Modeling and Analysis of Voltage Source based Battery Energy Storage System in Microgrid to Improve Power Quality

Abstract

Rising demand of renewable energy sources based distributed generation poses several challenges in utility grid operation. These shortcomings have been solved by microgrid. Power quality improvement is the main technical challenge in the applications of microgrid. Renewable energy sources can be integrated with microgrid in a better way by introducing a battery energy storage system. Power quality improvement, voltage and frequency regulation and catering the intermittency of renewable energy sources are few advantages of battery energy storage system. Integration of voltage source-based battery energy storage system in solar photovoltaic connected microgrid is presented in this paper. Voltage level between main grid and generation of solar power is maintained with the help of battery energy storage system. Power quality improvement ofintegrated microgrid system is done with control strategy of bidirectional converter used in battery energy storage system. Hysteresis band current controller is used in this paper to control the currents of battery energy storage system. It is a simple as well as robust technique for reduction of total harmonic distortion and voltage profile improvement as shown in the simulation results. Total harmonic distortion of system voltage is reduced 0.20%. This paper also presents the power flow to the loads using hysteresis band current controller and without using hysteresis band current controller. It is also shown by results that 45kVA is the most feasible rating of VS to deal with both linear and non-linear loads. MATLAB/SIMULINK environment is used to model and simulate the overall system performance.