Abstract

With the increase of photovoltaic (PV) generation in microgrid, the frequency response capability of system decrease continuously, it is urgent to participate in frequency regulation of PV generation system and energy storage system. Therefore, a fuzzy adaptive sliding mode control strategy for PV system and a droop control strategy for the energy storage system is proposed for making the PV system and the energy storage system cooperatively participate in frequency regulation of the microgrid. For the PV fuzzy adaptive sliding mode control of the PV system, the sliding mode surface function is firstly designed according to the PV power-voltage characteristic curve, and then the adaptive sliding mode surface compensation is designed to provide adaptive power reserve for regulating frequency of microgrid in both the up and down directions. For the droop control strategy of the energy storage system, the current control loop and power control loop are designed, and the adaptive charging and discharging power control strategy is designed to collaboratively participate in the frequency regulation of the microgrid by frequency deviation. The control strategy is designed that has some advantages. It doesn’t need maximum power estimators, irradiance sensors, communication devices, and detailed PV models. Simulation results demonstrate that the proposed control strategy can effectively suppress the bidirectional frequency fluctuation of the microgrid.

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