本文以數位控制器為控制核心，研製三相三支路電感耦合換流器功能具有雙向功率轉換功能，並將直流轉換成交流亦可搭配信號硬體模擬器，完成功率硬體模擬器的系統整合。系統控制策略採用電壓及電流閉迴路控制，以及各支路電流閉迴路控制，達成各相各支路的電流平衡目的。調變方面採用三組三相交錯式電壓空間向量脈波寬度調變，作為PWM信號調變控制，使得本系統能夠操作在高頻率的基本波進行運轉，並減少電壓及電流的總諧波失真率，提升整體穩態響應。整體控制電路以德州儀器公司所生產的數位信號處理器DSP(TMS320F28075)作為電路控制核心，並透過C語言撰寫換流器電流及電壓閉迴路控制策略，大幅減少硬體電路。
本文已完成三相三支路電感耦合換流器的實體製作，並利用Matlab/Simulink應用軟體，模擬系統控制策略之可行性。在實際測試方面，輸入電壓275 V，輸出相電壓為110 V有效值，輸出頻率範圍60 Hz~240 Hz，輸出功率範圍1.5 kW~3 kW，總諧波失真率範圍1.4 %~1.5 %最高效率可達97.1 %，且三相系統的電流平衡指標 均低於2.5 %。從實測結果得知，三相回授電壓及電流皆可追隨電壓及電流命令及整體系統皆可穩定輸出到達額定值。

關鍵字：變流器、三相換流器、減極性耦合電感、電流平衡控制、交錯式PWM、電壓空間向量脈波寬度調變

This thesis, use the digital controller as the control core, to develop three-phase three-branch inductor couple converter function with dual-phase power converter, and convert DC to AC, it can also be used with a signal hardware simulator to complete the power hardware simulator system integration. The system control strategy adopts voltage and current closed-loop control, and each branch current closed-loop control, to achieve the purpose of current balance of each phase and each branch. The modulation method adopts three groups of three-phase interleaved voltage space vector pulse width modulation, as PWM signal modulation control, this enables the system to operate at high-frequency fundamental waves, and reduce the total harmonic distortion rate of voltage and current, improve overall steady-state response. The overall control is based on the digital signal processor DSP(TMS320F28075) by "Texas Instruments (TI)" corporation, and through the C language to write the inverter current and voltage closed-loop control strategy, reducing the hardware circuit.
This thesis has completed the three-phase three-branch inductor coupled converter, and uses Matlab/Simulink application software to simulate verify the feasibility of the system control strategy. In the actual operate, the input voltage is 275 V, the output phase voltage is 110, the output frequency range 60 Hz ~ 240 Hz, output power range is 1.5 kW~3 kW, total harmonic distortion rate range from 1.4 % ~ 1.5 %, maximum efficiency can reach 97.1 %, and the current balance index of the three-phase system is lower than 2.5%. From the actual measurement results, it is known that the three-phase feedback voltage and current can follow the voltage and current commands, and the overall system can stably output to reach the rated value.
Keywords: converter, three-phase converter, coupled inductor with reduced polarity, current balance control, interleaved PWM, voltage space vector pulse width modulation.

[1] B. Cougo, T. Meynard and G. Gateau, " Parallel three-phase inverters: optimal PWM method for flux reduction in intercell transformers " IEEE Transactions on Power Electronics, vol. 26, no. 8, pp. 2184-2191, 2011.
[2] J. Ewanchuk and J. Salmon, " Three-limb coupled inductor operation for paralleled multi-level three-phase voltage sourced inverters " IEEE Transactions on industrial Electronics, VOL. 60, NO.5,pp 1979-1988, 2013.
[3] Mitsuaki Hirakawa、Masao Nagano andYasuto Watanabe, " High power density interleaved DC/DC converter using a 3-phase integrated close-coupled inductor set aimed for electric vehicles " Proc. 2010 IEEE Energy Conversion Congress and Exposition, Atlanta, GA, USA, pp.2451-2457, 2010.
[4] M. Hirakawa, M. Nagano, Y. Watanabe, K. Andoh, S. Nakatomi and S. Hashino, " High Power Density DC/DC Converter using the close-coupled inductors ", Proc.2010 IEEE Energy Conversion Congress and Exposition, San Jose, CA ,USA , pp.1760-1767, 2009.
[5] M. Hirakawa, Y. Watanabe, M. Nagano, K, Andoh, S. Nakatomi, S. Hashino, and T. Shimizu "High power DC/DC converter using extreme close-coupled inductors aimed for electric vehicles " Proc. The 2010 International Power Electronics Conference - ECCE ASIA, Sapporo, Japan, pp2941-2948, 2010.
[6] Martin Pavlovsky、Giuseppe Guidiand、Atsuo Kawamura, Fellow, IEEE " Assessment of coupled and independent phase designs of interleaved multiphase buck/boost DC-DC converter for EV power train " Transactions on Power Electronics, Vol. 29, No. 6, pp2693-2704, 2014.

