风力发电机组轴系扭振模式稳定性分析

针对带串联补偿装置的并网双馈风力发电机组轴系扭振模式的稳定性,搭建了风力发电机轴系的三质量块等效模型,用小扰动法分析了轴系不同质块间的扭振模式。基于矩阵束算法辨识串联补偿度对风电场发电机组轴系扭转模式稳定性的影响,分析表明在故障情况机组轴系可能发生暂态扭矩放大。在PSCAD/EMTDC中搭建了某实际风电场中风力机轴系和发电机电磁暂态模型以及电网其它部分模型。仿真结果表明:电网故障会引发轴时系扭振模式不稳定现象,同时验证了串联补偿影响轴系扭振模式的稳定性。

Stability Analysis of Torsional Mode for Shafting of Wind turbine generator

Dealing with stability of torsional mode of grid - connected wind turbine generator including series compensation device, shafting torsional mode of the different mass are analyzed with the small disturbance method , which is based on establishing the three-mass equivalent model for shaft of wind turbine generator . The influence of stability of the wind generator Shafting torsional mode between different mass and series compensation degree level are based on matrix pencil method, and then analysis results show that shaft system may occur transient torque amplification in a fault condition. Wind turbine shaft system and generator electromagnetic transient model and other part of the grid model of an actual wind farm are built in the PSCAD/EMTDC. The simulation results show that transient torque amplification phenomenon occured in some grid fault, and verify the series compensation can affect the stability of torsional vibration mode.