針對串聯式電壓驟降補償器之變壓器湧浪電流抑制方法

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研究生：	陳維庭 Wei-Ting Chen
論文名稱：	針對串聯式電壓驟降補償器之變壓器湧浪電流抑制方法 A transformer inrush mitigation method for series voltage sag compensators
指導教授：	鄭博泰 Po-Tai Cheng
口試委員:
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：	2005
畢業學年度：	93
語文別：	英文
論文頁數：	90
中文關鍵詞：	電壓驟降補償器、變壓器湧浪電流
外文關鍵詞：	voltage sag compensator, transformer inrush current
相關次數：	點閱：2 下載：0
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電壓驟降在工業界是一項非常重要的電力品質問題。特別是對於一些在工業園區的高科技產業公司，在配電系統中任何的電壓驟降事件都會影響很多的製造廠並造成許多嚴重的損失。很多不同的解決方法都不斷因應而生，而其中以反流器利用耦合變壓器串聯線路的串聯式電壓驟降補償器是在所有解決方案中最符合經濟效益的。
由於驟降補償器是離線式的，在開始補償所可能產生的變壓器飽和是一項重要的議題。在變壓器飽和時的湧浪電流可能會使反流器的過電流保護動作，而且變壓器二次測輸出電壓也會因電磁飽和而被大量的減低，對於電壓驟降補償器來說，是十分不利的。普遍都會加大變壓器額定來避免湧浪電流的發生，然而這樣卻會增加整個補償器的體積以及重量。本論文提出一種新的湧浪電流抑制方法，除了對耦合變壓器做湧浪電流抑制外並且可以保持有效的電壓驟降補償，以達成更好的電壓驟降補償功能。
本文將以電腦模擬及實際電路實驗結果，驗證所提之對於串聯式電壓驟降補償器系統的湧浪電流抑制方法，論文內容為緒論、文獻回顧、湧浪電流抑制原理、模擬結果與分析、實驗結果與分析以及結論等六個章節，詳細說明串聯式電壓驟降補償器之控制原理及所提出對於串聯式電壓驟降補償器之湧浪電流抑制方法。

Voltage sags are major power quality problems encountered by industries. Especially for high-tech companies which reside within inside industry park, any voltage sag event in the power distribution system could affect many manufacturers and inflict significant losses. The voltage sag compensator, based on transformer-coupled series-connected voltage source inverter, is among the most cost-effective solution to protect sensitive loads.
For the off-line sag compensator, one important issue is the transformer inrush at the start of sag compensation. The inrush current may trigger the over-current protection of the compensator inverter, and the transformer output voltage is greatly reduced due the magnetics saturation. Oversizing the transformer is a common approach to avoid the inrush current. However, this would dramatically increase the size and weight of the sag compensation system. This paper proposes a new technique for mitigating the inrush of the coupling transformer and preserving the output voltage for effective sag compensation. Detailed explanations of the proposed inrush mitigation technique are presented, and the effectiveness of the proposed scheme is verified by laboratory test results.

Abstract.................................................III
List of Contents.........................................IV
List of Figure...........................................VII
List of Table............................................XI
Chapter 1.  Introduction.................................1
       1.1 Introduction..................................1
       1.2 Series sag compensator........................1
       1.3 Transformer saturation (inrush) phenomenon....2
       1.4 Summary.......................................3
       1.5 Organization of the thesis....................4
Chapter 2.  Literature Review............................5
       2.1 Introduction..................................5
       2.2 Inrush current................................5
       2.3 Inrush phenomenon in series sag compensation..7
       2.4 Various inrush mitigation methods.............8
         2.4.1 Point-on-voltage wave switching controlled
               technique.................................8
         2.4.2 Soft-start method.........................10
         2.4.3 Reactor starting method...................11
         2.4.4 Constant form factor......................11
         2.4.5 Adaptive form factor......................12
       2.5 Summary.......................................13
Chapter 3.  Principles of Operation......................14
       3.1 Introduction..................................14
       3.2 Series sag compensator controller.............16
         3.2.1 Voltage sag detection.....................16
         3.2.2 Computation of compensation voltage.......18
       3.3 Inrush mitigation.............................19
       3.4 Voltage adjustments for avoiding further
           saturation....................................20
         3.4.1 The DC thrust scheme......................21
         3.4.2 The AC thrust scheme......................22
       3.5 Summary.......................................24
Chapter 4.  Simulation Results...........................25
       4.1 Introduction..................................25
       4.2 Simulation of inrush current mitigation.......27
       4.3 Simulation of voltage sag compensation........30
         4.3.1 Linear load (Rs=5mH)......................31
         4.3.2 Linear load (Rs=12mH).....................33
       4.4 Summary.......................................36
Chapter 5.  Laboratory Test Results......................38
       5.1 Introduction..................................38
       5.2 Transformer identification....................40
       5.3 No load test circuit..........................43
       5.4 Sag compensation results (linear load)........47
       5.5 Sag compensation results (nonlinear load).....52
       5.6 Summary.......................................55
Chapter 6.  Conclusion...................................57
Reference................................................63
Appendix A. Hardware Implementation......................66
       A.1 Three-phase voltage detection circuit.........66
       A.2 Three-phase current detection circuit.........67
       A.3 Thyristor gate driver circuit.................68
       A.4 IGBT gate driver..............................69
       A.5 DC bus circuit................................70
       A.6 Pictures......................................71

                                

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