Power Angle Stability Analysis and Modeling Method, Device, Equipment and Readable Storage Medium

Abstract

The present application provides a power angle stability analysis and modeling method, device, equipment and readable storage medium for an AC-DC hybrid power system including three or more generating units. Taking any one of the generating units as a reference, the rotor motion equation of an equivalent single-machine infinite bus system can be constructed, and calculation methods for equivalent power angle, equivalent generator mechanical power, equivalent terminal load power and equivalent transmission electromagnetic power are proposed. It can consider situations such as DC power transmission and reception, AC-DC parallel connection, etc. According to information such as the moment of inertia and operating state of the units, the rotor motion equation of the equivalent single-machine infinite bus system is established, and the power angle stability characteristics of the reference unit are analyzed based on this equation. It can also effectively calculate the influence of DC power transmission, with fast calculation and analysis speed and high accuracy. In addition, this method can also obtain the power angle characteristic curve of the AC-DC hybrid power system, which is further advanced than the traditional power angle characteristic analysis theory and has stronger adaptability to complex power systems.

Description

Technical Field

[0001] This application relates to the technical field of power system operation and control, and particularly relates to a power angle stability analysis and modeling method, device, equipment, and readable storage medium for power grids. Background Art

[0002] Power angle stability of a power system refers to the ability of synchronous generators in the power system to maintain synchronous operation after being disturbed, also known as synchronous stability. It is an important branch of power system stability problems. According to different transient characteristics of power angles, it can be divided into static power angle stability and transient power angle stability.

[0003] Currently, the theory of power angle stability analysis for a single-machine infinite-bus system is very mature. The most widely used is the power angle characteristic curve obtained based on the rotor motion equation of the single-machine infinite-bus system, and the static and transient power angle stability characteristics of the single-machine infinite-bus system can be analyzed based on this; a two-machine system can be evolved into a single-machine infinite-bus system for processing. For a multi-machine system, on the one hand, the units can be grouped by coherency and equivalent to a two-machine system, and then further equivalent to a single-machine infinite-bus system for processing. However, considering the complex and changeable operation modes of the power grid, especially in the case of parallel long-distance power transmission of DC and AC, there may be a third coherency machine group in addition to the DC sending-end machine group and the receiving-end machine group after the units are grouped by coherency, and the analysis theory of the two-machine system cannot be directly applied. If forced to be divided into two coherency machine groups, it may cause a large analysis error and affect the conclusion of power angle stability analysis; on the other hand, the mathematical modeling of the multi-machine system can be directly carried out, and complex matrix operations, integrations and other mathematical calculations can be performed to analyze the power angle stability of the system. However, this type of method has complex modeling, slow calculation and analysis speed, and it is difficult to accurately consider the influence of DC. Summary of the Invention

[0004] This application aims to at least solve one of the above technical defects. In view of this, this application provides a power angle stability analysis and modeling method, device, equipment, and readable storage medium for power grids to solve the technical defects in the existing power angle stability analysis and modeling of power grids.

[0005] A power angle stability analysis and modeling method for a power grid includes:

[0006] Obtain a parameter set of the target power system, where the parameter set includes parameters of at least one target power system;

[0007] Construct an equivalent power angle calculation model of the equivalent single-machine infinite-bus system corresponding to the target power system according to the parameter set of the target power system;

[0008] Construct an equivalent generator mechanical power calculation model of the equivalent single-machine infinite-bus system corresponding to the target power system according to the parameter set of the target power system;

[0009] Construct an equivalent terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system;

[0010] Construct an equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system;

[0011] Construct a rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent terminal load power calculation model, and the equivalent transmission electromagnetic power calculation model.

[0012] Preferably,

[0013] The parameter set includes the voltages of each bus of the target power system, the moments of inertia of each generator connected to the bus of the target power system, the rotor power angles of each generator, and the impedances of each branch connected to the bus of the target power system. Constructing the equivalent power angle calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system includes:

[0014] Construct an equivalent power angle calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the voltages of each bus of the target power system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, and the impedances of each branch connected to the bus of the target power system.

[0015] Preferably, the parameter set further includes: the mechanical powers of each generator of the target power system. Constructing the equivalent generator mechanical power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system includes:

[0016] Construct an equivalent generator mechanical power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the voltages of each bus of the target power system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, the impedances of each branch connected to the bus of the target power system, and the mechanical powers of each generator of the target power system.

[0017] [[ID=2,5]]Preferably, the parameter set further includes: the active powers of each constant-power load connected to the bus of the target power system, the DC powers injected into each bus connected to the target power system.

[0018] Constructing an equivalent terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system includes:

[0019] Constructing an equivalent terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the voltages of each bus of the target power system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, the impedances of each branch connected to the buses of the target power system, the active powers of each constant-power load connected to the buses of the target power system, and the DC powers injected into each bus connected to the target power system.

[0020] Preferably, constructing an equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system includes:

[0021] Constructing an equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the voltages of each bus of the target power system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, and the impedances of each branch connected to the buses of the target power system.

[0022] Preferably, constructing a rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent terminal load power calculation model, and the equivalent transmission electromagnetic power calculation model includes:

[0023] Determining the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent power angle calculation model;

[0024] Determining the equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent generator mechanical power calculation model;

[0025] Determining the equivalent terminal load power of the equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent terminal load power calculation model;

[0026] Determining the equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent transmission electromagnetic power calculation model;

[0027] Construct a rotor motion parameter calculation model for the equivalent single-machine infinite bus system corresponding to the target power system based on the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the target power system, the equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the target power system, the equivalent terminal load power of the equivalent single-machine infinite bus system corresponding to the target power system, and the equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the target power system;

[0028] Among them,

[0029] The rotor motion parameter calculation model for the equivalent single-machine infinite bus system corresponding to the target power system is:

[0030]

[0031] Among them,

[0032] M represents the rotor motion parameter of the equivalent single-machine infinite bus system corresponding to the target power system, that is, the rotor motion parameter of the equivalent single-machine infinite bus system corresponding to the target power system is obtained by taking the second derivative of the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the target power system;

[0033] P M represents the equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the target power system;

[0034] P ec represents the equivalent terminal load power of the equivalent single-machine infinite bus system corresponding to the target power system;

[0035] P evm represents the equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the target power system;

[0036] θ eq1 represents the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the target power system.

