一种新的准自然采样SPWM方法及其应用  

A novel mothod and its appliaction for SPWM

作　　者：孟建华[1] 毛惠丰[2] 陈增禄[2] 施杰[1] 

机构地区：[1]西安工程大学电子信息学院,陕西西安710048 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《纺织高校基础科学学报》2007年第3期318-322,共5页Basic Sciences Journal of Textile Universities

摘　　要：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.论述了该方法的基本原理,导出了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比较.仿真结果表明,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,3种方法的基波幅值、THD将趋于一致.将规则采样线性外推的准自然采样SPWM方法应用于一台单相电压型8重化9电平逆变器中进行了实验研究.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 another two methods, and the THD is lower than nature sampling. As the ratio of carrier wave increasing at the given range, the amplitude of fundamental and THD of quasi- nature sampling SPWM will accord with another two methods＇. Finally, experiments results are obtained in a single-phase valtage source inverter with the novel method.

关 键 词：SPWM 规则采样法/自然采样法 线性外推法 谐波分析 THD 

分 类 号：TM464[电气工程—电器]