- 學位論文
三相AC-DC轉換器簡化成單相DC-DC轉換器之設計與應用
The Design and Application of the Three Phase AC-DC Converter Simplified to the Single Phase DC-DC Converter
摘要
三相AC-DC轉換器廣泛應用在工業上，主要用來改善輸入電流品質和調整輸出電壓大小，藉由開關的動作行為，使輸入側電壓與電流能達成同相位。隨著越來越多新型三相AC-DC電路產生，三相AC-DC轉換器一般都經過D-Q軸轉換分析，在D-Q軸下，其狀態空間方程式相互耦合，導致控制系統的設計仍然困難與複雜。一般文獻對單相DC-DC轉換器的小訊號等效模型、轉移函數與控制器設計已有完整且詳細的研究與分析，但是對三相AC-DC轉換器的小訊號等效模型、轉移函數與控制器之設計卻較不完整，缺乏其完整性。 本文利用平衡三相輸入電壓波形特性、三相三臂AC-DC拓樸電路的對稱架構與RMS等效法後，提出一個建模簡化的新方法，歸納出一套建模簡化步驟。而提出一套三相AC-DC轉換器建模簡化方法為本文目標，目的是為了讓單相系統的知識可延伸使用到三相AC-DC轉換器簡化模型。 本研究結果顯示三相AC-DC轉換器經過等效簡化後，使單相DC-DC轉換器的理論可延伸到三相AC-DC轉換器簡化模型使用，可作為三相AC-DC轉換器的控制系統設計與分析之參考。
並列摘要
Three-phase AC-DC converters are gradually and widely being used in industry mainly for the improvement of the quality of the input current and adjust the magnitude of output voltage. By using the switch, the voltage and current on the input side are adjusted to be in-phase. As more and more types of three-phase AC-DC circuit topologies have been invented, usually the three-phase AC-DC converters are analyzed through the D-Q transformation. In the D-Q domain, the State Space equation are mutually coupled, thus the design of the control system is still difficult and complicated. In references, usually only the small signal equivalent model, the transfer function and the controller design of single-phase DC-DC converters are described in detail. However, the study of those for the three-phase AC-DC converter has not been dealt with in depth. The object of this paper is to propose a simplified method for modeling the three-phase AC-DC converters in order to extensively apply the knowledge of single-phase DC-DC converters to the simplified modeling of three-phase AC-DC converters. The paper shows that after the simplification is completed, the principles which work for single-phase DC-DC converter are able to be applied to the simplification model of three-phase AC-DC converter as well. The paper would be a helpful reference to people who need to design and analyze the control systems of the three-phase AC-DC converter.