[0037] Preferably, the method further includes:

[0038] Analyze the power angle stability characteristics of the target power system by using the rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the target power system.

[0039] A power grid power angle stability analysis and modeling device includes:

[0040] A parameter acquisition unit for acquiring a parameter set of a target power system, where the parameter set includes at least one parameter of the target power system;

[0041] The first construction unit is used to construct an equivalent power angle calculation model of an equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system;

[0042] The second construction unit is used to construct an equivalent generator mechanical power calculation model of an equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system;

[0043] The third construction unit is used to construct an equivalent terminal load power calculation model of an equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system;

[0044] The fourth construction unit is used to construct an equivalent transmission electromagnetic power calculation model of an equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system;

[0045] The fifth construction unit is used to construct a rotor motion parameter calculation model of an equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent terminal load power calculation model, and the equivalent transmission electromagnetic power calculation model.

[0046] A power grid power angle stability analysis and modeling device includes: one or more processors, and a memory;

[0047] Computer-readable instructions are stored in the memory, and when the computer-readable instructions are executed by the one or more processors, the steps of the power grid power angle stability analysis and modeling method described in any one of the foregoing introductions are implemented.

[0048] A readable storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors are caused to implement the steps of the power grid power angle stability analysis and modeling method described in any one of the foregoing introductions.

[0049] As can be seen from the technical solutions introduced above, the method provided by the embodiments of this application can obtain a parameter set of a target power system, where the parameter set includes parameters of at least one target power system; after determining the parameter set of the target power system, an equivalent power angle calculation model of an equivalent single-machine infinite bus system corresponding to the target power system can be further constructed based on the parameter set of the target power system; an equivalent generator mechanical power calculation model of an equivalent single-machine infinite bus system corresponding to the target power system can be constructed based on the parameter set of the target power system; an equivalent terminal load power calculation model of an equivalent single-machine infinite bus system corresponding to the target power system can be constructed based on the parameter set of the target power system; an equivalent transmission electromagnetic power calculation model of an equivalent single-machine infinite bus system corresponding to the target power system can be constructed based on the parameter set of the target power system; after determining the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent terminal load power calculation model, and the equivalent transmission electromagnetic power calculation model, a rotor motion parameter calculation model of an equivalent single-machine infinite bus system corresponding to the target power system can be further constructed based on the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent terminal load power calculation model, and the equivalent transmission electromagnetic power calculation model. So as to analyze the power angle stability problem of the target power system based on the constructed rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the target power system.

[0050] The method provided by the embodiments of this application can be applied to an AC-DC hybrid power system including three or more generator sets. Taking any one of the generator sets as a reference, the rotor motion equation of an equivalent single-machine infinite bus system can be constructed, and calculation methods for equivalent power angle, equivalent generator mechanical power, equivalent terminal load power, and equivalent transmission electromagnetic power are proposed. The method provided by the embodiments of this application can consider situations such as DC power transmission, DC power reception, and AC-DC parallel connection, and an accurate rotor motion equation of an equivalent single-machine infinite bus system can be established according to information such as the moment of inertia of the generator set, the grid structure, and the operating state. Based on this equation, the power angle stability characteristics of the reference generator set can be analyzed, and the influence of DC power transmission can also be effectively calculated. The calculation and analysis speed is fast and the accuracy is high. In addition, this method can also obtain the power angle characteristic curve of an AC-DC hybrid power system with multiple generator sets, which is further advanced than the traditional power angle characteristic analysis theory of a two-machine AC-DC system and has stronger adaptability to complex power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0052] Figure 1 It is a flowchart of a method for realizing power angle stability analysis and modeling of a power grid provided by an embodiment of the present application;

[0053] Figure 2 It is a schematic connection diagram of a three-machine AC / DC hybrid power system exemplified by an embodiment of the present application;

[0054] Figure 3 It is a schematic structural diagram of a power angle stability analysis and modeling device exemplified by an embodiment of the present application;

[0055] Figure 4 It is a hardware structure block diagram of a power angle stability analysis and modeling device disclosed by an embodiment of the present application. Specific embodiments

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0057] In the actual application process, energy resources are extremely unevenly distributed geographically, and there are power shortages in some areas. To compensate for the huge power shortages in some areas, it is necessary to adopt a large amount of long-distance DC power transmission to deliver the electric energy in the areas rich in energy resources to the load center, which may lead to situations such as multiple DCs being concentratedly fed into a certain area and DCs being connected in parallel with ACs for power transmission. In this case, the power angle stability characteristics of the power system have changed significantly due to the influence of large-scale DC power transmission, and key considerations are required in the power angle stability analysis during the power system planning, operation, and other stages.

[0058] As can be seen from the above introduction, a two-machine system can be evolved into a single-machine infinite bus system for processing. For a multi-machine system, on the one hand, the units can be grouped according to their coherence and equivalent to a two-machine system, and then further equivalent to a single-machine infinite bus system for processing. However, considering the complex and changeable operation modes of the power grid, especially in the case of parallel long-distance power transmission of DC and AC, there may be a third coherent machine group in addition to the DC sending-end machine group and the receiving-end machine group after the units are grouped according to their coherence. The analysis theory of the two-machine system cannot be directly applied. If forced to divide into two coherent machine groups, it may cause large analysis errors and affect the conclusion of the power angle stability analysis. On the other hand, the mathematical modeling of the multi-machine system can be directly carried out, and complex matrix operations, integrations and other mathematical calculations can be performed to analyze the power angle stability of the system. However, this type of method has complex modeling, slow calculation and analysis speed, and it is difficult to accurately consider the influence of DC.

