Cooperative Optimization Control Method for Photovoltaic and Energy Storage in Photovoltaic Zone to Participate in Multiple Application Scenarios

Equipping energy storage in photovoltaic (abbr. PV) zone can mitigate the fluctuation of PV output and improve PV accommodation rate, besides, at the same time the overmeasure of energy storage can also participate in other application scenarios to improve the operating economy of PV and energy storage system. For this reason, a cooperative optimization control strategy for energy storage simultaneously participating in three application scenarios, i.e., smoothing fluctuation, energy time-shifting and frequency regulation market, in which the maximized earning of PV and energy storage operator was taken as the objective and the PV and energy storage power and the load-side power were taken as constraint conditions, was proposed. The impacting extent of market price factor on earning, expenditure and PV curtailment rate as well as the impact on strategy inclination extent were researched. Results of computing example show that utilizing the proposed cooperative optimization strategy and on the premise of increasing the earning of PV storage operator the expenditure of the users inside the zone can be decreased and the PV accommodation rate can be improved, thus, it provides theoretical basis for operators carrying out the market fluctuation-oriented decision process, and then promotes the development of construction of optical storage zone.