光储联合发电系统低电压穿越控制策略研究

Study on Low-voltage Ride through Control Strategy of Photovoltaic/Storage System

针对光伏系统在电网低电压穿越时会出现过压、过流的问题,提出了一种基于光储协调控制的策略。在低电压时间内,光伏系统采用最大功率跟踪控制,利用储能系统吸收多余的有功来解决装置过压的问题;对输出电流采取协调分配控制,不仅解决了过流问题,而且还可向系统提供一定的无功功率以便于系统电压恢复。

According to the problem of the over current or over voltage appeared on the PV system during Low Voltage Ride-Through,we propose a strategy based on Photovoltaic-Energy storage Hybrid System. During the Low Voltage RideThrough time,the PV system works on the maximum power point of PV panels and the Energy storage system absorbs the excessive active power to solve the problem of over voltage. A current limit control strategy with the function of reactive compensation is proposed,it can not only solve the problem of over current,but also help system voltage recovery.