Load Sharing in Parallel Microgrid Inverters Using One-Cycle Control

This paper investigate the properties of the circulating current and load sharing in parallel microgrid inverters. The existing methods cannot minimize efficient circulating current for the case of nonlinear load. The one-cycle control (OCC) technique and virtual complex impedance loop are included in the proposed controller in order to proper load sharing and reduce the circulating current due to impedance mismatch. Simulation results are presented to prove the improvement achieved by the new controller. Compared to the pulse width modulation (PWM)، the proposed method، under different system impedances، reduces more effectively the voltage total harmonic distortion (THD) and offers advantages such as: constant switching frequency، simple circuitry، improved dynamic behavior of the control system during load change and start up.