Abstract:  In order to solve the problem that the intermittent photovoltaic power generation and the diversity of electricity load cause frequent fluctuations of bus voltage of the household photovoltaic power station， a kind of photovoltaic power station structure containing hybrid battery energy storage is designed. For PV bus voltage stability， this paper proposes a power management strategy for the hybrid energy storage system by combining a low pass filter with fuzzy control. First of all， the fluctuations in DC bus voltage are divided into high frequency and low frequency components. Then the low frequency component is processed by energy type battery， while high frequency component is processed by power battery， to realize the stability of bus voltage in power station. At last， on the basis of bus voltage stability， two components of battery energy are redistributed to effectively prolong the service life of the energy type battery. In order to verify the rationality of the strategy， a simulation model is established. The simulation results show that the strategy designed in this paper may suppress the voltage fluctuation of the photovoltaic DC bus， and the voltage fluctuation of the bus is controlled within 1.25%.

Key words: photovoltaic energy storage power station, hybrid energy storage system, charging and discharging control, strategy research