基于Matlab的双馈感应风力发电机组暂态模型

Probe into Model of Doubly Fed Induction Wind Turbine System Based on Matlab

近年来,风电已在电力系统中占有了不可忽视的地位。详细分析了变速恒频双馈感应风力发电机(DFIG)的多变量、强耦合、非线性的时变参数系统,总结并建立了DFIG完整的暂态仿真模型,给出了基于定子电压定向的矢量控制策略的数学原理及详细控制框图,对其最大风能追踪的控制性能、电压控制模式和无功控制模式下电网电压跌落30%时动态响应对比以及电网严重故障情况进行了仿真分析,仿真结果验证了模型的有效性。

In recent years, the status of wind power in the power system is getting more and more important. This paper analyzes the system of variable speed constant frequency （VSCF） doubly fed induction wind generator （DFIG）, which is muhivariable, strongly coupled, nonlinear and with time-varying parameter. On the basis of the detailed derivation of its mathematical model, the paper summarizes and establishes a DFIG complete transient simulation model, gives the mathematical principle and detailed block diagram based on stator voltage oriented vector control strategy, and makes a simulation and analysis on the performance of the model in three cases： the wind is changing with time, the grid voltage slightly drops and a serious failure of the grid. The results demonstrate the validity of the model, which prove to be a good reference and basis for further studies on the fault characteristics and control strategies of wind power system.