大容量电池储能参与电网一次调频的优化控制策略研究

Research on the Optimal Control Strategy of Large Capacity Battery Energy Storage for Primary Frequency Modulation

大容量电池储能可有效缓解由于高渗透率新能源接入带来的电网一次调频性能弱化的问题,提出了一种融合虚拟惯性和可变下垂控制的大容量电池储能一次频率控制策略,引入虚拟惯性响应环节可有效降低频率波动初期的频率变化速率,在经典下垂控制的基础上基于SOC对下垂系数进行修正,在保证储能调频效果同时避免了储能过充过放,基于MATLAB平台进行了仿真验证,结果表明提出的综合调频策略可以有效降低频率波动幅度,减少频率稳定时间,同时保证储能SOC运行在合理区间,实现了储能安全运行和支撑电网频率的双重目标。

The weakening problem of power system primary frequency regulation ability due to high penetration of new energy integration can be effectively alleviated by large capacity battery energy storage. In this paper, a fusion primary frequency modulation strategy involving virtual inertia and variable droop control is proposed for large capacity battery energy storage. The virtual inertia control can reduce the initial frequency change rate of frequency fluctuation. Based on classical droop control, the droop coefficient is modified according to SOC （State of Charge） , so as to avoid over- charging and over-discharging and to ensure energy storage frequency modulation effect at the same time. The strategy is simulation realized in MATLAB/SIMULIN. The results show that the proposed frequency modulation strategy can effectively reduce the frequency fluctuation and the frequency stabilization time. The results also show that the SOC of energy storage can be controlled in a reasonable range. It achieves dual control objective of safety operation and sup- porting system frequency.