Battery Energy Storage System Control for Voltage Regulation in Microgrid with High Penetration of PV Generation

This paper presents an adaptive droop based control of battery energy storage system (BESS) for voltage regulation in low voltage (LV) microgrid with high penetration of photovoltaic (PV) generation. The proposed control strategy aims to eliminate voltage rise problem to prevent over-voltage violations caused by peak PV generation or low power consumption. Furthermore, voltage drop problem is mitigated to circumvent under-voltage violations during the intermittency of solar energy generation or high loading conditions. The BESS will be charged and discharged corresponding to droop characteristic during voltage rise and drop, respectively. Fuzzy logic is applied to enhance performance of the proposed strategy by considering allowable voltage deviation limits and state of charge (SoC) of the BESS to avoid an undesired saturation of batteries. The proposed control strategy is simulated using a LV microgrid to analyze and investigate the voltage regulation capability in comparative study. The simulation results demonstrate that the proposed control strategy offers an effectiveness and potential performance of voltage regulation in LV microgrid with high penetration of PV generations.