Multi-inverters control technique with current sharing control for back-up power system applications

The purpose of this paper is to present a multi-inverter control technique to achieve fast dynamics and current sharing. The system is designed for back-up power system applications, especially for base station, etc. The multi-inverter system consists of one master module and several slave modules. The master module is with voltage and current control. The voltage controller is with proportional and resonant controller and the current controller is with resonant control. Both don´t invoke any lag compensator at line frequency and thereby providing fast dynamics. Current sharing among modules achieved by a duty compensator is proposed in this paper. Experimental results derived from a digital-controlled 7.5 kW experimental system are presented for confirmation. The results show that both fast dynamics and current sharing can be achieved and thereby confirming the claims of this paper.