A New Adaptive Inertia-Based Virtual Synchronous Generator with Even Inverter Output Power Sharing in Islanded Microgrid
G. W. Chang, Kha T. Nguyen
Abstract
When the inverter-based microgrid (MG) operates in islanded mode, effective frequency regulation and equitable sharing of inverter power output among distributed generators (DGs) require the adoption of suitable control strategies. To simultaneously achieve these objectives in inverter control, this article proposes two methods: a novel adaptive inertia-based virtual synchronous generator (VSG) for frequency regulation, and an accurate power sharing mechanism based on a new feedforward line impedance approach for multiple parallel inverter-based DGs acting as voltage sources with stability analysis. By implementing the proposed methods, the VSG-based DG inverters can be appropriately controlled to support MG frequency and ensure even power sharing among inverters. Simulations using PSIM and hardware tests conducted with TMSF28335 DSP for a three-inverter MG are performed to demonstrate the efficacy of the proposed methods.