CN-121981047-A - Electromagnetic transient simulation method, system, equipment and medium

CN121981047ACN 121981047 ACN121981047 ACN 121981047ACN-121981047-A

Abstract

The invention discloses an electromagnetic transient simulation method, an electromagnetic transient simulation system, electromagnetic transient simulation equipment and an electromagnetic transient simulation medium, which are applied to the technical field of flexible direct current transmission and comprise the steps of acquiring capacitance data of each submodule in a converter valve in an electromagnetic transient simulation process; the method comprises the steps of obtaining capacitance data of a user, obtaining a state monitoring model of each sub-module, obtaining variable resistance data of each sub-module, constructing the state monitoring model of each sub-module according to a state analysis result of each sub-module, wherein the state monitoring model is designed to reflect charge-discharge dynamic characteristics of a put-in state group, equivalent output voltage characteristics of a bypass state group and equivalent high impedance characteristics of a dead zone state group, inputting the variable resistance data into the corresponding state monitoring model to obtain corresponding output voltage data, fusing all the output voltage data to obtain bridge arm voltage, carrying out resonance risk assessment based on the bridge arm voltage, and dynamically adjusting a simulation process according to a risk assessment result. The method improves the precision and efficiency of electromagnetic transient simulation.

Inventors

LI MING
WANG YINGXIN
ZHAO SHUJING
MENG YU
LIU ZHAORU
HUANG CAOWEI
Yin Congqi
LI JIAXUN
LIU KEXIN
FU ZIYU
CHANG ZEZHOU
YUAN BIN
BO LIMING
BAO YUESHUANG
ZHAO ZHENG
LI TAN
PU YING
GUO YONGFAN
ZHOU BANGHAO
LI ZHICHUANG
SUN JINPING

Assignees

国网经济技术研究院有限公司
国网山西省电力有限公司电力科学研究院

Dates

Publication Date: 20260505
Application Date: 20251226

Claims (12)

