Electromagnetic transient comprehensive modeling method and device suitable for power grid real-time simulation

Abstract

The invention provides an electromagnetic transient comprehensive modeling method and device suitable for real-time simulation of a power grid, and relates to the technical field of simulation modeling. The method comprises the following steps: calculating the steady-state power flow of an optimal power equivalence system model to obtain steady-state power flow calculation result data; determining a typical disturbance position and a fault type of the optimal power equivalent system model according to the steady-state power flow calculation result data, and simulating the typical disturbance position and the fault type by using power system real-time simulation software to obtain simulated fault data; and analyzing and calculating the simulated fault data, determining the fault simulation accuracy degree according to a comparison result of the analysis and calculation result data and the steady-state load flow calculation result data, and realizing electromagnetic transient comprehensive modeling according to the fault simulation accuracy degree. The device executes the method. According to the method and the device provided by the embodiment of the invention, the transient process of the power system under disturbance and fault can be effectively simulated and analyzed.

Description

Technical Field

[0001] The present invention relates to the technical field of simulation modeling, and in particular to an electromagnetic transient comprehensive modeling method and device suitable for real-time simulation of power grids. Background Art

[0002] With the use of a high proportion of power electronic equipment in power systems, power system simulation is crucial in areas such as system stability analysis and fault analysis. However, due to the large-scale access of new energy and the participation of weak feedback links such as flexible direct current transmission, the transient characteristics of large systems after faults or disturbances have become more complex, thus placing higher requirements on the simulation accuracy of electromagnetic transients.

[0003] At present, the electromagnetic transient modeling method for power systems relies on the traditional implementation path of "equivalent power source + transmission line + infinity". When the system is more complex, it is difficult to accurately describe the power flow and electrical connection relationship between each link.

[0004] At present, the real-time simulation technology methods of flexible DC transmission system and access station are as follows: Figure 1 As shown, by building a model including lines, power sources, loads, and infinite systems in the power system simulation device, adjusting system parameters and the balance of the entire network flow as needed, the system modeling and transient analysis work is completed.

[0005] The simulation calculation steps are as follows:

[0006] (1) Establish a large power grid model, select simulation components according to the primary structure of the system, and adjust the grid model parameters.

[0007] (2) Improve the model and divide the large model into networks as needed, determine the power and control strategy of the interconnected power grid lines, and obtain system simulation data.

[0008] (3) Determine the disturbance or fault location according to the requirements, conduct a system analysis based on the simulation results, and determine whether the transient process meets the stability requirements.

[0009] In existing technical solutions, there are two defects in the modeling of electromagnetic transients in power systems:

[0010] (1) Model conversion between multiple types of real-time simulation systems is difficult. Currently, there are two mainstream simulation methods: expressing the interconnection between all nodes in the system in the form of a node matrix, and simulating by simulating the electrical topology connection of nodes within the system. In engineering applications, there is a large demand to convert the former model to the latter model. In this process, the connection parameters between nodes need to be recalculated, and it is difficult to accurately restore the system power flow. It also increases the difficulty of determining the access location of the equivalent machine, which greatly affects the reliability of the simulation calculation.

[0011] (2) For power systems with complex topologies, existing technologies often use a parallel approach to solve multiple subnets independently. When the sending and receiving ends in the subnets operate according to the full network conditions, the problem of subnet power imbalance will occur, increasing the demand for simulation resources and the system computing load, which will further affect the system calculation solution. Summary of the Invention

[0012] In response to the problems in the prior art, an embodiment of the present invention provides an electromagnetic transient comprehensive modeling method and device suitable for real-time simulation of a power grid, which can at least partially solve the problems in the prior art.

[0013] In one aspect, the present invention provides a comprehensive electromagnetic transient modeling method suitable for real-time simulation of power grids, comprising:

[0014] According to the predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data;

[0015] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy;

[0016] Determining typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data;

[0017] The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison results of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is achieved based on the fault simulation accuracy.

[0018] The determining of the typical disturbance location and fault type of the optimal power equivalent system model based on the steady-state power flow calculation result data includes:

[0019] Analyzing the steady-state power flow calculation result data to obtain target transmission lines and target buses that have a large impact on system power flow distribution, and determining the target transmission lines and target buses as the typical disturbance locations;

[0020] The fault type is determined according to the target transmission line and the target bus.

[0021] The analyzing and calculating the simulated fault data includes:

[0022] The simulated fault data is analyzed and calculated using symmetrical component and network matrix methods.

[0023] The method of implementing electromagnetic transient comprehensive modeling according to the accuracy of the fault simulation includes:

[0024] If it is determined that the accuracy of the fault simulation reaches a preset accuracy index, electromagnetic transient comprehensive modeling is performed based on the steady-state power flow calculation result data.

[0025] The electromagnetic transient comprehensive modeling method suitable for real-time simulation of power grids also includes:

[0026] If it is determined that the accuracy of the fault simulation does not reach the preset accuracy index, the model parameters of the optimal power equivalent system model and / or the impedance array model are periodically optimized, and the steady-state power flow of the optimal power equivalent system model is recalculated using the power system real-time simulation software according to the optimized node correspondence after the model parameter optimization to obtain optimized steady-state power flow calculation result data;

[0027] Subsequent steps are performed based on the optimized steady-state power flow calculation result data until the fault simulation accuracy reaches a preset accuracy index.

[0028] Before the step of determining the node correspondence between the predetermined optimal power equivalent system model and the impedance array model, the electromagnetic transient integrated modeling method suitable for real-time power grid simulation further includes:

[0029] Building the electric power equivalent system model and determining the topological relationship of the electric power equivalent system model;

[0030] Performing hierarchical and partitioning processing on the power equivalent system model to obtain a plurality of sub-network models under different hierarchical and partitioning modes;

[0031] Performing system power flow calculations on the multiple sub-network models according to the topological relationships, and selecting an optimal sub-network mode that balances calculation efficiency and calculation accuracy according to the system power flow calculation results;

[0032] The power equivalent system model under the optimal network division mode is run to obtain the optimal power equivalent system model.

