改进的正弦脉宽调制控制算法综述

Overview of improved sinusoidal pulse width modulation control algorithms

正弦脉宽调制(SPWM)是逆变电路常采用的调制方法。合理的采用SPWM控制算法,能够减少逆变电路的低次谐波含量,降低总谐波系数(THD),提高直流电压的利用率,对改善逆变电路的输出性能具有重要意义。在介绍正弦脉宽调制(SPWM)基本原理的基础上,根据目前SPWM波形主要由各种微处理器在软件支持下产生的特点,对一些改进的算法进行研究,详细分析了面积中心等效法、切线法、峰值型采样方式几种典型的改进控制算法,并讨论了各自的优缺点探讨了这些方法在不同领域的应用。

The reasonable use of sinusoidal pulse width modulation （SPWM） control algorithm can reduce the low order harmonic content of the inverter circuit, decrease the total harmonic coefficients （THD） as well as improve the efficiency of DC voltage, which is important to improve the output performance of the inverter circuit. The basic principles of the sinusoidal pulse width modulation （SPWM） were introduced, the improved algorithms on the basis of the traditional SPWM control algorithms were studied, and several classical improved control algorithms were summarized. The area center equivalent, tangent method, peak value sampling method were described in detail, and their advantages and disadvantages of these methods in different fields were discussed.