摘要
在三相SPWM变频器中,一般采用分段同步调制模式实现变频控制,当进行载波比切换时,变频器的输出电压可能发生突变。通过对载波比切换前后的变频器输出电压进行双重傅里叶变换,并比较切换前后输出电压中各谐波分量的变化,提出了调制波零相位时刻进行载波比切换的方法。给出了在不同时刻进行载波比切换的仿真结果,实验结果表明,在调制波零相位处能够实现载波比的平稳切换。
In the three phase SPWM converter , it is better to use subsynchronization modulation in variable frequence control.But the converter＇s output voltage may change abruptly when the frequence modulation ratio change. The converter＇s output voltage before and after the switch were used to carry out double fourier transform. A method of switch at zero phase of modulation wave was proposed after comparing harmonic component before and after the carrier wave ratio change.The system was simulated at different switch time. The results showe that stable switch of carrier wave ratio can be realized at zero phase of carrier wave.
出处
《电气传动》
北大核心
2014年第2期15-18,共4页
Electric Drive
基金
河南省科技攻关计划项目(122102210102)
关键词
分段同步调制
载波比
正弦脉宽调制
双重傅里叶变换
subsection and synchronization modulation
carrier wave ratio
SPWM
double fourier transform