[0059] In view of the fact that most of the current power angle stability analysis and modeling schemes of the power grid are difficult to adapt to the complex and changeable business requirements, the applicant has studied a power angle stability analysis and modeling for the power grid. This power angle stability analysis and modeling is applicable to the AC / DC hybrid power system containing three or more generator units. With any one of the generator units as a reference, the rotor motion equation of the equivalent single-machine infinite bus system is constructed, and the calculation methods for the equivalent power angle, the equivalent mechanical power of the generator, the equivalent load power at the machine terminal, and the equivalent transmission electromagnetic power are proposed. The method provided by the embodiment of the present application can consider the situations of DC sending, DC receiving, parallel connection of AC and DC, etc. According to the information such as the moment of inertia of the units, the grid structure, and the operation state, an accurate rotor motion equation of the equivalent single-machine infinite bus system can be established, and based on this equation, the power angle stability characteristics of the reference unit can be analyzed, and the influence of DC transmission can also be effectively calculated. The calculation and analysis speed is fast and the accuracy is high. In addition, this method can also obtain the power angle characteristic curves of the AC / DC hybrid power system of multiple generator units, which is further advanced than the traditional power angle characteristic analysis theory of the two-machine AC / DC system and has stronger adaptability to complex power systems.

[0060] The method provided by the embodiment of the present application can be used in many general or special computing device environments or configurations. For example: personal computers, server computers, handheld devices or portable devices, tablet devices, multi-processor devices, distributed computing environments including any of the above devices or equipment, etc.

[0061] The embodiment of the present application provides a power angle stability analysis and modeling method for the power grid. This method can be applied to various multi-machine AC / DC hybrid power systems, and can also be applied to various computer terminals or intelligent terminals. The execution subject can be the processor or server of the computer terminal or intelligent terminal.

[0062] The following combines Figure 1 , and introduces the process of the power angle stability analysis and modeling method given by the embodiment of the present application, as Figure 1As shown, the process may include the following steps:

[0063] Step S101, obtain a parameter set of the target power system, where the parameter set includes at least one parameter of the target power system.

[0064] Specifically, generally speaking, in the actual application process, the parameters of the power system can reflect the operating conditions of the power system.

[0065] For example, a three-machine AC / DC hybrid power system can include multiple parameters, and each parameter can reflect the operating state of the three-machine AC / DC hybrid power system.

[0066] For example, the parameters of a certain three-machine AC / DC hybrid power system can reflect the power angle stability characteristics of the three-machine AC / DC hybrid power system.

[0067] The power angle stability characteristic of the power system refers to the ability of the synchronous generators in the synchronous interconnected power system to maintain synchronous operation after being disturbed. The power angle instability of the power system is caused by insufficient synchronous torque or damping torque. Insufficient synchronous torque leads to non-periodic instability, while insufficient damping torque can lead to oscillatory instability.

[0068] The power angle stability of the power system can be further divided into static power angle stability, transient power angle stability, and dynamic power angle stability.

[0069] The target power system can be a single-machine or multi-machine AC / DC hybrid power system. For example, the target power system can be a three-machine AC / DC hybrid power system.

[0070] In order to better understand the power angle stability characteristics of the target power system, a parameter set of the target power system can be obtained. The parameter set includes at least one parameter of the target power system, and each parameter included in the parameter set of the target power system can reflect the power angle stability characteristics and the operating state of the target power system.

[0071] So as to analyze the power angle stability characteristics of the target power system based on each parameter included in the parameter set of the target power system.

[0072] Step S102, construct an equivalent power angle calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system.

[0073] Specifically, as introduced above, the method provided in the embodiments of the present application can determine the parameter set of the target power system.

[0074] The parameter set of the target power system can reflect the power angle stability characteristics of the target power system.

[0075] The power angle stability characteristics of a power system are related to the equivalent power angle of the power system.

[0076] The equivalent power angle of a power system can affect the power angle stability characteristics of the power system.

[0077] As can be seen from the above introduction, in the actual application process, generally, a multi-machine AC / DC hybrid power system can be evolved into a single-machine infinite bus system for processing.

[0078] Therefore, the equivalent power angle of the target power system can affect the power angle stability characteristics of the target power system.

[0079] In order to better understand the power angle stability characteristics of the target power system, after determining the parameter set of the target power system, an equivalent power angle calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be further constructed based on the parameter set of the target power system, so that the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the target power system can be determined according to the equivalent power angle calculation model of the equivalent single-machine infinite bus system corresponding to the target power system.

[0080] Among them, the parameter set of the target power system can include the voltages of each bus of the target power system, the moments of inertia of each generator connected to the bus of the target power system, the rotor power angles of each generator, and the impedances of each branch connected to the bus of the target power system. The process of constructing the equivalent power angle calculation model of the equivalent single-machine infinite bus system corresponding to the target power system based on the parameter set of the target power system can include the following:

[0081] An equivalent power angle calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be constructed based on the voltages of each bus of the target power system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, and the impedances of each branch connected to the bus of the target power system.

[0082] Step S103, construct an equivalent generator mechanical power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system.

[0083] Specifically, as can be seen from the above introduction, the method provided in the embodiments of the present application can determine the parameter set of the target power system.

[0084] The parameter set of the target power system can reflect the power angle stability characteristics of the target power system.

[0085] The power angle stability characteristic of the power system is related to the equivalent generator mechanical power of the power system.

[0086] The equivalent generator mechanical power of the power system can affect the power angle stability characteristic of the power system.

[0087] As can be seen from the above introduction, in the actual application process, generally, a multi-machine AC / DC hybrid power system can be evolved into a single-machine infinite bus system for processing.

[0088] Therefore, the equivalent generator mechanical power of the target power system can affect the power angle stability characteristic of the target power system.

[0089] In order to better understand the power angle stability characteristic of the target power system, after determining the parameter set of the target power system, an equivalent generator mechanical power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be further constructed according to the parameter set of the target power system, so that the equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the target power system can be determined according to the equivalent generator mechanical power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system.

[0090] Among them, the parameter set of the target power system may further include: the mechanical power of each generator of the target power system. Then, the process of constructing the equivalent generator mechanical power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system may include the following:

[0091] An equivalent generator mechanical power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be constructed according to the voltage of each bus of the target power system, the moment of inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, the impedance of each branch connected to the bus of the target power system, and the mechanical power of each generator of the target power system.

