based on the topological structure of the power grid, and uses the key information to perform equivalent construction on each obtained sub-region to obtain a regional electrical equivalent model; uses the regional electrical equivalent model to construct a power grid parallel computing framework, so as to perform parallel calculation of the short-circuit current of each sub-region based on the power grid parallel computing framework, graph computing model and multi-threading technology to obtain corresponding parallel computing results; determines the first short-circuit current exceeding threshold value corresponding to each sub-region based on the historical operation data of the power grid, compares each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judges whether the short-circuit current exceeds the standard through the comparison result to obtain a judgment result; determines the ambient temperature coefficient through the current ambient temperature of the operating area of ​​the AC / DC power grid, so as to perform multi-criteria fusion on the judgment result based on the ambient temperature coefficient, and triggers a short-circuit current exceeding warning if the fusion result is lower than the second short-circuit current exceeding threshold value.

[0044] As can be seen from the above, the present application divides the AC / DC power grid into several sub-areas, uses a regional electrical equivalent model constructed based on the key information of each key node in the AC / DC power grid, and combines the graph calculation model and multi-threading technology to quickly and parallelly calculate the short-circuit current of each sub-area, which greatly improves the real-time and accuracy of the short-circuit current calculation; based on the historical operation data of the power grid, the first short-circuit current exceeding threshold corresponding to each sub-area is determined, and by comparing the short-circuit current calculation results of each sub-area in the AC / DC power grid with the corresponding first short-circuit current exceeding threshold, it can accurately determine whether the short-circuit current exceeds the standard, and use the current ambient temperature of the operating area of ​​the AC / DC power grid to determine the ambient temperature coefficient. In this way, the judgment result is integrated with multiple criteria using the ambient temperature coefficient, which improves the accuracy of the judgment result and greatly reduces the situation of misjudgment, thereby improving the accuracy of the early warning and the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0046] Figure 1 A flow chart of a short-circuit current exceeding standard warning method for an AC / DC power grid disclosed in the present application;

[0047] Figure 2 This is a schematic diagram of the structure of a short-circuit current exceeding standard warning device for an AC / DC power grid disclosed in the present application;

[0048] Figure 3 This is a structural diagram of an electronic device disclosed in this application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] With the increase in the scale and complexity of power grids, traditional short-circuit current calculation methods are generally based on the overall modeling of the entire network, using traditional series impedance methods or node voltage-based methods to calculate current. However, they can no longer meet the needs of real-time monitoring and rapid early warning, and have disadvantages such as long calculation time and large amount of calculation. Especially in AC / DC hybrid power grids, the interconnection between AC and DC systems makes the calculation of short-circuit current more complicated. To this end, the present application provides an AC / DC power grid short-circuit current excessive early warning method, which uses the ambient temperature coefficient to fuse multiple criteria for the judgment results, improves the accuracy of the judgment results, and greatly reduces the situation of misjudgment, thereby improving the accuracy of the early warning and the safety of the system.

[0051] See also Figure 1 As shown, an embodiment of the present invention discloses a short-circuit current exceeding standard warning method for an AC / DC power grid, comprising:

[0052] Step S11, using a preset monitoring tool to collect key information of each key node in the AC / DC power grid, then dividing the AC / DC power grid based on the topological structure of the power grid, and using the key information to perform equivalent construction on each sub-area obtained to obtain a regional electrical equivalent model.

[0053] In this embodiment, the current sensor in the preset monitoring tool is used to collect the instantaneous amplitude and waveform of the AC current and DC current of each key node in the AC / DC power grid, as well as the frequency of the AC current, and then the load sensor is used to monitor the load change data of each load device at each key node in the AC / DC power grid, so as to obtain key information based on the amplitude and waveform, the frequency of the AC current, and the load change data of the load device. Specifically, the key information of each key node in the AC / DC power grid is collected by using the preset monitoring tool, including: collecting the amplitude and waveform of the AC current and DC current of each key node in the AC / DC power grid and the frequency of the AC current by using the current sensor in the preset monitoring tool; collecting the load change data of the load device of each key node in the AC / DC power grid based on the load sensor in the preset monitoring tool; obtaining key information by using the amplitude and waveform of the AC current and DC current of each key node, the frequency of the AC current, and the load change data of the load device; wherein the key nodes include substations, distribution rooms, busbars, switchgear, load devices, conversion stations in DC power transmission systems, inverters, and junctions of AC / DC power grids.

