Coordinated Frequency Regulation Strategy of Photovoltaic and Energy Storage System Based on Adaptive Power Tracking Control

Large-scale photovoltaic (PV) units connected to the grid will cause power system inertia decline and insufficient frequency regulation ability. The current frequency regulation method of active power reserve of PV system will generate a large amount of abandoned solar energy and affect generation benefit. Furthermore, the frequency regulation strategy of only replying on the energy storage system will increase the cost of investment. Thus, to improve the frequency stability of power system and reduce the investment cost, this paper proposes a novel coordinated frequency regulation strategy based on adaptive power tracking (APT) control to achieve the PV and energy storage system cooperatively provide frequency regulation. In this strategy, the PV system adopts sliding mode control (SMC)-based APT and the energy storage system adopts fuzzy virtual synchronous generator (VSG)-based APT, which not require the power estimator, and detailed PV and energy storage models. The proposed strategy has better performance compared the traditional method through the simulation.