臺灣博碩士論文加值系統

隨著電力電子技術的進步與世界各國對於電力品質要求愈趨嚴格，單相功因校正器在產品應用已相當廣泛。而三相大功率之應用常利用閘流體之導通相角來控制輸出功率，以致於電流諧波量相當大，往往造成輸配線、變壓器、發電機組發熱，甚至影響電力系統之穩定。可預期的，三相功因校正器在三相系統之應用亦將愈來愈普遍。然而由於三相系統功率較大，相對的功率開關元件導通與截止時產生的切換雜訊與功率元件遭受之電氣應力及損失亦較大。因此本論文主要目的即在針對目前最普遍採用之三相昇壓型主動功因修正器，提出一新型柔性切換脈寬調變(PWM)策略。
基本上本論文的主要貢獻可分為下列數點。首先，本論文提出一不連續脈寬調變策略使得該主動功因校正器在任何時刻，均只需調控二個主動開關元件以調控三相線電流，俾獲得近似弦波波形與近乎單位功因。如此可以大大地減少主動開關元件之切換次數與切換損失。其次，並採用文獻上應用於單相之柔性切換電路，將其擴展到本論文之三相昇壓型主動功因校正器。文中並詳細分析有關新系統之柔性切換工作原理。第三，經由前述結果分析歸納出一簡單的責任週期方程式，可以很方便地配合前述不連續脈寬調變策略，同時兼可省略掉使用三相輸入電流感測器，簡化系統硬體電路。最後，並搭配使用數位信號處理器完成硬體雛型，以驗證新型柔性切換策略之效果。

In parallel with the progress of power electronics technology and the more strict requirement of power quality, single-phase power factor correctors have been widely used in various products. Hence, one can expect that application of three-phase systems will become more and more popular as well. However, due to the higher power rating, the resulting switching noise, loss and electrical stress of the power devices resulting from turning on and off of the active devices will also become much larger. Therefore, it is the main purpose of this thesis to propose a novel soft switching pulse-width-modulation(PWM) strategy for a popularly used three-phase boost power factor corrector(PFC).
Basically, major contributions of this thesis may be summarized as follows. First, a discontinuous PWM(DPWM) strategy is proposed for the adopted three phase boost PFC such that for any time only two active switches are switched ON/OFF to control the three-phase line currents to track the ideal sinusoidal currents and achieve unity power factor. As a result, the switching number and the switching loss of the PFC can be greatly reduced. Second, an existing single-phase soft switching subcircuit is applied to the three-phase boost PFC of this thesis to extend its application. Detailed soft switching mechanism in the three-phase case is analyzed in the context. Third, from previous analyses, a very simple duty ratio control formula is proposed for matching the proposed soft switching DPWM strategy. It turns out that with this analytical duty ratio law, current sensors of the AC side line currents can be omitted and the hardware system can be simplified. Finally, a hardware prototype system is constructed by using a DSP, namely TMS320F240, to verify the effectiveness of the novel soft switching strategy.

中文摘要 I
英文摘要 II
目錄 III
圖目錄 V
表目錄 X
第一章 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論文架構 4
第二章 三相主動功因修正器之基本架構及工作原理 6
2.1前言 6
2.2三相主動功因修正器之基本架構及工作原理 7
2.3基本柔性切換三相主動功因修正器
之結構與原理簡介 12
第三章 新型柔性切換三相昇壓型主動功因修正器 30
3.1前言 30
3.2所採用三相主動功因修正器之PWM策略 30
3.3新型柔性切換電路之架構與操作模式分析 38
3.3.1 P0組態轉換至P1組態過程 38
3.3.2 P1組態轉換至P2組態過程 52
3.3.3 P2組態轉換至P0組態過程 58
3.4模擬結果 61
第四章 實體製作與實測結果 71
4.1前言 71
4.2硬體電路與實現 71
4.3實測結果與討論 79
第五章 結論 89
參考文獻 91
附錄一 可程式邏輯規劃程式 100

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