考虑频率二次跌落的风电机组频率响应控制策略

Frequency Response Control Strategy of Wind Turbines Considering Frequency Secondary Drop

风电参与频率响应是保障高风电渗透率电力系统频率稳定性的重要方案,但风电机组的转速恢复过程可能会导致系统出现频率二次跌落(FSD)。在分析风电机组利用转子动能参与频率响应过程、FSD产生机理以及影响FSD大小主要因素的基础上,考虑风电渗透率,提出一种风电机组频率响应控制策略以减小FSD。该策略基于综合惯量控制,对风电机组的频率支撑过程和转子转速恢复过程的有功功率参考值进行分阶段设计,动态调整风电机组的输出功率来减小FSD。最后,仿真结果验证了所提策略可以在不同风电渗透率电力系统中大幅减小FSD,改善电力系统的频率响应特性。

Participation of wind power in the frequency response is an important scheme to ensure the frequency stability of power systems with high penetration rate of wind power.However,the rotational speed recovery process of wind turbines may lead to the frequency secondary drop(FSD)of the system.On the basis of analyzing the process of wind turbines using rotor kinetic energy to participate in frequency response,the generation mechanism of FSD and the main factors affecting FSD,a frequency response control strategy of wind turbines is proposed to reduce FSD considering the penetration rate of wind power.Based on the integrated inertia control,the active power reference values of wind turbines in the frequency support process and the rotor speed recovery process are designed in stages,and the output power of wind turbines is dynamically adjusted to reduce FSD.Finally,simulation results verify that the proposed strategy can significantly reduce FSD in power systems with different penetration rates of wind power and improve the frequency response characteristics of power systems.