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研究生： 陳佶郁
Chen, Chi-Yu
論文名稱： 全數位控制併網型雙向DC-AC轉換器之轉態探討
Study on the Transferring State of the Full Digital Grid-connected Bidirectional DC-AC Converter
指導教授： 陳建富
Chen, Jiann-Fuh
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 英文
論文頁數： 98
中文關鍵詞： 雙向轉換器 、變頻器 、功率因數修正器 、轉態分析
外文關鍵詞： Bidirectional converter, Inverter, Power factor corrector (PFC), Transferring state analysis
相關次數： 點閱：99  下載：11 
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    • 本文實現一應用於微電網之全數位化併網型雙向DC-AC轉換器。所提系統是以全橋轉換器作為主電路架構。此轉換器於DC-AC模式下輸出恆定交流電流以提供和電網併聯運轉。此轉換器於AC-DC模式下輸出恆定電壓以維持直流匯流排之穩定電壓。於AC-DC模式下，此轉換器可以作為無橋式功率因數修正器，因此，功率因數可以有效的提升。文中分析該轉換器於各操作模式下之等效電路以及動作原理。所分析之操作模式包含，變頻器模式、功率因數修正器模式以及轉態模式。此外，亦列出電路各元件之設計程序。再者，本文介紹變頻器模式下之多變結構控制法與其程式流程。文中亦介紹功率因數修正器模式下之平均電流控制法與其程式流程。最後，以實作一雙向轉換器，連接220vrms交流匯流排以及400V直流匯流排，額定功率為1kW，以實驗結果證明所提出之轉換器之可行性。

    In this thesis, a full digital grid-connected bidirectional DC-AC converter based on H-bridge converter for microgrid system is implemented. Converter outputs constant AC current during DC-AC mode for parallel operation with power grid. Converter outputs constant voltage during AC-DC mode, in which maintains the voltage level of DC bus. During AC-DC mode, converter works as a bridgeless power factor corrector. Therefore, power factor can be increased. This thesis analyze each equivalent circuits and operating modes, including inverter mode, PFC mode, and transferring state. The processes of component parameter design are also presented in this thesis. Furthermore, control methods and program flow charts of variable structure system (VSS) control in inverter mode is described. Control methods and program flow charts of average current control in PFC mode are developed. Finally, a prototype converter with 220vrms AC bus, 400V DC bus, and the rated power is 1 kW is implemented. The experimental results demonstrate the feasibility of the implemented converter.

    CONTENTS CHINESE ABSTRACT I ABSTRACT II ACKNOWLEDGEMENT III CONTENTS IV LIST OF FIGURES VII LIST OF TABLES X CHAPTER 1 INTRODUCTION 1 1.1 Background and Motivation 1 1.2 Organization of Thesis 3 CHAPTER 2 REVIEW OF TOPOLOGIES 4 2.1 Inverter 4 2.1.1 Conventional inverter 4 2.1.2 Multilevel inverter 5 2.2 Power Factor Corrector 10 2.2.1 Definition of power factor 12 2.2.2 Passive power factor corrector 13 2.2.3 Active power factor corrector 15 2.2.4 Active power factor correction method 17 2.3 Conventional Bidirectional System 20 CHAPTER 3 ANALYSIS AND DESIGN OF A GRID-CONNECTED BIDIRECTIONAL DC-AC CONVERTER 22 3.1 System Description of Grid-connected Bidirectional DC-AC Converter 22 3.2 Grid-connected Bidirectional DC-AC Converter 23 3.3 Operating Principle in Inverter Mode 25 3.4 Operating Principle in Power Factor Corrector Mode 34 3.5 Operating Principle in Transferring State 42 3.5.1 Transferring principle from inverter mode to power factor corrector mode 42 3.5.2 Transferring principle from power factor corrector mode to inverter mode 48 3.6 Component Design 53 3.6.1 Inductor design 53 3.6.2 DC capacitor and AC capacitor design 54 3.6.3 Power switches design 55 CHAPTER 4 CONTROL OF GRID-CONNECTED BIDIRECTIONAL DC-AC CONVERTER 56 4.1 Introduction of Digital Control System 56 4.2 Microcontroller Unit Introduction 57 4.2.1 Introduction of micro-control unit TMS320F38035 57 4.2.2 Block diagram of microcontroller 59 4.3 Peripheral Circuits of Digital controller 59 4.4 Control Strategy and Implement in Inverter Mode 60 4.4.1 Conventional PI control 60 4.4.2 Variable structure system control 63 4.5 Control Strategy and Implement in Power Factor Corrector Mode 64 4.6 Program Flow Chart of the Digital Controlled Grid-connected Bidirectional DC-AC Converter 65 4.6.1 Flow chart of main program 65 4.6.2 Flow chart of interrupt subroutine 66 4.7 Code Parameters Design 72 4.7.1 Interrupt frequency and pulse width modulation module parameter design 72 4.7.2 Analog to digital converter module parameter design 74 CHAPTER 5 EXPERIMENTAL RESULTS 75 5.1 Specifications of the System 75 5.2 Experimental Results of Inverter Mode 76 5.3 Experimental Results of Power Factor Corrector Mode 81 5.4 Experimental Results of Transferring State 86 CHAPTER 6 CONCLUSIONS AND FUTURE WORKS 91 6.1 Conlusions 91 6.2 Future works 92 REFERENCES 93

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