Efficiency Optimization Method for Parallel Converters in Fault-tolerant Microgrids

Abstract

This paper proposes a model-based method that maximizes the efficiency of parallel converters in microgrids. Parallel converters are operated from independent sources in a healthy state but share sources when a failed converter is eliminated, to minimize curtailed power from the lost branch in a microgrid. The proposed method develops a curve-fit efficiency function based on an efficiency model of a solar panel converter. Experimental test data is used to verify the proposed rational efficiency function with the MATLAB curve fitting toolbox. The optimization method is verified in Simulink with the analytical commuting of parallel converters. System efficiency comparison verifies that the proposed method can improve aggregated converter efficiency.