【摘要】 串联补偿技术在风电外送系统中应用广泛，可有效提升线路的输送能力。然而，当双馈风电机组接入含串补的电网时，由于阻抗特性不匹配，可能引发次同步振荡，从而影响系统稳定运行。为此，文章基于双馈风电机组与串补电网的阻抗模型，开展系统稳定性分析，并提出一种基于二阶巴特沃斯滤波器和移相器的选频移相控制策略，以重塑双馈风电机组在次同步频段的阻抗相频特性，从而提升系统的相位裕度。同时，建立了选频移相环节的频率响应数学模型，量化分析了该控制策略对双馈风电机组宽频阻抗特性的影响。最后，基于RTLAB搭建了半物理试验平台，对频率响应数学模型及次同步频段阻抗相频特性重塑策略进行了仿真验证。更多还原

【Abstract】 Series compensation is widely used in wind power transmission systems to enhance the transmission capacity of power lines. However, when wind turbines, represented by the DFIG, are connected to a series-compensated grid, the mismatch in impedance characteristics can lead to the risk of subsynchronous oscillations, deteriorating the system’s operational performance. This paper conducts a stability analysis of the system based on the impedance models of the DFIG and the series-compensated grid. A frequency-selective phase-shifting control strategy, utilizing second-order Butterworth filter and phase shifter, is proposed to reshape the impedance phasefrequency characteristics of the DFIG in the subsynchronous frequency band, thereby improving the phase margin of the system. Furthermore, a frequency response model of the frequencyselective phase shifter module is established to quantitatively analyze the impact of the proposed control strategy on the wideband impedance characteristics of the DFIG. Finally, a hardware in loop platform for the DFIG is built based on RT-LAB, and the mathematical model of frequency response and the reshaping of phase frequency characteristics in the subsynchronous frequency band are verified by simulation.更多还原