[0054] It can be understood that the current sensor in the preset monitoring tool is used to collect the instantaneous amplitudes of the AC current and DC current of each key node in the AC / DC power grid, wherein the amplitude calculation formula of the AC current is as follows:

[0055] ;

[0056] in, is the instantaneous amplitude of the alternating current changing with time; is the instantaneous amplitude of the voltage associated with the alternating current. The amplitude calculation formula of the direct current is as follows:

[0057] ;

[0058] in, is the DC voltage; is the equivalent resistance of direct current. The frequency calculation formula of the alternating current is as follows:

[0059] ;

[0060] in, is the instantaneous amplitude of the alternating current changing with time; Indicates a small increment; is the Fourier transform kernel function in complex exponential form.

[0061] In a specific implementation, a load current relationship model for characterizing the corresponding relationship between load fluctuation and current waveform is constructed based on the load change data. The load current relationship model can be expressed as:

[0062] ;

[0063] in, is the load change data; The load current relationship model can be used to better understand the impact of load fluctuations on the current waveform, so as to predict and simulate the changes of load current under different conditions.

[0064] In this embodiment, after obtaining the key information, the AC / DC power grid is divided into several sub-areas based on the topological structure of the power grid and according to the connection relationship between the substation, the distribution room, the busbar, and the power line, and then the electrical behavior characteristics of the sub-area are derived using the waveform of the AC current in the key information, such as whether the waveform is a sine wave or close to a sine wave; if the electrical behavior characteristics meet the preset characteristic conditions, an RLC circuit model including resistance, inductance and capacitance is constructed in the sub-area based on the load and electrical equipment in the AC / DC power grid, and the circuit parameters of the RLC circuit model are adjusted using the key information and the load current relationship model to obtain a regional electrical equivalent model; wherein each sub-area is independently connected by electrical equipment (such as switches, circuit breakers, transformers).

[0065] Specifically, the AC / DC power grid is divided based on the topological structure of the power grid, and each sub-region obtained is constructed equivalently using the key information to obtain a regional electrical equivalent model, including: based on the topological structure of the power grid and using a preset connection relationship, the AC / DC power grid is divided to obtain each sub-region; an RLC circuit model is constructed through loads and electrical equipment in the AC / DC power grid, and circuit parameters in the RLC circuit model are adjusted using the key information to obtain a regional electrical equivalent model.

[0066] It can be understood that for each sub-area, the load and electrical equipment are simplified to an RLC circuit, and the regional electrical equivalent model is expressed as:

[0067] ;

[0068] in, is the electrical equivalent impedance of the ith sub-region; is the frequency of the alternating current. Then, the load fluctuation coefficient is determined based on the load change data in the key data and the load current relationship model, so as to adjust the input current in the RLC circuit model based on the load fluctuation coefficient. The adjusted current is expressed as follows:

[0069] ;

[0070] in, is the unadjusted initial current; is the load fluctuation coefficient. The input current in the RLC circuit model is adjusted to obtain a regional electrical equivalent model.

[0071] Step S12: construct a power grid parallel computing framework using the regional electrical equivalent model, and perform parallel computing on the short-circuit current of each sub-region based on the power grid parallel computing framework, graph computing model and multi-threading technology to obtain corresponding parallel computing results.

[0072] In this embodiment, the regional electrical equivalent model and the distributed computing architecture are used to construct a power grid parallel computing framework, and the short-circuit current in the AC / DC power grid is calculated in real time based on the regional electrical equivalent model in the power grid parallel computing framework, and the calculation process is accelerated by multi-threading technology to determine the electrical equivalent impedance of each sub-region, and then the power supply voltage of each sub-region and the electrical equivalent impedance are used to determine the calculation results of each short-circuit current, and the sub-regions and the key nodes are connected by edges through a graph computing model to obtain a power grid diagram for characterizing the electrical connection relationship between the sub-regions in the AC / DC power grid, and the Dijkstra algorithm of the graph computing model and the power grid diagram are used to determine the propagation path of the short-circuit current, so as to obtain a parallel calculation result using the short-circuit current calculation results and the propagation path.

[0073] Specifically, the method of constructing a power grid parallel computing framework using the regional electrical equivalent model to perform parallel computing of the short-circuit current of each sub-region based on the power grid parallel computing framework, the graph computing model and the multi-threading technology to obtain the corresponding parallel computing results includes: constructing a power grid parallel computing framework using the regional electrical equivalent model of each sub-region and the distributed computing architecture to determine the electrical equivalent impedance of each sub-region based on the regional electrical equivalent model and the multi-threading technology in the power grid parallel computing framework; determining each short-circuit current calculation result using the power supply voltage of each sub-region and the electrical equivalent impedance; connecting each sub-region and each key node by edges through the graph computing model to obtain a power grid diagram for characterizing the electrical connection relationship between each sub-region in the AC / DC power grid, and determining the propagation path of the short-circuit current using the Dijkstra algorithm and the power grid diagram; and obtaining the parallel computing result using each short-circuit current calculation result and the propagation path.

