基于惯量响应的双馈风电机组动态协调机理研究

大规模风力发电联网挤占了具有转动惯量的同步发电机组容量空间，削弱了电力系统惯量水平与调频能力，迫切需要风力发电参与系统频率调节。基于双馈风电机组频率响应模型，解析得到惯量表达式，并分析锁相环控制参数对双馈风电机组惯量特性影响，提出当系统发生不平衡功率扰动时，可通过优化锁相环控制参数实现双馈风电机组惯量响应。以2台双馈风电机组并联系统为例，分析惯量响应期间不平衡功率在各双馈风电机组间的分配规律，并拓展到多机并联系统。建立双馈风电机组、同步机组联网系统频率响应模型，分析系统发生功率扰动各阶段频率响应特性。最后，通过时域仿真验证了理论分析的有效性。

Dynamic Coordination Mechanism of DFIGs Based on Inertia Response

Large-scale wind power integration occupies the capacity space of synchronous generators with moments of inertia and weakens the inertia level and frequency regulation ability of the power system. Therefore, the participation of wind power generation in system frequency regulation is urgently needed. On the basis of the frequency response model of the doubly-fed induction generator (DFIG), an inertia expression is obtained analytically, and the influence of phase-locked loop (PLL) control parameters on the inertia characteristics of DFIG is analyzed. It is then concluded that the inertia response of DFIG can be achieved by optimizing PLL control parameters when unbalanced power disturbance occurs in the system. With a parallel system of two DFIGs as an example, the law of unbalanced power distribution between the DFIGs during inertia response is analyzed and extended to multi-machine parallel systems. A frequency response model of a system of integrated DFIGs and synchronous generators is built, and the frequency response characteristics in each stage of power disturbance are analyzed. Finally, the effectiveness of the theoretical analysis is verified by time-domain simulation.