DOI:10.35833/MPCE.2018.000722 |
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A Protection Method for Inverter-based Microgrid Using Current-only Polarity Comparison |
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Page view: 119
Net amount: 681 |
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Author:
Wang Bin1,Jing Liuming1
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Author Affiliation:
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
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Foundation: |
This work was supported by the China National Key Research and Development Program (No. 2017YFB0902802), the Science and Technology Project of State Grid Corporation of China (No. 52094017003D), and the China Postdoctoral Science Foundation (No. 2017M620777). |
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Abstract: |
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. |
Keywords: |
Distributed energy resources ; inverter ; microgrid protection ; fault current |
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Received:October 29, 2018
Online Time:2020/06/03 |
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