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研究生： 賴建翔
Chien-Hsiang Lai
論文名稱： 新型控制之主動式相間變壓器應用於 二十四脈波轉換器
A Novel Control for Active Interphase Transformer Used in a 24-pulse Converter
指導教授： 楊宗銘
Chung-ming Young
口試委員: 羅有綱
Yu-kang Lo
賴炎生
Yen-shin Lai
學位類別： 碩士
Master
系所名稱： 電資學院 - 電機工程系
Department of Electrical Engineering
論文出版年： 2010
畢業學年度： 98
語文別： 英文
論文頁數： 86
中文關鍵詞： 主動式相間變壓器 、二十四脈波轉換器 、Side-extended變壓器 、修正補償策略 、彈性負載架構
外文關鍵詞： Active interphase transformer, 24-pulse converter, side-extended transformer, modified compensation strategy, flexible load configurations
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    • 本文將主動式相間變壓器應用至二十四脈波轉換器系統中，透過注入補償電流於主動式相間變壓器的二次側，用以改善電源端的總電流諧波失真。系統使用兩個相同的Side-extend變壓器用以產生四組相位各差十五度的三相電源供給四組六脈波轉換器，且只需自兩個第一級相間變壓器中選擇任意一個加入二次側繞組，使其成為主動式相間變壓器，而用以產生注入電流的變流器只需非常低的容量[1.16% ( )]，約為應用於十二脈波轉換器系統時的一半，當變流器發生故障無法注入電流時，系統仍可維持二十四脈波的低諧波失真輸入電流。本文提出一修正補償策略，改善了傳統控制策略會造成三相不平衡補償的缺點，亦分析了主動式相間變壓器注入電流的限制，避免系統產生非預期的動作。此系統非常適用於本為十二脈波轉換器系統且有電力需求擴增的場合，系統可對彈性負載架構進行補償，補償效果隨著負載不平衡程度而有所不同，提供使用者配置負載時作為參考。本文建立一6kW系統，並透過模擬與實作結果驗證其可行性。
    關鍵詞：主動式相間變壓器、二十四脈波轉換器、Side-extended變壓器、修正補償策略、彈性負載架構

    This thesis applies active interphase transformer (IPT) to a 24-pulse converter system. The proposed scheme improves the overall input line current conditions by injecting compensation current into the secondary winding of the active IPT. The proposed scheme applies two identical side-extended transformers to provide four three-phase voltage sources with phase-shift. Only one of the two first-stage IPTs added the secondary winding to be active IPT. The kVA rating of the current-controlled inverter is very small (1.16%), just half of that applied in a 12-pulse converter system. When the inverter malfunctions, the overall input line current still can work as in the 24-pulse condition. This thesis proposed a modified compensation strategy to overcome the unbalanced compensation result of the previous study. The constraint on the injected current is also analyzed to avoid unwanted performance. Moreover, this proposed scheme can operate in flexible load configurations. The compensation effects are not identical with variously unbalanced load conditions. This thesis provides criteria for load arrangements to obtain a better line current condition. A 6kW prototype is built for test. Both simulation and experimental results demonstrate the validity of the proposed scheme.
    Keywords: Active interphase transformer, 24-pulse converter, side-extended transformer, modified compensation strategy, flexible load configurations

    摘要 I Abstract II Acknowledgement III Table of Contents IV List of figures VII List of tables X Chapter1 Introduction 1 1.1 Background and motivation 1 1.2 Objective of the thesis 2 1.3 Organization of the thesis 3 Chapter2 Harmonic mitigated with IPTs 5 2.1 Introduction 5 2.2 The uncontrollable IPTs 5 2.2.1 The traditional IPTs 6 2.2.2 The multi-tap IPTs 10 2.3 The controllable IPTs 14 2.3.1 The controllable multi-tap IPTs 15 2.3.2 The active IPTs 17 2.4 Summary 20 Chapter3 Side-extended transformers applied in a 24-pulse converter 22 3.1 Introduction 22 3.2 Analysis of the side-extended transformers 22 3.2.1 Analysis of phase-shifting angle 23 3.2.2 Analysis of winding currents 26 3.3 An application of side-extended transformers in a 24-pulse converter 28 3.4 The kVA rating of side-extended transformers 32 3.5 Summary 34 Chapter4 Active IPT using in a 24-pulse converter 35 4.1 Introduction 35 4.2 Analysis of operation 35 4.3 Three-phase balanced control strategy 40 4.4 The restriction on the injected current 43 4.5 The kVA rating of the inverter 45 4.6 Load split 46 4.7 Summary 50 Chapter5 Simulation and experimental results 51 5.1 Introduction 51 5.2 Hardware configuration 52 5.2.1 Digital signal processor (TMS320F2812) 52 5.2.2 The current-controlled inverter 53 5.2.3 The peripheral circuits 55 5.3 Software programming 57 5.3.1 Analog-to-digital conversion ratio 57 5.3.2 Program designing with flow charts 58 5.4 Simulation and experimental results 61 Chapter6 Conclusion and future work 82 6.1 Conclusion 82 6.2 Future work 82 References 84

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