In photovoltaic energy storage system

the conventional DC-DC converter adopts in-phase current sharing control strategy

which can not restrain the current ripple. In this paper

a reverse phase current sharing control strategy is proposed

and an anti disturbance observer is introduced. By building the experimental platform of two-phase parallel DC-DC converter of photovoltaic energy storage system based on anti disturbance observer

three control strategies

such as the two-phase current independent control

the two-phase current in-phase current sharing control and the two-phase current reverse phase current sharing control

are analyzed and compared.Moreover

the total charging situation of energy storage unit of the anti disturbance observer and non-anti disturbance observer are investigated. The experimental results show that

the scheme proposed in this paper can effectively reduce the ripple of the total charging current of the energy storage unit and suppress the voltage fluctuation of the DC bus of photovoltaic power generation.