[0092] Step S104, construct an equivalent terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system.

[0093] Specifically, as can be seen from the above introduction, the method provided in the embodiments of the present application can determine the parameter set of the target power system.

[0094] The parameter set of the target power system can reflect the power angle stability characteristic of the target power system.

[0095] The power angle stability characteristic of the power system is related to the equivalent machine-terminal load power of the power system.

[0096] The equivalent machine-terminal load power of the power system can affect the power angle stability characteristic of the power system.

[0097] As can be seen from the above introduction, in the actual application process, generally, a multi-machine AC / DC hybrid power system can be evolved into a single-machine infinite bus system for processing.

[0098] Therefore, the equivalent machine-terminal load power of the target power system can affect the power angle stability characteristic of the target power system.

[0099] In order to better understand the power angle stability characteristic of the target power system, after determining the parameter set of the target power system, an equivalent machine-terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be further constructed according to the parameter set of the target power system, so that the equivalent machine-terminal load power of the equivalent single-machine infinite bus system corresponding to the target power system can be determined according to the equivalent machine-terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system.

[0100] Among them, the parameter set of the target power system may further include: the active power of each constant power load connected to the bus of the target power system, and the DC power injected into each bus connected to the target power system.

[0101] The process of constructing the equivalent machine-terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system may include the following steps:

[0102] An equivalent machine-terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be constructed according to the voltage of each bus of the target power system, the moment of inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, the impedance of each branch connected to the bus of the target power system, the active power of each constant power load connected to the bus of the target power system, and the DC power injected into each bus connected to the target power system.

[0103] Step S105, construct an equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system.

[0104] Specifically, as can be seen from the above introduction, the method provided in the embodiments of the present application can determine the parameter set of the target power system.

[0105] The parameter set of the target power system can reflect the power angle stability characteristics of the target power system.

[0106] The power angle stability characteristics of a power system are related to the equivalent transmission electromagnetic power of the power system.

[0107] The equivalent transmission electromagnetic power of a power system can affect the power angle stability characteristics of the power system.

[0108] As can be seen from the above introduction, in the actual application process, a multi-machine AC / DC hybrid power system can generally be evolved into a single-machine infinite bus system for processing.

[0109] Therefore, the equivalent transmission electromagnetic power of the target power system can affect the power angle stability characteristics of the target power system.

[0110] In order to better understand the power angle stability characteristics of the target power system, after determining the parameter set of the target power system, an equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be further constructed according to the parameter set of the target power system, so that the equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the target power system can be determined according to the equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system.

[0111] Among them,

[0112] The process of constructing the equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the parameter set of the target power system may include the following:

[0113] An equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be constructed according to the voltages of each bus of the target power system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, and the impedances of each branch connecting to the buses of the target power system.

[0114] Step S106, construct a rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent terminal load power calculation model, and the equivalent transmission electromagnetic power calculation model.

[0115] Specifically, as can be seen from the above introduction, the method provided by the embodiments of the present application can respectively construct the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent terminal load power calculation model, and the equivalent transmission electromagnetic power calculation model based on the relevant parameters in the parameter set of the target power system.

[0116] As known from the above introduction, the power angle stability characteristics of the target power system are related to the equivalent power angle, equivalent generator mechanical power, equivalent terminal load power, and equivalent transmission electromagnetic power of the target power system.

[0117] To understand the power angle stability characteristics of the target power system, the rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be created by referring to the power angle stability characteristics of the target power system and the equivalent power angle, equivalent generator mechanical power, equivalent terminal load power, and equivalent transmission electromagnetic power of the target power system. Thus, the power angle stability characteristics of the target power system can be analyzed.

[0118] For example,

[0119] The equivalent power angle of the equivalent single-machine infinite bus system corresponding to the target power system can be determined according to the equivalent power angle calculation model;

[0120] The equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the target power system can be determined according to the equivalent generator mechanical power calculation model;

[0121] The equivalent terminal load power of the equivalent single-machine infinite bus system corresponding to the target power system can be determined according to the equivalent terminal load power calculation model;

[0122] The equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the target power system can be determined according to the equivalent transmission electromagnetic power calculation model;

[0123] The rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be constructed according to the equivalent power angle, equivalent generator mechanical power, equivalent terminal load power, and equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the target power system;

[0124] Among them,

[0125] The rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the target power system can be:

[0126]

[0127] Among them,

[0128] M can represent the rotor motion parameters of the equivalent single-machine infinite bus system corresponding to the target power system, that is, the rotor motion parameters of the equivalent single-machine infinite bus system corresponding to the target power system can be obtained by taking the second derivative of the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the target power system;

[0129] P M can represent the equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the target power system;

[0130] P ec can represent the equivalent terminal load power of the equivalent single-machine infinite bus system corresponding to the target power system;

[0131] P evm can represent the equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the target power system;

[0132] θ eq1 can represent the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the target power system.

[0133] After determining the calculation model of the rotor motion parameters of the equivalent single-machine infinite bus system corresponding to the target power system, it is possible to further analyze the problem of the power angle stability characteristics of the target power system based on the rotor motion equation of the constructed equivalent single-machine infinite bus system, that is, according to the traditional power angle stability analysis theory of the single-machine infinite bus system.

[0134] As can be seen from the technical solutions introduced above, the method provided in the embodiments of the present application can be applied to an AC / DC hybrid power system including three or more generator sets. Taking any one of the generator sets as a reference, the rotor motion equation of the equivalent single-machine infinite bus system is constructed, and calculation methods for the equivalent power angle, equivalent generator mechanical power, equivalent terminal load power, and equivalent transmission electromagnetic power are proposed. The method provided in the embodiments of the present application can consider situations such as DC transmission, DC reception, and AC / DC parallel connection. Based on information such as the moment of inertia of the generator set, the grid structure, and the operating state, an accurate rotor motion equation of the equivalent single-machine infinite bus system can be established. According to this equation, the power angle stability characteristics of the reference generator set can be analyzed, and the influence of DC transmission can also be effectively calculated. The calculation and analysis speed is fast and the accuracy is high. In addition, this method can also obtain the power angle characteristic curve of an AC / DC hybrid power system with multiple generator sets, which is further advanced than the traditional power angle characteristic analysis theory of a two-machine AC / DC system and has stronger adaptability to complex power systems.

