新型双随机PWM方法及其仿真分析  

A Novel Dual Random PWM Scheme and Its Simulation Analysis

作　　者：吴豪鹏 潘庭龙 吴定会 纪志成 Wu Haopeng;Pan Tinglong;Wu Dinghui;Ji Zhicheng(The Internet of Things Technology Application Engineering Research Center of the Ministry of Education,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学物联网技术应用教育部工程研究中心,江苏无锡214122

出　　处：《系统仿真学报》2018年第9期3451-3456,共6页Journal of System Simulation

基　　金：国家自然科学基金(61672266;61572237)

摘　　要：针对随机脉冲位置脉宽调制(PWM)的功率谱密度中依然存在离散谱成分,提出一种新的双随机PWM策略。该方法在调制比M≥0.7时,采用V(0 0 0)作为零矢量,M<0.7采用V(1 1 1)作为零矢量的双零矢量随机脉冲位置调制策略的基础上,通过增加开关频率的随机化,实现开关频率与脉冲位置分别随机变化。引入WELL算法生成随机数,以增强双随机PWM输出的随机变化程度。仿真结果表明,该方法可以有效抑制输出线电压和相电流的高次谐波,在整个频域范围内具有更加均匀的频谱。In the consideration that random pulse position pulse width modulation（PWM） still contains discrete spectral components, a novel strategy of dual randomized modulation is presented. The proposed method is based on dual zero vector random pulse position PWM, in which zero vector is selected as V（1 1 1） when M≥0.7 and as V（0 0 0） when M〈0.7, and the random variation of the pulse position and the switch frequencyis realized by increasing the switch frequency randomization. To insure better random variation degree of dual random PWM,WELL algorithm is introduced to generate random number. Simulation results show that the proposed scheme can reduce the dominant harmonic clusters of the output line voltages and the phase currents effectively, and has well-distributed spectrum in the whole frequency interval.

关 键 词：随机PWM 开关频率 WELL算法 谐波抑制 

分 类 号：TM464[电气工程—电器]