双馈风机改善电力系统阻尼特性的研究

Research on Increasing Power System Damping with Wind Turbine-driven Doubly-fed Induction Generator

风电装机容量的快速增长使其对电力系统的影响更加显著,因此,研究风电对电力系统阻尼特性的影响具有重要意义。文中建立了含双馈风机的多机系统小干扰稳定分析模型,提出了在双馈风机转子侧控制器中引入附加阻尼控制环节用以改善电力系统阻尼。最后以WSCC 3机9节点系统为算例,采用特征值分析法对附加阻尼控制环节引入前后系统的阻尼特性进行了分析,并给出了时域仿真验证。研究结果表明附加阻尼控制环节对系统阻尼特性具有良好地改善作用。

The wind power has more significant influence on the power grid because of its growing installed capacity. So it is of importance to study the influence of wind power on the power system damping. A multi-machine system model with wind turbine-driven doubly-fed induction generator （DFIG） was built for the small signal stability analysis. To increase the power system damping, an additional damping control was applied into the controller in the rotor side of the DFIG. The change of system damping after the additional damping control was added was got by eigenvalue analysis and proved by time domain simulations in the WSCC 3-generator-9-bus system. The results showed that the additional damping control has good effect on the system damping.