In view of the situation that the sustaining and stable operation of the micro grid only by batteries for energy leveling and adjustment can not be met due to the intermittency and instability of PV output

the optimization method of energy storage capacity allocation in photovoltaic DC micro grid considering Hydrogen energy application is proposed. Considering the application of Hydrogen energy in photovoltaic DC micro grid

the photovoltaic cell

battery

electrolyzer - Hydrogen storage tank - fuel cell are modeled and analyzed. The power leveling control strategy and hybrid energy storage charge and discharge management strategy are designed in accordance with the the modeling analysis results. The maximizing annual net profit and PV self-absorption rate are taken as the optimization objectives

an optimization model of energy storage capacity configuration is set up to obtain the optimal configuration result of energy storage capacity. The experimental results show that with application of the proposed method

the power deviation rate of photovoltaic DC micro grid is significantly reduced

the peak load balancing capacity is effectively optimized

and the self-balance rate of the micro grid is greatly improved

indicating that the method has a good capacity allocation effect.