Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-Controlled Inverters

Huimin Zhao; Zhikang Shuai; Jun Ge; An Luo; Weimin Wu; Z. John Shen

doi:10.17775/CSEEJPES.2020.05210

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Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-Controlled Inverters

Regular Papers | 更新时间：2026-10-15

- Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-Controlled Inverters
- Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-Controlled Inverters
- 中国电机工程学会电力与能源系统学报(英文) 2024年10卷第2期页码：562-573
- 作者机构：
  
  1. College of Electrical and Information Engineering, Hunan University,Changsha,China
  2. Electrical Engineering Department, Shanghai Maritime University,Shanghai,China
  3. Department of Electrical and Computer Engineering, Illinois Institute of Technology,IL,Chicago,USA
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2020.05210
  中图分类号：
- 纸质出版：2024-03-01
- 稿件说明：
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Huimin Zhao, Zhikang Shuai, Jun Ge, 等. Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-Controlled Inverters[J]. 中国电机工程学会电力与能源系统学报(英文), 2024,10(2):562-573.

Huimin Zhao, Zhikang Shuai, Jun Ge, et al. Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-Controlled Inverters[J]. CSEE Journal of Power and Energy Systems, 2024, 10(2): 562-573.
Huimin Zhao, Zhikang Shuai, Jun Ge, 等. Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-Controlled Inverters[J]. 中国电机工程学会电力与能源系统学报(英文), 2024,10(2):562-573. DOI： 10.17775/CSEEJPES.2020.05210.

Huimin Zhao, Zhikang Shuai, Jun Ge, et al. Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-Controlled Inverters[J]. CSEE Journal of Power and Energy Systems, 2024, 10(2): 562-573. DOI： 10.17775/CSEEJPES.2020.05210.

摘要

Abstract

Since the fault dynamic of droop-controlled inverter is different from synchronous generators (SGs)

protection devices may become invalid

and the fault overcurrent may damage power electronic devices and threaten the safety of the microgrid. Therefore

it is imperative to conduct a comprehensive fault analysis of the inverter to guide the design of protection schemes. However

due to the complexity of droop control strategy

existing literatures have simplified asymmetric fault analysis of droop-controlled inverters to varying degrees. Therefore

accurate fault analysis of a droop-controlled inverter is needed. In this paper

by analyzing the control system

an accurate fault model is established. Based on this

a calculation method for instantaneous asymmetrical fault current is proposed. In addition

the current components and current characteristics are analyzed. It was determined that fault currents are affected by control loops

fault types

fault distance and nonlinear limiters. In particular

the influences of limiters on the fault model

fault current calculation and fault current characteristics were analyzed. Through detailed analysis

it was found that dynamics of the control loop cannot be ignored

the fault type and fault distance determine fault current level

and part of the limiters will totally change the fault current trend. Finally

calculation and experimental results verify the correctness of the proposed method.

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