差分进化算法用于带辅助臂的NPC逆变器PWM调制  

PWM modulation of NPC inverter with auxiliary arm using differential evolution algorithm

作　　者：李军军[1,2] 王世明[1] 黄有方[2] 匡兴红[1] 陈平 

机构地区：[1]上海海洋大学工程学院 [2]上海海事大学科学研究院,上海201306 [3]沪东中华造船(集团)有限公司,上海200129

出　　处：《工业仪表与自动化装置》2013年第3期3-7,共5页Industrial Instrumentation & Automation

基　　金：上海市教委科研创新项目(09YZ273);上海市科委"创新行动计划"项目(09dz1202400)

摘　　要：为降低三相高压变频系统的总谐波畸变率,采用带辅助臂的中性点钳位型NPC逆变器。该逆变器在三电平NPC逆变器基础上,仅增加了少量的器件,可实现五电平相电压。针对该逆变器输出电平不完全独立的特点,提出一种脉冲宽度调制方法。分析了三相变频系统中Us,Eg,Er的谐波。分别在恒Us/ω、恒Eg/ω、恒Er/ω控制的情况下,采用差分进化算法对逆变器开关时刻进行优化,获得了较好的谐波优化结果。To reduce the total harmonic distortion of three-phase high-voltage frequency-conversion system, neutral point clamped inverter with auxiliary arm is applied. This inverter can export five-level phase voltage while only small quantities of elements are added. A sort of pulse width modulation is put forward for this inverter in which output voltages are not absolutely independent. The harmonics of Us, E, Er in three-phase frequency-conversion system are analyzed. Differential evolution algorithm is ap- plied to switch times optimization in this inverter while Us/ω, Eg/ω, Er/ω are constant respectively. The results show that harmonics are well limited.

关 键 词：中性点钳位 辅助臂 脉冲宽度调制 差分进化 

分 类 号：TM464[电气工程—电器]