[0074] It can be understood that the regional electrical equivalent model and the distributed computing architecture are used to construct a power grid parallel computing framework, which is expressed as:

[0075] ;

[0076] in, is the total short-circuit current in the AC / DC power grid; The electrical equivalent impedance of each sub-region is determined based on the regional electrical equivalent model and multi-threading technology in the parallel computing framework of the power grid. Afterwards, the power supply voltage of each sub-region and the electrical equivalent impedance are used to determine the calculation results of each short-circuit current, and the calculation formula is as follows:

[0077] ;

[0078] in, is the short-circuit current of the ith sub-region; is the power supply voltage of the i-th sub-region; is the electrical equivalent impedance of the sub-region.

[0079] In this embodiment, the sub-areas and the key nodes are connected by edges through a graph computing model to model based on the connection relationship to form a multi-level, multi-node power grid diagram. In a specific implementation, the AC / DC power grid is divided into N sub-areas, and each sub-area i and its key node are connected by edges to represent the electrical connection relationship, and a power grid diagram G is defined: , where V is the set of key nodes, each of which represents a sub-region, and E is the set of all edges, indicating the electrical connection relationship between different key nodes. The key nodes i and j of the connection represent the electrical connection relationship. The weight of the power grid diagram is defined by the electrical equivalent impedance, and the formula is as follows:

[0080] ;

[0081] in, and are the resistance and inductance of the electrical connection from key node i to key node j, respectively; is the frequency of the alternating current.

[0082] Furthermore, after obtaining the power grid diagram, the starting point of the current is calculated using the Dijkstra algorithm based on the diagram calculation model. The shortest path to other key nodes is the propagation path of the short-circuit current. The propagation path calculation formula is as follows:

[0083] ;

[0084] in, It is the propagation path of the short-circuit current; is the power grid diagram; After the propagation path is determined, a parallel calculation result is obtained based on each of the short-circuit current calculation results and the propagation path.

[0085] In this embodiment, after obtaining the parallel calculation results, the parallel calculation results are synchronized to the central processing platform based on a communication link, and the communication link can be a high-speed network connection, such as Ethernet, optical fiber, etc.; after receiving the parallel calculation results through the central processing platform, the parallel calculation results will be immediately parsed and processed to update the overall short-circuit state diagram of the AC / DC power grid in real time based on the processed data obtained. Specifically, after the short-circuit current of each sub-area is calculated in parallel based on the parallel calculation framework of the power grid, the graph calculation model and the multi-threading technology to obtain the corresponding parallel calculation results, it also includes: synchronizing the parallel calculation results to the central processing platform based on the communication link, so as to integrate and analyze the parallel calculation results through the central processing platform, and using the analysis results to update the overall short-circuit state diagram of the AC / DC power grid.

[0086] Step S13, determining the first short-circuit current exceeding threshold value corresponding to each of the sub-areas based on the historical operation data of the power grid, comparing each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judging whether the short-circuit current exceeds the standard through the comparison result to obtain a judgment result.

[0087] In this embodiment, after obtaining the parallel calculation results, the short-circuit current average value is determined based on the mean value of the short-circuit current in the historical operation data of the power grid, and then the short-circuit current standard deviation is determined by the degree of change of the short-circuit current in the historical operation data of the power grid, so as to use the short-circuit current average value and the short-circuit current standard deviation to determine the first short-circuit current exceeding threshold value corresponding to each of the sub-areas, so as to use each short-circuit current calculation result in the parallel calculation results to compare with the corresponding first short-circuit current exceeding threshold value, if any short-circuit current value in each of the short-circuit current calculation results is greater than the corresponding first short-circuit current exceeding threshold value, a judgment result of short-circuit current exceeding is obtained, and the short-circuit current exceeding warning is not triggered at this time.

[0088] Specifically, the first short-circuit current exceeding standard threshold value corresponding to each of the sub-areas is determined based on the historical operation data of the power grid, each short-circuit current calculation result in the parallel calculation result is compared with the corresponding first short-circuit current exceeding standard threshold value, and whether the short-circuit current exceeds the standard is judged by the comparison result to obtain a judgment result, including: determining the average amplitude of the current when a short circuit occurs in the AC / DC power grid based on the historical operation data of the power grid to obtain the short-circuit current average value, and determining the degree of change of the short-circuit current when a short circuit occurs in the AC / DC power grid through the historical operation data of the power grid to obtain the short-circuit current standard deviation; using the short-circuit current average value and the short-circuit current standard deviation to determine the first short-circuit current exceeding standard threshold value corresponding to each of the sub-areas, and comparing each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding standard threshold value; if any short-circuit current value in each of the short-circuit current calculation results is greater than the corresponding first short-circuit current exceeding standard threshold value, a judgment result of short-circuit current exceeding standard is obtained.

