在复合储能系统中，通过协调不同类型储能之间的运行是提高储能调频性能的重要手段。为充分挖掘储能调频潜力，本文提出了一种电池储能联合抽水蓄能的复合储能二次调频策略。针对传统一阶低通滤波器截止频率固定的缺点，提出了滤波时间常数根据电网频率变化进行动态调整方法，实现了对复合储能内部调频指令分配。在调频阶段，考虑电池储能荷电状态（State of charge，SOC）约束，设计了电池储能-抽水蓄能协调控制的双模糊控制策略。在非调频阶段，根据Logistic函数构建电池储能SOC自恢复曲线，利用抽水蓄能剩余容量对电池储能进行SOC自恢复。在两种典型工况下对本文策略进行仿真分析，结果表明所提策略在改善调频效果和电池储能SOC状态方面具有优势。

In the composite energy storage system, it is an important method to improve the frequency modulation performance of energy storage by coordinating the operation of different types of energy storage. In order to fully tap the potential of energy storage frequency modulation, a secondary frequency modulation strategy of composite energy storage of battery energy storage combined with pumped storage is proposed in this paper. In order to overcome the shortcoming of fixed cut-off frequency of traditional first order low-pass filter, a dynamic adjustment method of filter time constant according to the frequency change of power grid is proposed to realize the allocation of internal frequency modulation instruction of composite energy storage. In the frequency modulation stage, considering the state of charge（SOC）constraint of battery energy storage, a double fuzzy control strategy for coordinated control of battery energy storage and pumped storage was designed. In the non-frequency modulation stage, the SOC self-recovery curve of battery energy storage was constructed according to the Logistic function, and the SOC selfrecovery of battery energy storage was carried out by using the remaining capacity of pumped storage. The simulation analysis of the proposed strategy under two typical working conditions shows that the proposed strategy has advantages in improving the frequency modulation effect and the SOC state of battery energy storage.