| Summary: | 碩士 === 元智大學 === 電機工程學系 === 106 === A multi-rate filtered PWM(MRFPWM) is proposed in this thesis to improve the harmonics distortion and the switching loss of the voltage source inverters(VSIs). In the traditional CBPWM, although we can reduce the harmonics distortion by increasing the switching frequency, such a method also leads to more switching loss. Therefore, we develop the MRFPWM, which can reduce the harmonics distortion by increasing the calculative frequency rather than switching frequency, to reduce the current harmonics distortion. Pratically the current signal is used to control the pulse-width modulation. Therefore, we have to adopt a PI current controller in the PWM structure to make sure MRFPWM can be used to control a motor. Further, an experimental platform of five-phase VSI drive is built . As validate the effectiveness of MRFPWM for comparing with traditional CBPWM, both simulations and experiments reducing the current harmonics distortion.
|
|---|