[0033] In one aspect, the present invention provides an electromagnetic transient comprehensive modeling device suitable for real-time simulation of a power grid, comprising:

[0034] a calculation unit, configured to calculate the steady-state power flow of the optimal power equivalent system model using power system real-time simulation software according to a predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, and obtain steady-state power flow calculation result data;

[0035] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy;

[0036] a determination unit, configured to determine typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, and simulate the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data;

[0037] The modeling unit is used to analyze and calculate the simulated fault data, determine the fault simulation accuracy based on the comparison results of the analysis and calculation data with the steady-state power flow calculation data, and implement electromagnetic transient comprehensive modeling based on the fault simulation accuracy.

[0038] The determining unit is specifically configured to:

[0039] Analyzing the steady-state power flow calculation result data to obtain target transmission lines and target buses that have a large impact on system power flow distribution, and determining the target transmission lines and target buses as the typical disturbance locations;

[0040] The fault type is determined according to the target transmission line and the target bus.

[0041] Wherein, the modeling unit is specifically used for:

[0042] The simulated fault data is analyzed and calculated using symmetrical component and network matrix methods.

[0043] Wherein, the modeling unit is specifically used for:

[0044] If it is determined that the accuracy of the fault simulation reaches a preset accuracy index, electromagnetic transient comprehensive modeling is performed based on the steady-state power flow calculation result data.

[0045] The electromagnetic transient comprehensive modeling device suitable for real-time simulation of power grids is further used for:

[0046] If it is determined that the accuracy of the fault simulation does not reach the preset accuracy index, the model parameters of the optimal power equivalent system model and / or the impedance array model are periodically optimized, and the steady-state power flow of the optimal power equivalent system model is recalculated using the power system real-time simulation software according to the optimized node correspondence after the model parameter optimization to obtain optimized steady-state power flow calculation result data;

[0047] Subsequent steps are performed based on the optimized steady-state power flow calculation result data until the fault simulation accuracy reaches a preset accuracy index.

[0048] Wherein, before the step of determining the node correspondence relationship between the predetermined optimal power equivalent system model and the impedance array model, the electromagnetic transient comprehensive modeling device suitable for real-time power grid simulation is further used to:

[0049] Building the electric power equivalent system model and determining the topological relationship of the electric power equivalent system model;

[0050] Performing hierarchical and partitioning processing on the power equivalent system model to obtain a plurality of sub-network models under different hierarchical and partitioning modes;

[0051] Performing system power flow calculations on the multiple sub-network models according to the topological relationships, and selecting an optimal sub-network mode that balances calculation efficiency and calculation accuracy according to the system power flow calculation results;

[0052] The power equivalent system model under the optimal network division mode is run to obtain the optimal power equivalent system model.

[0053] In another aspect, an embodiment of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the following method is implemented:

[0054] According to the predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data;

[0055] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy;

[0056] Determining typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data;

[0057] The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison results of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is achieved based on the fault simulation accuracy.

[0058] An embodiment of the present invention provides a computer-readable storage medium, including:

[0059] The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0060] According to the predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data;

[0061] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy;

[0062] Determining typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data;

[0063] The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison results of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is achieved based on the fault simulation accuracy.

[0064] An embodiment of the present invention further provides a computer program product, comprising a computer program. When the computer program is executed by a processor, the computer program implements the following method:

[0065] According to the predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data;

[0066] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy;

[0067] Determining typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data;

[0068] The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison results of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is achieved based on the fault simulation accuracy.

[0069] The embodiment of the present invention provides an electromagnetic transient comprehensive modeling method and device suitable for real-time simulation of a power grid. According to a predetermined node correspondence between an optimal power equivalent system model and an impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data. The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal grid-dividing manner based on balanced calculation efficiency and calculation accuracy. The typical disturbance location and fault type of the optimal power equivalent system model are determined based on the steady-state power flow calculation result data, and the typical disturbance location and fault type are simulated using the power system real-time simulation software to obtain simulated fault data. The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison result of the analysis and calculation result data with the steady-state power flow calculation result data. The electromagnetic transient comprehensive modeling is implemented based on the fault simulation accuracy, taking into account the primary structure of the power grid and the electrical connection relationship of all nodes in the system. Through the electromagnetic transient comprehensive modeling, the transient process of the power system under disturbance and fault can be effectively simulated and analyzed. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0071] Figure 1 It is a schematic diagram illustrating electromagnetic transient analysis based on simulation software provided by the existing technology.

[0072] Figure 2 It is a schematic diagram illustrating the basic architecture of the electromagnetic transient comprehensive modeling method based on real-time power grid simulation provided by an embodiment of the present invention.

[0073] Figure 3 It is a flow chart of a comprehensive electromagnetic transient modeling method for real-time power grid simulation provided by an embodiment of the present invention.

[0074] Figure 4 It is a flow chart of a comprehensive electromagnetic transient modeling method suitable for real-time simulation of a power grid provided by another embodiment of the present invention.

[0075] Figure 5 It is a structural diagram of an electromagnetic transient comprehensive modeling device suitable for real-time power grid simulation provided by one embodiment of the present invention.

[0076] Figure 6 A schematic diagram of the physical structure of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0077] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of this application can be combined with each other in any manner.

[0078] Explanation of related terms:

[0079] Electromagnetic transients: The electromagnetic transient processes of power systems mainly study the dynamic processes in power systems ranging from microseconds to several seconds. The research objects mainly include: transient processes caused by external factors, transient processes caused by control, and fast transient processes in transmission systems.

