具柔切三相分源逆變器與直交流電壓控制策略研製

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姓名

劉信良(Xin-Liang Liu) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

具柔切三相分源逆變器與直交流電壓控制策略研製
(A ZVS Three-phase Split-Source Inverter and DC-AC Voltage Control Strategy)

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★ 應用於具儲能混合交直流微電網之雙向互連轉換器電壓控制策略	★ 考慮不平衡電源之三相整流器線性化直接功率控制之研製

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摘要(中)

本論文著重於研發三相分源逆變器的電路優化，加入直交流側電壓控制、減少開關切換狀態策略與柔性切換等功能。使用傳統雙迴路控制應用於此電路會導致直流側電壓和交流側電壓耦合之問題，本論文提出新型直交流側電壓控制，可以使直流側電壓和交流側電壓分開控制，不再相互受到影響，並且可使直流側應用更加靈活。而此電路因為升壓電感充放電需平衡的關係，無法使用傳統不連續脈波寬度調變(DPWM)，必須使用修改型空間向量調變(Modified SVPWM)做控制，增加其電感充放電之穩定度。所以本論文提出一種減少開關切換狀態策略，觀察開關無用狀態，減少其開關切換次數，彌補無法使用不連續脈波寬度調變所造成的切換損失。此外本論文使用後緣鋸齒載波，可減少輸入端二極體之換向次數，減少換向損耗。最後因為此電路雙埠輸出關係，開關電流應力遠大於傳統三相六開關電路，加入柔性切換功能，使其開關切換損耗降低，以提升整體電路之效能，使其轉換效率提升。

摘要(英)

This paper focuses on the circuit optimization of a three-phase split-source inverter, incorporating features such as DC-AC side voltage control, reduced switching state strategies, and soft switching. Using conventional dual-loop control for this circuit would lead to the problem of coupling between the DC-side voltage and AC-side voltage. This paper proposes a novel DC-AC side voltage control, which allows separate control of the DC-side voltage and AC-side voltage, eliminating their mutual influence and making the DC-side application more flexible. Due to the need for balancing the charging and discharging of the boosting inductor in this circuit, traditional discontinuous pulse-width modulation (DPWM) cannot be used. Instead, a modified space vector pulse-width modulation (Modified SVPWM) is employed to enhance the stability of inductor charging and discharging. Therefore, this paper presents a strategy to reduce switching states, identifying unused switching states and reducing the number of switch transitions to compensate for the switching losses incurred by the inability to use DPWM. Furthermore, this paper employs trailing-edge sawtooth carrier waveforms to reduce the number of diode commutations at the input side, thereby minimizing commutation losses. Finally, due to the dual-port output nature of this circuit, the stress on switch currents is much higher compared to traditional three-phase six-switch circuits. The addition of soft switching functionality reduces switch transition losses, enhancing the overall circuit efficiency and improving conversion efficiency.

關鍵字(中)

★ 分源逆變器
★ 直交流電壓控制策略
★ 減少開關切換
★ 零電壓切換

關鍵字(英)

★ Split-Source Inverter
★ DC and AC voltage control strategy
★ reducing switching
★ zero voltage switching

論文目次

摘要.................I
Abstract.............II
誌謝.................III
目錄.................IV
圖目錄...............VI
表目錄...............XVII
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......4
1-4論文內容概述......5
第二章三相分源逆變器介紹...6
2-1前言...................6
2-2交流側雙迴路控制........10
2-3直流側控制介紹..........13
2-4減少開關切換狀態原理....18
2-5柔切策略介紹............23
第三章所提直交流側電壓控制策略....30
3-1前言.....30
3-2所提直交流側電壓控制器...31
3-2-1孤島運作控制........31
3-2-2併網運作控制........34
3-3 減少開關狀態策略........38
第四章所提之柔性切換電路架構與切換策略.....44
4-1 所提柔性切換策略與電路動作原理分析......44
4-2元件設計分析...........52
第五章系統架構與模擬分析..60
5-1模擬軟體介紹...........60
5-2直交流側電壓控制模擬....62
5-3柔切模擬...............76
5-4減少開關切換狀態模擬....88
5-5損耗分析...............96
第六章硬體電路與實作結果..102
6-1 硬體與微控制器介紹...102
6-1-1硬體設備與電路.....102
6-1-2微控制器介紹.......109
6-2直交流側電壓控制實作....113
6-3柔切實作.............127
6-4減少開關切換狀態實作....136
第七章結論與未來展望......145
7-1 論文內容總結..........145
7-2 未來展望..............146
參考文獻..................147

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指導教授

廖益弘(Yi-Hung Liao)

審核日期

2023-10-4

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