Review on Fault Management in Hybrid Microgrid

Hybrid microgrid has been evolving with bidirectional power flow for which the conventional protection schemes are insufficient as they are designed for unidirectional power flow. To run the system reliably, the protective system should be effective enough to make the system more tolerant and resilience. For protection of a system from DC faults viz., poleground and pole-pole, the advanced protection system is needed which protects system irrespective of the direction of power flow, the status of grid connection and in presence of different distributed energy resources (DERs). This paper reviews the recent development in fault management viz. fault detection, fault isolation, and restoration techniques and protective devices. Some emerging technologies like fault-tolerant generation system (FT), use of modular multilevel converter (MMC) for fault isolation and interfaced generation is discussed in detail. The paper also highlights the key challenges and suggests the future research scope in hybrid microgrid protection.