摘要
受风速变化、风机投切和电力电子器件特性等因素影响,永磁风机经柔直系统接入电网会产生振荡问题,本文从阻抗的角度对永磁风机的振荡问题进行研究。首先,根据物理特性将外送电网分为永磁风机、变压器、电力电子变换器和同步发电机等部分,并构建阻抗模型。然后,对各部分阻抗模型采用频率扫描的方法,提出RLC电路阻抗稳定性判据,并分析各部分的阻抗变化范围,研究各环节的稳定性。最后,分析小信号阻抗模型的局部与全局稳定性,验证了阻抗模型稳定性判据的有效性。
Due to the influence of variation of wind speed,switching of wind turbine and characteristics of power electronic device,permanent magnet wind turbine connected to power grid through flexible DC system will produce oscillation problem.In this paper,the oscillation problem of permanent magnet fan is studied from the perspective of impedance.Firstly,according to the physical characteristics,the external power grid is divided into such parts as permanent magnet fan,transformer,power electronic converter and synchronous generator and the impedance model is constructed.Then,the impedance stability criterion of RLC circuit is proposed by frequency scanning method for each part of impedance model,and the impedance variation range of each part is analyzed so to study the stability of each link.Finally,the local and global system stability of the small signal impedance model is analyzed and the validity of the stability criterion is verified.
作者
董增波
张为庆
刘红涛
李江
孙乾
DONG Zengbo;ZHANG Weiqing;LIU Hongtao;LI Jiang;SUN Qian(State Grid Hebei Electric Power Co Ltd,Shijiazhuang 050000,China;School of Electrical Engineering,Northeast Electric Power University,Jilin Jilin 132012,China)
出处
《电力电容器与无功补偿》
2022年第3期135-142,共8页
Power Capacitor & Reactive Power Compensation
关键词
柔性直流输电
振荡
阻抗特性
特征根分析
flexible HVDC transmission
oscillation
impedance characteristics
eigenvalue analysis
