Electromagnetic transient simulation method, device and system for power system

Abstract

The invention provides an electromagnetic transient simulation method, device and system for a power system, and the method comprises the steps: representing the structure of a combined element of the power system through employing an impedance formula, changing an operator in a bilinear transformation mode, obtaining a transformation result, and finally determining a final simulation formula according to the transformation result, the impedance formula and a voltage formula. According to the method, the final simulation formula can be applied to the construction process of the relation curve of the voltage and the current of the power system subsequently, so that the problem that in the existing scheme, discrete components can generate more voltage nodes in electromagnetic transient calculation, the dimensionality of an admittance matrix needing to be calculated is increased, and the solving speed is low is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to an electromagnetic transient simulation method, device and system for power systems. Background Art

[0002] The new power system contains a large number of basic loads including resistors, inductors, capacitors, etc., as well as loads formed by the combination of resistors, inductors, and capacitors. There are conventional electromagnetic transient calculation methods for basic loads, but there is no universal and efficient method for combined loads. If discrete components are used to build it, the workload is very large in the context of massive loads in the new power system. In addition, in the electromagnetic transient calculation, discrete components will generate more voltage nodes, which will increase the dimension of the admittance matrix that needs to be calculated, reduce the solution speed, and make it difficult to achieve the effect of real-time simulation.

[0003] That is, in the existing scheme, discrete components will generate more voltage nodes in electromagnetic transient calculations, which will increase the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed. Summary of the invention

[0004] The main purpose of the present application is to provide a method, device and system for electromagnetic transient simulation of an electric power system, so as to at least solve the problem that in the existing solution, discrete components will generate more voltage nodes in the electromagnetic transient calculation, which will lead to an increase in the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for electromagnetic transient simulation of an electric power system is provided, the method comprising: using an impedance formula to characterize the structure of the combined elements of the electric power system; changing the operator in a bilinear transformation manner to obtain a transformation result; determining a final simulation formula based on the transformation result, the impedance formula and the voltage formula, and applying the final simulation formula to the process of constructing a relationship curve between the voltage and current of the electric power system, the voltage formula characterizing the relationship between the voltage and current and the impedance formula, and the final simulation formula characterizing the result of the electromagnetic transient simulation calculation.

[0006] Optionally, the operator is changed in a bilinear transformation manner to obtain a transformation result, including:

[0007] Perform a bilinear transformation and Get the transformation result,

[0008] Wherein, s is the s operator, z is the z operator, △t is the simulation step length, and the transformation results include and

[0009] Optionally, an impedance formula is used to characterize the structure of the combined element of the power system, including:

[0010] When the combined element of the power system is RL in series, the impedance formula is determined as:

[0011] Z = R + sL;

[0012] When the combined element of the power system is RC series, the impedance formula is determined as:

[0013]

[0014] When the combined element of the power system is LC series, the impedance formula is determined as:

[0015]

[0016] When the combined element of the power system is RLC series, the impedance formula is determined as:

[0017]

[0018] Among them, Z is impedance, s is s operator, L is inductance, C is capacitance, and R is resistance.

[0019] Optionally, determining a final simulation formula according to the transformation result, the impedance formula and the voltage formula includes:

[0020] When the combined element of the power system is RLC series, the final simulation formula is determined as:

[0021]

[0022] Among them, L is the inductance, C is the capacitance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0023] Optionally, determining a final simulation formula according to the transformation result, the impedance formula and the voltage formula includes:

[0024] When the combined element of the power system is RL in series, the final simulation formula is determined as:

[0025]

[0026] Among them, L is the inductance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0027] Optionally, determining a final simulation formula according to the transformation result, the impedance formula and the voltage formula includes:

[0028] When the combined element of the power system is RC series, the final simulation formula is determined as:

[0029]

[0030] Among them, C is the capacitance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0031] Optionally, determining a final simulation formula according to the transformation result, the impedance formula and the voltage formula includes:

[0032] When the combined element of the power system is LC series, the final simulation formula is determined as:

[0033]

[0034] Among them, L is the inductance, C is the capacitance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0035] Optionally, before adopting the impedance formula to characterize the structure of the combination element of the power system, the method further includes: obtaining a description text, the description text representing a description of a connection method of the combination element of the power system; constructing a connection method array according to the description text, the connection method array being the connection method of each resistor, each capacitor, and each inductor in the combination element, and in the process of constructing the connection method array, updating the state of the combination element stored in the database to a found state, and the state of the combination element is either a found state or a not found state.

