考虑系统频率安全稳定约束的风储联合频率响应控制策略

为提升风-储联合运行系统的动态频率稳定性能，针对目前调频控制策略未充分发挥风电机组频率调节能力、无法适应负荷扰动过大情况以及转子转速恢复阶段存在频率二次跌落的问题，提出一种考虑系统频率安全稳定约束的风储联合频率响应控制策略。在惯量响应阶段结合转速约束和频率指标自适应调整虚拟惯量和下垂控制系数，在转子转速恢复阶段利用负指数函数动态调整转速恢复过程中功率参考值，避免频率的二次跌落。将风电机组与储能电池结合，引入频率稳定域概念，利用储能电池扩展频率稳定域边界，进一步提升风储联合系统的抗负荷扰动能力和频率稳定性。最后对风储联合调频策略进行仿真，结果表明在不同风速和不同负荷扰动下，所提控制策略能充分发挥风电机组频率响应控制能力的同时，避免了频率二次跌落，提升了电网频率安全稳定性。

Coordinated control strategy for wind turbine and energy storage equipment considering system frequency safety and stability constraints

For a wind storage joint operational system, the current frequency modulation control strategy does not give full play to the frequency regulation ability of the wind turbine, cannot adapt to excessive load disturbance, and there is also a problem of secondary frequency drop in the rotor speed recovery phase. To improve the dynamic frequency stability performance, this paper proposes a wind storage joint frequency response control strategy considering system frequency safety and stability constraints. At the inertia response phase, the virtual inertia and droop control coefficient are adaptively adjusted in combination with the constraint of speed and frequency indicators. In the rotor speed recovery phase, the negative exponential function is used to dynamically adjust the power reference value in the speed recovery process to avoid a secondary drop of frequency. At the same time, combining wind turbines with energy storage battery devices, the concept of frequency stability domain is introduced, and energy storage batteries are used to expand the boundary of the frequency stability domain, further improving the ability of wind storage joint systems to accept load disturbances and frequency stability. Finally, simulation verification is conducted on the strategy, and the results show that the proposed control strategy takes into account the wind turbine frequency response ability at different wind speeds and disturbances, while avoiding secondary frequency drops and improving the frequency safety and stability of the power grid.