基于不同工况下双馈风机响应控制的电力系统频率控制方法

风电大规模并网虽然会降低电力系统对传统化石能源的依赖，但双馈风电机组自身的解耦控制会降低电力系统惯性和频率响应能力。针对该问题，将风电机组纳入系统频率调节体系，提出基于不同工况下双馈风机响应控制的孤岛电力系统频率控制方法。首先，研究了不同风况下双馈风电机组的有功频率控制模式及不同风况下的协调控制方案；然后，在深入分析双馈风电机组参与频率控制机理的基础上，提出风电机组频率控制启动判据以及风电卸载容量计算方法，该方法可降低风电备用储能，避免过多降低风电正常情况下的消纳水平；最后，仿真结果验证所提频率控制策略可在不同风速工况下有效参与系统频率控制，显著增强高渗透率风电接入电力系统的频率稳定水平。

Frequency Control Method for Power System Based on DFIG Response Control under Different Working Conditions

Although a large-scale wind power integration will reduce the dependance of power system on the traditional fossil energy sources, the decoupling control of a doubly-fed induction generator(DFIG) will reduce the power system''s inertia and its frequency response capability. Aimed at this problem, the DFIG is put into the frequency regulation system, and a frequency control method for island power system based on DFIG response control under different working conditions is proposed. First, the active frequency control mode of DFIG and the coordinated control scheme under different wind conditions are studied. Then, based on the in-depth analysis of the mechanism of the DFIG participating in the frequency control, the judgment for activating the DFIG frequency control and the calculation method for the reserve capacity of wind power are put forward. This method can reduce the reserve energy of wind power and avoid excessively reducing the consumption level of wind power under normal circumstances. Finally, through simulations, it is verified that the proposed frequency control strategy can effectively participate in the system frequency control under different wind conditions, thus significantly enhancing the frequency stability level of a high wind penetrated power system.