由於高效率的表現於中低壓的應用場合中，三階層T型逆變器受到許多關注於併網類型的應用，例如能量儲存系統。本文設計以三階層T型逆變器為電能轉換器的能量儲存系統，並以串聯的兩組電池作為直流端電源。透過提出的三階層調變策略，使系統可以在正常系統運作階段同時平衡電池充電狀態。此外，由於串聯的兩組電池可能有不同的充電狀態，所以必須在逆變器的三階層調變策略設計中考慮不同的電池電壓，使三階層逆變器可以在不平衡電容電壓的情形下，輸出平衡不失真且不包含低次諧波成份的電壓。最後透過實驗室等級的硬體電路平台，驗證所提出調變策略的可行性。

The three-level T-type inverter has received much interest in energy storage systems due to its high efficiency. The present thesis proposes a novel modulation for three-level T type inverter fed by two distinct battery banks in series connection as energy storages system. The proposed three-level modulation is able to control charge/discharge current of each battery banks to get SOC balancing. In addition, unbalanced condition of capacitors voltage should be considered in three-level modulation since the battery banks might be in different SOCs. Hereby, the inverter will be able to produce balanced output voltage without low order harmonics even under different voltage. Experimental results are provided to verify the proposed method.

論文審定書 i
致謝 ii
摘要 iii
Abstract iv
目錄 v
圖次 viii
表次 xii
第一章 緒論 1
1.1. 研究背景 1
1.2. 研究動機及目的 3
1.3. 論文大綱 4
第二章 文獻回顧 5
2.1. 逆變器併網之電流諧波規範 5
2.2. 三相交流系統瞬時功率 7
2.2.1. 三相系統參考座標 7
2.2.2. 瞬時功率理論 8
2.3. T型逆變器介紹 10
2.3.1. 三階層電壓源逆變器 10
2.3.2. T型逆變器動作說明 11
2.4. 以載波為基礎的開關訊號調變器 14
2.4.1. 開關訊號調變器類型 14
2.4.2. 載波調變之限制 17
2.4.3. 以載波為基礎的三階層調變機制說明 18
2.5. 考慮不平衡電容電壓情況的調變策略 20
2.6. 三階層逆變器之中性點電流控制以及應用 23
2.6.1. 零序電壓注入法 23
2.6.2. 中性點電流控制能力 25
2.7. 總結 27
第三章 調變策略與逆變器控制設計 28
3.1. 調變策略設計說明 29
3.1.1. 不平衡電壓影響修正 30
3.1.2. 逆變器中性點電流控制 35
3.1.3. 三階層調變器 43
3.2. 電池電流控制機制 44
3.3. 併網系統功率傳輸策略 47
3.3.1. 併網系統功率傳輸策略 47
3.3.2. 交流電流控制器及濾波電感設計 48
3.3.3. 濾波電感設計 49
3.4. 總結 49
第四章 實驗結果 50
4.1. 簡介 50
4.2. 逆變器開迴路輸出電壓控制實驗 52
4.2.1. Case 1:傳統調變於電容電壓平衡情況 54
4.2.2. Case 2:分別正規化調變於電容電壓平衡情況 56
4.2.3. Case 3:本文所提出之調變於電容電壓平衡情況 58
4.2.4. Case 4:傳統調變於電容電壓不平衡情況 60
4.2.5. Case 5:分別正規化調變於電容電壓不平衡情況 62
4.2.6. Case 6:本文所提出調變於電容電壓不平衡情況 64
4.2.7. 逆變器開迴路輸出電壓控制實驗總結 66
4.3. 併網之電流控制實驗 67
4.3.1. Case 1:直流電壓平衡情況 68
4.3.2. Case 2:直流電壓不平衡情況(VP>VN) 71
4.3.3. Case 3:直流電壓不平衡情況(VP<VN) 73
4.3.4. 併網實驗之總結 76
第五章 結論與未來研究方向 77
5.1. 結論 77
5.2. 未來研究方向 77
參考文獻 78
附錄 82
實驗機台實體照片 82
實驗波形之電力品質分析儀結果照片 84

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