Abstract
由於考慮到學術性價值與廣泛之應用，本論文內容主要針對交流變交流轉換器及其在感應馬達驅動器之應用作一深入研究。本論文主要貢獻可綜合如下七點：第一點，提出一種升壓式交流變直流轉換器，應用於交流變交流轉換器之前級，以達到較高之電力品質、雙向電力流動及較低之輸出漣波電壓。第二點，提出另一種具有升╱降壓功能、較簡單之控制與電力電路及較高電力品質之交流變直流轉換器，作為交流變交流轉換器之前級。第三點，提出一種應用於感應馬達驅動器之適應型直流鏈接電壓交流變交流轉換器，可藉由降低變流器中之零電壓向量，而得到最佳直流鏈接電壓，俾使此一新型交流變交流轉換器中之變流器開關切換頻率得以最小化，達到較高之轉換效率。第四點，提出一軟式切換之矩陣轉換器，以解決現有矩陣轉換器之缺點。例如，具較低的轉換效率、閘極信號需時間鎖定電路、輸出電壓易受電源電壓不平衡與失真之影響、較複雜之控制電路及需緩衝電路加以保護等。此外，本論文所提出之軟式切換矩陣轉換器，亦可應用於向量控制之感應馬達驅動器。第五點，提出一種應用於感應馬達驅動器之經濟型直流鏈接交流變交流轉換器，此新型交流變交流轉換器中之變流器僅需三個主動式開關，亦是目前具較少主動式開關及最佳輸出品質之變流器。另外，此一新型交流變交流轉換器應用於感應馬達驅動器，仍可達到良好之性能。第六點，應用前述之經濟型直流鏈接交流變交流轉換器，而提出一新型適應型感應馬達向量控制器。二十幾年來，感應馬達向量控制器受馬達參數之影響，一直沒有良好之解決方法。本論文利用第五點所提之交流變交流轉換器之結構，而提出一適應型合成磁場導向控制器，可成功地解決此一問題。第七點，提出另一種適應型合成磁場導向控制器，可應於一般六個主動式開關變流器之感應馬達驅動器，以消除感應馬達參數變化之影響。Due to the academic value and the wide applications, theobjective of this dissertation is centered around the studyof AC to AC converters as well as the correspondingapplications to induction motor drives. The main contributionsof this disserta- tion are : (1) A new step up AC/DCconverter is proposed as a pre-stage of the AC/AC converter toachieve high input power quality, bidirectional power flow,and very low output voltage ripple. (2) Another new AC/DCconverter is proposed as a pre- stage to achieve both step upand step down function, simpler control and power circuits aswell as high input power quality. (3) An adaptive DC-linkvoltage AC/AC converter is proposed for induction motordrives. By extracting the zero vector quantity, the newconverter is able to adapt its DC link voltage tominimize the unnecessary switching actions of theinverter part. Hence, better efficiency can be achieved.(4) A soft switching matrix converter is proposed toeliminate the dis- advantages of existing matrix converterssuch as lower efficien- cy, requiring lock-out time of the gatesignals of the converter, sensitive to unbalance ordistortion of the source voltage as well as complicatedcontrol and snubber circuit. (5)nother economic DC link AC/ACconverter is proposed forduction motor drives. The new AC/ACconverter requires onlyee active switches for the inverterportion. In addition, application of the new AC/AC converterto the induction motor drive can still achieve highperformance. (6) Based on the previous economic DC-linkAC/AC converter, a novel adaptive vector controller isproposed for the induction motor drive. (7)nstead of usingthe previous new AC/AC converter, a modifieddaptivemagnetizing-flux-oriented controller is also proposedr thecommonly used induction motor drive to eliminate thefluenceof parameter changes.