Abstract
In this paper an effective current based inverter efficiency computation method for a hybrid microgrid system consisting of renewable energy sources and energy storage systems is proposed. Using the proposed inverter efficiency computation method, the efficiency curve of a single inverter is obtained. Then, particle swarm optimization is used to solve the loss minimization function of a parallel inverter setup. In this work, instantaneous symmetrical component theory and power management algorithm (PMA) are used for generating reference quantities for various power electronic converters. Once, the reference quantity for the parallel inverter setup is obtained, the reference quantity sharing among parallel inverters is determined by particle swarm optimization to achieve optimal conversion efficiency. Apart from energy savings analysis, power quality aspects such as harmonic mitigation, reactive power support and unity power factor are achieved. The proposed control strategy is simulated using a MATLAB based simulink environment only during excess mode of microgrid by taking PV variations into account.
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