【摘要】 近年来,国内外多次发生并网风电场引发电力系统次同步振荡的事件,风电并网系统次同步振荡稳定性的分析与控制方法成为亟待解决的科学与工程问题。文中介绍了目前风电并网系统次同步振荡稳定性的分析方法—阻抗分析法、模式分析法和开环模式分析法,并从对振荡机理的揭示、稳定性评估结论的准确性和工程实用性三个方面进行了对比。总结归纳了风电并网系统次同步振荡负电阻和开环模式耦合机理的研究成果。从柔性交流输电系统及其附加阻尼控制器、风电机组换流器附加控制环节两个方面总结归纳了风电并网系统次同步振荡的控制方法。对目前风电并网系统次同步振荡稳定性分析与控制方法的研究中尚存在的问题以及有待突破的研究方向进行了总结和展望。更多还原

【Abstract】 In recent years, the sub-synchronous oscillations of power system caused by grid-connected wind farms have occurred many times. The analysis and control method of sub-synchronous oscillation stability of grid-connected wind power system has become a scientific and engineering problem to be solved urgently. Firstly, this paper introduces the analysis methods of sub-synchronous oscillation caused by grid-connected wind power system-impedance analysis method, modal analysis method and open-loop modal analysis method. And three aspects including oscillation mechanism, the accuracy of the conclusion of stability evaluation and engineering practicality are compared for three methods. Secondly, from the perspective of the negative resistance mechanism and the open-loop modal coupling mechanism, the recent study achievements of the sub-synchronous oscillation caused by grid-connected wind power system are summarized. Then, two kinds of control methods of the sub-synchronous oscillation are described from the following two aspects: the flexible transmission system and its additional damping controller, and the additional control link of the control loop of the wind turbine converter. Finally, the existing problems in the study of the stability analysis and control methods of the sub-synchronous oscillation caused by grid-connected wind power system and the directions for future research are discussed.更多还原