电源变换器在风力发电中的技术研究

The Study of Power Inverter for Wind Power Generation

随着风力发电技术的快速发展,高性能的电源变换技术受到人们的广泛关注。在此采用基于DSP的数字控制技术,设计了一个新型的AC/DC/AC电源变换器。该变换器前级为三相两开关Boost PFC电路,采用DSP产生两路相位差为180°频率可变的PWM信号进行控制,实现了部分解耦控制,能有效减少输入电流的谐波含量并提高功率因数;后级为三相PWM电压源型逆变电路,采用DSP实现不对称规则采样法完成三相SPWM,输出电压波形接近正弦且减小了谐波电流。在此基础上,进行相关实验,并对结果进行分析。

With the wind-powered electricity develop rapidly,high pertormance power conversion technology is taken more attention.A novel ACIDCIAC power inverter is given,which is controlled by DSP.The former converter uses three-phase two-switch Boost PFC circuit,and this part is controlled by two PWM signal with the 180° phase difference and variable frequency generated by the DSP.h realizes part-decoupling control.Thus ,rectifier converter has the merits such as sinusoidal input current waveform ,high input power factor and device.The later circuit uses threephase PWM voltage source inverter, and this part is controlled by the SPWM signal generated by DSP with asymmetry-regulation-sampling method.Thus, the output voltage waveform of the inverter is sinusoidal, and the harmonic current can be reduced.On this basis,a power converter is completely designed and successfully developed,and experiments are done to prove the correction of the design.