An Improved Inverse-Time Over-Current Protection Method for a Microgrid with Optimized Acceleration and Coordination

Liang Ji, Zhe Cao, Qiteng Hong, Xiao Chang, Yang Fu, Jiabing Shi, Yang Mi and Zhenkun Li
Additional contact information
Liang Ji: School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Zhe Cao: State Grid Fengyang County Power Supply Company, Fengyang 233100, China
Qiteng Hong: Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow G1 1RD, UK
Xiao Chang: State Grid Shanxi Electric Power Research Institute, Shanxi 030001, China
Yang Fu: School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Jiabing Shi: State Grid Shanghai Qingpu Power Supply Company, Shanghai 200090, China
Yang Mi: School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Zhenkun Li: School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China

Energies, 2020, vol. 13, issue 21, 1-17

Abstract: This paper presents an improved inverse-time over-current protection method based on the compound fault acceleration factor and the beetle antennae search (BAS) optimization method for a microgrid. The proposed method can not only significantly increase the operation speed of the inverse-time over-current protection but also improve the protection coordination by considering the possible influential factors in terms of microgrid operation modes, distributed generation (DG) integration status, fault types, and positions, which are marked as the most challenging problems for over-current protection of a microgrid. In this paper, a new Time Dial Setting (TDS) of inverse-time protection is developed by applying a compound fault acceleration factor, which can notably accelerate the speed of protection by using low-voltage and short-circuit impedance during the fault. In order to improve the protection coordination, the BAS algorithm is then used to optimize the protection parameters of the pick-up current, TDS, and the inverse time curve shape coefficient. Finally, case studies and various evaluations based on DIgSILENT/Power Factory are carried out to illustrate the effectiveness of the proposed method.

Keywords: microgrid; distributed generation; inverse-time over-current protection; coordination optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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