基于变流器控制策略的微电网故障特性仿真研究

康晴; 罗奕; 卢新佳; 高鹏

引用本文:	康晴,罗奕,卢新佳,等.基于变流器控制策略的微电网故障特性仿真研究[J].电力系统保护与控制,2019,47(2):147-153.
	KANG Qing,LUO Yi,LU Xinjia,et al.Simulation study on microgrid fault characteristics based on converters control strategy[J].Power System Protection and Control,2019,47(2):147-153

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基于变流器控制策略的微电网故障特性仿真研究
康晴¹,罗奕^1,2,卢新佳¹,高鹏¹
(1.桂林电子科技大学机电工程学院，广西桂林 541004; 2.广西制造系统与先进制造技术重点实验室，广西桂林 541004)

摘要:

微电网中分布式电源(Distributed Generators, DG)变流器的控制策略不同，可能导致不同的故障特征，进而影响保护的配置。为此，对DG变流器的下垂控制策略和虚拟同步机(Virtual Synchronous Generator, VSG)控制策略的特性进行比较分析。并针对一种简化的微电网等效模型，用Matlab/Simulink分别对各种条件下的故障特性进行仿真研究。对仿真结果进行比较表明，DG采取不同的控制策略时，微电网故障时在短路电流幅值变化、暂态过电压持续时间、故障后系统保持稳定等方面均有不同特点。研究结果可为微电网的保护配置提供相应的参考。

关键词: 微电网控制策略虚拟同步机下垂控制故障特性

DOI：10.7667/PSPC180040

分类号:

基金项目:广西科技计划项目资助(桂科AC16380041)

Simulation study on microgrid fault characteristics based on converters control strategy

KANG Qing¹,LUO Yi^1,2,LU Xinjia¹,GAO Peng¹

(1. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China;2. Guangxi’s Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology, Guilin 541004, China)

Abstract:

There are various Distributed Generators (DG) converters with different control strategies in a practical microgrid, which may lead to different fault characteristics and protection configuration. Therefore, the characteristics of the droop control strategy and the Virtual Synchronous Generator (VSG) control strategy are compared. On this basis, a simplified equivalent microgrid model is analyzed with Matlab/Simulink simulation under different fault conditions. The results show that different control strategies of DG converters will cause different fault characteristics when short-circuits happen in microgrid. The differences appear in many aspects, that is, the short circuit current amplitude variation, transient overvoltage duration, and the stable level after short-circuit. The study provides corresponding references for relay protection configuration of microgrid. This work is supported by Guangxi Science and Technology Project (No. AC16380041).

Key words: microgrid control strategy virtual synchronous generator droop control fault characteristic

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