摘要
分别针对风电场的定桨失速型、直驱式永磁型和双馈异步型风力发电机组3种主流机型的机网扭振机理进行了分析。建立了风力发电机组机网扭振研究的小信号分析模型,包括风力机的机械旋转系统模型、发电机模型、控制模型及电网模型。其中机械旋转系统包括风力机的桨叶、高速轴、齿轮箱、低速轴和发电机转子,等效为3个集中质量块-弹簧模型;发电机、电网及控制模型均在dq坐标系下建立。建立了整个模型的状态方程。通过仿真研究了上述3种机型风电机组机网扭振的单机对无穷大仿真模型,利用输电线路首端三相短路故障激发风电场和电网间的机网扭振现象,得到了转速和转矩的扭振曲线,扭振频率与计算得出的风力发电机组机械旋转系统固有频率吻合,验证了模型的准确性。
Principles of torsional vibrations were analyzed and small-signal models were established for three main type of wind turbines including fixed pitch stalled wind turbines with an induction generator （ IG）, variable pitch variable speed wind turbines with a doubly-fed induction generator（DFIG） and variable pitch variable speed wind turbines with a permanent magnet synchronous generator（PMSG）. The small-signal models include the rotating sys- tem model, stator model, controller model and the grid model; a three-mass model is used to model the ratating system which contains blades, high-speed shaft, gear box, low-speed shaft and the rotor of the generator. The sta- tor and the grid model are established in the dq coordinate system. The equations of state of the whole model are derived. The simulation software EMTP is applied to establish the stand-alone to infinity system for the study of wind turbine torsional vibration. In the simulation, three-phase ground fault is applied to excite the torsional vibra- tion. The simulation results show that the torsional interaction occurred and the torsional vibration frequency agrees with the natural frequency of the rotating shaft system, and therefore verify the accuracy of the models.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2011年第9期1281-1287,共7页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50807036)
关键词
风力发电
定桨失速型异步感应式风力发电机
双馈异步风力发电机
直驱式永磁同步风力发电机
机网扭振
wind power
fixed pitch stalled wind turbines with an induction generator（IG）
variable pitch variablespeed wind turbines with a doubly-fed induction generator（DFIG）
variable pitch variable speed windturbines with a permanent magnet synchronous generator（PMSG）
torsional interaction
作者简介
解大（1969-），男，博士、副教授，主要从事电力系统FACTS和电力系统仿真方面的研究。Xieda@sjtu．edu.cn