[0080] Impedance matrix: refers to a matrix that expresses the complex impedance relationship between any two points in the power system. It can be used to calculate the power flow relationship between nodes in the primary system to further evaluate issues such as system stability.

[0081] Power system real-time simulation: A fully digital real-time simulation system based on high-performance cluster servers, utilizing the cluster's multi-node structure and high-speed local network, using parallel computing technology to decompose computing tasks, and performing real-time and synchronous control of processes.

[0082] The basic structure of the electromagnetic transient comprehensive modeling method based on real-time power grid simulation is as follows: Figure 2 shown.

[0083] Figure 3 FIG. 1 is a flow chart of an electromagnetic transient integrated modeling method for real-time power grid simulation provided by an embodiment of the present invention. Figure 3 As shown, the electromagnetic transient comprehensive modeling method applicable to real-time simulation of power grids provided by the embodiment of the present invention includes:

[0084] Step S1: Based on a predetermined node correspondence relationship between an optimal power equivalent system model and an impedance array model, a steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data;

[0085] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy.

[0086] Step S2: determining the typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software, and obtaining simulated fault data.

[0087] Step S3: Analyze and calculate the simulated fault data, determine the fault simulation accuracy based on the comparison results of the analysis and calculation data with the steady-state power flow calculation data, and implement electromagnetic transient comprehensive modeling based on the fault simulation accuracy.

[0088] In the above step S1, the device calculates the steady-state power flow of the optimal power equivalent system model using the power system real-time simulation software according to the node correspondence between the predetermined optimal power equivalent system model and the impedance array model, and obtains the steady-state power flow calculation result data;

[0089] The optimal power equivalent system model is obtained by running the power equivalent system model in an optimal network mode based on the balance calculation efficiency and calculation accuracy. The device can be a computer device that executes the method. The acquisition, storage, use, and processing of data in the technical solution of this application are in compliance with relevant regulations. The node correspondence relationship is as follows Figure 2 The steady-state power flow calculation result data can include power flow section, node voltage, synchronous machine output, wind turbine and photovoltaic output, etc.

[0090] The steady-state power flow of the optimal power equivalent system model is described as follows:

[0091] Calculating the steady-state power flow of the power equivalent system model involves the following key steps:

[0092] Establish a node model of the power system:

[0093] Methods such as single-phase equivalent method, three-phase unbalance method, and complex number algorithm can be used.

[0094] List the node voltage balance equations:

[0095] It is necessary to consider the operating status and parameters of various equipment in the power system, such as the output power and voltage of the generator, the ratio and loss of the transformer, the resistance and reactance of the transmission line, etc.

[0096] Select a solving method:

[0097] Commonly used solution methods include iterative method, Gauss-Seidel method, Newton-Raphson method, etc. Among them, Newton-Raphson method is the most widely used in current power flow calculations due to its superiority in convergence, storage capacity and computation time.

[0098] Write a calculation program:

[0099] It can be implemented using computing tools and programming languages such as MATLAB, Python, and FORTRAN.

[0100] Analysis and calculation results:

[0101] Various graphs and statistical methods can be used, such as power-voltage curves, node voltage distribution diagrams, system energy loss, etc.

[0102] Calculations typically express node voltages in polar coordinates and solve for the node voltage equations in the circuit. For n nodes, each node corresponds to two equations, and up to 2n equations can be written for n nodes. Using iterative methods, particularly the Newton-Raphson method, the initial assumptions are continuously refined until the resulting result is within the acceptable error range.

[0103] Furthermore, power flow calculation is a mathematical process involving solving a set of nonlinear equations. For an operating power system, power flow calculation can determine whether bus voltage, branch current, and power exceed limits. If so, measures should be taken to adjust the operating mode. For power systems under planning, power flow calculation can provide a basis for selecting power supply solutions and electrical equipment.

[0104] Before the step of determining the node correspondence between the predetermined optimal power equivalent system model and the impedance array model, the electromagnetic transient integrated modeling method suitable for real-time power grid simulation further includes:

[0105] Build the electric power equivalent system model and determine the topological relationship of the electric power equivalent system model; Figure 2 As shown, according to the power flow calculation relationship between power nodes, on the basis of determining the primary structure of the power grid, the parameters of each electrical component in the power equivalent system model and the connection mode between different electrical nodes are determined.

[0106] The power flow calculation relationship between power nodes is mainly determined by solving a set of nonlinear equations based on the node admittance matrix to determine the voltage amplitude, phase angle and power distribution of each node.

[0107] The primary structure of a power grid primarily includes key equipment such as generators, transformers, transmission lines, circuit breakers, disconnectors, and busbars. These devices together constitute the primary structure of the power grid, responsible for the generation, transmission, and distribution of electrical energy.

[0108] The main connection methods between electrical nodes in the power equivalent system model are series and parallel. Furthermore, more complex power system connections involve different configurations of open and closed power grids, as well as various substation main electrical connections, such as single busbar connection, single busbar segmented connection, double busbar connection, and bridge connection.

[0109] The power equivalent system model is hierarchically partitioned to obtain a variety of sub-network models under different hierarchical partitioning methods; according to the network voltage level, the power equivalent system model is divided into multiple levels from high to low, and the different levels are divided into multiple areas according to the principle of reactive power balance.

[0110] Network voltage levels refer to the classification of different voltage levels in the power system, which are used to meet the power transmission and distribution needs of different scenarios. The grid voltage levels are divided into low voltage, medium voltage, high voltage, ultra-high voltage and ultra-high voltage, and each level has its own specific application scope and characteristics. The multiple levels are explained as follows:

[0111] Ultra-high voltage (UHV): This level has the highest voltage levels, typically including DC ±800kV and AC 1000kV and above. This level is primarily used for large-scale, long-distance power transmission.

[0112] Ultra-high voltage (EHV): Voltage levels range from 330kV to 750kV. This level is also used for long-distance power transmission and forms the backbone of the power grid.

