抑制电磁干扰（EMI）新型变频应用基础研究

A novel main circuit topology of soft-switching double-PWM inverter is purposed, which combines the three-phase PWM converter with the three-phase PWM inverter to realize bi-direction flow of energy between motor and power supply. It not only restrains electromagnetic interference effectively, but also improves power factor greatly, so it realizes the restrain of harmonics pollution and the reduction of switching dissipation. Creative research findings on the project include a novel main circuit topology, a control strategy of alternate slope saw-tooth modulation, a method of using non-zero space voltage vector to adjust movement velocity of flux linkage, a way of distinguishing current polarity without current sensor, a compensation method of current waveform distortion according to the characteristic of flux linkage, a phasor adjusting method with current feedforward control for improving the dynamic performance of phase and amplitude control, and etc. Research works have been done as fellow: an invention patent of soft-switching PWM inverter, a monograph, one paper published and two papers accepted on IEEE international conference, four papers accepted on CES IMECE, ten papers published and four papers accepted on national core journals. Two students have been awarded master degree and graduated, three doctor candidates are still on their research and will try for doctor degree in September, 2004. The achievements are applicable for various AC motor drive systems, its superiority can be shown particularly in such cases as elevator driver system with potential energy or high voltage large capacity inverter. Partial achievements have been applied to the project of 'Soft-switching PWM Inverter with High Performance' at Shanghai Shinyuan Inverter Electric Co. Ltd, and the project of 'Research on Soft-switching Double-PWM Inverter with High Power Factor' that has been supported by Delta Power Electronics Research & Education Foundation, 2002.

提出在PWM变频中抑制电磁干扰理论，把功率因数校正和PWM变频融于一体，建立一套新型交－直－交变频调速的分析设计方法。提出的新型能量耦合模式和软开关PWM逆变有新意，新捅淦档魉倬哂懈咝矢吖β室蚴恳种频绱鸥扇牌轿鹊魉俚攘己眯阅堋Ｊ凳┍鞠钅慷晕夜绻ぱЭ平胶投皇兰凸实缌Φ缱痈呖萍汲志谜接凶胖匾恼铰院涂萍家庖濉?.