储能型风电场系统的钒电池并联运行控制方法

Control method of parallel vanadium batteries operating in energy stored wind farm system

钒电池直接并联时存在电流分配不合理和环流现象。针对这个问题,提出一种基于SOC状态的钒电池并联运行分流控制策略,得出电流控制参数的公式,通过DC/DC变换器实现多个钒电池并联运行的分流控制,并有效地调节风电场出口处的并网功率。在Matlab/Simulink环境下,基于本文所提出的钒电池储能系统,建立了储能型风电场模型。仿真结果表明,该系统实现了对风电场出口处并网功率的调节,并且成功实现了钒电池按照SOC状态充放电,防止系统中钒电池的过冲或者过放,避免了环流,验证了所提出方法的有效性。

Wind farms with vanadium battery energy storage system are approved and welcomed. Against the phe-nomenon of unreasonable current distribution when vanadium batteries are directly paralleled, a control strategy of parallel vanadium battery based on the state of charge （SOC） is proposed. The current control formula is given in this paper. Vanadium batteries are paralleled to adjust the power grid at the exit of wind farms by bidirectional DC/ DC converter. A wind farm model with vanadium battery energy storage system is simulated on MATLAB/Simulink. The simulation results show that this system can adjust the power grid of wind farms, and achieve the goal that the charging and discharging of vanadium batteries are completed according to their SOC, so as to avoid the overcharge or over-discharge successfully. Due to the control of current of vanadium battery, vanadium batteries＇working con-dition has been improved. The effectiveness of the proposed method can be verified well.