中文摘要：

风电功率的随机波动会对电网的正常运行产生很大的负面影响,储能系统的接入可以有效地抑制风电功率波动。针对上述情况,提出一种应用实时小波变换进行频率分配并用双层模糊控制理论进行储能功率修正的多类型储能系统平滑控制策略。该策略创新运用一种基于小波变换理论的新型分频方法,根据风电功率波动部分频率的高低合理分配多类型储能系统功率,即用超级电容器平抑短期功率波动,用蓄电池减弱长期功率波动;同时应用双层模糊控制方法,进行储能系统功率的修正,自动调整储能设备的荷电状态,削弱单层模糊控制方法对平滑输出的影响,改善平滑效果。算例结果表明,所提出的控制策略能合理分配功率并可有效地平滑风电出力波动,同时保证多种储能设备的荷电状态维持在合理范围内;双层模糊控制方法较单层控制方法具有更好的平滑效果。

英文摘要：

Random fluctuations of wind power will cause a great negative impact on the normal operation of the power grid, which can be effectively suppressed by an energy storing system. Such being the case, a smoothing control strategy for hybrid energy storage system （HESS） using real-time wavelet transform to allot frequency and two-level fuzzy control theory to adjustthe power values of the energy storage system is proposed. The strategy applies a new frequency allocating method creatively using the wavelet transform theory to make rational distribution of hybrid energy storage system＇ s power based on the value of wind power fluctuations＇ frequency, the super capacitor is used to smooth short-term power fluctuations and the battery is used to slow down long-time fluctuations. A two-level fuzzy control method is proposed and applied simultaneously to modify thepower of HESS, which can adjust the charged state of energy storage devices, weaken the influence of the single fuzzy control method for smoothing the output and improve the smoothing effect. Finally, the example results show that the control strategy proposed can rationally distribute the energy storage devices＇ power and effectively smooth wind power fluctuations whileensuring the state of charge （SOC） of energy storage devices will be maintained within a rational range. It also has a better smoothing effect than the single-level fuzzy control method.