光/储混合系统中的储能控制技术研究

Study on Control Technology of Energy Storage Station in Photovoltaic/Storage System

在含有高渗透率光伏发电的配电网中,安装储能系统可以减小光伏功率波动对电网的冲击。为了实现储能对光伏发电功率的平滑作用,提出一种基于低通滤波与短时功率预测技术的储能控制方法,大幅度消除了传统低通滤波方法造成的延时,同时可降低光伏功率预测误差对控制效果的影响,提高了平滑效果,节省了储能安装容量。仿真结果显示该策略能有效降低光伏发电功率的波动性,降低电池过充或过放现象的发生概率。

When the penetration of photovoltaic system is high in a distribution network,energy storage system is available to reduce the impact on grid caused by PV power fluctuation. In order to smooth PV power,this paper proposes a control method of energy storage system based on the short-time photovoltaic power prediction technology and low-pass filtering principle. By using this method,the delay caused by traditional low pass filter method is eliminated and the influence of photovoltaic power prediction error on control effect is also reduced. As a result, the control effect is improved and the capacity of energy storage system is limited. The simulation results show that the strategy can effectively reduce the fluctuations of PV power,and prevent storage system to be over-charged or over-discharged.