1. An electromagnetic transient simulation method, comprising: In the electromagnetic transient simulation process, capacitance data of each submodule in the converter valve are obtained; based on an equivalent circuit model, each capacitance data is equivalent to corresponding variable resistance data, wherein the equivalent circuit model is constructed by a Norton equivalent circuit with a damping term; According to the state analysis results of the sub-modules, a state monitoring model of each sub-module is constructed, wherein the state monitoring model is designed to reflect the charge-discharge dynamic characteristics of the input state group, the equivalent output voltage characteristics of the bypass state group and the equivalent high-impedance characteristics of the dead zone state group; inputting the variable resistance data into the corresponding state monitoring model to obtain corresponding output voltage data, and fusing all the output voltage data to obtain bridge arm voltage; and carrying out resonance risk assessment based on the bridge arm voltage, and dynamically adjusting a simulation process according to a risk assessment result.
2. The electromagnetic transient simulation method of claim 1, wherein the risk assessment results comprise a first result or a second result; The step of carrying out resonance risk assessment based on the bridge arm voltage and dynamically adjusting the simulation process according to the risk assessment result comprises the following steps: analyzing the bridge arm voltage to obtain a high-frequency harmonic component; The first result indicates that when the high-frequency harmonic component exceeds a first threshold value, the converter valve is judged to be in a high-risk state, the simulation step length is reduced to a first appointed value, and a resonance early warning signal is sent to a converter valve control system; and the second result indicates that when the high-frequency harmonic component exceeds a second threshold value, the converter valve is judged to be in a low-risk stable state, the simulation step length is increased to a second designated value, a simulation acceleration signal is sent to a converter valve control system, and the first threshold value is larger than the second threshold value.
3. The electromagnetic transient simulation method of claim 2, wherein the equivalent circuit model-based equivalent circuit model equivalent each of the capacitance data to corresponding variable resistance data comprises: Constructing the equivalent circuit model based on a preset damping coefficient; Acquiring the capacitance data of each sub-module, wherein the capacitance data comprises capacitance values of each sub-module; and inputting the current simulation step length and the capacitance data into the equivalent circuit model to obtain the corresponding variable resistance data.
4. The electromagnetic transient simulation method of claim 1, wherein constructing a state monitoring model of each sub-module according to a state analysis result of each sub-module comprises: Dividing the submodule in the input state into input state groups, constructing a first monitoring model, and obtaining the charge-discharge dynamic characteristics of the input state groups based on the first monitoring model; dividing the submodule in a bypass state into a bypass state group, constructing a second monitoring model, and obtaining the equivalent output voltage characteristic of the bypass state group based on the second monitoring model; Dividing the submodules in the dead zone state into dead zone state groups, constructing a third monitoring model, and obtaining the equivalent high-impedance characteristic of the dead zone state groups based on the third monitoring model.
5. The electromagnetic transient simulation method of claim 4, wherein inputting the variable resistance data into the corresponding state monitoring model to obtain corresponding output voltage data, fusing all the output voltage data to obtain bridge arm voltages, comprises: Inputting the variable resistance data of each sub-module of the input state group into the state monitoring model based on the charge-discharge dynamic characteristics to obtain corresponding first output voltage; inputting the variable resistance data of each sub-module of the bypass state group into the state monitoring model based on the equivalent output voltage characteristics to obtain a corresponding second output voltage; Inputting the variable resistance data of each sub-module of the dead zone state group into the state monitoring model based on the equivalent high impedance characteristic to obtain a corresponding third output voltage; and carrying out fusion processing on the first output voltage, the second output voltage and the third output voltage to obtain the bridge arm voltage.
6. An electromagnetic transient simulation system, comprising: The data acquisition module is used for acquiring capacitance data of each submodule in the converter valve in the electromagnetic transient simulation process; The equivalent processing module is used for equivalent each capacitance data into corresponding variable resistance data based on an equivalent circuit model, wherein the equivalent circuit model is constructed by a Norton equivalent circuit with a damping term; The model construction module is used for constructing a state monitoring model of each sub-module according to the state analysis result of each sub-module, wherein the state monitoring model is designed to reflect the charge-discharge dynamic characteristics of the input state group, the equivalent output voltage characteristics of the bypass state group and the equivalent high-impedance characteristics of the dead zone state group; The data fusion module is used for inputting the variable resistance data into the corresponding state monitoring model to obtain corresponding output voltage data, and fusing all the output voltage data to obtain bridge arm voltage; and the risk assessment module is used for carrying out resonance risk assessment based on the bridge arm voltage and dynamically adjusting the simulation process according to the risk assessment result.
7. The electromagnetic transient simulation system of claim 6, wherein the risk assessment results comprise a first result or a second result; The risk assessment module comprises: The data analysis unit is used for analyzing the bridge arm voltage to obtain a high-frequency harmonic component; the first result unit is used for indicating that the converter valve is in a high risk state when the high-frequency harmonic component exceeds a first threshold value, reducing the simulation step length to a first specified value and sending a resonance early warning signal to a converter valve control system, or; And the second result unit is used for indicating that the converter valve is in a low-risk stable state when the high-frequency harmonic component exceeds a second threshold value, increasing the simulation step length to a second designated value, and sending a simulation acceleration signal to a converter valve control system, wherein the first threshold value is larger than the second threshold value.
8. The electromagnetic transient simulation system of claim 7, wherein the equivalent processing module comprises: The model construction unit is used for constructing the equivalent circuit model based on a preset damping coefficient; the data acquisition unit is used for acquiring the capacitance data of each sub-module, wherein the capacitance data comprises capacitance values of each sub-module; and the equivalent transformation unit is used for inputting the current simulation step length and the capacitance data into the equivalent circuit model to obtain the corresponding variable resistance data.
9. The electromagnetic transient simulation system of claim 6, wherein the model building module comprises: The first monitoring model unit is used for dividing the submodules in the input state into input state groups, constructing a first monitoring model and obtaining the charge-discharge dynamic characteristics of the input state groups based on the first monitoring model; the second monitoring model unit is used for dividing the submodule in the bypass state into bypass state groups, constructing a second monitoring model and obtaining the equivalent output voltage characteristics of the bypass state groups based on the second monitoring model; and the third monitoring model unit is used for dividing the submodules in the dead zone state into dead zone state groups, constructing a third monitoring model and obtaining the equivalent high-impedance characteristic of the dead zone state groups based on the third monitoring model.
10. The electromagnetic transient simulation system of claim 6, wherein the data fusion module comprises: the first output voltage module is used for inputting the variable resistance data of each sub-module of the input state group into the state monitoring model based on the charge-discharge dynamic characteristics to obtain corresponding first output voltage; The second output voltage module is used for inputting the variable resistance data of each sub-module of the bypass state group into the state monitoring model based on the equivalent output voltage characteristics to obtain a corresponding second output voltage; the third output voltage module is used for inputting the variable resistance data of each sub-module of the dead zone state group into the state monitoring model based on the equivalent high impedance characteristic to obtain a corresponding third output voltage; and the fusion unit is used for carrying out fusion processing on the first output voltage, the second output voltage and the third output voltage to obtain the bridge arm voltage.
11. An electromagnetic transient simulation device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing an electromagnetic transient simulation method according to any of claims 1 to 5 when executing the computer program.
12. A computer readable storage medium, wherein the computer readable storage medium stores a computer program, and wherein the device in which the computer readable storage medium is located implements an electromagnetic transient simulation method according to any one of claims 1 to 5 when the computer program is executed by the device.