[0036] According to another aspect of the present application, there is provided an electromagnetic transient simulation device for an electric power system, the device comprising:

[0037] A first processing unit, for characterizing the structure of the combined element of the power system using an impedance formula;

[0038] The second processing unit is used to change the operator in a bilinear transformation manner to obtain a transformation result;

[0039] The third processing unit is used to determine a final simulation formula based on the transformation result, the impedance formula and the voltage formula, and apply the final simulation formula to the process of constructing a curve of the relationship between the voltage and current of the power system, wherein the voltage formula represents the relationship between the voltage and current and the impedance formula, and the final simulation formula represents the result of the electromagnetic transient simulation calculation.

[0040] According to another aspect of the present application, an electromagnetic transient simulation system for an electric power system is provided, the system comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the described methods.

[0041] By applying the technical solution of the present application, the impedance formula is used to characterize the structure of the combined elements of the power system, and the operator is changed in a bilinear transformation manner to obtain a transformation result. Finally, the final simulation formula is determined based on the transformation result, the impedance formula and the voltage formula, so that the final simulation formula can be subsequently applied to the construction of the voltage and current relationship curve of the power system, thereby solving the problem that in the existing solution, discrete elements will generate more voltage nodes in the electromagnetic transient calculation, which in turn leads to an increase in the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0043] Figure 1 A schematic diagram of a flow chart of an electromagnetic transient simulation method for an electric power system provided according to an embodiment of the present application is shown;

[0044] Figure 2 A schematic diagram of the structure of a combination element provided according to an embodiment of the present application is shown;

[0045] Figure 3 A structural block diagram of an electromagnetic transient simulation device for an electric power system provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0049] As introduced in the background technology, the new power system contains a large number of basic loads including resistors, inductors, capacitors, etc., and also loads formed by the combination of resistors, inductors, and capacitors. There are now conventional electromagnetic transient calculation methods for basic loads, but there is no universal and efficient method for combined loads. If discrete components are used to build it, the workload is very large in the context of massive loads in the new power system. In addition, in the electromagnetic transient calculation, discrete components will generate more voltage nodes, which will increase the dimension of the admittance matrix that needs to be calculated, reduce the solution speed, and make it difficult to achieve the effect of real-time simulation. In order to solve the problem that the existing solution generates more voltage nodes in the electromagnetic transient calculation, which will increase the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed, the embodiments of the present application provide an electromagnetic transient simulation method, device, and system for a power system.

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0051] In this embodiment, a method for electromagnetic transient simulation of an electric power system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0052] Figure 1 FIG. 1 is a flow chart of an electromagnetic transient simulation method for a power system provided according to an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0053] Step S101, using an impedance formula to characterize the structure of the combined components of the above power system;

[0054] RLC series combination elements such as Figure 2 shown.

[0055] In one embodiment of the present application, an impedance formula is used to characterize the structure of the combined element of the above power system, including:

[0056] When the combined element of the power system is RL in series, the above impedance formula is determined as:

[0057] Z = R + sL;

[0058] When the combined components of the power system are RC series, the above impedance formula is determined as:

[0059]

[0060] When the combined element of the power system is LC series, the above impedance formula is determined as:

[0061]

[0062] When the combined element of the power system is RLC series, the above impedance formula is determined as:

[0063]

[0064] Among them, Z is impedance, s is s operator, L is inductance, C is capacitance, and R is resistance.

[0065] Step S102, changing the operator in a bilinear transformation manner to obtain a transformation result;

[0066] In one embodiment of the present application, the operator is changed in a bilinear transformation manner to obtain a transformation result, including:

[0067] Perform a bilinear transformation and The above transformation results are obtained.

[0068] Among them, s is the s operator, z is the z operator, △t is the simulation step size, and the above transformation results include and

[0069] Specifically, the derivation process replaces s with z, and the following formula is obtained:

[0070]

[0071] The goal is to organize it into the following form:

[0072] I=YU+f(z -1 U,z -2 U,z -2 I, z -2 I);

[0073] Among them, Y and f are sorted parameters, and their specific meanings are determined according to the final simulation formula and will not be elaborated hereafter.