[0089] It can be understood that the first short-circuit current exceeding standard threshold corresponding to each of the sub-areas is determined by using the short-circuit current average value and the short-circuit current standard deviation, and the calculation formula of the first short-circuit current exceeding standard threshold is as follows:

[0090] ;

[0091] in, is the first short-circuit current exceeding standard threshold; is the average short-circuit current, which indicates the average current amplitude when a short-circuit event occurs in the power grid in the past period of time; is the safety factor, a constant greater than 1, which is used to ensure that the power grid will not exceed the standard under normal load fluctuations. , used to ensure that the current value is within the 95% confidence interval, the safety factor It can also be adjusted accordingly according to the actual situation; is the short-circuit current standard deviation, which indicates the degree of change of the short-circuit current when a short circuit occurs in the AC / DC power grid.

[0092] Step S14, determining an ambient temperature coefficient by the current ambient temperature of the operating area of ​​the AC / DC power grid, and performing multi-criteria fusion on the judgment result based on the ambient temperature coefficient; if the fusion result is lower than a second short-circuit current exceeding threshold, a short-circuit current exceeding warning is triggered.

[0093] In this embodiment, after obtaining a judgment result of short-circuit current exceeding the standard by comparing each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding standard threshold, the ambient temperature coefficient is determined using the current ambient temperature of the operating area of ​​the AC / DC power grid and the resistance temperature change coefficient, so as to perform multi-criteria fusion on the judgment result based on the ambient temperature coefficient. If the obtained fusion result is greater than or equal to the second short-circuit current exceeding standard threshold, the judgment result of the short-circuit current exceeding standard is modified to a short-circuit current misjudgment; if the fusion result is lower than the second short-circuit current exceeding standard threshold, a short-circuit current exceeding standard warning is triggered.

[0094] Specifically, the ambient temperature coefficient is determined by the current ambient temperature of the operating area of ​​the AC / DC power grid, and the judgment result is subjected to multi-criteria fusion based on the ambient temperature coefficient. If the fusion result is lower than the second short-circuit current exceeding threshold, a short-circuit current exceeding warning is triggered, including: determining the ambient temperature coefficient based on the current ambient temperature of the operating area of ​​the AC / DC power grid and the resistance temperature variation coefficient, and using the ambient temperature coefficient to perform multi-criteria fusion on the judgment result of the short-circuit current exceeding to obtain a fusion result; the resistance temperature variation coefficient is a coefficient of the conductor resistivity changing with temperature; if the fusion result is greater than or equal to the second short-circuit current exceeding threshold, the judgment result of the short-circuit current exceeding is modified to a short-circuit current misjudgment; if the fusion result is lower than the second short-circuit current exceeding threshold, a short-circuit current exceeding warning is triggered.

[0095] It can be understood that the ambient temperature coefficient is determined by using the current ambient temperature of the operating area of ​​the AC / DC power grid and the resistance temperature variation coefficient. The calculation formula of the ambient temperature coefficient is as follows:

[0096] ;

[0097] in, is the coefficient of resistance change due to temperature, which depends on the temperature characteristics of the conductor material; is the current ambient temperature of the operating area of ​​the AC / DC power grid; In a specific implementation, in the power grid scenario, the conductor material used is mainly copper, so the copper value, ; After normalization Take 0.39; the reference temperature can be set to 20°C. Therefore, the obtained ambient temperature coefficient The value of is normalized to [0, 1]. It is worth mentioning that and Specific adjustments can be made based on actual conditions.

[0098] Furthermore, the environmental temperature coefficient is used to perform multi-criteria fusion on the judgment result to obtain a final fusion result. The fusion result is , then the multi-criteria fusion formula is as follows:

[0099] ;

[0100] in, is the ambient temperature coefficient; if the judgment result is that the short-circuit current exceeds the standard, then Take 1; if the judgment result is that the short-circuit current does not exceed the standard, then Take 0. Use the ambient temperature coefficient to perform multi-criteria fusion on the judgment result of short-circuit current exceeding the standard. If the fusion result is If the fusion result is greater than or equal to the second short-circuit current exceeding threshold, the judgment result of short-circuit current exceeding is modified to short-circuit current misjudgment; if the fusion result is less than the second short-circuit current exceeding threshold, the short-circuit current exceeding is confirmed and a short-circuit current exceeding warning is triggered. It is worth mentioning that the second short-circuit current exceeding threshold can be adjusted accordingly according to actual conditions and is not specifically limited here.