[0135] In the actual application process, after determining the calculation model of the rotor motion parameters of the equivalent single-machine infinite system corresponding to the target power system, the method provided by the embodiments of the present application can also use the calculation model of the rotor motion parameters of the equivalent single-machine infinite system corresponding to the target power system to analyze the power angle stability characteristics of the target power system.

[0136] Next, in combination with Figure 2 , taking a typical three-machine AC-DC hybrid power system as an example, the implementation process provided by the embodiments of the present application will be introduced.

[0137] This three-machine AC-DC hybrid power system is denoted as the T system.

[0138] Figure 2 The connection schematic diagram of this three-machine AC-DC hybrid power system is illustrated. It can be seen from Figure 2 that the T system has three buses, namely Bus1, Bus2, and Bus3 in Figure 2 ;

[0139] The voltages of the three buses of the T system are U1, U2, and U3 respectively;

[0140] G1, G2, and G3 are generator sets connected to the buses Bus1, Bus2, and Bus3 of the T system respectively;

[0141] The moments of inertia of the respective generators of the T system are M1, M2, and M3 respectively;

[0142] The rotor power angles of the respective generators of the T system are: θ1, θ2, and θ3;

[0143] L1, L2, and L3 are constant power loads connected to the buses Bus1, Bus2, and Bus3 of the T system respectively, and their active powers are P L1 , P L2 , P L3 respectively;

[0144] Z 12 , Z 13 , Z 23 are the branch impedances between the buses Bus1, Bus2, and Bus3 of the T system, and the active powers on each branch are P 12 , P 13 , P 23 respectively;

[0145] P dc1 , P dc2 , P dc3 are the DC powers injected into the buses Bus1, Bus2, and Bus3 respectively. Among them, the power flow directions can be seen from the arrow markings in Figure 2 .

[0146] The T-system can be used to uniformly describe AC-DC power systems in cases such as DC power transmission, DC power reception, and AC-DC parallel connection.

[0147] Based on this, the modeling process for power angle stability analysis of the T-system can include the following steps:

[0148] Step 1,

[0149] Obtain the parameter set of the T-system, where the parameter set of the T-system can include the following parameters:

[0150] The voltages of each bus of the T-system;

[0151] The moment of inertia of each generator connected to the bus of the T-system;

[0152] The rotor power angles of each generator and the impedances of each branch connected to the bus of the T-system;

[0153] The mechanical powers of each generator of the T-system;

[0154] The active powers of each constant power load connected to the bus of the T-system;

[0155] The DC powers injected into each bus connected to the T-system.

[0156] Step 2,

[0157] Construct an equivalent power angle calculation model of the equivalent single-machine infinite-bus system corresponding to the T-system according to the voltages of each bus of the T-system, the moment of inertia of each generator of the T-system, the rotor power angles of each generator of the T-system, and the impedances of each branch connected to the bus of the T-system;

[0158] Among them,

[0159] The equivalent power angle calculation model of the equivalent single-machine infinite-bus system corresponding to the T-system can be:

[0160] θ eq1T = θ1 - (Aθ2 + Bθ3)

[0161] Among them,

[0162]

[0163] B = 1 - A

[0164]

[0165]

[0166]

[0167] Among them,

[0168] θ eq1T can represent the equivalent power angle of the equivalent single-machine infinite system corresponding to the T system;

[0169] M1, M2, and M3 can respectively represent the moments of inertia of the generators of the T system;

[0170] U1, U2, and U3 can respectively represent the voltages of the busbars of the T system;

[0171] Z 12 , Z 13 , Z 23 can respectively represent the impedances of the branches of the T system.

[0172] Step 3,

[0173] Based on the voltages of the busbars of the T system, the moments of inertia of the generators of the T system, the rotor power angles of the generators of the T system, the impedances of the branches connecting to the busbars of the T system, and the mechanical powers of the generators of the T system, construct an equivalent generator mechanical power calculation model for the equivalent single-machine infinite system corresponding to the T system;

[0174] Among them,

[0175] The equivalent generator mechanical power calculation model for the equivalent single-machine infinite system corresponding to the T system is:

[0176]

[0177] Among them,

[0178]

[0179] B = 1 - A

[0180]

[0181]

[0182]

[0183] Among them,

[0184] P MT can represent the equivalent generator mechanical power of the equivalent single-machine infinite system corresponding to the T system;

[0185] M1, M2, and M3 can respectively represent the moments of inertia of the generators of the T system;

[0186] U1, U2, and U3 can respectively represent the voltages of each busbar of the T system;

[0187] Z 12 , Z 13 , Z 23 can respectively represent the impedances of each branch of the T system;

[0188] P M1 , P M2 , P M3 can respectively represent the mechanical powers of each generator of the T system.

[0189] Step 4,

[0190] Based on the voltages of each busbar of the T system, the moments of inertia of each generator of the T system, the rotor power angles of each generator of the T system, the impedances of each branch connected to the busbars of the T system, the active powers of each constant power load connected to the busbars of the T system, and the DC powers injected into each busbar connected to the T system, an equivalent machine terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the T system can be constructed; [[ID=?]]

[0191] Among them,

[0192] The equivalent machine terminal load power calculation model of the equivalent single-machine infinite bus system corresponding to the T system can be:

[0193]

[0194] Among them,

[0195]

[0196] B = 1 - A

[0197]

[0198]

[0199]

[0200] Among them,

[0201] P ecT can represent the equivalent machine terminal load power of the equivalent single-machine infinite bus system corresponding to the T system;

[0202] M1, M2, and M3 can respectively represent the moments of inertia of each generator of the T system;

[0203] U1, U2, and U3 can respectively represent the voltages of each busbar of the T system;

[0204] Z12 , Z 13 , Z 23 can respectively represent the impedances of each branch of the T system;

[0205] P L1 , P L2 , P L3 can respectively represent the active powers of each constant power load connected to the bus of the T system;

[0206] P dc1 , P dc2 , P dc3 can respectively represent the DC powers injected into each connection to the bus of the T system.