Description

Electromagnetic transient simulation method, system, equipment and medium Technical Field The invention relates to the technical field of flexible direct current transmission, in particular to an electromagnetic transient simulation method, an electromagnetic transient simulation system, electromagnetic transient simulation equipment and electromagnetic transient simulation media. Background The modularized multi-level converter (Modular Multilevel Converter, MMC) has become core equipment in the field of high-voltage direct-current transmission due to the advantages of high output waveform quality, easy expansion of modularized structure and the like. In the prior art, in order to improve electromagnetic transient simulation efficiency, a converter valve is generally regarded as an idealized integral functional unit, a voltage value is directly and equivalently processed into a bridge arm voltage, but a plurality of submodules exist in the converter valve, and the submodules have different running states. Disclosure of Invention The invention provides an electromagnetic transient simulation method, an electromagnetic transient simulation system, electromagnetic transient simulation equipment and an electromagnetic transient simulation medium, which are used for solving the technical problem that the resonance risk of a converter valve cannot be accurately captured in the electromagnetic transient simulation process, so as to realize the effect of efficient and accurate electromagnetic transient simulation. In order to solve the above technical problems, an embodiment of the present invention provides an electromagnetic transient simulation method, including: In the electromagnetic transient simulation process, capacitance data of each submodule in the converter valve are obtained; based on an equivalent circuit model, each capacitance data is equivalent to corresponding variable resistance data, wherein the equivalent circuit model is constructed by a Norton equivalent circuit with a damping term; According to the state analysis results of the sub-modules, a state monitoring model of each sub-module is constructed, wherein the state monitoring model is designed to reflect the charge-discharge dynamic characteristics of the input state group, the equivalent output voltage characteristics of the bypass state group and the equivalent high-impedance characteristics of the dead zone state group; inputting the variable resistance data into the corresponding state monitoring model to obtain corresponding output voltage data, and fusing all the output voltage data to obtain bridge arm voltage; and carrying out resonance risk assessment based on the bridge arm voltage, and dynamically adjusting a simulation process according to a risk assessment result. As one preferable scheme, the risk assessment result comprises a first result or a second result; The step of carrying out resonance risk assessment based on the bridge arm voltage and dynamically adjusting the simulation process according to the risk assessment result comprises the following steps: analyzing the bridge arm voltage to obtain a high-frequency harmonic component; The first result indicates that when the high-frequency harmonic component exceeds a first threshold value, the converter valve is judged to be in a high-risk state, the simulation step length is reduced to a first appointed value, and a resonance early warning signal is sent to a converter valve control system; and the second result indicates that when the high-frequency harmonic component exceeds a second threshold value, the converter valve is judged to be in a low-risk stable state, the simulation step length is increased to a second designated value, a simulation acceleration signal is sent to a converter valve control system, and the first threshold value is larger than the second threshold value. As one preferable mode, the equivalent circuit model is used for equivalent of each capacitance data into corresponding variable resistance data, and the method comprises the following steps: Constructing the equivalent circuit model based on a preset damping coefficient; Acquiring the capacitance data of each sub-module, wherein the capacitance data comprises capacitance values of each sub-module; and inputting the current simulation step length and the capacitance data into the equivalent circuit model to obtain the corresponding variable resistance data. As one preferable solution, the constructing a state monitoring model of each sub-module according to the state analysis result of each sub-module includes: Dividing the submodule in the input state into input state groups, constructing a first monitoring model, and obtaining the charge-discharge dynamic characteristics of the input state groups based on the first monitoring model; dividing the submodule in a bypass state into a bypass state group, constructing a second monitoring model, and obtaining the equivalent output voltage character