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研究生： 葉辰威
Chen-wei Yeh
論文名稱： 直流側注入策略應用於改善十八脈波閘流體轉換器系統電源電流
A DC side injection strategy for improving AC line condition applied in an 18-pulse thyristor converter system
指導教授： 楊宗銘
Chung-ming Young
口試委員: 劉益華
Yi-hua Liu
莊子賢
Tzu-shian Chuang
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： 2011
畢業學年度： 99
語文別： 英文
論文頁數： 134
中文關鍵詞： 十八脈波轉換器 、諧波消除策略 、三相變流器 、閘流體整流器
外文關鍵詞： 18-pulse converter, harmonics elimination strategy, three-phase current-controlled inverter, thyristor rectifier
相關次數： 點閱：206  下載：7 
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    • 本論文將閘流體整流器應用於十八脈波轉換器系統，並提出一直流側注入補償策略，由十八脈波轉換器的直流側直接注入補償電流，以改善不同延遲角的情形下，電源端的總電流諧波失真。本論文以數位訊號處理器(TMS320F2812)做為系統控制核心，用以回授系統參數、計算補償命令及產生閘流體與三相變流器開關之觸發訊號。系統中以Delta/delta/double polygon相移變壓器提供三組相位各差二十度的三相電壓源給三組閘流體整流器，並將其輸出接至相間變壓器而產生十八脈波輸出直流電壓。一組三相變流器用以產生補償電流，其直接接至三組閘流體整流器的直流輸出端，進行電流注入補償動作。此直流側注入補償策略使用之三相變流器除了具有低容量之優點[2.409%Po(pu)]，並與原十八脈波轉換器系統並聯操作，故當變流器發生故障無法注入電流時，系統仍可以傳統十八脈波轉換器操作。本論文針對十八脈波二極體轉換器系統，提出了直流側注入補償策略。另針對於閘流體轉換器，則為因應閘流體元件的最低導通電流特性限制而提出修正之注入電流命令。對於兩種調整方式，也將以模擬說明優劣。此注入補償策略系統非常適合加裝至固有十八脈波轉換器系統以使用至更低電流諧波要求之場合，或是改以應用閘流體以控制輸出電壓之轉換器，此注入補償策略可因應不同的閘流體延遲角做到即時補償。本論文建立一3kW系統，並透過模擬與實作結果驗證其可行性。

    In this thesis, the thyristor rectifiers are applied to the 18-pulse converter system and a DC side injection strategy is proposed to directly inject the compensation currents at the DC side of the 18-pulse converter for improving the overall AC line condition with various delay angles. The digital signal processor (TMS320F2812) is applied as the core of control in this thesis for feeding back the parameters in system, calculating the compensation commands, and generating the triggering signals for thyristor rectifiers and three-phase inverter. In the proposed scheme, the delta/delta/double polygon phase-shifting transformer is deployed to offer three three-phase voltage sources with ±20° phase-shift to the three thyristor rectifiers and their outputs are connected to the inter-phase transformer for generating the 18-pulse DC output voltage. A three-phase current-controlled inverter directly injects compensation currents into these outputs for improving AC line condition. Besides the advantage of the low kVA rating [2.409%Po (pu)], the three-phase inverter used in the proposed DC side injection strategy connects to the 18-pulse converter system in parallel. Therefore, when the inverter malfunctions, the system can still work with the traditional 18-pulse converter. In this thesis, a DC side injection strategy is proposed for 18-pulse converter systems and modified with the constraints of the latching current and the holding current when applying thyristors. The two modified compensation strategies are compared in simulation. The proposed compensation strategy is highly proper for preexisting 18-pulse converter systems to operate on the occasions demanding lower harmonics or to apply thyristors for controlling output voltage. The compensation strategy can compensate with various delay angles. A 3kW prototype is built for test. Both simulation and experimental results demonstrate the validity of the proposed scheme.

    摘要 I Abstract III Acknowledgement V Table of Contents VI List of figures VIII List of tables XII Nomenclature XIII Chapter1 Introduction 1 1.1 Background and motives 1 1.2 Objective of the thesis 3 1.3 Organization of the thesis 5 Chapter2 Techniques for PF improvement in multi-pulse converters 7 2.1 Introduction 7 2.2 Filtering techniques 7 2.2.1 Passive filters 7 2.2.2 Active filters 10 2.2.3 Hybrid filters 12 2.3 Current injection at DC sides 14 2.3.1 DC ripple reinjection 15 2.3.2 Inter-phase transformers 22 2.3.2.1 The traditional inter-phase transformers 23 2.3.2.2 The active inter-phase transformers 27 2.4 DPF improvement 31 Chapter3 The compensation strategy of DC side injection method 34 3.1 Introduction 34 3.2 Harmonics elimination with phase-shifting transformers 35 3.2.1 Phase staggering in 24-pulse converters 35 3.2.2 Phase staggering in 18-pulse converter 37 3.3 Specific harmonics elimination by waveform changing 38 3.3.1 For traditional 18-pulse diode converter system 39 3.3.1.1 The theoretical waveform 40 3.3.1.2 The approximated waveform 45 3.3.2 For 18-pulse thyristor converter system 48 3.3.2.1 The cut-waveform modification 52 3.3.2.2 The shrunk-waveform modification 53 3.4 Summary 55 Chapter4 Hardware configuration and software programming 58 4.1 Introduction 58 4.2 Hardware configuration 59 4.2.1 The digital signal processor (TMS320F2812) 59 4.2.2 The phase-controlled rectifier 60 4.2.3 The phase-shifting transformer 61 4.2.3.1 Analysis of phase-shifting angle 62 4.2.3.2 Analysis of winding currents 64 4.2.3.3 The kVA rating of delta/delta/double polygon transformers 66 4.2.4 Three-phase current-controlled inverter 67 4.2.5 The related devices and peripheral circuits in the system 73 4.3 Software programming 76 4.3.1 Analog to digital conversion ratio 76 4.3.2 The I/O port pins and interrupt for triggering SCRs with delay angle α 77 4.3.3 The PWM signals and interrupt for triggering the three-phase current-controlled inverter 79 Chapter5 Simulation and experimental results 81 5.1 Introduction 81 5.2 Development and realization of the simulation system 81 5.3 The simulation and experimental results of the proposed scheme 87 Chapter6 Conclusion and future work 104 6.1 Conclusion 104 6.2 Future researches 105 References 107

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