[0074] Step S103, determining a final simulation formula based on the above transformation results, the above impedance formula and the voltage formula, and applying the above final simulation formula to the process of constructing a voltage and current relationship curve of the above power system, the above voltage formula characterizes the relationship between the voltage and current and the above impedance formula, and the above final simulation formula characterizes the result of the electromagnetic transient simulation calculation.

[0075] In the above steps, the impedance formula is used to characterize the structure of the combined elements of the above power system, and the operator is changed in a bilinear transformation manner to obtain a transformation result. Finally, the final simulation formula is determined based on the above transformation result, the above impedance formula and the voltage formula, so that the above final simulation formula can be subsequently applied to the construction of the voltage and current relationship curve of the above power system, thereby solving the problem that in the existing solution, discrete elements will generate more voltage nodes in the electromagnetic transient calculation, which will lead to an increase in the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed.

[0076] In one embodiment of the present application, according to the above transformation result, the above impedance formula and the voltage formula, a final simulation formula is determined, including:

[0077] When the combined element of the power system is RLC series, the above final simulation formula is determined as:

[0078]

[0079] Among them, L is the inductance, C is the capacitance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0080] Specifically, the following formula:

[0081]

[0082] After sorting, the final simulation formula can be obtained.

[0083] The effect achieved is that the original three discrete components must be represented by 4 voltage nodes, which are optimized to only require 2 voltage nodes, reducing the matrix order by 2 dimensions.

[0084] In one embodiment of the present application, according to the above transformation result, the above impedance formula and the voltage formula, a final simulation formula is determined, including:

[0085] When the combined element of the power system is RL in series, the above final simulation formula is determined as:

[0086]

[0087] Among them, L is the inductance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0088] Specifically, similarly for RL, RC, and LC, the missing component parameters can be set to 0, and rearranged, which can reduce 3 voltage nodes to 2 voltage nodes, which will not be described in detail here.

[0089] In one embodiment of the present application, according to the above transformation result, the above impedance formula and the voltage formula, a final simulation formula is determined, including:

[0090] When the combined components of the power system are RC series, the above final simulation formula is determined as:

[0091]

[0092] Among them, C is the capacitance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0093] In one embodiment of the present application, according to the above transformation result, the above impedance formula and the voltage formula, a final simulation formula is determined, including:

[0094] When the combined element of the power system is LC series, the above final simulation formula is determined as:

[0095]

[0096] Among them, L is the inductance, C is the capacitance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0097] In one embodiment of the present application, before using the impedance formula to characterize the structure of the combination element of the above-mentioned power system, the above-mentioned method also includes: obtaining a description text, the above-mentioned description text represents a description of the connection method of the combination element of the above-mentioned power system; according to the above-mentioned description text, constructing a connection method array, the above-mentioned connection method array is the connection method of each resistor, each capacitor, and each inductor in the above-mentioned combination element, and in the process of constructing the connection method array, updating the status of the above-mentioned combination element stored in the database to a found state, and the status of the above-mentioned combination element is a found state or a not found state.

[0098] Specifically, when searching for RLC combination elements connected in series in a circuit, it is possible to find several independent blocks that can be combined into a single RLC element. The search method is as follows:

[0099] Initially, all R, L, and C components in the circuit are not marked as "found".

[0100] (1) Find any resistor R1 among the components not marked as "found" in the circuit. If it cannot be found, find the inductor L1. If it still cannot be found, find the capacitor C1. If it still cannot be found, it means there is no RLC component in the circuit, and the process ends.

[0101] (2) For example, if R1 is found in the first step, set the combination M1 = {R1} and find the resistor, inductor, and capacitor connected to its two endpoints:

[0102] (2.1) If the resistor R11 is found, then update M1 = {R1 + R11}, and continue to find the resistor, inductor, and capacitor connected to the two ends of the new component after combining R1 and R11:

[0103] (2.2) If the resistor L1 is found, then update M1 = {R1, L1}, and combine R1 and L1 to form the two ends of the new component. Continue to find the resistor, inductor, and capacitor connected to the two ends of the new component:

[0104] (2.3) If the resistor C1 is found, then update M1 = {R1, C1}, and combine R1 and C1 to form the two ends of the new component. Continue to find the resistor, inductor, and capacitor connected to the two ends of the new component:

[0105] (3) Repeat the above process (2.1) to (2.3) to find the final M1 = {R 串 , L 串 , C 串}, where R 串 =R1+R11+R12…, L 串 =L1+L12+L13+…,1 / C 串 =1 / C1+1 / C12+1 / C13…, mark all discrete components in M1 as “found”.

