电网技术2024，Vol.48Issue(7)：2967-2976,中插94-中插95,12.DOI:10.13335/j.1000-3673.pst.2023.1135
含逆变型分布式电源外电网的短路计算等值及其影响因素分析
Short-circuit Calculation Equivalent of External Power Grid Including Inverter Interfaced Distributed Generator and Analysis of Influencing Factors
摘要
Abstract
Integrating many inverter-interfaced distributed generators(IIDG)will impact the power system's calculation of short-circuit current and grid equivalence.This paper proposes a multi-port Thevenin equivalent method for an external grid with a distributed generator,and the influencing factors of equivalent parameters are analyzed.Firstly,the Thevenin equivalent circuit model and parameter expression are derived based on the theory of multi-port electrical networks.The influence of distributed generators on equivalent circuits is mainly reflected in the open-circuit equivalent voltage.Secondly,according to the formula of open circuit voltage calculation,distributed generators'influence factors and rules on open circuit equivalent voltage are analyzed.The distributed generator can be equivalent to the voltage-controlled current source,and its output current is affected by the independent voltage source,the equivalent port voltage,and the low pass control strategy of the distributed generator.Then,the effect of equivalent port voltage,the capacity of the distributed generator,and the strength of independent AC power supply on equivalent open circuit voltage is analyzed,and the variation curve of equivalent open circuit voltage with port voltage,the capacity of the distributed generator,and internal impedance of external power supply is obtained.The simulation results of the IEEE33-node power grid and 220kV high-voltage power grid verify the correctness of the equivalence method and the analysis of influencing factors.关键词
多端口戴维南等值/逆变型分布式电源/短路电流计算Key words
multi-port Thevenin equivalent/inverter interfaced distributed generator/short circuit current calculation分类
信息技术与安全科学引用本文复制引用
谢德兴,肖仕武..含逆变型分布式电源外电网的短路计算等值及其影响因素分析[J].电网技术,2024,48(7):2967-2976,中插94-中插95,12.基金项目
国网冀北公司项目"适应高比例分布式新能源接入的高可靠配电网故障处置关键技术研究与应用"(52018K230001).Project Supported by State Grid Jibei Company Project:Research and Application of Key Technologies of Reliable Distribution Network Fault Handling Adapted to High Proportion Distributed New Energy Access(52018K230001). （52018K230001）
