双馈发电机简化动态模型及在风电系统中应用

从电机基本原理出发，在定子旋转磁场坐标下，建立了由转子励磁电压双轴分量及发电机输入的机械转矩为控制变量的双馈发电机简化3阶动态模型。该模型简洁、明确、能较准确地描述发电机动态特性．易于数字仿真的实现。同时，根据所建模型及Matlab软件，详细比较了双馈发电机精确模型和简化模型在发电机运行状态发生改变后的各个物理量的响应特性。比较结果充分说明了该简化模型有良好的精确度，能很好的代替精确模型应用在转速变化范围较大，发电机功率因数较高的双馈发电机的建模和相关研究中，例如风力发电中变速恒频风电机组建模及并网运行的研究。

Simplified dynamic model of doubly-fed induction generator and its application in wind power

Based on the theory of induction machine,a simplified three-order dynamic model for doubly-fed generator is presented,which adopts the reference frame of stator's circumrotatory magnetic field with the rotor voltage and mechanical torque as control variables. The simplified model describes dynamic characteristics correctly and is easily implemented by computer. Based on Matlab software,response characteristics of electrical variables when changes have been taken place on generator's running state are simulated and compared between simplified model and exact model. Results show that the simplified model has better definintion and can substitute for the exact model in research of doubly-fed generator with high power factor and large range in rotor speed,such as modeling of variable-speed wind turbines and research of operating characteristics in network. This project is supported by the National High Technology Research and Development of China(863 Program)(2001AA512021-5).