[0106] (4) Repeat the above (1) to (3) process until all R, L, and C components in the circuit are marked as "found".

[0107] All discrete components in the circuit can be converted into combined loads. Every time a discrete component is combined, the order of the admittance matrix is ​​reduced by 1.

[0108] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0109] The embodiment of the present application also provides an electromagnetic transient simulation device for an electric power system. It should be noted that the electromagnetic transient simulation device for an electric power system of the embodiment of the present application can be used to execute the electromagnetic transient simulation method for an electric power system provided by the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and those that have been described will not be repeated here. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0110] The following is an introduction to the electromagnetic transient simulation device for the power system provided in the embodiment of the present application.

[0111] Figure 3 1 is a structural block diagram of an electromagnetic transient simulation device for a power system provided according to an embodiment of the present application. Figure 3 As shown, the device comprises:

[0112] A first processing unit 31 is used to characterize the structure of the combined element of the above power system using an impedance formula;

[0113] The second processing unit 32 is used to transform the operator in a bilinear transformation manner to obtain a transformation result;

[0114] The third processing unit 33 is used to determine the final simulation formula according to the above-mentioned transformation results, the above-mentioned impedance formula and the voltage formula, and apply the above-mentioned final simulation formula to the process of constructing the voltage and current relationship curve of the above-mentioned power system. The above-mentioned voltage formula represents the relationship between the voltage and current and the above-mentioned impedance formula, and the above-mentioned final simulation formula represents the result of the electromagnetic transient simulation calculation.

[0115] In the above-mentioned device, the impedance formula is used to characterize the structure of the combined elements of the above-mentioned power system, and the operator is changed in a bilinear transformation manner to obtain a transformation result. Finally, the final simulation formula is determined based on the above-mentioned transformation result, the above-mentioned impedance formula and the voltage formula, so that the above-mentioned final simulation formula can be subsequently applied to the construction process of the voltage and current relationship curve of the above-mentioned power system, thereby solving the problem that in the existing solution, discrete elements will generate more voltage nodes in the electromagnetic transient calculation, which will lead to an increase in the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed.

[0116] In one embodiment of the present application, the second processing unit includes a processing module,

[0117] The processing module is used to perform bilinear transformation and The above transformation results are obtained.

[0118] Among them, s is the s operator, z is the z operator, △t is the simulation step size, and the above transformation results include and

[0119] In one embodiment of the present application, the first processing unit includes a first determining module, a second determining module, a third determining module and a fourth determining module.

[0120] The first determination module is used to determine the above impedance formula as follows when the combined element of the power system is RL in series:

[0121] Z = R + sL;

[0122] The second determination module is used to determine the impedance formula as follows when the combined element of the power system is RC series:

[0123]

[0124] The third determination module is used to determine the above impedance formula as follows when the combined element of the power system is LC series:

[0125]

[0126] The fourth determination module is used to determine the impedance formula as follows when the combined element of the power system is RLC series:

[0127]

[0128] Among them, Z is impedance, s is s operator, L is inductance, C is capacitance, and R is resistance.

[0129] In one embodiment of the present application, the third processing unit includes a fifth determining module,

[0130] The fifth determination module is used to determine the above final simulation formula as follows when the combined element of the power system is RLC series:

[0131]

[0132] Among them, L is the inductance, C is the capacitance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0133] In one embodiment of the present application, the third processing unit includes a sixth processing module,

[0134] The sixth processing module is used to determine the above final simulation formula as follows when the combined element of the power system is RL series:

[0135]

[0136] Among them, L is the inductance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0137] In one embodiment of the present application, the third processing unit includes a seventh processing module,

[0138] The seventh processing module is used to determine the above final simulation formula as follows when the combined element of the power system is RC series:

[0139]

