永磁直驱风电变流器控制策略及仿真研究

根据矢量控制原理提出了机侧和网侧PWM变流器的控制策略,分析了永磁直驱风电系统双PWM变流器的电路结构及其工作原理,建立了永磁直驱风电系统中包括风力机、传动系统、永磁同步发电机、双PWM变流器等各部分的数学模型;在MATLAB/SIMULINK仿真环境中建立了永磁直驱风电系统的仿真模型并进行了动态仿真。仿真结果表明:采用双PWM变流器的永磁直驱风电系统具有优良的动、静态性能,可以良好的控制永磁同步发电机,最终输入电网的电压、电流波形接近正弦且谐波含量小。验证了系统仿真模型的正确性和所提出双PWM变流器控制策略的有效性。

Control strategies and simulation research of direct-drive permanent-magnent wind power system

The control strategies of converters at generator and power grid sides were put forward according to the vector control method,the circuit structure and working principle of dual PWM inverters in direct-drive permanent-magnent wind power system were analyzed.The mathematical models including wind turbine model,drive train model,permanent magnet synchronous generator model and the dual PWM converter model were built.The simulation model of the wind power system was built in Matlab/Simulink software environment,and the dynamic simulations were performed.The simulation result shows that the model has good dynamic and static performance,and can control the PMSG very well.The shapes of voltage and current into the grid are close to the sine and the content of harmonic is little.The simulink result also verifies the correctness of the model and the validity of the dual PWM converter’control strategies.