基于全钒液流电池光储一体化波动抑制策略

The Fluctuation Suppression Strategy of Photovoltaic and Energy Storage Integration Based on Vanadium Redox Flow Battery

弃风弃光是可再生能源发展的核心问题,以光储联合发电系统来抑制波动是研究热点.以光储联合发电系统为研究对象,研究光伏出力与储能的相互配合.采用全钒液流电池平抑光伏波动,在一阶低通滤波和滑动平均原理的基础上,使联合系统输出功率保持平滑.建立全钒液流电池的数学模型,验证钒电池能够平抑不同时间尺度下的波动.在Matlab/Simulink上对5 kW/6 h全钒液流电池进行仿真,仿真结果表明,在不同的滤波时间常数下光储系统功率输出平滑且最大功率输出降低,并计算最大功率和最大能量需求,为配置光储联合发电系统各组件容量提供依据;在电池特性上,全钒液流电池能满足深度充放电次数的要求.

The abandonment of wind and light is the core issue of renewable energy development, and suppressing fluctuation with the combined power generation system of photovolatic and energy storage is a research hotspot. The combined power generation system of photovolatic and energy storage is the research object of this paper, which is used to study the interaction between PV output and energy storage. Stabilizing the photovoltaic fluctuation with vanadium redox flow battery can make the output power of the combined system smooth, which is based on the first-order low-pass filter and the moving average principle. The mathematical model of vanadium redox flow battery is established to verify that vanadium battery can stabilize fluctuations in different time scales. We did a simulation of 5kW/6h vanadium redox flow battery on Matlab/Simulink, and the simulation results show that the power output of the system of photovolatic and energy storage is smooth and the maximum power output is reduced under different filter time constants. This paper calculates the maximum power and the maximum energy requirement, which can provide the basis for the capacity configuration of each component of the combined power generation system of photovolatic and energy storage;And considering the battery characteristics, vanadium redox flow battery can also meet the requirements of the depth charge and discharge times.