Photovoltaic-storage coordinated support control technology based on primary frequency regulation requirements

Under the constraints of the frequency security index, effectively utilizing the energy reserves of the photovoltaic-storage system to meet system frequency regulation demands is crucial for ensuring the safe operation of power grids in high-penetration renewable energy regions. This paper first analyzes the frequency response characteristics of the photovoltaic-storage power generation system. Second, a frequency dynamic response model of the photovoltaic-storage system is established to calculate the extreme value time of system frequency changes and analyze its influencing factors. Based on this analysis, the paper evaluates the system's inertia and primary frequency regulation requirements to meet system frequency security constraints and proposes a cooperative control strategy for photovoltaic-storage. Finally, a photovoltaic-storage grid-connected simulation system is constructed to verify that the proposed control strategy satisfies the security requirements of system frequency by coordinating the allocation of photovoltaic and storage power.