[0113] High-voltage level: Voltage levels typically include 220 kV, 110 kV (also known as sub-transmission voltage), and 35 kV. This level is primarily used for power transmission and supplying large-scale power grid equipment. In particular, 110 kV and 220 kV lines are often referred to as high-voltage lines.

[0114] Medium voltage: This voltage level is usually 10 kV (or 20 kV in some places), also known as primary distribution voltage. This level is mainly used for urban power supply and general industrial electricity.

[0115] Low voltage level: The voltage level is usually 380V / 220V, also known as secondary distribution voltage. This level is mainly used for household electricity, commercial electricity and small industrial electricity.

[0116] According to the principle of reactive power balance, different levels of the power equivalent system model are mainly divided into two levels: stratification and zoning. Stratification refers to the 220-500KV power grid that mainly undertakes active power transmission, and the reactive power balance between voltage layers should be maintained as much as possible to reduce the reactive power crosstalk between voltage layers. Zoning refers to the power supply grid of 110KV and below, which should realize reactive power zoning and local balance.

[0117] According to the topological relationship, the system flow calculation is performed on the multiple sub-network models respectively, and the optimal sub-network mode that balances the calculation efficiency and calculation accuracy is selected according to the system flow calculation results; the topological relationship can reflect the parameters of each electrical component in the power equivalent system model and the connection mode between different electrical nodes. The flow calculation does require the electrical component parameters and connection mode of the power equivalent system model. The flow calculation refers to the calculation of the distribution of active power, reactive power and voltage in the power grid under the given power system network topology, component parameters and power generation and load parameters. The "component parameters" here include the specific parameters of various electrical components (such as lines, transformers, etc.), such as resistance, reactance, admittance to ground, etc.; "connection mode" refers to the connection topology of these components in the power system. The flow calculation is based on these parameters and connection modes to determine the calculation of the steady-state operating state parameters of each part of the power system.

[0118] Specifically, the raw data required for power flow calculations include branch component parameters (such as line resistance, reactance, ground admittance, and transformer ratio), as well as generator and load parameters. These parameters, along with the connection method, form the basis for power flow calculations, enabling accurate calculation of the power distribution and voltage levels of the power system in steady state.

[0119] Select the optimal partitioning scheme that balances calculation efficiency and calculation accuracy to calculate the system power, select the network partitioning method based on the system power calculation results, and then determine the optimal network partitioning method.

[0120] Run the power equivalent system model under the optimal sub-grid mode to obtain the optimal power equivalent system model. The impedance matrix model including RLC and transformer models of all target nodes in each sub-grid (sub-grid model) of the optimal power equivalent system model can be built, and the following is established: Figure 2 The node correspondence between the optimal power equivalent system model and the impedance matrix model is shown. The above target nodes can be important nodes selected independently.

[0121] Then, the above node correspondence and the like can be input into the power system real-time simulation software, and the steady-state power flow of the optimal power equivalent system model can be calculated by the power system real-time simulation software to obtain the steady-state power flow calculation result data.

[0122] In the above step S2, the device determines the typical disturbance location and fault type of the optimal power equivalent system model based on the steady-state power flow calculation result data, and uses the power system real-time simulation software to simulate the typical disturbance location and fault type to obtain simulated fault data. The determining of the typical disturbance location and fault type of the optimal power equivalent system model based on the steady-state power flow calculation result data includes:

[0123] The steady-state power flow calculation result data is analyzed to obtain target transmission lines and target buses that have a significant impact on the system power flow distribution, and the target transmission lines and target buses are determined as the typical disturbance locations. It should be noted that certain nodes or lines have a significant impact on the system power flow distribution. This can be understood as there being M nodes in the system, of which two will cause the system voltage to drop to 0.5 pu or significantly affect system stability after an n-1 fault, and the remaining M-2 nodes will cause the system voltage to drop to 0.9 pu or have little impact on system stability after an n-1 fault. In this case, these two nodes are judged to have a significant impact on the system power flow distribution. There is no unified standard for the two values of 0.5 / 0.9 pu, and each system needs to be analyzed and discussed separately based on its different characteristics.

[0124] The fault type is determined based on the target transmission line and the target bus. The disturbance location refers to the specific location where the fault or abnormality occurs in the power system, while the fault type describes the nature of the fault, such as three-phase short circuit, single-phase ground short circuit, etc. The specific description is as follows:

[0125] Large disturbances on target transmission lines and busbars typically have a significant impact on system power flow distribution. These disturbances primarily include those that cause significant power or impedance changes, such as short circuits in system components and circuit breaker switching. These disturbances can also include single-phase transient ground faults with successful reclosing, tripping or demagnetization of any generator, and bipolar faults on DC transmission lines. These fault types can lead to power flow redistribution and may even cause serious consequences such as voltage collapse. Therefore, these locations and their corresponding fault types are typical disturbance locations and fault types that require attention.

[0126] In step S3, the device analyzes and calculates the simulated fault data, determines the fault simulation accuracy based on a comparison between the analysis and calculation results and the steady-state power flow calculation results, and implements electromagnetic transient integrated modeling based on the fault simulation accuracy. If the comparison between the analysis and calculation results and the steady-state power flow calculation results is a first comparison result that is within a preset error value, then it is determined that the fault simulation accuracy has met the preset accuracy indicator.

[0127] If the comparison result between the analysis calculation result data and the steady-state power flow calculation result data is a second comparison result outside the preset error value, it is determined that the fault simulation accuracy does not meet the preset accuracy index.

[0128] The analyzing and calculating the simulated fault data includes:

[0129] The simulated fault data is analyzed and calculated using the symmetrical component and network matrix method. The specific instructions are as follows:

[0130] The fault power flow of typical faults is analyzed and calculated based on the symmetrical component and network matrix method. First, the asymmetrical fault is decomposed into positive-sequence, negative-sequence and zero-sequence components using the symmetrical component method, and then the power flow of each sequence component at the fault point is calculated in combination with the network matrix method.

