两相SVPWM原理及经典两相SVPWM算法

The Theory and the Classical Algorithm of Two-phase SVPWM

分析两相电压空间矢量脉宽调制原理及其实现方法,提出了经典两相SVPWM算法,该算法根据调制比将调制模式分为线性调制模式、过调制模式Ⅰ和过调制模式Ⅱ。重点分析了过调制模式,利用傅立叶分析给出对应模式下参考角的推导方法,计算了在过调制模式下的输出相电压各次谐波幅值。经典两相SVPWM算法能实现电压空间矢量调制由线性调制模式到过调制模式直到方波的连续过渡,实现了全调制区域的运行,最大限度地利用了直流电压。

The theory and implementation method of two phase SVPWM was analyzed while the classical algorithm of the two phase SVPWM is proposed in this paper. The classical two phase SVPWM algorithm divided the SVPWM into three modes depending on the modulation index（MI）： linear modulation, over modulation mode I and over modulation model II. Then, the over modulation mode was focused, and the reference angle of corresponding mode was given from the Fourier analysis. The harmonic amplitude of the output phase voltange was computed during over modulation mode. Adopted with the algorithm of the two phase SVPWM, continuous control of the output voltage of voltage space vector for PWM inverter could be realized from linear modulation mode to over modulation mode until the max value of the quadrate wave mode was reached, so as so the direct current voltage be used in the maxilnum.