A Protection Method for Inverter-based Microgrid Using Current-only Polarity Comparison

• 作者: Bin Wang Liuming Jing
• 来源期刊: 现代电力系统与清洁能源学报(英文)
• 学科: 工学
• 关键词: Distributed energy resources INVERTER microgrid protection fault current
• 年，卷（期）: 2020,（3）
• 页码范围: 446-453
• 页数: 8页
• 分类号: TN9

摘要

The design of an effective protection system for inverter-based microgrids is a complicated engineering challenge.This is due to the fact that inverters have limited fault current capabilities, and that the conventional overcurrent protection is not suitable for inverter-based microgrids. This paper introduces a novel protection method for inverter-based microgrid using a current-only polarity comparison. The proposed method is based on the phase difference between the pre-fault and fault current components. The method responds to faults in both grid-connected and autonomous operation modes and provides a new way to identify faulted sections. Simulations of an inverter-based microgrid with a relay model are conducted using PSCAD/EMTDC software. The results show that the proposed method can detect faults in inverter-based microgrids.