变速风力发电机高效利用风能所需的风能最大功率点追踪(MPPT)算法的关键在于能否根据风速变化快速调节风轮转速,使其迅速达到相应的最佳转速。采用直接转矩控制思想以达到此目标,首先介绍了风力发电机空气动力学特性及永磁同步电机直接转矩控制原理,然后通过空间矢量脉冲宽度调制(SVPWM)直接电流控制的整流器实时控制其输出电流跟踪指令电流的方法实现变速风力发电机中的MPPT控制。仿真研究证明该方法具有控制简单、跟踪响应快的特点,能够达到风能的MPPT算法要求。

模糊逻辑控制策略可能在系统包含强非线性（如风湍流强）或控制目标包括疲劳载荷时具有潜力。

行业制造-电动装置-一种兆瓦级双馈异步变速风力发电机主轴系结构.zip

Abstract —— Grid connected wind turbines may produce flicker during continuous operation. This paper presents a simulation model of a MW-level variable speed wind turbine with a doubly fed induction generator developed in the simulation tool of PSCAD/EMTDC. Flicker emission of variable speed wind turbines with doubly fed induction generators is investigated during continuous operation, and the dependence of flicker emission on mean wind speed, wind turbulence intensity, short circuit capacity of grid and grid impedance angle are analyzed. A comparison is done with the fixed speed wind turbine, which leads to a conclusion that the factors mentioned above have different influences on flicker emission compared with that in the case of the fixed speed wind turbine. Flicker mitigation is realized by output reactive power control of the variable speed wind turbine with doubly fed induction generator. Simulation results show the wind turbine output reactive power control provides an effective means for flicker mitigation regardless of mean wind speed, turbulence intensity and short circuit capacity ratio.