A Systematic Review of Resilience Strategies in Active Distribution Networks

This paper presents a comprehensive review of microgrid architectures and the control strategies employed for various power converters. A microgrid can be described as an integrated system comprising distributed energy resources (DERs), energy storage units, and electrical loads. This innovative framework harnesses the capabilities of distributed generation technologies. In an AC microgrid, alternating current-based sources such as wind turbines are integrated along with DC-based sources like photovoltaic systems and fuel cells through inverters. Conversely, in a DC microgrid, AC sources must first be rectified to DC, while DC sources can be directly incorporated. To eliminate the inefficiencies caused by repetitive AC–DC–AC or DC–AC–DC conversions in standalone AC or DC microgrids, a hybrid microgrid structure is proposed. In this configuration, AC and DC sources are connected to their respective microgrids—AC sources to the AC network and DC sources to the DC network. An interlinking converter facilitates power exchange between the two networks, maintaining system balance by transferring energy based on load conditions. Finally, the paper also discusses various control strategies for these interlinking converters.