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研究生：	賴永勝 Lai, Yong-Shen
論文名稱：	具雙準位升壓轉換器與耦合電感之七階變流器 Seven-Level Inverter with Two-Level Boost Converter and Coupled Inductors
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：	2016
畢業學年度：	104
語文別：	英文
論文頁數：	78
中文關鍵詞：	多階變流器、耦合電感、多階電壓輸出之升壓轉換器、電壓平衡、數位訊號處理器
外文關鍵詞：	multilevel inverter, coupled inductors, multilevel boost converter, voltage balancing, digital signal processor
相關次數：	點閱：120 下載：2
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多數的多階變流器普遍存在增加輸出電壓階層時，其控制複雜度和元件數目亦大幅增加的問題。因此本論文提出一整合雙準位升壓轉換器與具耦合電感七階交流輸出之變流器系統，整體架構分為前級雙準位升壓轉換器與後級七階變流器兩部分。其輸入源為一直流電源，先利用前級轉換器將其升壓至成倍數關係的兩個串聯電壓後，再透過後級變流器轉換成七階輸出之交流電源。

本論文選用前級雙準位升壓轉換器，其採用較少的功率開關及二極體元件即可達成較傳統升壓轉換器多一階電壓輸出的效果，並根據開關切換狀態搭配所提簡化之控制方法，完成雙準位電壓之控制；後級變流器則應用耦合電感可在低通濾波器之前輸出近似弦波之七階交流電壓，以縮小低通濾波器的尺寸並達成較佳的總諧波失真率。其中所採用之正弦脈波寬度調變技術可除去耦合電感之激磁電流中的直流成分，以避免鐵心飽和。同時調變技術搭配耦合電感也可降低後級的導通損失與切換損失，進而提高系統整體效率。

本論文除詳述所提七階變流器系統之操作原理、穩態分析、設計與控制策略外，為驗證其效能與可行性，亦模擬並實作所提出之七階變流器系統。由實驗結果可知，在輸入電壓190 Vdc，輸出交流電壓220 Vrms，輸出在滿載2 kW條件下，其輸出電壓總諧波失真率(THD)為1.06%，且系統最高轉換效率可達97.97%。

For most multilevel inverters, both the complexity of control method and the amount of components increase drastically when increasing output voltage levels. Therefore, this thesis proposes a seven-level inverter system which is composed of a two-level boost converter and a seven-level inverter with coupled inductors. The overall system can be divided into two main parts. First, the boost converter utilizes the dc voltage as an input source and converts it into two voltages with multiple relationships. Then, the second part, namely the seven-level inverter, transforms these two voltages to a seven-level output voltage.

The two-level boost converter uses lower power switches and diodes to get one more voltage level than a conventional boost converter. For regulating the two-level voltages, this thesis proposes a simplified control strategy informed by the conduction states of switches. Furthermore, a seven-level inverter with coupled inductors can provide seven-level output voltage before a low pass filter, of which the output is nearly a sine wave, so that the system can achieve lower total harmonic distortion (THD) and minimize the size of the low pass filter. Moreover, by adopting the sinusoidal pulse width modulation (SPWM) modulation technique, the dc component existing in the coupled inductors can be eliminated and core saturation can be avoided as well. The coupled inductors with the adopted modulation technique can reduce both the conduction loss and switching loss of the seven-level inverter to thus improve the conversion efficiency.

In this thesis, the operational principles, steady-state analysis, design, and control strategies of the proposed seven-level inverter system are presented in detail. Both simulation and an experiment were implemented to verify the effectiveness and feasibility of the proposed seven-level inverter system. According to the experimental results, with an input dc voltage of 190 V, an output voltage of 220 Vrms, and a rated power of 2 kW, the THD of the output voltage was 1.06% and the maximal efficiency was as high as 97.97%.

摘要	I
ABSTRACT	II
致謝	IV
CONTENTS	V
LIST OF TABLES	VIII
LIST OF FIGURES	IX
CHAPTER 1. INTRODUCTION	1
1. Background and motivations	1
2. Literature review	3
3. Research objectives and contribution	4
4. Organization	6
CHAPTER 2. REVIEW OF MULTILEVEL INVERTERS AND MULTILEVEL DC–DC CONVERTERS	7
1. Introduction	7
2. Five-level inverters	7
2.1. Five-level inverter with coupled inductors	7
2.2. Five-level T-type inverter based on a multistate switching cell	9
3. Seven-level inverter	10
3.1. Cascaded H-bridge inverter	10
3.2. Diode-clamped inverter	12
3.3. Flying-capacitor inverter	14
3.4. Seven-level inverter with multiple voltages technique	16
4. Multilevel dc–dc converter	18
4.1. Multilevel buck boost converter	18
4.2. A dc–dc multilevel boost converter with single switch	19
5. Summary	19
CHAPTER 3. THE PROPOSED SEVEN-LEVEL INVERTER SYSTEM	20
1. Introduction	20
2. The proposed system configuration	20
3. Two-level boost converter	22
3.1. Operational principles	22
3.2. Steady-state analysis and design	26
3.2.1.	Voltage conversion and duty ratio	26
3.2.2.	Voltage and current stress analysis	30
3.3. Proposed control strategy	32
4. Seven-level inverter	34
4.1. Topology of seven-level inverter	34
4.2. Modulation technique	35
4.3. Operational mode analysis	38
4.4. Control methods	44
4.5. LC filter design	48
5. Summary	49
CHAPTER 4. SIMULATION AND EXPERIMENTAL RESULTS	50
1. Specification of the proposed inverter system	50
2. Simulation results	52
2.1. Key waveforms of two-level boost converter	53
2.2. Key waveforms of proposed seven-level inverter system	56
3. Experimental results	60
3.1. Key waveforms of two-level boost converter	61
3.2. Key waveforms of proposed seven-level inverter system	63
3.3. Transients of the proposed seven-level inverter system	66
4. THD analysis of output voltage	68
5. Efficiency of the proposed seven-level inverter system	69
6. Comparisons with the existing circuits	71
7. Summary	72
CHAPTER 5. CONCLUSION AND FUTURE WORK	73
1. Conclusion	73
2. Future work	74
REFERENCES	75


                                    

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校內：2021-07-26公開
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