基于规则采样线性外推的准自然采样SPWM方法

Research on a Quasi-Nature Sampling SPWM Waveform Formation and Simulation based on Linearization Extrapolation of Regular Sampling

提出了一种基于规则采样线性外推的准自然采样SPWM新方法。详细论述了该方法的基本原理,早出了SPWM开关点方程。对该方法进行了仿真研究,并与传统的自然采样法和规则采样法进行了比较。结果表明,该方法的输出基波幅值较另两种方法更大,THD较自然采样法还要小。当载波比增大到一定的范围时,三种方法的基波幅值、THD趋于一致。

A new quasi-nature sampling SPWM based on linearization extrapolation of regular sampling is presented. Its principle and the equation of switch-point are introduced. The new method is simulated, and compared with nature sampling and regular sampling. The results show that the amplitude of fundamental is higher than that of the others, and the THD is lower than that of Nature sampling. As the ratio of carrier wave increasing at the given range, the amplitude of fundamental and the THD of quasi-nature sampling SPWM will accord with the others.