[0140] Among them, C is the capacitance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0141] In one embodiment of the present application, the third processing unit includes an eighth processing module,

[0142] The eighth processing module is used to determine the above final simulation formula as follows when the combined element of the power system is LC series:

[0143]

[0144] Among them, L is the inductance, C is the capacitance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

[0145] In one embodiment of the present application, the above-mentioned device also includes an acquisition unit and a construction unit. Before using the impedance formula to characterize the structure of the combination element of the above-mentioned power system, the acquisition unit is used to acquire a description text, and the above-mentioned description text represents a description of the connection method of the combination element of the above-mentioned power system; the construction unit is used to construct a connection method array according to the above-mentioned description text, and the above-mentioned connection method array is the connection method of each resistor, each capacitor, and each inductor in the above-mentioned combination element. In the process of constructing the connection method array, the state of the above-mentioned combination element stored in the database is updated to a found state, and the state of the above-mentioned combination element is a found state or a not found state.

[0146] The electromagnetic transient simulation device for the power system includes a processor and a memory. The first processing unit, the second processing unit, and the third processing unit are all stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0147] The processor contains a kernel, which calls the corresponding program unit from the memory. One or more kernels can be set, and the kernel parameters can be adjusted to solve the problem that the discrete components in the electromagnetic transient calculation will generate more voltage nodes, which will increase the dimension of the admittance matrix to be calculated, resulting in a slower solution speed.

[0148] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0149] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the electromagnetic transient simulation method of the power system.

[0150] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the electromagnetic transient simulation method of the power system is executed when the program is run.

[0151] An embodiment of the present invention provides a device, the device includes a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented: using an impedance formula to characterize the structure of the combined elements of the above-mentioned power system; changing the operator in a bilinear transformation manner to obtain a transformation result; determining a final simulation formula based on the above-mentioned transformation result, the above-mentioned impedance formula, and the voltage formula, and applying the above-mentioned final simulation formula to the process of constructing a curve of the relationship between the voltage and current of the above-mentioned power system, the above-mentioned voltage formula characterizes the relationship between the voltage and current and the above-mentioned impedance formula, and the above-mentioned final simulation formula characterizes the result of the electromagnetic transient simulation calculation. The device in this article can be a server, PC, PAD, mobile phone, etc.

[0152] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with at least the following method steps: using an impedance formula to characterize the structure of the combined elements of the above-mentioned power system; changing the operator in a bilinear transformation manner to obtain a transformation result; determining a final simulation formula based on the above-mentioned transformation result, the above-mentioned impedance formula and the voltage formula, and applying the above-mentioned final simulation formula to the process of constructing a voltage and current relationship curve of the above-mentioned power system, the above-mentioned voltage formula characterizes the relationship between the voltage and current and the above-mentioned impedance formula, and the above-mentioned final simulation formula characterizes the result of the electromagnetic transient simulation calculation.

[0153] The present application also provides an electromagnetic transient simulation system for an electric power system, the system comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include methods for executing any of the above methods. The impedance formula is used to characterize the structure of the combined elements of the above electric power system, and the operator is changed in a bilinear transformation manner to obtain a transformation result, and finally the final simulation formula is determined according to the transformation result, the impedance formula and the voltage formula, so that the final simulation formula can be subsequently applied to the construction process of the voltage and current relationship curve of the above electric power system, thereby solving the problem that the discrete elements in the electromagnetic transient calculation of the existing solution will generate more voltage nodes, which in turn leads to an increase in the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed.

[0154] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0155] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0156] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate 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 flowchart and / or block diagram. Figure 1A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0157] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0158] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0159] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0160] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0161] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0162] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity 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, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0163] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0164] 1) The electromagnetic transient simulation method of the power system of the present application adopts an impedance formula to characterize the structure of the combined elements of the above-mentioned power system, and changes the operator in a bilinear transformation manner to obtain a transformation result. Finally, the final simulation formula is determined based on the above-mentioned transformation result, the above-mentioned impedance formula and the voltage formula, so that the above-mentioned final simulation formula can be subsequently applied to the process of constructing the relationship curve between the voltage and current of the above-mentioned power system, thereby solving the problem that the existing solution will generate more voltage nodes in the electromagnetic transient calculation by discrete elements, which will lead to an increase in the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed.

