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中文摘要：
结合风力机运行特性，探讨水磁直驱变速风电系统成为强迫振荡源的原因。首先理论分析由风剪切和塔影效应引起的风力机机械转矩波动特性，推导出风电系统电磁转矩波动与机械转矩波动的关系表达式，采用频域法分析风电机组的输出功率特性，并通过时域仿真进行验证。研究结果表明，永磁直驱风电系统可能成为共振型低频振荡的扰动源，其功率波动频率与风力机转速相关，幅值与风力机运行点、风电系统参数和系统阻尼相关。引起共振的主要因素是塔影效应，而风剪切分量很难引发共振。
英文摘要：
The reason why a permanent magnet synchronous generator （PMSG） based variable speed wind turbine system forming a low frequency disturbance source was discussed with considering the wind turbines＇ operation characteristic. Firstly, the characteristic of mechanical torque fluctuation induced by wind shear and tower shadow was analyzed theoretically. The relationship was derived between the electrical torque fluctuation and mechanical torque fluctuation. And further, the process was studied of fluctuating power transfer through permanent magnet generator wind turbine and the output power characteristic of the wind turbine system was represented. Simulation was done to validate the results. It is shown that a PMSG can be a forced low frequency disturbance source. The frequency of fluctuation is related to rotor speed and the magnitude is related tO operation points, parameters of the wind turbine system and the system damping. The main contributor of the fluctuations is wind shadow and the wind shear is not likely to induce forced oscillations.
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