An Enhanced Universal Droop Control for Load Sharing in AC Microgrid for Different Load Condition

Abstract

The compatibility of integrating solar PV, fuel cells, batteries, ultra-capacitors, wind, and EV loads with the utility grid or standalone AC microgrid has improved with the evolution of power electronic topologies. This paper proposes a hybrid control scheme for precise load sharing of several voltage source inverters (VSIs) operated in parallel and improved AC microgrid voltage and frequency stabilization under the different load conditions. This paper presents the control of an AC microgrid using an enhanced universal droop control scheme for master VSI operated in a standalone. Further, the current reference for slave VSI is set independently to account for local load variations. Hence, local load variations do not impact AC microgrid voltage or frequency. Simulation results are presented for the proposed work.