面向光伏电站的储能电池设计与系统电压控制研究OA

To address the issues of energy waste and grid voltage fluctuations caused by the intermittency and uncertainty in photovoltaic(PV)power generation,this study proposed an integrated solution combining optimized energy storage battery design and coordinated system voltage control.A hybrid AC/DC energy storage architecture was established,in which the DC-side storage was dedicated to smoothing power fluctuations,while the AC-side storage was responsible for grid frequency regulation.A quantitative model was developed to determine the power and capacity configuration of the energy storage systems.On the control level,a global voltage control model based on PV-storage collaboration was constructed:an improved extremum seeking method was adopted on the PV side to achieve rapid,accurate maximum power point tracking under dynamic conditions,while a nonlinear voltage-current dual-loop controller based on differential flatness theory was designed on the storage side to achieve precise regulation of DC bus energy.Experimental results demonstrate that the proposed strategy reduces the system frequency regulation actions to nearly zero,decreases the voltage fluctuation range to within±2％,shortens the recovery time to 0.5 s,and improves the overall system energy efficiency to 93.8％.The solution effectively enhances operational stability,energy utilization efficiency,and grid ancillary service capability.