[0207] Step 5,

[0208] Based on the voltages of each bus of the T system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, and the impedances of each branch connected to the bus of the T system, an equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite-bus system corresponding to the T system can be constructed;

[0209] Among them,

[0210] The equivalent transmission electromagnetic power calculation model of the equivalent single-machine infinite-bus system corresponding to the T system is:

[0211]

[0212] Among them,

[0213]

[0214] B = 1 - A

[0215]

[0216]

[0217]

[0218] Among them,

[0219] P evmT can represent the equivalent transmission electromagnetic power of the equivalent single-machine infinite-bus system corresponding to the T system;

[0220] M1, M2, and M3 can respectively represent the moments of inertia of each generator of the T system;

[0221] U1, U2, and U3 can respectively represent the voltages of each bus of the T system;

[0222] Z 12 、 Z 13 、 Z 23 can respectively represent the impedances of each branch of the T system.

[0223] Step 6,

[0224] Based on the equivalent power angle calculation model, the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the T system can be determined;

[0225] Based on the equivalent generator mechanical power calculation model, the equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the T system can be determined;

[0226] Based on the equivalent terminal load power calculation model, the equivalent terminal load power of the equivalent single-machine infinite bus system corresponding to the T system can be determined;

[0227] Based on the equivalent transmission electromagnetic power calculation model, the equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the T system can be determined;

[0228] Based on the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the T system, the equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the T system, the equivalent terminal load power of the equivalent single-machine infinite bus system corresponding to the T system, and the equivalent transmission electromagnetic power of the equivalent single-machine infinite bus system corresponding to the T system, a rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the T system can be constructed;

[0229] Among them,

[0230] The rotor motion parameter calculation model of the equivalent single-machine infinite bus system corresponding to the T system can be:

[0231]

[0232] Among them,

[0233] M T represents the rotor motion parameter of the equivalent single-machine infinite bus system corresponding to the T system, that is, the rotor motion parameter of the equivalent single-machine infinite bus system corresponding to T is obtained by taking the second derivative of the equivalent power angle of the equivalent single-machine infinite bus system corresponding to the T system;

[0234] P MT can represent the equivalent generator mechanical power of the equivalent single-machine infinite bus system corresponding to the T system;

[0235] P ecT can represent the equivalent terminal load power of the equivalent single-machine infinite bus system corresponding to the T system;

[0236] P evmT It can represent the equivalent transmitted electromagnetic power of the equivalent single-machine infinite system corresponding to the T system;

[0237] θ eq1T It can represent the equivalent power angle of the equivalent single-machine infinite system corresponding to the T system.

[0238] After determining the rotor motion parameter calculation model of the equivalent single-machine infinite system corresponding to the T system, the power angle stability problem of the T system can be further analyzed based on the constructed rotor motion equation of the equivalent single-machine infinite system, that is, according to the traditional single-machine infinite system power angle stability analysis theory.

[0239] The following describes the power grid power angle stability analysis modeling device provided in an embodiment of the present application. The power grid power angle stability analysis modeling device described below and the power grid power angle stability analysis modeling method described above can be referenced to each other.

[0240] See also Figure 3 , Figure 3 This is a schematic structural diagram of a power grid power angle stability analysis modeling device disclosed in an embodiment of the present application.

[0241] like Figure 3 As shown, the power grid power angle stability analysis modeling device may include:

[0242] A parameter acquisition unit 101 is configured to acquire a parameter set of a target power system, wherein the parameter set includes at least one parameter of the target power system;

[0243] A first constructing unit 102 is configured to construct an equivalent power angle calculation model of an equivalent single-machine infinite system corresponding to the target power system based on a parameter set of the target power system;

[0244] A second constructing unit 103 is configured to construct an equivalent generator mechanical power calculation model of an equivalent single-machine infinite system corresponding to the target power system according to the parameter set of the target power system;

[0245] The third constructing unit 104 is configured to construct an equivalent machine-end load power calculation model of an equivalent single-machine infinite system corresponding to the target power system according to the parameter set of the target power system;

[0246] A fourth constructing unit 105 is configured to construct an equivalent transmission electromagnetic power calculation model of an equivalent single-machine infinite system corresponding to the target power system according to the parameter set of the target power system;

[0247] The fifth construction unit 106 is configured to construct a rotor motion parameter calculation model of an equivalent single-machine infinite bus system corresponding to the target power system according to the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent terminal load power calculation model, and the equivalent transmission electromagnetic power calculation model.

[0248] As can be seen from the technical solutions introduced above, the device provided in the embodiments of the present application can be applied to an AC / DC hybrid power system including three or more generator sets. With any one of the generator sets as a reference, the rotor motion equation of an equivalent single-machine infinite bus system can be constructed, and calculation methods for equivalent power angle, equivalent generator mechanical power, equivalent terminal load power, and equivalent transmission electromagnetic power are proposed. The device provided in the embodiments of the present application can consider situations such as DC transmission, DC reception, and AC / DC parallel connection. Based on information such as the moment of inertia of the units, the network structure, and the operating state, an accurate rotor motion equation of the equivalent single-machine infinite bus system can be established. According to this equation, the power angle stability characteristics of the reference unit can be analyzed, the influence of DC transmission can be effectively calculated, and the calculation and analysis speed is fast and the accuracy is high. In addition, this method can also obtain the power angle characteristic curves of an AC / DC hybrid power system with multiple generator sets, which is further advanced than the traditional power angle characteristic analysis theory of a two-machine AC / DC system and has stronger adaptability to complex power systems.