[0131] The core concept of the symmetrical component method is to decompose a three-phase asymmetrical system into three independent symmetrical systems: the positive-sequence, negative-sequence, and zero-sequence component systems. Each component system has symmetrical three-phase voltages and currents, facilitating calculations using Ohm's law and Kirchhoff's voltage-current law. In practical applications, the fault type must first be identified, such as single-phase ground fault, two-phase short circuit, or two-phase ground short circuit. The corresponding symmetrical component model is then determined based on the fault type.

[0132] Next, the system's equivalent circuit must be determined, including the equivalent impedance at the fault point. By listing the voltage balance equations for each sequence or calculating the equivalent impedance of each sequence relative to the fault point, combined with the boundary conditions at the fault point, the components of each sequence at the fault point can be calculated. This calculation utilizes the network matrix method, which constructs a network matrix to describe the connections and electrical parameters between components in the power system.

[0133] The specific steps include:

[0134] Determine the parameters of the positive sequence, negative sequence and zero sequence networks according to the fault type.

[0135] The short-circuit current and voltage of each sequence network are calculated using the network matrix method.

[0136] The actual short-circuit current is obtained by adding the three-sequence currents, and thus the actual current and voltage at the fault point are obtained.

[0137] For example, in a single-phase ground fault, the zero-sequence current will increase significantly, while the positive-sequence and negative-sequence currents remain unchanged. By analyzing and calculating the three-sequence currents separately, and finally synthesizing the three-phase asymmetrical short-circuit current using the principle of the symmetrical component method, the actual current and voltage at the fault point are obtained. The electromagnetic transient comprehensive modeling based on the accuracy of the fault simulation includes:

[0138] If it is determined that the fault simulation accuracy reaches the preset accuracy index, electromagnetic transient comprehensive modeling is performed based on the steady-state power flow calculation result data. The electromagnetic transient comprehensive modeling method suitable for real-time power grid simulation also includes:

[0139] If it is determined that the accuracy of the fault simulation does not reach the preset accuracy index, the model parameters of the optimal power equivalent system model and / or the impedance array model are periodically optimized, and the steady-state power flow of the optimal power equivalent system model is recalculated using the power system real-time simulation software according to the optimized node correspondence after the model parameters are optimized to obtain the optimized steady-state power flow calculation result data; the specific implementation can be as follows Figure 4 shown.

[0140] Subsequent steps are performed based on the optimized steady-state power flow calculation result data until the fault simulation accuracy reaches a preset accuracy index.

[0141] like Figure 4 As shown, the electromagnetic transient comprehensive modeling method applicable to real-time power grid simulation provided by the embodiment of the present invention is further described as follows:

[0142] Step 1: Based on the power flow calculation relationship between power nodes and the primary structure of the power grid, determine the parameters of each electrical component in the power equivalent system model and the connection method (topological relationship) between different electrical nodes;

[0143] Step 2: Divide the power equivalent system model into multiple levels from high to low according to the network voltage level, and divide the different levels into multiple regions based on the principle of reactive power balance. Perform system flow calculations on various sub-network models based on the topological relationship. Based on the system flow calculation results, select the optimal sub-network method for balance calculation efficiency and accuracy. Select the optimal partitioning scheme for balance calculation efficiency and accuracy to perform system power calculations. Based on the system power calculation results, select the sub-network method and determine the optimal sub-network method.

[0144] Step 3: Run the power equivalent system model under the optimal sub-grid mode to obtain the optimal power equivalent system model. The impedance matrix model including RLC and transformer models of all target nodes in each sub-grid (sub-grid model) of the optimal power equivalent system model can be built, and the following Figure 2 The node correspondence between the optimal power equivalent system model and the impedance matrix model shown;

[0145] Step 4: Based on the above node correspondence, use the power system real-time simulation software to calculate the steady-state power flow of the optimal power equivalent system model and obtain the steady-state power flow calculation result data;

[0146] Step 5: Based on the steady-state power flow calculation result data obtained in step 4, the steady-state power flow calculation result data is analyzed to obtain target transmission lines and target buses whose impact on system power flow distribution is greater than a preset index value, and typical disturbance locations and fault types are determined based on the target transmission lines and target buses;

[0147] Step 6: Use power system real-time simulation software to simulate the typical disturbance locations and fault types in step 5 to obtain simulated fault data, including line and main transformer voltage and current data under all faults, wind turbine and photovoltaic active output levels, section power flow data, etc.

[0148] Step 7: Analyze and calculate the simulated fault data using the symmetrical component and network matrix method. Based on the comparison of the analysis and calculation results with the steady-state power flow calculation results in step 4 above, determine the accuracy of the fault simulation of the optimal power equivalent system model. If it is determined that the fault simulation accuracy does not meet the preset accuracy index, further optimize the model parameters of the optimal power equivalent system model and / or impedance matrix model in step 3, and continue to execute subsequent steps.

[0149] Step 8: If it is determined that the fault simulation accuracy reaches the preset accuracy index, electromagnetic transient comprehensive modeling is performed based on the steady-state power flow calculation result data, and various parameters, namely the steady-state power flow calculation result data, can also be recorded.

[0150] The electromagnetic transient comprehensive modeling method for real-time power grid simulation provided by the embodiment of the present invention has the following beneficial technical effects:

[0151] (1) In order to solve the problem that a single type of simulation software is difficult to balance the system topology electrical connection and system equivalent accuracy, the integrated simulation of two forms of data, the power system equivalent model and the impedance array model, is achieved by interconnecting the same node in the two models, effectively and accurately fitting the power system flow.

[0152] (2) Aiming at the subgrid solution problem after the complex topology power system is divided into two parts, the subgrid power imbalance problem is solved, and the demand for computing resources of the system solution and the large system is balanced.

