New protection scheme for internal fault of multi-microgrid

作者：Fan Zhang, Longhua Mu · 发表于：Protection and Control of Modern Power Systems · 年份：2019 · DOI：10.1186/s41601-019-0127-3 · 被引用次数：36 · 研究领域：Islanding Detection in Power Systems、Power Systems Fault Detection、Microgrid Control and Optimization

Multi-microgrids have many new characteristics, such as bi-directional power flow, flexible operation and variable fault current consisting of the different control strategy of inverter interfaced distributed generations (IIDGs), which all present challenges in multi-microgrid protection. In this paper, the current and voltage characteristics of different feeders are analyzed considering faults at different locations of the multi-microgrid. Based on the voltage and current distribution characteristics of the line parameters, a new protection scheme for the internal faults of multi-microgrids is proposed, which takes the change of phase difference and amplitude of measured bus admittances as the criterion. This proposed scheme has high sensitivity and reliability, is based on a simple principle, and can be easily adjusted. Simulation results using PSCAD/EMTDC verify the correctness and effectiveness of the protection scheme.