Intelligent control scheme for output efficiency improvement of parallel inverters

Parallel inverters are often used for the interconnection of Renewable Energy Generation Systems (REGSs); however, the output efficiency using the conventional current-sharing control scheme is low at light loads. Therefore, an intelligent control scheme for output efficiency enhancement of parallel inverters is proposed in this paper. The proposed control scheme is based on the output efficiency curve of a single inverter and then an artificial-intelligence-based algorithm is used to find the optimal output efficiency of parallel inverters. The integration of the proposed control scheme into a Photovoltaic Generation System (PVGS) with a rated output power of 20kW interconnected by 10 inverters with rated output power of 2kW is simulated in this paper. Simulation results demonstrate the performance of the proposed intelligent control scheme in output efficiency improvement of parallel inverters at light loads.