- 學位論文
具功率因數改善與類弦波直流鏈峰值電壓調控之馬達驅動器研製
Design and Implementation of Motor Drives with PFC and Quasi-Sinusoidal DC Link Peak Voltage Control
摘要
本論文提出一新型馬達驅動系統，藉由改變直流鏈電壓波形，提升馬達與驅動器之效率。此系統由升壓型轉換器與變頻器構成；前述之升壓型轉換器為一無輸出大容值電解電容之三相整流器串接一傳統升壓型轉換器來提供變頻器之直流鏈電壓。由於不使用大容值電解電容而導致三相整流器輸出電壓漣波變大，因此轉換器需具備輸入電壓對變頻器直流鏈電壓之抑制能力；升壓轉換器輸出電壓需依據馬達轉速，產生對應反電動勢之類弦波直流鏈峰值電壓且本系統經由提升直流鏈電壓之直流準位以延長馬達定功率區，因此轉換器輸出電壓需高頻寬與寬範圍。對此本文提出ㄧ控制器設計程序以達到上述需求，且相對於傳統三相整流電路，本設計亦可同時改善功率因數。 所提之方法以TMS320F28035微處理器作為控制核心，建構具2kW與200V至380V輸出電壓之動態升壓轉換器。
並列摘要
This thesis presents a novel motor drive system by changing the DC link voltage waveform to improve the efficiency of the motor and drive system. This system consists of an AC-DC boost converter and inverter. The AC-DC boost converter consists of a three-phase rectifier without the large capacitance of electrolytic capacitors, series with a conventional boost converter to provide the DC link voltage for inverter. According to none using large capacitance electrolytic capacitor which led a larger three-phase rectifier output voltage ripple, so the suppression of the effect from converter input voltage to the inverter DC link voltage is required. Boost converter output voltage based on the motor speed to generate a sinusoidal waveform that correspond to the back EMF and extend the motor constant power region via increasing the peak voltage of the DC link. So the converter needs a high bandwidth and wide ranges on output voltage. According to aforementioned, this thesis presents a controller design process to meet demands and also improve the power factor compared to conventional three-phase rectifier circuit. The inverter is driven by SVPWM. This system can achieve a lower current harmonic distortion and a higher efficiency of the overall. The experimental system is based on the TMS320F28035 microprocessor as control core and the dynamic boost converter constructed with a 2kW 200V to 380V output voltage.