臺灣博碩士論文加值系統

本論文提出一個應用於電壓源不平衡之十八脈波交流/直流二極體轉換器的直流側電流注入法，以改善不同電壓不平衡度情形下電源端的總電流諧波失真，並降低電流不平衡度。系統中以Delta/delta/double polygon移相變壓器提供三組相位移各為正二十度、零度與負二十度的三相電壓源至三組二極體轉換器，並以相間變壓器並聯，構成十八脈波交流/直流轉換器系統。本系統以數位訊號處理器(TMS320F2812)做為系統控制核心，用以回授系統參數、計算補償命令及控制三相變流器開關之觸發信號，產生補償電流，再將補償電流直接注入於相間變壓器前級的直流端，改善電源端的電流品質。此直流側電流注入法使用之三相變流器除了具有低容量之優點[2.409%Po(pu)]，並與原十八脈波轉換器系統並聯操作，故當變流器發生故障無法注入電流時，系統仍可以傳統十八脈波轉換器型式操作，適合加裝至固有十八脈波轉換器系統以使用至更低電流諧波要求與需降低電源電流不平衡度之場合。本論文建立一3kW系統，並透過模擬與實作結果驗證其可行性。

In this thesis, a dc side current injection method is proposed for an 18-pulse AC/DC diode converter system with unbalanced voltage source to improve current total harmonic distortion of the power source and reduce the current unbalanced factor. In the proposed scheme, the Delta/delta/double polygon phase-shifting transformer is deployed to offer three three-phase voltage sources with +20°, 0° and -20° phase-shift to the three diode rectifiers and their outputs are parallel to the inter-phase transformer for generating the 18-pulse ac/dc converter system. This thesis applied the digital signal processor (TMS320F2812) as the core of control for feedback the parameters in system, calculating the compensation commands, and generating the trigger signals for control three phase inverter to generate the compensation current, then the compensation currents are injected to the dc side in front of the inter-phase transformer directly to improve the quality of the power supply side current. The three-phase converter used in this DC current injection method in addition to the advantages of low capacity [2.409% Po (pu)], and parallel operation with the original 18-pulse converter system, so when the converter malfunctions and cannot be injected current, the system can still work as traditional eighteen-pulse converter. It is suitable for preexisting 18-pulse converter systems to operate on the occasions demanding lower harmonics or need to reduce current unbalance factor. A 3kW prototype is built for test. Both simulation and experimental results demonstrate the validity of the proposed scheme.

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 XI
圖表目錄 XII
符號表 XIII
第一章 緒論 1
1.1 背景和動機 1
1.2 系統描述與研究方法 2
1.3 內容大綱 4
第二章 電力諧波與利用相間變壓器的諧波消除 6
2.1 電力諧波概論 6
2.1.1 諧波的定義 6
2.1.2 諧波的分析與計算 7
2.2 利用相間變壓器的諧波消除法 9
2.2.1 相間變壓器 10
2.2.2 可控型相間變壓器 19
第三章 移相變壓器與直流側電流注入法 30
3.1 利用移相變壓器的諧波消除 30
3.2 利用波形變化的特定諧波消除法 33
3.3 十八脈波二極體轉換器系統之補償電流波形 34
3.3.1 理論補償波形 34
3.3.2 近似補償波形 41
3.4 本章總結 44
第四章 不平衡對電力系統的影響 45
4.1 三相不平衡 45
4.2 對稱分量法 45
4.3 不平衡的指標與計算 49
4.4 電壓不平衡的管制標準 51
4.5 電壓不平衡的影響 51
第五章 硬體與軟體程式規劃 54
5.1 系統硬體 54
5.1.1 移相變壓器 55
5.1.2 三相轉換器 62
5.1.3 三相控電流型逆變器控制與其額定容量 63
5.1.4 相關設備與周邊輔助電路 69
5.1.5 數位信號處理器(TMS320F2812) 71
5.2 軟體程式規劃 73
5.2.1 類比與數位信號轉換 73
5.2.2 系統程式設計與流程圖 74
第六章 模擬與實驗結果 78
6.1 系統的開發實現與驗證 78
6.2 模擬與實驗結果 83
6.2.1 三相平衡 83
6.2.2 三相不平衡 87
第七章 結論與未來研究方向 129
7.1 結論 129
7.2 未來研究方向 130
附錄A 131
附錄B 132
附錄C 133
參考文獻 153

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