A wireless load sharing controller to improve the performance of parallel-connected inverters

In this paper, we present a wireless load sharing controller to improve the performance of parallel-connected inverters. It also explores the control of active and reactive circulating current through the analysis of the proposed parallel system model taking the over ratio of the line impedance into account. And the control strategy proposed can avoid the large drop of the output voltage amplitude and frequency caused by load variation through the adaptive droop coefficient. It also uses adaptive integral loop gain to enhance dynamic performance of parallel systems. Simulation and experimental results are all reported, confirming the validity of the proposed control technique.