According to the pitch control principles and operation characteristics of pitch-controlled wind turbine, a pitch control system composed of speed loop and power loop is established. Then a grid-connected wind turbine simulation model is built via software PSCAD/EMTDG combined with each part of the mathematical model of the doubly-fed wind turbine. Optimal control of different operation stage are achieved in this way, through the simulation under conditions of turbulent wind with different speed segment. Moreover,dynamic operating characteristics of the wind turbine are respectively simulated under the gust disturbances and power grid failures perturbations. The results reveal that pitch control system can optimize the characteristics of power output to effectively inhibit the further deterioration of the fault transient response by rapid action of the pitch angle in favor of the grid rapid recovery when the grid fails.%依据风电机组的变桨距控制原理和风电机组的运行特性,建立了转速环和功率环控制的风电机组变桨距控制系统,结合双馈风电机组各部分数学模型,在PSCAD/EMTDC中搭建了风电机组的并网仿真模型.对不同风速段湍流风况条件下的风电机组并网运行特性进行仿真,实现了不同运行阶段下风电机组运行特性的优化控制,并在此基础上分别仿真了阵风干扰和电网故障扰动下风电机组的动态运行特性.仿真结果分析表明,双环变桨距控制系统可以较好地优化风电机组的功率输出特性,在电网发生故障时桨距角的快速动作也可以有效地抑制故障暂态响应的进一步恶化,有利于电网的迅速恢复.
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