[0249] Further optionally, the parameter set includes the voltages of each bus of the target power system, the moments of inertia of each generator connected to the bus of the target power system, the rotor power angles of each generator, and the impedances of each branch connected to the bus of the target power system. The execution process of the first construction unit 102 may include:

[0250] Construct an equivalent power angle calculation model of an equivalent single-machine infinite bus system corresponding to the target power system according to the voltages of each bus of the target power system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, and the impedances of each branch connected to the bus of the target power system.

[0251] Further optionally, the parameter set may further include: the mechanical powers of each generator of the target power system. The execution process of the second construction unit 103 may include:

[0252] Construct an equivalent generator mechanical power calculation model of an equivalent single-machine infinite bus system corresponding to the target power system according to the voltages of each bus of the target power system, the moments of inertia of each generator of the target power system, the rotor power angles of each generator of the target power system, the impedances of each branch connected to the bus of the target power system, and the mechanical powers of each generator of the target power system.

[0253] Further optionally, the parameter set may further include: the active power of each constant power load connected to the bus of the target power system, and the DC power injected into each bus connected to the target power system.

[0254] The execution process of the third construction unit 104 may include:

[0255] Construct an equivalent machine - terminal load power calculation model of the equivalent single - machine infinite - bus system corresponding to the target power system according to the voltage of each bus of the target power system, the moment of inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, the impedance of each branch connected to the bus of the target power system, the active power of each constant power load connected to the bus of the target power system, and the DC power injected into each bus connected to the target power system.

[0256] Further optionally, the execution process of the fourth construction unit 105 may include:

[0257] Construct an equivalent transmission electromagnetic power calculation model of the equivalent single - machine infinite - bus system corresponding to the target power system according to the voltage of each bus of the target power system, the moment of inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, and the impedance of each branch connected to the bus of the target power system.

[0258] Further optionally, the fifth construction unit 106 may include:

[0259] A first calculation unit for determining the equivalent power angle of the equivalent single - machine infinite - bus system corresponding to the target power system according to the equivalent power angle calculation model;

[0260] A second calculation unit for determining the equivalent generator mechanical power of the equivalent single - machine infinite - bus system corresponding to the target power system according to the equivalent generator mechanical power calculation model;

[0261] A third calculation unit for determining the equivalent machine - terminal load power of the equivalent single - machine infinite - bus system corresponding to the target power system according to the equivalent machine - terminal load power calculation model;

[0262] A fourth calculation unit for determining the equivalent transmission electromagnetic power of the equivalent single - machine infinite - bus system corresponding to the target power system according to the equivalent transmission electromagnetic power calculation model;

[0263] A fifth calculation unit, configured to construct a rotor motion parameter calculation model of the equivalent single-machine infinite-bus system corresponding to the target power system according to the equivalent power angle of the equivalent single-machine infinite-bus system corresponding to the target power system, the equivalent generator mechanical power of the equivalent single-machine infinite-bus system corresponding to the target power system, the equivalent terminal load power of the equivalent single-machine infinite-bus system corresponding to the target power system, and the equivalent transmission electromagnetic power of the equivalent single-machine infinite-bus system corresponding to the target power system;

[0264] Among them,

[0265] The rotor motion parameter calculation model of the equivalent single-machine infinite-bus system corresponding to the target power system is:

[0266]

[0267] Among them,

[0268] M represents the rotor motion parameter of the equivalent single-machine infinite-bus system corresponding to the target power system, that is, the rotor motion parameter of the equivalent single-machine infinite-bus system corresponding to the target power system is obtained by taking the second derivative of the equivalent power angle of the equivalent single-machine infinite-bus system corresponding to the target power system;

[0269] P M can represent the equivalent generator mechanical power of the equivalent single-machine infinite-bus system corresponding to the target power system;

[0270] P ec can represent the equivalent terminal load power of the equivalent single-machine infinite-bus system corresponding to the target power system;

[0271] P evm can represent the equivalent transmission electromagnetic power of the equivalent single-machine infinite-bus system corresponding to the target power system;

[0272] θ eq1 can represent the equivalent power angle of the equivalent single-machine infinite-bus system corresponding to the target power system.

[0273] Further optionally, the device may further include:

[0274] An analysis unit, configured to analyze the power angle stability characteristic of the target power system by using the rotor motion parameter calculation model of the equivalent single-machine infinite-bus system corresponding to the target power system.

[0275] Among them, for the specific processing procedures of each unit included in the above power grid power angle stability analysis and modeling device, reference can be made to the relevant introduction in the previous part of the power grid power angle stability analysis and modeling method, which will not be elaborated here.

[0276] The power angle stability analysis and modeling device provided by the embodiments of this application can be applied to power angle stability analysis and modeling equipment for power grids, such as terminals: mobile phones, computers, etc. Optionally, Figure 4 shows a hardware structure block diagram of the power angle stability analysis and modeling equipment for power grids. Referring to Figure 4 , the hardware structure of the power angle stability analysis and modeling equipment for power grids may include: at least one processor 1, at least one communication interface 2, at least one memory 3, and at least one communication bus 4.

[0277] In the embodiments of this application, the number of the processor 1, the communication interface 2, the memory 3, and the communication bus 4 is at least one, and the processor 1, the communication interface 2, and the memory 3 complete mutual communication through the communication bus 4.

[0278] The processor 1 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of this application, etc.;

[0279] The memory 3 may include a high-speed RAM memory, and may also include a non-volatile memory, etc., such as at least one disk memory;

[0280] Among them, the memory stores a program, and the processor can call the program stored in the memory. The program is used to: implement each processing flow in the aforementioned terminal power angle stability analysis and modeling solution.

[0281] The embodiments of this application also provide a readable storage medium. The storage medium can store a program suitable for execution by a processor. The program is used to: implement each processing flow in the aforementioned terminal in the power angle stability analysis and modeling solution.

[0282] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0283] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other.