[0101] In a specific embodiment, When the value is 1, the judgment result is that the short-circuit current exceeds the standard. If the ambient temperature coefficient at this time When it is greater than or equal to 0.5, it proves that the ambient temperature corresponding to the current AC / DC power grid is too high, and the judgment result is greatly affected by the high temperature. Therefore, the judgment result of the short-circuit current exceeding the standard is likely to be a misjudgment. When it is less than 0.5, it proves that the judgment result is less affected by high temperature, so the judgment result of short-circuit current exceeding the standard is likely to be a correct judgment result. It can also be understood as follows: if the judgment result indicates that the short-circuit current exceeds the standard, it is determined whether the ambient temperature coefficient is greater than or equal to 0.5; if the ambient temperature coefficient is greater than or equal to 0.5, the judgment result of short-circuit current exceeding the standard is modified to short-circuit current misjudgment; if the ambient temperature coefficient is lower than 0.5, a short-circuit current exceeding standard warning is triggered.

[0102] As can be seen from the above, the present application divides the AC / DC power grid into several sub-areas, uses a regional electrical equivalent model constructed based on the key information of each key node in the AC / DC power grid, and combines the graph calculation model and multi-threading technology to quickly and parallelly calculate the short-circuit current of each sub-area, which greatly improves the real-time and accuracy of the short-circuit current calculation; based on the historical operation data of the power grid, the first short-circuit current exceeding threshold corresponding to each sub-area is determined, and by comparing the short-circuit current calculation results of each sub-area in the AC / DC power grid with the corresponding first short-circuit current exceeding threshold, it can accurately determine whether the short-circuit current exceeds the standard, and use the current ambient temperature of the operating area of ​​the AC / DC power grid to determine the ambient temperature coefficient. In this way, the judgment result is integrated with multiple criteria using the ambient temperature coefficient, which improves the accuracy of the judgment result and greatly reduces the situation of misjudgment, thereby improving the accuracy of the early warning and the safety of the system.

[0103] Accordingly, see Figure 2 As shown, the present application also provides an AC / DC power grid short-circuit current exceeding standard warning device, comprising:

[0104] The equivalent model construction module 11 is used to collect key information of each key node in the AC / DC power grid using a preset monitoring tool, then divide the AC / DC power grid based on the topological structure of the power grid, and use the key information to perform equivalent construction on each sub-region obtained to obtain a regional electrical equivalent model;

[0105] The short-circuit current parallel calculation module 12 is used to construct a power grid parallel calculation framework using the regional electrical equivalent model, so as to perform parallel calculation on the short-circuit current of each sub-region based on the power grid parallel calculation framework, the graph calculation model and the multi-threading technology, so as to obtain the corresponding parallel calculation results;

[0106] A calculation result comparison module 13 is used to determine the first short-circuit current exceeding threshold value corresponding to each of the sub-areas based on the historical operation data of the power grid, compare each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judge whether the short-circuit current exceeds the standard through the comparison result to obtain a judgment result;

[0107] The judgment result fusion module 14 is used to determine the ambient temperature coefficient according to the current ambient temperature of the operating area of ​​the AC / DC power grid, so as to perform multi-criteria fusion on the judgment result based on the ambient temperature coefficient, and trigger a short-circuit current exceeding threshold value if the fusion result is lower than the second short-circuit current exceeding threshold value.

[0108] As can be seen from the above, the present application divides the AC / DC power grid into several sub-areas, uses a regional electrical equivalent model constructed based on the key information of each key node in the AC / DC power grid, and combines the graph calculation model and multi-threading technology to quickly and parallelly calculate the short-circuit current of each sub-area, which greatly improves the real-time and accuracy of the short-circuit current calculation; based on the historical operation data of the power grid, the first short-circuit current exceeding threshold corresponding to each sub-area is determined, and by comparing the short-circuit current calculation results of each sub-area in the AC / DC power grid with the corresponding first short-circuit current exceeding threshold, it can accurately determine whether the short-circuit current exceeds the standard, and use the current ambient temperature of the operating area of ​​the AC / DC power grid to determine the ambient temperature coefficient. In this way, the judgment result is integrated with multiple criteria using the ambient temperature coefficient, which improves the accuracy of the judgment result and greatly reduces the situation of misjudgment, thereby improving the accuracy of the early warning and the safety of the system.