[0153] An embodiment of the present invention provides an electromagnetic transient comprehensive modeling method suitable for real-time simulation of a power grid. According to a predetermined node correspondence relationship between an optimal power equivalent system model and an impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data. The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal grid-dividing manner based on balanced calculation efficiency and calculation accuracy. Typical disturbance locations and fault types of the optimal power equivalent system model are determined based on the steady-state power flow calculation result data. The typical disturbance locations and fault types are simulated using the power system real-time simulation software to obtain simulated fault data. The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on a comparison result of the analysis and calculation result data with the steady-state power flow calculation result data. Electromagnetic transient comprehensive modeling is implemented based on the fault simulation accuracy, taking into account the primary structure of the power grid and the electrical connection relationship of all nodes in the system. Through electromagnetic transient comprehensive modeling, effective simulation and analysis of the transient process of the power system under disturbance and fault can be achieved.

[0154] Furthermore, determining the typical disturbance location and fault type of the optimal power equivalent system model based on the steady-state power flow calculation result data includes:

[0155] The steady-state power flow calculation result data is analyzed to obtain the target transmission line and target bus that have a large impact on the system power flow distribution, and the target transmission line and the target bus are determined as the typical disturbance locations; the above embodiment can be referred to for description and will not be repeated here.

[0156] The fault type is determined according to the target transmission line and the target bus.

[0157] Furthermore, the analyzing and calculating the simulated fault data includes:

[0158] The simulated fault data is analyzed and calculated using the symmetrical component and network matrix method.

[0159] Furthermore, the electromagnetic transient comprehensive modeling is implemented according to the accuracy of the fault simulation, including:

[0160] If it is determined that the fault simulation accuracy reaches the preset accuracy index, electromagnetic transient integrated modeling is performed based on the steady-state power flow calculation result data.

[0161] Furthermore, the electromagnetic transient comprehensive modeling method suitable for real-time simulation of power grids also includes:

[0162] If it is determined that the accuracy of the fault simulation does not reach the preset accuracy index, the model parameter optimization of the optimal power equivalent system model and / or the impedance array model is periodically performed, and the steady-state power flow of the optimal power equivalent system model is recalculated according to the optimized node correspondence after the model parameter optimization and the power system real-time simulation software is used to obtain the optimized steady-state power flow calculation result data; the above-mentioned embodiment can be referred to for description and will not be repeated here.

[0163] Subsequent steps are performed based on the optimized steady-state power flow calculation result data until the fault simulation accuracy reaches a preset accuracy index.

[0164] Furthermore, before the step of determining the node correspondence between the predetermined optimal power equivalent system model and the impedance array model, the electromagnetic transient integrated modeling method suitable for real-time power grid simulation further includes:

[0165] The electric power equivalent system model is constructed, and the topological relationship of the electric power equivalent system model is determined; the above-mentioned embodiments can be referred to for description and will not be repeated here.

[0166] The electric power equivalent system model is subjected to hierarchical and partitioning processing to obtain a variety of sub-network models under different hierarchical and partitioning methods; the above-mentioned embodiment can be referred to for description and will not be repeated here.

[0167] According to the topological relationship, the system flow calculation is performed on the multiple sub-network models respectively, and the optimal sub-network mode that balances the calculation efficiency and calculation accuracy is selected according to the system flow calculation results; the above embodiment can be referred to for description and will not be repeated here.

[0168] The power equivalent system model under the optimal network division mode is run to obtain the optimal power equivalent system model.

[0169] Figure 5 FIG. 1 is a schematic diagram of the structure of an electromagnetic transient comprehensive modeling device suitable for real-time simulation of a power grid provided by an embodiment of the present invention. Figure 5 As shown, the electromagnetic transient comprehensive modeling device suitable for real-time simulation of a power grid provided by an embodiment of the present invention includes a calculation unit 501, a determination unit 502 and a modeling unit 503, wherein:

[0170] The calculation unit 501 is used to calculate the steady-state power flow of the optimal power equivalent system model based on the node correspondence between the predetermined optimal power equivalent system model and the impedance array model using the power system real-time simulation software, and obtain the steady-state power flow calculation result data; wherein, the optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal grid-dividing manner based on the balance calculation efficiency and calculation accuracy; the determination unit 502 is used to determine the typical disturbance location and fault type of the optimal power equivalent system model based on the steady-state power flow calculation result data, and use the power system real-time simulation software to simulate the typical disturbance location and fault type to obtain simulated fault data; the modeling unit 503 is used to analyze and calculate the simulated fault data, determine the fault simulation accuracy based on the comparison result of the analysis and calculation result data with the steady-state power flow calculation result data, and realize electromagnetic transient comprehensive modeling according to the fault simulation accuracy.

[0171] Specifically, the calculation unit 501 in the device is used to calculate the steady-state power flow of the optimal power equivalent system model based on the node correspondence between the predetermined optimal power equivalent system model and the impedance array model using the power system real-time simulation software, and obtain the steady-state power flow calculation result data; wherein, the optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal grid-dividing manner based on the balance calculation efficiency and calculation accuracy; the determination unit 502 is used to determine the typical disturbance position and fault type of the optimal power equivalent system model based on the steady-state power flow calculation result data, and use the power system real-time simulation software to simulate the typical disturbance position and fault type to obtain simulated fault data; the modeling unit 503 is used to analyze and calculate the simulated fault data, determine the fault simulation accuracy based on the comparison result of the analysis and calculation result data with the steady-state power flow calculation result data, and realize electromagnetic transient comprehensive modeling according to the fault simulation accuracy.