[0165] 2) The electromagnetic transient simulation device of the power system of the present application adopts an impedance formula to characterize the structure of the combined elements of the above-mentioned power system, and changes the operator in a bilinear transformation manner to obtain a transformation result. Finally, the final simulation formula is determined based on the above-mentioned transformation result, the above-mentioned impedance formula and the voltage formula, so that the above-mentioned final simulation formula can be subsequently applied to the process of constructing the relationship curve between the voltage and current of the above-mentioned power system, thereby solving the problem that in the existing solution, discrete elements will generate more voltage nodes in the electromagnetic transient calculation, which will lead to an increase in the dimension of the admittance matrix that needs to be calculated, resulting in a slower solution speed.

[0166] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for simulating electromagnetic transient state of a power system, characterized in that: include: An impedance formula is used to characterize the structure of the combined elements of the power system; By bilinear transformation, the operator is changed to obtain the transformation result; According to the transformation result, the impedance formula and the voltage formula, a final simulation formula is determined, and the final simulation formula is applied to the process of constructing a curve of the relationship between the voltage and current of the power system. The voltage formula characterizes the relationship between the voltage and current and the impedance formula, and the final simulation formula characterizes the result of the electromagnetic transient simulation calculation.

2. The method according to claim 1, characterized in that The operator is changed in a bilinear transformation manner to obtain the transformation results, including: Perform a bilinear transformation The transformation result is obtained, wherein s is the s operator, z is the z operator, △t is the simulation step length, and the transformation result includes and 3. The method according to claim 1, characterized in that The impedance formula is used to characterize the structure of the combined elements of the power system, including: When the combined element of the power system is RL in series, the impedance formula is determined as: Z = R + sL; When the combined element of the power system is RC series, the impedance formula is determined as: When the combined element of the power system is LC series, the impedance formula is determined as: When the combined element of the power system is RLC series, the impedance formula is determined as: Among them, Z is impedance, s is s operator, L is inductance, C is capacitance, and R is resistance.

4. The method according to claim 3, characterized in that According to the transformation result, the impedance formula and the voltage formula, a final simulation formula is determined, including: When the combined element of the power system is RLC series, the final simulation formula is determined as: Among them, L is inductance, C is capacitance, R is resistance, z is z operator, I is current, U is voltage, △t is the simulation step size.

5. The method according to claim 3, characterized in that: According to the transformation result, the impedance formula and the voltage formula, a final simulation formula is determined, including: When the combined element of the power system is RL in series, the final simulation formula is determined as: Among them, L is the inductance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

6. The method according to claim 3, characterized in that According to the transformation result, the impedance formula and the voltage formula, a final simulation formula is determined, including: When the combined element of the power system is RC series, the final simulation formula is determined as: Among them, C is the capacitance, R is the resistance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

7. The method according to claim 3, characterized in that According to the transformation result, the impedance formula and the voltage formula, a final simulation formula is determined, including: When the combined element of the power system is LC series, the final simulation formula is determined as: Among them, L is the inductance, C is the capacitance, z is the z operator, I is the current, U is the voltage, and △t is the simulation step size.

8. The method according to any one of claims 1 to 7, characterized in that Before adopting the impedance formula to characterize the structure of the combined element of the power system, the method further includes: Acquire a description text, wherein the description text represents a description of a connection mode of a combination element of the power system; According to the description text, a connection mode array is constructed, wherein the connection mode array is the connection mode of each resistor, each capacitor, and each inductor in the combination element, and in the process of constructing the connection mode array, the state of the combination element stored in the database is updated to a found state, and the state of the combination element is a found state or a not found state.

9. An electromagnetic transient simulation device for an electric power system, characterized in that: include: A first processing unit, for characterizing the structure of the combined element of the power system using an impedance formula; The second processing unit is used to change the operator in a bilinear transformation manner to obtain a transformation result; The third processing unit is used to determine a final simulation formula based on the transformation result, the impedance formula and the voltage formula, and apply the final simulation formula to the process of constructing a curve of the relationship between the voltage and current of the power system, wherein the voltage formula represents the relationship between the voltage and current and the impedance formula, and the final simulation formula represents the result of the electromagnetic transient simulation calculation.

10. An electromagnetic transient simulation system for a power system, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 8.

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