[0109] In some specific implementations, the equivalent model building module 11 may specifically include:

[0110] A current frequency acquisition unit, used to collect the amplitude and waveform of the AC current and DC current of each key node in the AC / DC power grid and the frequency of the AC current using a current sensor in a preset monitoring tool;

[0111] A load change data acquisition unit, used to collect load change data of load devices at each key node in the AC / DC power grid based on a load sensor in a preset monitoring tool;

[0112] The key information acquisition unit is used to obtain key information by using the amplitude and waveform of the AC current and DC current of each key node, the frequency of the AC current and the load change data of the load equipment.

[0113] In some specific implementations, the equivalent model building module 11 may specifically include:

[0114] A power grid division unit, used for dividing the AC and DC power grid based on the topological structure of the power grid and using a preset connection relationship to obtain sub-areas;

[0115] The circuit model building unit is used to build an RLC circuit model through the loads and electrical equipment in the AC and DC power grid, and adjust the circuit parameters in the RLC circuit model using the key information to obtain a regional electrical equivalent model.

[0116] In some specific implementations, the short-circuit current parallel calculation module 12 may specifically include:

[0117] A computing framework construction unit, configured to construct a power grid parallel computing framework by using the regional electrical equivalent model of each sub-region and a distributed computing architecture, so as to determine the electrical equivalent impedance of each sub-region based on the regional electrical equivalent model and multi-threading technology in the power grid parallel computing framework;

[0118] A current calculation result determination unit, configured to determine each short-circuit current calculation result using the power supply voltage of each sub-region and the electrical equivalent impedance;

[0119] A power grid diagram construction unit, used for edge-connecting each of the sub-areas and each of the key nodes through a graph calculation model to obtain a power grid diagram for characterizing the electrical connection relationship between each of the sub-areas in the AC / DC power grid, and determining a propagation path of a short-circuit current using a Dijkstra algorithm and the power grid diagram;

[0120] The parallel calculation result determination unit is used to obtain a parallel calculation result by using each of the short-circuit current calculation results and the propagation path.

[0121] In some specific implementations, the short-circuit current exceeding standard warning device of the AC / DC power grid may further include:

[0122] The calculation result analysis unit is used to synchronize the parallel calculation results to the central processing platform based on the communication link, so as to integrate and analyze the parallel calculation results through the central processing platform, and update the overall short-circuit state diagram of the AC and DC power grid using the analysis results.

[0123] In some specific implementations, the calculation result comparison module 13 may specifically include:

[0124] a current standard deviation determining unit, configured to determine the average amplitude of the current when a short circuit occurs in the AC / DC power grid based on the historical operation data of the power grid, so as to obtain an average value of the short-circuit current, and to determine the degree of change of the short-circuit current when a short circuit occurs in the AC / DC power grid through the historical operation data of the power grid, so as to obtain a standard deviation of the short-circuit current;

[0125] a first threshold value determining unit, configured to determine a first short-circuit current exceeding threshold value corresponding to each of the sub-regions by using the short-circuit current average value and the short-circuit current standard deviation, and compare each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value;

[0126] The judgment result determination unit is used to obtain a judgment result of short-circuit current exceeding the standard if any short-circuit current value in each of the short-circuit current calculation results is greater than the corresponding first short-circuit current exceeding standard threshold.

[0127] In some specific implementations, the judgment result fusion module 14 may specifically include:

[0128] an ambient temperature coefficient determination unit, for determining the ambient temperature coefficient based on the current ambient temperature of the operating area of ​​the AC / DC power grid and the resistance temperature variation coefficient, and using the ambient temperature coefficient to perform multi-criteria fusion on the judgment result of the short-circuit current exceeding the standard to obtain a fusion result; the resistance temperature variation coefficient is a coefficient of the conductor resistivity changing with temperature;

[0129] A judgment result modification unit, configured to modify the judgment result of short-circuit current exceeding the standard to short-circuit current misjudgment if the fusion result is greater than or equal to a second short-circuit current exceeding the standard threshold;

[0130] The over-limit warning triggering unit is used to trigger the short-circuit current over-limit warning if the fusion result is lower than the second short-circuit current over-limit threshold.

[0131] Furthermore, the present application also discloses an electronic device. Figure 3 It is a structural diagram of an electronic device 20 shown according to an exemplary embodiment, and the content in the figure cannot be regarded as any limitation on the scope of use of this application. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25 and a communication bus 26. Among them, the memory 22 is used to store a computer program, and the computer program is loaded and executed by the processor 21 to implement the relevant steps in the short-circuit current excessive warning method for AC / DC power grids disclosed in any of the aforementioned embodiments. In addition, the electronic device 20 in this embodiment may specifically be an electronic computer.

