應用D-Q軸轉換控制策略於三相交流/直流轉換器

Application of D-Q Axis Transformation Control Strategy for Three-phase AC/DC Converter

陳柏憲(Bo-Xin Chen)

指導教授 ： 邱國珍

國立虎尾科技大學/電機資訊學院/電機工程研究所/碩士(2012年)

摘要

本論文應用新型控制策略於三相交流/直流轉換器，該轉換器採用三相全橋式架構具有弦波輸入電流、單位功因與能量回送之優點。在控制迴路中使用D-Q軸轉換技巧，將三相交流訊號轉換為兩個直流訊號，可獲得較快速之動態響應。使用狀態空間平均法推導出開關責任週期之通解並進一步推導死帶控制調變，加入此調變技術可減少1/3比率開關切換損失、進而提高轉換器效率與電壓使用率。並採用TI開發之DSP TMS320F28335搭配VisSim軟體實現系統之數位化控制，使轉換器電路體積縮小與參數修改方便之優點。最後，提出實驗結果來驗證所提控制策略之可行性。

關鍵字

三相交流/直流轉換器 ； 單位功因 ； 能量回送 ； D-Q軸轉換 ； 死帶控制 ； 數位訊號處理器

並列摘要

In this thesis, a new control strategy for three-phase AC/DC converter has proposed. Basically the proposed converter adopts three-phase full-bridge circuit and has several advantages such as sinusoidal input current, unity power factor and energy regeneration. For the control loop requirement, three phase AC signals are transformed to DC d-q signals by using the D-Q axis transformation such that the converter has faster dynamic response. The general solution of switching duty ratio is obtained by using the state space averaging technique. Based on the solution, a dead-band control modulation is implemented to drive the proposed converter. The effectiveness of the control can reduce 1/3 times switching number and switching losses successfully. Consequently, the efficiency and voltage utilization of the converter can increase. Both TI DSP TMS320F28335 and VisSim software are employed to achieve digital control successfully. The advantages of the converter include size-reduced and easily adjusting for control parameters. Finally, some experimental results are presented to verify feasibility of the proposed control strategy.

並列關鍵字

three-phase AC/DC converter ； unity power factor ； energy regeneration ； D-Q axis transformation ； dead-band control ； digital signal processor

參考文獻

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