扰动观察法在小型风机MPPT中的仿真研究

Simulation Study of Perturbation and Observation Method of MPPT in Small Wind Turbine

为了提高风力机发电系统的发电效率,通过调节PWM波占空比来实时改变Boost变换器升压电路的输出电压,采用扰动观察法的MPPT(Maximum Power Point Tracking)控制方法,实现对风力发电系统最大功率点的跟踪。调节永磁同步电机负载,通过改变永磁同步电机电磁转矩来调节风力机的转速,并在PSIM软件中对风力机输出功率进行仿真,得出实时最大功率曲线图。仿真结果表明,该方法较好的保证了风力发电系统能够快速、稳定和精确的跟踪到最大功率点,提高了风力机发电效率。

In order to improve the wind turbine generator efficiency of power generation system,it changes the output voltage of Boost converter in real-time by adjusting the PWM duty cycle,and uses the MPPT（maximum power point tracking） control strategy of perturbation and observation method to achieve tracking of maximum power point of the wind power generation system.Changing the load of PMSM（permanent magnet synchronous motor）,and changing the electromagnetic torque of PMSM to adjust the speed of the wind turbine.And it uses the PSIM software to simulate the output power of wind power generation.And it finds out the real-time maximum power curve of the system.The simulate results indicate that the method can ensure wind power system to realize MPPT fastly,steadily and accurately,and improve the wind power generation efficiency.