[0132] In this embodiment, the power supply 23 is used to provide working voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and the external device, and the communication protocol it follows is any communication protocol that can be applied to the technical solution of the present application, and is not specifically limited here; the input and output interface 25 is used to obtain external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs and is not specifically limited here.

[0133] In addition, the memory 22, as a carrier for storing resources, can be a read-only memory, a random access memory, a disk or an optical disk, etc. The resources stored thereon can include an operating system 221, a computer program 222, etc., and the storage method can be temporary storage or permanent storage.

[0134] The operating system 221 is used to manage and control the hardware devices and computer program 222 on the electronic device 20, and can be Windows Server, Netware, Unix, Linux, etc. In addition to the computer program that can be used to complete the short-circuit current exceeding standard warning method of the AC / DC power grid executed by the electronic device 20 disclosed in any of the aforementioned embodiments, the computer program 222 can further include computer programs that can be used to complete other specific tasks.

[0135] Furthermore, the present application also discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the short-circuit current exceeding standard warning method for AC and DC power grids disclosed above is implemented. The specific steps of the method can be referred to the corresponding contents disclosed in the above embodiments, and will not be repeated here.

[0136] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0137] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0138] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0139] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0140] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A short-circuit current exceeding standard warning method for AC / DC power grid, characterized in that: include: Using a preset monitoring tool to collect key information of each key node in the AC / DC power grid, then dividing the AC / DC power grid based on the topological structure of the power grid, and using the key information to perform equivalent construction on each sub-area obtained to obtain a regional electrical equivalent model; Using the regional electrical equivalent model to construct a power grid parallel computing framework, so as to perform parallel computing on the short-circuit current of each sub-region based on the power grid parallel computing framework, the graph computing model and the multi-threading technology, so as to obtain the corresponding parallel computing results; Determine a first short-circuit current exceeding threshold value corresponding to each of the sub-areas based on the historical operation data of the power grid, compare each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judge whether the short-circuit current exceeds the standard through the comparison result to obtain a judgment result; The ambient temperature coefficient is determined by the current ambient temperature of the operating area of ​​the AC / DC power grid, so as to perform multi-criteria fusion on the judgment result based on the ambient temperature coefficient. If the fusion result is lower than the second short-circuit current exceeding threshold, a short-circuit current exceeding warning is triggered.

2. The short-circuit current exceeding standard warning method of AC / DC power grid according to claim 1 is characterized in that: The using of a preset monitoring tool to collect key information of each key node in the AC / DC power grid includes: Using current sensors in a preset monitoring tool to collect the amplitude and waveform of the AC current and DC current at each key node in the AC / DC power grid and the frequency of the AC current; Collecting load change data of load equipment at each key node in the AC / DC power grid based on load sensors in a preset monitoring tool; Obtain key information using the amplitude and waveform of the AC current and DC current at each key node, the frequency of the AC current, and the load change data of the load device; The key nodes include transformer substations, distribution rooms, busbars, switchgear, load equipment, conversion stations in DC transmission systems, inverters, and junctions between AC and DC power grids.

3. The short-circuit current exceeding standard warning method of AC / DC power grid according to claim 1 is characterized in that: The AC / DC power grid is divided based on the topological structure of the power grid, and each sub-region obtained is constructed equivalently using the key information to obtain a regional electrical equivalent model, including: Based on the topological structure of the power grid and using a preset connection relationship, the AC and DC power grid is divided to obtain sub-areas; An RLC circuit model is constructed by using loads and electrical equipment in the AC / DC power grid, and circuit parameters in the RLC circuit model are adjusted using the key information to obtain a regional electrical equivalent model.

4. The short-circuit current exceeding standard warning method of AC / DC power grid according to claim 1 is characterized in that: The method of using the regional electrical equivalent model to construct a power grid parallel computing framework, and performing parallel computing on the short-circuit current of each sub-region based on the power grid parallel computing framework, the graph computing model and the multi-threading technology, to obtain the corresponding parallel computing results, includes: A power grid parallel computing framework is constructed using the regional electrical equivalent model of each sub-region and a distributed computing architecture to determine the electrical equivalent impedance of each sub-region based on the regional electrical equivalent model and multi-threading technology in the power grid parallel computing framework; Determine each short-circuit current calculation result by using the power supply voltage of each sub-area and the electrical equivalent impedance; Connecting the sub-regions and the key nodes by edges through a graph computing model to obtain a power grid diagram for characterizing the electrical connection relationship between the sub-regions in the AC / DC power grid, and determining the propagation path of the short-circuit current by using the Dijkstra algorithm and the power grid diagram; The parallel calculation results are obtained by using the short-circuit current calculation results and the propagation paths.