[0172] An embodiment of the present invention provides an electromagnetic transient comprehensive modeling device suitable for real-time simulation of a power grid. According to a predetermined node correspondence between an optimal power equivalent system model and an impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data. The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal grid-dividing manner based on balanced calculation efficiency and calculation accuracy. Typical disturbance locations and fault types of the optimal power equivalent system model are determined based on the steady-state power flow calculation result data, and the typical disturbance locations and fault types are simulated using the power system real-time simulation software to obtain simulated fault data. The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on a comparison result of the analysis and calculation result data with the steady-state power flow calculation result data. Electromagnetic transient comprehensive modeling is implemented based on the fault simulation accuracy, taking into account the primary structure of the power grid and the electrical connection relationship of all nodes in the system. Through electromagnetic transient comprehensive modeling, effective simulation and analysis of the transient process of the power system under disturbance and fault can be achieved.

[0173] Furthermore, the determining unit 502 is specifically configured to:

[0174] Analyzing the steady-state power flow calculation result data to obtain target transmission lines and target buses that have a large impact on system power flow distribution, and determining the target transmission lines and target buses as the typical disturbance locations;

[0175] The fault type is determined according to the target transmission line and the target bus.

[0176] Furthermore, the modeling unit 503 is specifically configured to:

[0177] The simulated fault data is analyzed and calculated using symmetrical component and network matrix methods.

[0178] Furthermore, the modeling unit 503 is specifically configured to:

[0179] If it is determined that the accuracy of the fault simulation reaches a preset accuracy index, electromagnetic transient comprehensive modeling is performed based on the steady-state power flow calculation result data.

[0180] Furthermore, the electromagnetic transient comprehensive modeling device suitable for real-time simulation of power grids is also used for:

[0181] If it is determined that the accuracy of the fault simulation does not reach the preset accuracy index, the model parameters of the optimal power equivalent system model and / or the impedance array model are periodically optimized, and the steady-state power flow of the optimal power equivalent system model is recalculated using the power system real-time simulation software according to the optimized node correspondence after the model parameter optimization to obtain optimized steady-state power flow calculation result data;

[0182] Subsequent steps are performed based on the optimized steady-state power flow calculation result data until the fault simulation accuracy reaches a preset accuracy index.

[0183] Furthermore, before the step of determining the node correspondence between the predetermined optimal power equivalent system model and the impedance array model, the electromagnetic transient integrated modeling device suitable for real-time power grid simulation is further used to:

[0184] Building the electric power equivalent system model and determining the topological relationship of the electric power equivalent system model;

[0185] Performing hierarchical and partitioning processing on the power equivalent system model to obtain a plurality of sub-network models under different hierarchical and partitioning modes;

[0186] Performing system power flow calculations on the multiple sub-network models according to the topological relationships, and selecting an optimal sub-network mode that balances calculation efficiency and calculation accuracy according to the system power flow calculation results;

[0187] The power equivalent system model under the optimal network division mode is run to obtain the optimal power equivalent system model.

[0188] The embodiment of the present invention provides an embodiment of an electromagnetic transient comprehensive modeling device suitable for real-time simulation of a power grid, which can be specifically used to execute the processing flow of the above-mentioned method embodiments. Its functions are not repeated here, and reference can be made to the detailed description of the above-mentioned method embodiments.

[0189] Figure 6 A schematic diagram of the physical structure of a computer device provided in an embodiment of the present invention is shown in FIG. Figure 6 As shown, the computer device includes: a memory 601, a processor 602, and a computer program stored in the memory 601 and executable on the processor 602. When the processor 602 executes the computer program, the following method is implemented:

[0190] According to the predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data;

[0191] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy;

[0192] Determining typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data;

[0193] The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison results of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is achieved based on the fault simulation accuracy.

[0194] This embodiment discloses a computer program product, which includes a computer program. When the computer program is executed by a processor, the following method is implemented:

[0195] According to the predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data;

[0196] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy;

[0197] Determining typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data;

[0198] The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison results of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is achieved based on the fault simulation accuracy.

[0199] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the following method is implemented:

[0200] According to the predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data;

[0201] The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy;

[0202] Determining typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data;

[0203] The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison results of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is achieved based on the fault simulation accuracy.

[0204] Compared with the technical solutions in the prior art, the embodiments of the present invention provide an electromagnetic transient comprehensive modeling method suitable for real-time simulation of a power grid. According to a predetermined node correspondence relationship between an optimal power equivalent system model and an impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data; wherein the optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal grid-dividing manner based on balanced calculation efficiency and calculation accuracy; the typical disturbance location and fault type of the optimal power equivalent system model are determined based on the steady-state power flow calculation result data, and the typical disturbance location and fault type are simulated using the power system real-time simulation software to obtain simulated fault data; the simulated fault data are analyzed and calculated, and the fault simulation accuracy is determined based on the comparison result of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is implemented based on the fault simulation accuracy, taking into account the primary structure of the power grid and the electrical connection relationship of all nodes in the system. Through electromagnetic transient comprehensive modeling, it is possible to effectively simulate and analyze the transient process of the power system under disturbance and fault.

[0205] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely 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 magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0206] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, 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 produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. 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.

[0207] 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 work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0208] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0209] Throughout this specification, reference to terms such as "one embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0210] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A comprehensive electromagnetic transient modeling method suitable for real-time simulation of power grids, characterized in that: include: According to the predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, the steady-state power flow of the optimal power equivalent system model is calculated using power system real-time simulation software to obtain steady-state power flow calculation result data; The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy; Determining typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, simulating the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data; The simulated fault data is analyzed and calculated, and the fault simulation accuracy is determined based on the comparison results of the analysis and calculation result data with the steady-state power flow calculation result data, and electromagnetic transient comprehensive modeling is achieved based on the fault simulation accuracy.

