The back-to-back PWM converter is a key component in full-power wind power generation system which connects the grid to the generator. When the grid voltage rises above 10％ ,it is necessary to raise the output voltage of grid-connected inverter which in order to ensure the power deliveres from wind power generation system to the grid. An overmodulation algorithm based on SVPWM is studied, and harmonic components of the output voltage in overmodulation zones are analyzed. Finally,the algorithm is validated by Matlab/Simulink software and experiment. The results show that the algorithm can effectively raise the inverter output voltage, achieve the linear control of the inverter output fundamental voltage during the entire modulation range and finally reach six-step operation.%背靠背PWM变换器是全功率风力发电系统中连接电网和电机的核心部件.当电网电压升高10%以上时,为保证发电系统仍能向电网输送功率,必须提高并网逆变器的输出电压.在此研究了一种基于空间矢量脉宽调制(SVPWM)的过调制控制算法,并对过调制区的谐波成分进行了分析.利用Matlab/Simulink仿真软件对该算法进行了仿真验证,最后进行了实验验证.结果表明,该算法能有效提高逆变器输出电压,实现在整个调制范围内逆变器输出基波电压的线性控制,达到逆变器的六阶梯波运行状态.
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