摘要
传统三电平载波脉宽调制(pulse width modulation,PWM)每相只有一个调制波,在部分调制度和功率因数下无法完全消除三电平中点箝位(neutral point clamped,NPC)逆变器中点电位的低频波动。提出一种新的双调制波载波PWM(double modulation wave carrier-based PWM,DMWPWM)。这种新的PWM根据电压等效原则和中点平衡原则把传统PWM每相的1个调制波分解成2个调制波来实现调制,其突出优点在于能够在所有线性调制度和全部功率因数范围内完全消除三电平NPC逆变器中点电位的低频波动。详细阐述这种新PWM的基本原理,并通过仿真和实验研究验证该PWM的有效性。
Conventional three-level carrier-based pulse width modulation （PWM）, which has only one modulation wave per phase, can not eliminate low-frequency neutral point （NP） potential ripple of three-level neutral point clamped （NPC） inverter completely under some modulation index and power factor. A new double modulation wave carrier-based PWM （DMWPWM） was proposed in this paper. Based on voltage equivalent principle and NP potential balance principle, one modulation wave is decomposed into two modulation waves to implement modulation in the new PWM. One outstanding advantage of the new PWM is that low-frequency NP potential ripple can be eliminated completely regardless of modulation index and power factor. Fundamental principle of the proposed PWM was introduced in this paper, and verified by simulation and experimental results.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第33期54-59,共6页
Proceedings of the CSEE
关键词
三电平中点箝位逆变器
双调制波载波PWM
中点电位低频波动
three-level neutral point clamped inverter
double modulation wave carrier-based pulse-width modulation
low-frequency neutral point potential ripple
