三相T-type整流器於不平衡電網下主動輸出電壓不平衡控制及直流端電壓漣波抑制

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姓名

陳品儒(Ping-Ju Chen) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

三相T-type整流器於不平衡電網下主動輸出電壓不平衡控制及直流端電壓漣波抑制
(DC-Bus Voltage Ripple Suppression and Active Control of Output Voltage Imbalance in Three-Phase T-Type Rectifiers under Unbalanced Grid)

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摘要(中)

三相三階層AC/DC轉換器中T-type整流器具有高效率且較低的功率開關應力，本文控制T-type整流器的中性點電壓，使直流端電壓可作為兩組獨立型的輸出電壓源，並消除中性點電流擾動，實現高效能的電源供應。在實際應用中，需要考量不同電網條件下整流器的運行，本文在不平衡電網下，研究功率流在電網與整流器之間的轉換，並提出新型控制策略。所提方法為基於虛擬電容使消除整流器電感漣波功率所造成的整流器功率振盪，並建立匹配擴充功率理論的改良型電壓調變直接功率控制架構，以實現三相T-type整流器電流無失真和高功率因數，並能提供穩定且準確的直流輸出電壓，與過往文獻相比，所提策略無需鎖相迴路和系統交流端參數，因此有優異的動態性能和參數不匹配之穩健性。本文T-type整流器控制架構中應用啟動電流抑制方法，並重新設計緩啟動電阻，精準限制整流器啟動過程中出現的湧浪電流且降低硬體成本。本文所提控制策略最終透過模擬軟體進行結果分析，並實作建置一台2.4 kW三相T-type整流器驗證所提控制策略的有效性和正確性。

摘要(英)

In three-phase three-level AC/DC converters, the T-type rectifier stands out for its high ef-ficiency and lower power switching stress. This paper focuses on controlling the neutral point voltage of the T-type rectifier, enabling the DC side voltage to serve as two independent output voltage sources, and eliminating neutral point current disturbances to achieve high-performance power supply. Practical applications necessitate the consideration of the rectifier′s operation un-der various grid conditions. This study examines the power flow between the grid and the recti-fier in unbalanced grid conditions and proposes a novel control strategy. The proposed method is based on virtual capacitance to eliminate the power oscillation caused by the rectifier inductor ripple power and establishes an improved voltage modulation direct power control framework that matches the extended power theory. This enables the three-phase T-type rectifier to achieve distortion-free current and high power factor, while providing a stable and accurate DC output voltage. Compared to previous literature, the proposed strategy does not require a phase-locked loop or AC-side system parameters, thus exhibiting excellent dynamic performance and robust-ness against parameter mismatches. The control framework of the T-type rectifier includes a startup current suppression method and a redesigned soft start resistor to precisely limit inrush current during the rectifier′s startup process. The proposed control strategy is analyzed through simulation and verified by implementing a 2.4 kW three-phase T-type rectifier, demonstrating its effectiveness and validity.

關鍵字(中)

★ T-type整流器
★ 中性點電壓控制
★ 三相不平衡電網
★ 輸出電壓不平衡
★ 直流端電壓漣波抑制
★ 直接功率控制

關鍵字(英)

★ T-type rectifier
★ neutral point voltage control
★ three-phase unbalanced grid
★ output voltage imbalance
★ DC side voltage ripple suppression
★ direct power control

論文目次

摘要 i
Abstract ii
致謝 iv
目錄 v
圖目錄 viii
表目錄 xxvii
第一章緒論 1
1-1 研究背景與動機 1
1-2 文獻回顧 2
1-3 本論文之貢獻 5
1-4 論文架構概述 7
第二章三相T-type整流器電路及控制架構 9
2-1 前言 9
2-2 三相T-type整流器架構及工作原理 10
2-2-1三相T-type工作原理 10
2-2-2三相T-type整流器開關訊號載波脈波寬度調變 14
2-3 三相整流器電壓導向直接功率控制[4] 15
2-3-1三相T-type整流器建模 15
2-3-2三相T-type整流器電壓調節直接功率控制器設計 17
2-4 中性點(Neutral Point)電壓控制[14] 20
2-4-1平均中性點電流(inp)於中性點電壓擾動情形分析 20
2-4-2中性點電壓擾動優化成分注入法 22
2-5 三相T-type整流器限制湧浪電流緩啟動 30

第三章三相不平衡電網下整流器控制策略 34
3-1 前言 34
3-2 不平衡電網下基於直接功率控制之升壓電感功率補償[21] 35
3-2-1 三相整流器擴充瞬時功率理論模型 35
3-2-2 不平衡電網下電感瞬時功率 37
3-2-3 不平衡電網下輸出功率漣波消除 40
3-3 不平衡電網下基於電壓導向控制之虛擬電容電流前饋[20] 42
3-3-1 不平衡電網下的直流端電壓漣波原因和整流器功率模型 42
3-3-2 無需功率模型之直流端輸出電壓漣波抑制方法 43
第四章所提三相不平衡電網下新型虛擬電容功率前饋於T-type整流器控制策略 49
4-1 前言 49
4-2 所提新型虛擬電容功率前饋補償法 50
4-2-1 直流端輸出電壓二次漣波成因 50
4-2-2 虛擬電容功率模型 52
4-3 三相不平衡電網下改良型電壓調節直接功率控制 56
4-3-1 三相不平衡電網下T-type整流器建模 56
4-3-2 三相不平衡電網下T-type整流器改良型直接功率控制器設計 58
第五章模擬結果 64
5-1 前言 64
5-2 模擬電路與元件參數 65
5-3 三相不平衡電網下直接功率控制模擬結果 70
5-3-1 傳統瞬時功率理論下直接功率控制架構 70
5-3-2 擴充瞬時功率理論[22]下改良型直接功率控制架構 73
5-4 三相不平衡電網電壓下輸出電壓二次漣波抑制方法模擬結果 75
5-4-1 傳統不平衡電網下基於電壓導向控制之虛擬電容電流前饋法[20] 75
5-4-2 傳統不平衡電網下基於直接功率控制之升壓電感功率補償法[21] 80
5-4-3 所提不平衡電網下基於直接功率控制之新型虛擬電容功率前饋策略 84
5-4-4 不平衡電網下輸出電壓二次漣波抑制方法比較模擬結果 88
5-5 所提不平衡電網下新型T-type整流器控制策略主動輸出不平衡模擬結果 98
第六章實作電路結果 104
6-1 硬體電路設倍與微控制器介紹 104
6-2 三相不平衡電網電壓下輸出電壓二次漣波抑制方法實作結果 111
6-3 不平衡電網下輸出電壓二次漣波抑制方法比較實作結果 112
6-4 所提不平衡電網下新型T-type整流器控制策略主動輸出不平衡實作結果 120
第七章結論與未來展望 124
7-1 論文內容總結 124
7-2未來展望 125
參考文獻 126

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指導教授

廖益弘(Yi-Hung Liao)

審核日期

2024-8-9

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