5. The short-circuit current exceeding standard warning method for AC / DC power grid according to any one of claims 1 to 4, characterized in that: After the short-circuit current of each of the sub-areas is calculated in parallel based on the power grid parallel computing framework, the graph computing model and the multi-threading technology to obtain the corresponding parallel computing results, the method further includes: The parallel calculation results are synchronized to a central processing platform based on a communication link, so that the parallel calculation results are integrated and analyzed by the central processing platform, and the overall short-circuit state diagram of the AC / DC power grid is updated using the analysis results.

6. The short-circuit current exceeding standard warning method of AC / DC power grid according to claim 1 is characterized in that: The determining of the first short-circuit current exceeding threshold value corresponding to each of the sub-areas based on the historical operation data of the power grid, comparing each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judging whether the short-circuit current exceeds the standard through the comparison result to obtain a judgment result, includes: Determine the average amplitude of the current when a short circuit occurs in the AC / DC power grid based on the historical operation data of the power grid to obtain an average value of the short-circuit current, and determine the degree of change of the short-circuit current when a short circuit occurs in the AC / DC power grid through the historical operation data of the power grid to obtain a standard deviation of the short-circuit current; Determine a first short-circuit current exceeding threshold value corresponding to each of the sub-regions by using the short-circuit current average value and the short-circuit current standard deviation, and compare each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value; If any short-circuit current value in each of the short-circuit current calculation results is greater than the corresponding first short-circuit current exceeding threshold, a judgment result of short-circuit current exceeding the standard is obtained.

7. The short-circuit current exceeding standard warning method of AC / DC power grid according to claim 6 is characterized in that: The step of determining the ambient temperature coefficient by the current ambient temperature of the operating area of ​​the AC / DC power grid, and performing multi-criteria fusion on the judgment result based on the ambient temperature coefficient, and triggering a short-circuit current exceeding threshold value if the fusion result is lower than a second short-circuit current exceeding threshold value, includes: An ambient temperature coefficient is determined based on the current ambient temperature of the operating area of ​​the AC / DC power grid and the resistance temperature variation coefficient, and the judgment result of the short-circuit current exceeding the standard is subjected to multi-criteria fusion using the ambient temperature coefficient to obtain a fusion result; the resistance temperature variation coefficient is a coefficient of the conductor resistivity changing with temperature; If the fusion result is greater than or equal to the second short-circuit current exceeding threshold, the judgment result of the short-circuit current exceeding the standard is modified to a short-circuit current misjudgment; If the fusion result is lower than the second short-circuit current exceeding standard threshold, a short-circuit current exceeding standard warning is triggered.

8. A short-circuit current exceeding standard warning device for AC and DC power grids, characterized in that: include: An equivalent model construction module is used to collect key information of each key node in the AC / DC power grid using a preset monitoring tool, then divide the AC / DC power grid based on the topological structure of the power grid, and use the key information to perform equivalent construction on each sub-region obtained to obtain a regional electrical equivalent model; A short-circuit current parallel calculation module is used to construct a power grid parallel calculation framework using the regional electrical equivalent model, so as to perform parallel calculation on the short-circuit current of each sub-region based on the power grid parallel calculation framework, the graph calculation model and the multi-threading technology, so as to obtain the corresponding parallel calculation results; A calculation result comparison module, used for determining a first short-circuit current exceeding threshold value corresponding to each of the sub-areas based on the historical operation data of the power grid, comparing each short-circuit current calculation result in the parallel calculation result with the corresponding first short-circuit current exceeding threshold value, and judging whether the short-circuit current exceeds the standard through the comparison result, so as to obtain a judgment result; The judgment result fusion module is used to determine the ambient temperature coefficient according to the current ambient temperature of the operating area of ​​the AC / DC power grid, so as to perform multi-criteria fusion on the judgment result based on the ambient temperature coefficient, and trigger a short-circuit current exceeding threshold value if the fusion result is lower than the second short-circuit current exceeding threshold value.

9. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor is used to execute the computer program to implement the short-circuit current exceeding standard warning method for AC / DC power grids according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Used to store a computer program, wherein when the computer program is executed by a processor, the short-circuit current exceeding standard warning method for an AC or DC power grid is implemented as claimed in any one of claims 1 to 7.

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