Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 36, Issue 6, Pages 3371-3382Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2020.3039176
Keywords
Relays; Microgrids; Inverters; Discrete Fourier transforms; Frequency estimation; Steady-state; Communication channels; Microgrid; inverter-interfaced distributed energy resource; protection; communication; Back-up
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Multi-inverter microgrid systems with loop topology offer higher reliability compared to conventional systems, but communication-assisted line protection schemes still face reliability issues due to dependence on communication availability and the need for backup communication paths in case of failure, which adds to the cost concern.
Multi-inverter microgrid systems, particularly those with loop topology, offer higher power supply reliability and robustness compared to conventional radial distribution systems. In meshed systems, communication-less protection schemes have proved to be ineffective for multi-inverter microgrids due to bidirectional power flow, and limited and controlled fault currents generated by the voltage source converters interfacing the energy source to the network. This makes communication-assisted line protection schemes preferable for such systems despite the necessity for communication means. While these protection schemes are effective, their reliability depends much on the communication availability. This requires a back-up communication path in case the main one fails bringing up the cost issue that hinders their uptake. This paper proposes a novel and low-cost line protection based on directional blocking strategy that can operate as a main as well as a back-up protection to any protection scheme using communication means between the line terminals. As the main, it requires low-bandwidth communication system. As a back-up, it would share the same communication means with the main one and use those of the healthy lines when the faulted line's fails. Thus saving the cost of back-up communication system.
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