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研究生: 石德春
Der-Chun Shih
論文名稱: 二十四脈波轉換器之諧波補償策略
A Harmonic Compensation Strategy for a 24-Pulse Converter
指導教授: 楊宗銘
Chung-Ming Young
口試委員: 陳良瑞
Liang-Rui Chen
王見銘
Chien-Ming Wang
林長華
Chang-Hua Lin
劉益華
Yi-Hua Liu
學位類別: 博士
Doctor
系所名稱: 電資學院 - 電機工程系
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: 112
中文關鍵詞: 轉換器多階脈波轉換器諧波主動式相間變壓器電流注入消除相移變壓器電流不平衡因素二十四脈波轉換器
外文關鍵詞: Converters, multi-pulse converter, Harmonics, active inter-phase transformers, current harmonic elimination, phase-shift transformer, current unbalance factor, 24-pulse converter
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本論文探討二十四脈波轉換器之諧波補償策略,在主動式注入電流24-脈波電源轉換器的諧波補償方法中,加上補償電流注入位置選擇策略,可應用於二十四脈波轉換器阻抗不平衡狀況下之諧波消除。
三相交流電源以相序相反方式,加於兩組延伸相移變壓器(Side-extend變壓器)及Y-Δ的轉換器,得到四組相位各差十五度的三相電源,供給四組六脈波二極體濾波器,在直流輸出側再以相間變壓器並聯,得到傳統的二十四脈波AC-DC電源轉換器。
本論文提出之注入位置補償策略,應用於由相間變壓器及變流器所構成主動式注入補償電流,讓補償電流由相間變壓器二次側交替注入,於電源端相移變壓器的電壓不平衡或直流輸出側阻抗不平衡,所產生相鄰電流不對稱時,提高交流輸入線電流總諧波失真的補償效果。
為降低交流電源側之總諧波失真,本論文提出以被動式補助電路方式,於相間變壓器二次側增加補助電路,構成緩衝(Snubber)電路之功能,產生補償注入電流,應用於十二脈波與二十四脈波AC-DC電源轉換器,可以有效的改善電源側之諧波,得到較佳的諧波消除補償效果,提供改善電源介面品質的有效方法,提高電源之品質。


The research of this dissertation is mainly on a harmonic compensation strategy for a 24-pulse converter. It is proposed to add current injection position control to the traditional active injection current harmonic compensation scheme to effectively improve the harmonics distortion.
The 3-phase AC power source is applied, with opposite phase order, to two groups of side-extend phase-shift transformer and the Y-Δ converter to obtain four 3-phase power source groups with 150 phase shift. It is connected with four 6-pulse diode rectifiers, in parallel with interphase transformer at DC output side, to constitute a traditional 24-pulse AC-DC power converter.
This dissertation proposes the current injection position control strategy, applies on the active injecting compensation current, which is formed by interphase transformer (IPT) and inverter, the compensation current is injected on the secondary winding of the IPT alternatively. The strategy overcomes the unequal-shared line currents of the two phase-shift transformers with respect to the adjacent sources and the unequal impedance situation at DC output side. It enhances the compensation effect and can improve the power quality of AC mains.
This dissertation proposes a passive auxiliary circuit added on the secondary side of the interphase transformer (PAC+IPT) configuration to improve the total harmonic distortion (THD) at ac mains. The compensation method is a simple structure with low power consumption and without extra DC power supply. The proposed scheme has the function of a Snubber circuit and results in compensation injection current. When applying the method to a conventional 12-pulse and 24-pulse diode rectifiers AC-DC power converters, it can effectively improve the harmonic distortion and give a better quality of harmonic cancellation compensation effect. It is an effective way to improve the quality of power utility interface at AC mains.

Table of Contents 摘要 --------------------------------------------------------------------------I Abstract------------------------------------------------------------------------II Acknowledgement-----------------------------------------------------------------III Table of Contents---------------------------------------------------------------IV List of figures-----------------------------------------------------------------VI List of tables------------------------------------------------------------------XII Chapter 1 Introduction-----------------------------------------------------------1 1.1 Background and Motivation-------------------------------------------------1 1.2 Objective of the thesis---------------------------------------------------2 1.3 Organization of the thesis------------------------------------------------3 Chapter 2 Introduction of the inter-phase transformer (IPT) and the side-extended Transformers-------------------------------------------------------------5 2.1 Introduction--------------------------------------------------------------5 2.2 The traditional IPTs -----------------------------------------------------5 2.3 The uncontrollable IPTs---------------------------------------------------6 2.4 The controllable IPTs-----------------------------------------------------9 2.5 The side-extended transformers-------------------------------------------11 2.6 The side-extended transformers applied on a 24-pulse converter---------------16 2.7 Summary------------------------------------------------------------------17 Chapter 3 A harmonic compensation strategy for a 24-pulse converter with unbalanced impedance of phase-shift transformer---------------------------------------------19 3.1 Introduction-------------------------------------------------------------19 3.2 System construction------------------------------------------------------20 3.3 The Calculation of the Harmonic Elimination Strategy---------------------23 3.4 The Injecting Control Arrangement of the Unequal- Impedance Configuration-29 3.5 Simulation and Experimental Results--------------------------------------31 3.6 Summary------------------------------------------------------------------38 Chapter 4 A passive auxiliary circuit with the inter-phase transformer applied in a 12-pulse converters to provide clean power utility interface---------------------40 4.1 Introduction-------------------------------------------------------------40 4.2 Circuit construction-----------------------------------------------------41 4.3 Principal of proposed PAC plus IPT compensation method-------------------43 4.4 Compensation strategy and operations ------------------------------------52 4.5 Simulation and experimental results--------------------------------------57 4.6 Summary------------------------------------------------------------------71 Chapter 5 An auxiliary circuitcompensation method applied in a 24-pulse converter system to improving the power quality--------------------------------------------72 5.1 Introduction-------------------------------------------------------------72 5.2 Circuit construction-----------------------------------------------------73 5.3 Principal of proposed compensation method--------------------------------75 5.4 Compensation strategy and operations-------------------------------------80 5.5 Simulation and experimental----------------------------------------------83 5.6 Summary------------------------------------------------------------------92 Chapter 6 Conclusion------------------------------------------------------------93 6.1 Conclusion---------------------------------------------------------------93 6.2 Recommend----------------------------------------------------------------94 References-----------------------------------------------------------------------95

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