New protection scheme for internal fault of multi-microgrid

• Main Authors: Fan Zhang, Longhua Mu
• Format: Article
• Language: English
• Published: SpringerOpen 2019-06-01
• Series: Protection and Control of Modern Power Systems
• Subjects: Microgrid; Multi-microgrid; Measured admittance; Protection scheme
• Online Access: http://link.springer.com/article/10.1186/s41601-019-0127-3

Abstract 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.