本文旨在消除二十四脈波轉換系統輸入線電流之諧波失真，系統前級以兩組相同的延伸繞組變壓器，輔以互為反相序之三相輸入電源，產生四組相位各差十五度的電源，作為六脈波轉換器的輸入端，並以相間變壓器並聯之，構成一組二十四脈波轉換器，藉由此二十四脈波轉換器可消除部分諧波，僅留下24n±1次的特性諧波。本論文於第一級相間變壓器上加入二次側繞組，使之成為主動式相間變壓器，並使用以數位信號處理器為控制核心之換流器，注入補償電流至主動式相間變壓器二次側，消除24n±1次諧波。本文提出一補償策略，在系統前級之延伸繞組變壓器於阻抗不平衡條件下，注入補償電流策略不僅可消除24n±1次諧波，亦可抑制因阻抗不平衡因素造成之諧波失真以及電流不平衡率。本文建立一6kW系統，並透過模擬與實作結果驗證其可行性。

The subject of this thesis is to eliminate harmonics of the overall input line current in a 24-pulse converter system. The proposed structure applies two identical side-extended transformers with three-phase input voltage source in reverse order, so that four sets of voltage source with 15 degrees phase-shift are generated, and then sent into 6-pulse converters. The 24-pulse converter system is composed of four 6-pulse converters which connected by inter-phase transformers. While the proposed system works as a 24-pulse converter, all harmonics are eliminated except the 24n±1th, the characteristic harmonic. The two first-stage IPTs add the secondary winding to be an active IPT, and the overall input line conditions is improved by injecting compensation current into the secondary winding with a current-controlled inverter. This thesis proposed a compensation strategy to reduce the 24n±1th harmonic, moreover, the strategy also overcomes the total harmonic distortions caused by unbalance impedance of side-extended transformers, and the unbalanced factor of input line currents can be improved, too. A 6 kW prototype is built for test. Both simulation and experimental results demonstrate the validity of the proposed scheme.

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