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研究生:李月寶
研究生(外文):Yueh-Pao Lee
論文名稱:三相四開關整流器之定頻磁滯電流控制器
論文名稱(外文):Constant Frequency Hysteresis Current Controller for a Three-Phase Four-Switch Rectifier
指導教授:潘晴財
指導教授(外文):Ching-Tsai Pan
學位類別:碩士
校院名稱:國立清華大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:中文
論文頁數:96
中文關鍵詞:定頻磁滯整流器
外文關鍵詞:Constant frequencyHysteresisRectifier
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近年來由於高科技產業的迅速發展,使得用戶對於電力品質的要求也越來越嚴格,因此近十年來有許多文獻在探討如何讓交/直流轉換器降低諧波失真以達到高功率因素。其中磁滯電流控制器因為其具有動態響應快,實作電路簡單及限制電流誤差範圍等優點,故在早期已被廣泛的使用,但是其最大的缺點在於不固定的切換頻率,使得濾波器設計困難同時亦會增加開關切換損失,造成磁滯電流控制在應用上的限制。因此如何能進一步改善此缺點,使磁滯電流控制能達到定頻切換效果也是目前許多文獻上所探討的主題,本論文主要目的即為針對此缺失提出一新型控制策略以改善之。
本論文在一開始首先簡單介紹傳統磁滯電流控制器之工作原理,並研析其在不同的直流輸出電壓下,實際電流之可控性;此外經由數學模式之推導,而獲得其不等式條件;其次為簡化起見,本論文針對其中較保守之條件(即任何開關切換週期內均可直接獲得唯一之電壓空間向量以減少電流向量之誤差),利用電流誤差導數之觀念,並加上一固定誤差邊界來推導出各開關所需導通或截止時間之封閉式數學解析式,可以同時達到切換頻率固定與誤差邊界固定之良好結果;第三點,利用前述所推導之公式,吾人亦可考慮系統擾動或非理想開關之時延特性所產生的誤差,於每次計算各開關導通時間時一併加以校正,如此不僅可以避免造成誤差之累積,同時亦可免除修正誤差所需額外之運算量;本論文第四點貢獻則為利用所導出之數學理論結果,經由模擬與觀察,從而歸納出本論文之定頻磁滯電流控制策略,可以進一步減少一半之計算時間,並且使得電流誤差量更平均地分佈在其誤差邊界內,因此可不必額外增加開關切換頻率而獲得進一步改善其受控電流之波形品質。本論文最後並實際製作一實體電路以驗證所提理論之正確性與可行性。

Recently, due to the rapid progress in high technology industry, much better power quality is required to meet the need of highly accurate automation machinery. As a result, how to eliminate the harmonics to achieve high power quality in a rectifier has been discussed in many literatures. Owing to the fast response, easy implementation and with fixed bounded errors, the hysteresis current controller has been widely used in various applications. However, the variable switching frequency has rendered the increasing switching loss and the harder design of the filter. Hence, how to achieve fixed switching frequency control is one of the hot topics in the literature. In fact, it is the main object of this thesis to propose a novel control strategy of constant switching frequency hysteresis current controller.
First at all, the operation principle of the traditional hysteresis current controller and the corresponding controllable condition under different output DC voltages are introduced. The inequality constraint of the controllability is obtained through the derived model. Second, the closed form expression of switch turn-on time and the corresponding partition into proper sequence are obtained to achieve constant switching frequency and with fixed error bound at the same time. Third, by modifying the formula derived before, the error due to transient and nonideal switch characteristics can be corrected at the same time while calculating the turn-on time. By this way, one can not only avoid the accumulation of the error but also can reduce unnecessary computing time for additional error correction. Fourth, the control strategy is further refined to reduce half of the computing time and make the current error distribution more uniformly inside the error bound. Hence, one can achieve a better performance without increasing the switching frequency. Finally, a prototype is constructed and some experimental results are presented for verifying the feasibility of the proposed controller.

目錄
摘 要 I
目錄 IV
圖目錄 VI
表目錄 IX
第一章 1
緒 論 1
1.1研究動機 1
1.2文獻回顧 2
1.3本論文之貢獻 4
1.4本論文內容概述 5
第二章 傳統三相四開關整流器之
    磁滯電流控制策略 6
2-1 前言 6
2-2 傳統磁滯電流控制策略之基本原理 6
2-3 磁滯電流控制策略之可控制條件推導 22
2-4 模擬結果 27
第三章 新型定頻磁滯電流控制器 35
3-1 前言 35
3-2 新方法之理論基礎 35
3-3 新型定頻磁滯電流控制器之控制策略 60
3-4 模擬結果 67
第四章 實體電路製作與實測結果 73
4.1 前言 73
4.2 實體電路製作 74
4.2.1電力電路 74
4.2.2控制電路 75
4-3 實驗結果 82
第五章 87
結論 87
參考文獻 89
附錄A 三相定頻磁滯電流控制器之模擬方
    塊圖 94
附錄B 作者與口試委員合影留念…………..97

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