2. The electromagnetic transient comprehensive modeling method suitable for real-time simulation of power grid according to claim 1 is characterized in that: Determining the typical disturbance location and fault type of the optimal power equivalent system model based on the steady-state power flow calculation result data includes: Analyzing the steady-state power flow calculation result data to obtain target transmission lines and target buses that have a large impact on system power flow distribution, and determining the target transmission lines and target buses as the typical disturbance locations; The fault type is determined according to the target transmission line and the target bus.

3. The electromagnetic transient comprehensive modeling method suitable for real-time simulation of power grid according to claim 1 is characterized in that: The analyzing and calculating the simulated fault data includes: The simulated fault data is analyzed and calculated using symmetrical component and network matrix methods.

4. The electromagnetic transient comprehensive modeling method suitable for real-time simulation of power grid according to claim 1, characterized in that: The method of realizing electromagnetic transient comprehensive modeling according to the accuracy of the fault simulation includes: If it is determined that the accuracy of the fault simulation reaches a preset accuracy index, electromagnetic transient comprehensive modeling is performed based on the steady-state power flow calculation result data.

5. The electromagnetic transient comprehensive modeling method suitable for real-time simulation of power grid according to claim 4 is characterized in that: The electromagnetic transient comprehensive modeling method suitable for real-time power grid simulation also includes: If it is determined that the accuracy of the fault simulation does not reach the preset accuracy index, the model parameters of the optimal power equivalent system model and / or the impedance array model are periodically optimized, and the steady-state power flow of the optimal power equivalent system model is recalculated using the power system real-time simulation software according to the optimized node correspondence after the model parameter optimization to obtain optimized steady-state power flow calculation result data; Subsequent steps are performed based on the optimized steady-state power flow calculation result data until the fault simulation accuracy reaches a preset accuracy index.

6. The electromagnetic transient comprehensive modeling method suitable for real-time simulation of power grid according to any one of claims 1 to 5, characterized in that: Before the step of determining the node correspondence between the predetermined optimal power equivalent system model and the impedance array model, the electromagnetic transient integrated modeling method suitable for real-time power grid simulation further includes: Building the electric power equivalent system model and determining the topological relationship of the electric power equivalent system model; Performing hierarchical and partitioning processing on the power equivalent system model to obtain a plurality of sub-network models under different hierarchical and partitioning modes; Performing system power flow calculations on the multiple sub-network models according to the topological relationships, and selecting an optimal sub-network mode that balances calculation efficiency and calculation accuracy according to the system power flow calculation results; The power equivalent system model under the optimal network division mode is run to obtain the optimal power equivalent system model.

7. An electromagnetic transient comprehensive modeling device suitable for real-time simulation of power grid, characterized in that: include: a calculation unit, configured to calculate the steady-state power flow of the optimal power equivalent system model using power system real-time simulation software according to a predetermined node correspondence relationship between the optimal power equivalent system model and the impedance array model, and obtain steady-state power flow calculation result data; The optimal power equivalent system model is obtained by operating the power equivalent system model in an optimal network manner based on the balance calculation efficiency and calculation accuracy; a determination unit, configured to determine typical disturbance locations and fault types of the optimal power equivalent system model based on the steady-state power flow calculation result data, and simulate the typical disturbance locations and fault types using the power system real-time simulation software to obtain simulated fault data; The modeling unit is used to analyze and calculate the simulated fault data, determine the fault simulation accuracy based on the comparison results of the analysis and calculation data with the steady-state power flow calculation data, and implement electromagnetic transient comprehensive modeling based on the fault simulation accuracy.

8. The electromagnetic transient comprehensive modeling device suitable for real-time simulation of power grid according to claim 7, characterized in that: The determining unit is specifically configured to: Analyzing the steady-state power flow calculation result data to obtain target transmission lines and target buses that have a large impact on system power flow distribution, and determining the target transmission lines and target buses as the typical disturbance locations; The fault type is determined according to the target transmission line and the target bus.

9. The electromagnetic transient comprehensive modeling device suitable for real-time simulation of power grid according to claim 7, characterized in that: The modeling unit is specifically used for: The simulated fault data is analyzed and calculated using symmetrical component and network matrix methods.

10. The electromagnetic transient comprehensive modeling device suitable for real-time simulation of power grid according to claim 7, characterized in that: The modeling unit is specifically used for: If it is determined that the accuracy of the fault simulation reaches a preset accuracy index, electromagnetic transient comprehensive modeling is performed based on the steady-state power flow calculation result data.

11. The electromagnetic transient comprehensive modeling device suitable for real-time simulation of power grid according to claim 10, characterized in that: The electromagnetic transient comprehensive modeling device suitable for real-time simulation of power grids is also used for: If it is determined that the accuracy of the fault simulation does not reach the preset accuracy index, the model parameters of the optimal power equivalent system model and / or the impedance array model are periodically optimized, and the steady-state power flow of the optimal power equivalent system model is recalculated using the power system real-time simulation software according to the optimized node correspondence after the model parameter optimization to obtain optimized steady-state power flow calculation result data; Subsequent steps are performed based on the optimized steady-state power flow calculation result data until the fault simulation accuracy reaches a preset accuracy index.

12. The electromagnetic transient comprehensive modeling device suitable for real-time simulation of a power grid according to any one of claims 7 to 11, characterized in that: Before the step of determining the node correspondence relationship between the predetermined optimal power equivalent system model and the impedance array model, the electromagnetic transient integrated modeling device suitable for real-time power grid simulation is further used to: Building the electric power equivalent system model and determining the topological relationship of the electric power equivalent system model; Performing hierarchical and partitioning processing on the power equivalent system model to obtain a plurality of sub-network models under different hierarchical and partitioning modes; Performing system power flow calculations on the multiple sub-network models according to the topological relationships, and selecting an optimal sub-network mode that balances calculation efficiency and calculation accuracy according to the system power flow calculation results; The power equivalent system model under the optimal network division mode is run to obtain the optimal power equivalent system model.

13. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

14. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

15. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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