[7] Y. Tsuruta, A. Kawamura, " A novel soft switching scheme QRAS converter aimed for FCEV " Power Electronics Specialists Conference, pp. 779-785, 2005.
[8] Y. Jang and Milan M. Jovanovic, " Interleaved boost converter with intrinsic voltage-doubler characteristic for universal-line PFC front end " IEEE Transactions on Power Electronics, Vol. 22, No. 4, pp. 394-1401, 2007.
[9] Jieli Li , C.R. Sullivan , " Coupled inductor design optimization for fast-response low-voltage DC-DC converters " IEEE Applied Power Electronics Conference, vol. 2, pp. 817-823, Mar. 2002
[10] F. Ueda, K. Matsui, M. Asao, and K. Tsuboi, “Parallel-connections of pulsewidth modulated inverters using current sharing reactors,” IEEE Trans. Power Electron., vol. 10, no. 6, pp. 673–697, 1995.
[11] R. Hong-Je, K. Jong-Soo, R. Geun-Hie, K. Yong-Ju , W. Myung-Ho, and Chung-Yuen Won , " Unit power factor operation of parallel operated AC to DC PWM converter for high power traction application " Proc. IEEE Power Electron. Spec. Conf , pp. 631–636.
[12] X. Mao, A. K. Jain, and R. Ayyanar, " Hybrid interleaved space vector PWM for ripple reduction in modular converters " IEEE Trans. Power Electron., vol. 26, no. 7, pp. 1954–1967, 2011.
[13] E. Laboure , A. Cuniere , T. A. Meynard , F. Forest , and E. Sarraute , " A theoretical approach to intercell transformers, application to interleaved converters " IEEE Trans. Power Electron., vol. 23, no. 1, pp. 464–474, 2008.
[14] 黃仲欽，“電機機械理論講義” 。
[15] 陳漢庭，“電壓源換流器之三支路電感耦合轉換器設計”，國立臺灣科技大學電機工程系碩士論文，民國一百零八年。
[16] 黃兆庭，“具四支路電感耦合單相及三相換流器設計”，國立臺灣科技大學電機工程系碩士論文，民國一百零九年。
[17] 周偉翔，“感應馬達及機械負載功率模擬器研發”，國立臺灣科技大學電機工程系碩士論文，民國一百一十年。
[18] 許智鈞，“三相感應馬達及負載的功率模擬器研發”，國立臺灣科技大學電機工程學系碩士論文，民國一百一十年。
[19] 簡延諭，“向量控制變頻器之研製”， 逢甲大學電機系碩士論文，民國一百零六年。
[20] 胡峻瑋，“三相兩階層電壓源變頻器之新型預測電流控制器設計與研製”，國立海洋大學電機工程學系碩士論文，民國一百零五年。
[21] 林子揚，“考量輕載控制策略及可靠度成本之並聯換流器最佳設計”，國立中山大學電機工程學系碩士論文，民國一百零四年。
[22] 莫雨樺，“並聯換流器技術之研究”，逢甲大學電機系碩士論文，民國一百零二年。
[23] 高偉仁，“磁性元件整合為基礎的高效率高功率密度直流/直流轉換器之研究”，國立交通大學電機與控制工程學系碩士論文，民國九十三年。
[24] 陳致宇，“三相自激式感應發電機供應AC/DC/AC變流器支數值與解析”，國立雲林科技大學電機工程學系碩士論文，民國一百零五年。
[25] 陳昱仁，“單相全橋式換流器並聯運轉之控制策略設計”，國立臺灣科技大學電機工程系碩士論文，民國一百零八年。
[26] 方柏盛，“使用空間向量脈波寬度調變之三相多階中性點箝位變連器之研製”，國立高雄應用科技大學電機工程學系碩士論文，民國一百一十年。
[27] 陳允彥，“三相交錯式電感耦合設計”，國立台灣科技大學電子工程學系碩士論文，民國一百一十年
[28] 許凱程，”具三繞組耦合電感之三端雙向DC/DC 轉換器”，國立高雄科技大學電子工程學系碩士論文，民國一百零八年