Preprint Article Version 1 This version is not peer-reviewed

New Protection Scheme for Internal Fault of Multi-Microgrid

Version 1 : Received: 15 February 2017 / Approved: 16 February 2017 / Online: 16 February 2017 (09:17:26 CET)

How to cite: Zhang, F.; Mu, L.; Guo, W. New Protection Scheme for Internal Fault of Multi-Microgrid. Preprints 2017, 2017020060 (doi: 10.20944/preprints201702.0060.v1). Zhang, F.; Mu, L.; Guo, W. New Protection Scheme for Internal Fault of Multi-Microgrid. Preprints 2017, 2017020060 (doi: 10.20944/preprints201702.0060.v1).

Abstract

Multi-microgrid has many new characteristics, such as bi-directional power flows, flexible operation modes and variable fault currents with different control strategy of inverter interfaced distributed generations (IIDGs). All these featuring aspects pose challenges to multi-microgrid protection. In this paper, current and voltage characteristics of different feeders are analyzed when fault occurs in different positions of multi-microgrid. Based on the voltage and current distribution characteristics of the line parameters, a new protection scheme for the internal fault of multi-microgrid is proposed, which takes the change of phase difference and amplitude of measured bus admittance as the criterion. This scheme with high sensitivity and reliability, has a simple principle and is easy to be adjusted. PSCAD/EMTDC is used in simulation analysis, and simulation results have verified the correctness and effectiveness of the protection scheme.

Subject Areas

microgrid; multi-microgrid; measured admittance; protection scheme

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