A Novel Current Control Technique for Off-Grid Single-Phase Inverters

This paper presents a novel control scheme for the off-grid operation of single-phase inverters. The proposed method generates a sinusoidal output current reference that regulates the voltage at the point of common coupling (PCC) of the inverters. The proposed controller is robust to changes in load and output impedance, ensuring stable operation without the necessity for virtual impedance compensation. As a result, the proposed scheme can effectively regulate the output voltage within a narrow range by eliminating the voltage reference drop typically caused by impedance compensation. Unlike conventional droop laws, the design of this controller does not require adjustments based on output impedance characteristics. Experimental results demonstrate the superior dynamic performance of the proposed control technique.