平抑风电波动的混合储能容量配置及控制策略

为了平滑风电场输出功率，降低风电波动对电网造成的冲击，利用能量型储能元件电解槽与功率型储能元件超级电容相结合形成的混合储能系统对风电波动进行平抑。首先对大量时间片段内的储能出力进行概率统计分析，通过并网功率波动率在风电波动限值范围内的概率变化评估风电波动平抑效果，将给定置信水平的输出功率作为混合储能额定功率。在此基础上，通过考虑经济性的自适应滑动窗口算法将混合储能功率分解，进而确定超级电容的额定容量以及电解槽的额定功率，实现了兼顾经济性和波动平抑效果的容量配置。其次，依据超级电容的荷电状态、电解槽额定功率、储能系统总体功率指令制定混合储能系统的运行控制策略。最后结合风电场实际运行数据，仿真验证了所提方法可以实现功率分配、保证储能各元件正常运行，同时有效降低了风电输出功率的波动。

Capacity Configuration and Control Strategy of Hybrid Energy Storage to Smooth Wind Power Fluctuations

In order to smooth the output power of wind farms and reduce the influence of wind power fluctuations on power grid, a hybrid energy storage system consisting of energy-based energy storage element electrolyzer and power-based energy storage element supercapacitor is adopted to smooth wind power fluctuations. Firstly, the energy storage output in a large number of time slots is analyzed by probability statistics, and the smoothing effect of wind power fluctuation is evaluated by the probability change of the grid-connected power fluctuation within the limit of wind power fluctuation, and the power at a given confidence level is taken as the rated power of the hybrid energy storage. On this basis, the hybrid energy storage power is decomposed by the adaptive sliding window algorithm considering the economy, and the rated capacity of the supercapacitor and the rated power of the electrolyzer are determined, so as to realize the capacity allocation which takes into account the economy and fluctuation stability effect. Secondly, based on the charging state of the supercapacitor, the rated power of the electrolytic cell and the overall power command of the energy storage system, the operation control strategy of the hybrid energy storage system is formulated. Finally, the simulations results show that this method can effectively reduce the fluctuation of wind power while realizing the power distribution and ensuring the normal operation of each energy storage module.