基于空间矢量和特定消谐脉宽调制的三电平逆变器调制方法

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摘要基于三电平高压逆变器中同时应用空间矢量脉宽调制(SVPWM)和特定消谐脉宽调制(SHEPWM)的混合调制方法,即高频时采用SHEPWM,低频时采用异步SVPWM,避免了低频时SHEPWM存储量变大和SVPWM在高频时谐波特性变差大的缺点,充分发挥了二者的优点,使逆变器在整个工作范围内都可以有效抑制低次谐波,得到较好的输出波形.同时为保证切换过程中电流和电压没有跳变,提出了一种使得二者之间平滑切换的方法.最后,采用PSIM对基于SHEPWM和SVPWM的混合调制方法进行了仿真研究,并在实际NPC三电平逆变器控制平台上进行了实验,对所做的理论分析进行了验证.

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	李世军
	罗隆福
	佘双翔
	刘星平
	施晓蓉

关键词 ： NPC三电平逆变器, 空间矢量脉宽调制, 特定消谐脉宽调制, 混合调制

Abstract：A novel hybrid PWM method is proposed, which uses asynchronous SVPWM at low frequency and SHEPWM at high frequency, thus in the whole output frequency range the low order harmonic is suppressed effectively and high quality output waveforms are obtained. This paper studies the cause of jumping and gives the corresponding solution, which assures the smooth switching between SVPWM and SHEPWM, At last the proposed PWM method is simulated with PSIM software and experimentally verified through the three-level NPC inverter ASD systems,the theoretical analysis done by the verification.

Key words： Three-level NPC inverter space vector pulse width modulation selective harmonic elimination pulse width modulation hybrid PWM method

收稿日期: 2014-03-27 出版日期: 2015-09-14

PACS:

TM315

基金资助:国家自然科学基金(51377001,51077044,51077046),湖南省自然科学基金(10JJ9012),国家电网重大科技专项(5216A014007V)和湖南省科技计划(2012GK3080)资助项目

作者简介: 李世军男,1982年生,博士研究生,讲师,研究方向为交直流电能变换理论与新技术,整流供系统分析控制与综合节能,高压直流输电和电气化铁道等方面的研究.罗隆福男,1962年生,教授,博士生导师,研究方向为现代电器设备的设计,优化,新型换流变压器的研制及对应的高压直流输电新理论研究.

引用本文:

李世军,罗隆福,佘双翔,刘星平,施晓蓉. 基于空间矢量和特定消谐脉宽调制的三电平逆变器调制方法[J]. 电工技术学报, 2015, 30(12): 34-40. Li Shijun,Luo Longfu,She Shuangxiang,Liu xingping,Shi Xiaorong. A Method of SVPWM and SHEPWM Applied to Three-Level NPC Inverter. Transactions of China Electrotechnical Society, 2015, 30(12): 34-40.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I12/34

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