A novel load sharing control technique for paralleled inverters

A new control technique have been developed, which allows paralleled inverters to share linear or nonlinear load in a distributed AC power supply system. All paralleled inverters have the same power reference, and are forced the output power to follow the same reference by using a PI controller in each inverter unit, so that all paralleled inverters can share the same output power. The approach has significant advantages over existing methods, including the ability to improve reliability and reduce interconnection bus. Principle and scheme of the load-sharing technique is analyzed. The experimental results of a three-unit prototype system show that the proposed scheme is correct.