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研究生： 賴玠元
Lai, Chieh-Yuan
論文名稱： 具自我平衡五階變流器及高昇壓錯相式轉換器之電能轉換系統
A New Self-Balanced Five-Level Inverter Integrated with a High Step-Up Interleaved Converter
指導教授： 楊宏澤
Yang, Hong-Tzer
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： 2011
畢業學年度： 99
語文別： 英文
論文頁數： 76
中文關鍵詞： 高昇壓 、錯相式昇壓轉換器 、零電壓切換 、多階變流器 、電壓平衡 、垂直平移脈波寬度調變
外文關鍵詞： High step up, interleaved boost converter, zero-voltage-switching, multilevel inverter, voltage balancing, phase disposition PWM strategy
相關次數： 點閱：167  下載：5 
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    • 本文旨在設計一電能轉換系統，包括前級高昇壓錯相式轉換器及後級具自我平衡五階變流器，本系統將低輸入直流電壓(20至30 V)轉換為110V的交流輸出電壓，並對負載提供良好的電力品質及系統穩定度。藉由耦合電感及倍壓技術，本文所提DC-DC轉換器不需太大責任週期即可達成高昇壓比，而錯相架構亦可有效降低所提轉換器之輸入電流漣波，此外由於加入一個額外的共振電感，轉換器上的功率開關於導通期間均無切換損失，且功率二極體亦無逆向回復電流，因此轉換器的效率可獲得改善。本文亦提出一由全橋變流器與兩組輔助電路所組成之自我平衡五階變流器，以提供兩條路徑輪流對直流輸入電容放電，藉此改善傳統多階變流器電壓不平衡之狀況。透過平衡控制，所提變流器可提供高電力品質之電流以供應負載，且使用較小的直流電容和輸出濾波電感，故亦可減少本系統體積。本文亦透過一輸入電壓25V、輸出交流電壓110V且額定為400W之實體電路，以驗証所提變流器之理論，根據模擬與實驗結果證實，本文所提自我平衡五階變流器於滿載情況下，其電流總諧波失真率為1.43%，且直流側電容電壓的漣波降至3%以下，同時本系統輸入電流漣波僅約3%，最高系統效率可達87.6%。

    The thesis proposes an energy conversion system, which integrates a high step-up interleaved Boost converter and a self-balanced five-level inverter. The proposed system transforms low DC voltage, which ranges from 20 to 30V, to AC voltage of 110V for supplying the loads with high power quality and high reliability. By employing coupled inductor and voltage multiplier topologies, the proposed DC-DC converter achieves high voltage gain without large duty ratio used. Besides, the input current ripple of the proposed converter can be greatly reduced due to the interleaved structure. Moreover, by adding an auxiliary inductor, both Boost switches are turned ON with ZVS condition and the diode reverse recovery problem is alleviated, which further improves the system efficiency. The proposed self-balanced five-level inverter, which comprises two auxiliary circuits and a full-bridge inverter, has two conducting paths to alternately discharge the two input DC capacitors. Therefore, the unbalanced DC voltage that often occurs in the conventional five-level inverter is avoided. Through the balanced control, the proposed inverter offers a near perfect output current to supply the load, and the size of the proposed system can be reduced due to small capacitances and inductances are needed. A 400W, 25V input-voltage, 110VAC output-voltage prototype is implemented to verify the proposed energy conversion system. According to the simulation and experimental results, the THD of output current is 1.43% at full load condition and the voltage ripple of input DC capacitors in the proposed five-level inverter is less than 3%. Besides, the proposed system has low input current ripple of about 3%, and maximum efficiency up to 87.6%.

    ABSTRACT I 摘 要 III 誌 謝 V CONTENTS VI LIST OF FIGURES X LIST OF TABLES XIV CHAPTER 1. INTRODUCTION 1 1.1. Backgrounds and Motivations 1 1.2. Review of Literature 2 1.3. Research Method 3 1.4. Contribution of the Thesis 5 1.5. Organization of the Thesis 6 CHAPTER 2. EXISTING ENERGY CONVERSION SYSTEM 8 2.1. Introduction 8 2.2. Types of High Step-Up DC-DC Converters 9 2.2.1. Boost-Flyback Converter 9 2.2.2. Interleaved High Step-Up Converter 10 2.2.3. ZVT Boost Converter 10 2.3. Existing ZVS Auxiliary Circuits 11 2.4. Multilevel Inverters 13 2.4.1. Diode Clamped Inverter 14 2.4.2. Cascade H-Bridge Inverter 16 2.4.3. Five-Level Inverter 18 2.5. Summary 20 CHAPTER 3. PROPOSED ENERGY CONVERSION SYSTEM.. 21 3.1. Introduction 21 3.2. Proposed System Configuration 21 3.3. Interleaved High Step-Up Converter 23 3.3.1. Circuit Configuration 23 3.3.2. Operation Principles 24 3.4. Design Analysis of the Proposed Converter 34 3.4.1. Voltage Gain Expression 35 3.4.2. Design of Auxiliary Inductor Lr 36 3.4.3. Limitation of Turns Ratio 36 3.4.4. Considerations of Input Current Ripple 37 3.4.5. Voltage Stress Analysis 37 3.5. Proposed Self-Balanced Five-Level Inverter 38 3.5.1. Circuit Structure 38 3.5.2. Phase Disposition Modulation 40 3.5.3. Operation Principles 43 3.6. Summary 48 CHAPTER 4. SIMULATION AND EXPERIMENTAL RESULTS 50 4.1. Introduction 50 4.2. Descriptions of the Proposed Prototype Circuit 50 4.2.1. Specifications of the Prototype Circuit 51 4.2.2. Power Switch Driving Circuits 52 4.2.3. Feedback Circuits 53 4.3. Simulation Results 55 4.4. Experimental Results 59 4.5. Summary 69 CHAPTER 5. CONCLUSIONS AND FUTURE PROSPECTS 70 5.1. Conclusions 70 5.2. Future Prospects 71 REFERENCES 72

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