新型多重载波无死区SPWM  

A Novel Multi-carrier No-dead-zone SPWM

作　　者：宋崇辉[1] 刁乃哲 薛志伟[1] 孙先瑞 关健宁[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁省沈阳市110004

出　　处：《中国电机工程学报》2014年第12期1853-1863,共11页Proceedings of the CSEE

基　　金：国家自然科学基金项目(60974141;61273010);辽宁省自然科学基金项目(20092007)~~

摘　　要：传统正弦脉宽调制(sinusoidal pulse width modulation,SPWM)加入死区后会产生逆变器输出电压能力下降、出现相位偏差和电流波形畸变等问题。为了改善逆变器交流侧电流输出波形,解决传统SPWM加入死区后出现的问题,提出一种新型多重载波无死区SPWM调制方法,该方法对调制波采用多重载波调制,产生多路驱动信号,并把电流矢量变换到dq轴进行滤波,根据滤波后电流的方向,采用简单的逻辑运算确定开关管的驱动信号,实现无死区效应的调制方法。该调制方法解决了传统SPWM+死区方法中死区效应导致波形畸变的问题,从根本上解决了死区问题,逆变交流侧输出波形不畸变,正弦度良好。通过理论分析和实验验证该方法的正确性。The sinusoidal pulse width modulation （SPWM） plus dead time lowers the system output voltage capability and leads to the phase deviation and waveform distortion. A novel no-dead-zone multi-carrier sinusoidal pulse width modulation （NODZ SPWM） was proposed to solve problems caused by the classical SPWM plus dead time and improve current output waveform on the AC side of the inverter. This method uses the multiple carriers to modulate the modulating waves and generate multiplexed driving signals. Then the current vector on dq-axis is filtered. According to the current direction after filtering, some simple logic operations are used to determine the switch-driving signal. This modulation strategy has no dead-time effects and significantly improves the current waveforms on the AC side of the inverter as well as the performance of the induction motor. Theoretical analysis and experimental results verified the validity of this method.

关 键 词：多重载波 死区效应 电流矢量dq轴滤波 无死区SPWM 载波相移时间 

分 类 号：TM46[电气工程—电器]