一种改进的生成SPWM波形的等面积算法

SPWM变频器巳成为异步电动机变频调速的主要电源形式，为了减少SPWM电压波形的谐波，提高电压波形的质量，在分析巳有方法的基础上提出了一种改进的SPWM波形的等面积算法，即以采样周期的几何平均中心为SWPM波矩形脉冲中心的方法，并对该方法进行了谐波分析，最后给出了用数字信号处理器对该算法的实现，分析结果表明，该算法的谐波分量明显减少，谐波质量明显提高。

An Improved Equiarea Algorithm for Generating SPWM Wave

The inverter of sine pulse width modulation (SPWM) has become the main form of power supply. In order to decrease the harmonics of the SPWM voltage wave and to improve the quality of voltage wave, an improved equiarea algorithm to realize SPWM wave is proposed. In the improved equiarea algorithm the geometry center of sampling period is regarded as the rectangular pulse center of SPWM wave. The harmonics analyses of the algorithm have been done. Finally, the realization of the algorithm based on digital signal processor is given. The analyses results show that the harmonics of this algorithm is decreased obviously and the quality of wave is improved obviously. This algorithm can be used in real time operation to realize sine pulse width modulation.