[0284] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. The various embodiments can be combined with each other. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power grid power angle stability analysis modeling method, characterized in that: include: Acquire a parameter set of a target power system, wherein the parameter set includes at least one parameter of the target power system; Constructing an equivalent power angle calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system; Constructing an equivalent generator mechanical power calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system; Constructing an equivalent machine-end load power calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system; Based on the parameter set of the target power system, construct an equivalent transmission electromagnetic power calculation model of an equivalent single-machine infinite system corresponding to the target power system; Constructing a rotor motion parameter calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent machine-end load power calculation model, and the equivalent transmission electromagnetic power calculation model; The parameter set includes the voltage of each busbar of the target power system, the rotational inertia of each generator connected to the busbar of the target power system, the rotor power angle of each generator, and the impedance of each branch connected to the busbar of the target power system; and constructing the equivalent power angle calculation model of the equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system includes: constructing the equivalent power angle calculation model of the equivalent single-machine infinite system corresponding to the target power system based on the voltage of each busbar of the target power system, the rotational inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, and the impedance of each branch connected to the busbar of the target power system.

2. The method according to claim 1, characterized in that The parameter set further includes: the mechanical power of each generator of the target power system. The construction of an equivalent generator mechanical power calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system includes: An equivalent generator mechanical power calculation model of an equivalent single-machine infinite system corresponding to the target power system is constructed based on the voltage of each busbar of the target power system, the rotational inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, the impedance of each branch connected to the busbar of the target power system, and the mechanical power of each generator of the target power system.

3. The method according to claim 1, characterized in that The parameter set further includes: active power of each constant power load connected to the busbar of the target power system, and each DC power injected into the busbar connected to the target power system. The step of constructing an equivalent machine-end load power calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system includes: An equivalent machine-end load power calculation model of an equivalent single-machine infinite system corresponding to the target power system is constructed based on the voltage of each busbar of the target power system, the rotational inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, the impedance of each branch connected to the busbar of the target power system, the active power of each constant power load connected to the busbar of the target power system, and the DC power injected into the busbar connected to the target power system.

4. The method according to claim 1, wherein The step of constructing an equivalent transmission electromagnetic power calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system includes: An equivalent transmission electromagnetic power calculation model of an equivalent single-machine infinite system corresponding to the target power system is constructed based on the voltage of each busbar of the target power system, the rotational inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, and the impedance of each branch connected to the busbar of the target power system.

5. The method according to any one of claims 1 to 4, characterized in that The method of constructing a rotor motion parameter calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent machine-end load power calculation model, and the equivalent transmission electromagnetic power calculation model includes: Determining the equivalent power angle of an equivalent single-machine infinite system corresponding to the target power system based on the equivalent power angle calculation model; Determining the equivalent generator mechanical power of an equivalent single-machine infinite system corresponding to the target power system based on the equivalent generator mechanical power calculation model; Determining the equivalent machine-end load power of the equivalent single-machine infinite system corresponding to the target power system according to the equivalent machine-end load power calculation model; Determining the equivalent transmitted electromagnetic power of an equivalent single-machine infinite system corresponding to the target power system based on the equivalent transmitted electromagnetic power calculation model; Constructing a rotor motion parameter calculation model of the equivalent single-machine infinite system corresponding to the target power system based on the equivalent power angle of the equivalent single-machine infinite system corresponding to the target power system, the equivalent generator mechanical power of the equivalent single-machine infinite system corresponding to the target power system, the equivalent machine-end load power of the equivalent single-machine infinite system corresponding to the target power system, and the equivalent transmitted electromagnetic power of the equivalent single-machine infinite system corresponding to the target power system; in, The rotor motion parameter calculation model of the equivalent single-machine infinite system corresponding to the target power system is: ； in, represents the rotor motion parameters of the equivalent single-machine infinite system corresponding to the target power system, that is, the rotor motion parameters of the equivalent single-machine infinite system corresponding to the target power system are obtained by twice derivatizing the equivalent power angle of the equivalent single-machine infinite system corresponding to the target power system; represents the equivalent generator mechanical power of the equivalent single-machine infinite system corresponding to the target power system; represents the equivalent machine-end load power of the equivalent single-machine infinite system corresponding to the target power system; represents the equivalent transmitted electromagnetic power of the equivalent single-machine infinite system corresponding to the target power system; It represents the equivalent power angle of the equivalent single-machine infinite system corresponding to the target power system.

6. The method according to claim 1, characterized in that The method further includes: The power angle stability characteristics of the target power system are analyzed by using a rotor motion parameter calculation model of an equivalent single-machine infinite system corresponding to the target power system.

7. A power grid power angle stability analysis modeling device, characterized in that: include: a parameter acquisition unit, configured to acquire a parameter set of a target power system, wherein the parameter set includes at least one parameter of the target power system; A first constructing unit is configured to construct an equivalent power angle calculation model of an equivalent single-machine infinite system corresponding to the target power system based on a parameter set of the target power system; A second construction unit is configured to construct an equivalent generator mechanical power calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system; A third construction unit is configured to construct an equivalent machine-end load power calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system; A fourth constructing unit is configured to construct an equivalent transmission electromagnetic power calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the parameter set of the target power system; a fifth constructing unit, configured to construct a rotor motion parameter calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the equivalent power angle calculation model, the equivalent generator mechanical power calculation model, the equivalent machine-end load power calculation model, and the equivalent transmission electromagnetic power calculation model; The parameter set includes the voltage of each bus of the target power system, the rotational inertia of each generator connected to the bus of the target power system, the rotor power angle of each generator, and the impedance of each branch connected to the bus of the target power system; the execution process of the first construction unit includes: constructing an equivalent power angle calculation model of an equivalent single-machine infinite system corresponding to the target power system based on the voltage of each bus of the target power system, the rotational inertia of each generator of the target power system, the rotor power angle of each generator of the target power system, and the impedance of each branch connected to the bus of the target power system.

8. A power grid power angle stability analysis modeling device, characterized in that: include: one or more processors, and memory; The memory stores computer-readable instructions, which, when executed by the one or more processors, implement the steps of the grid power angle stability analysis and modeling method according to any one of claims 1 to 6.

9. A readable storage medium, characterized in that: The readable storage medium stores computer-readable instructions, which, when executed by one or more processors, enable the one or more processors to implement the steps of the grid power angle stability analysis modeling method as described in any one of claims 1 to 6.

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