Abstract: The traditional charge-discharge all-in-one machine for photovoltaic energy storage has problems of scattered equipments and big occupied area, so the system architecture which highly integrates photovoltaic, energy storage and V2G charge-discharge unit into an all-in-one machine is designed, and the control strategy of the charge-discharge all-in-one machine for photovoltaic energy storage based on time-of-use price is put forward. According to the remaining electricity and time-of-use price, the control strategy formulates working modes matching different periods to establish a mathematical model which achieves the goal of the minimum load fluctuation of distribution network and the minimum total charging cost. The paper, based on the control flow and the probability distribution of vehicle behavior characteristic, employs Monte Carlo method to make example simulation. The simulation results show that the strategy can play a great role in peak-cutting and valley-filling and smoothing the load curve, which effectively enhances the impact resistance ability of distribution network and accommodation capacity of new energy, and significantly reduces auto owners’ total charging cost.

    Key words: time-of-use price; load fluctuation; Monte Carlo method; control strategy