本論文主旨在設計一個三階層交錯型升壓式直流/直流轉換器，系統透過四個相位相差π/2之開關訊號，驅動開關交錯切換，經交錯後，此架構比傳統升壓式直流/直流轉換器、三階層升壓式直流/直流轉換器有效的降低輸入電流與電感電流漣波，因此，本架構更適合使用在太陽能發電系統或是輸出負載變動量要求較小的輸入電源。
除了控制總輸出電壓，本研究使用增減開關責任週期方式對抗三階層架構產生的中性點不平衡情形；並依據此架構電路操作模式分析結果，進一步推導電路的小訊號模型、以及轉移函數。
系統使用德州儀器產生的數位訊號處理器(TMS320F28069)作為數位控制核心，且藉由模擬結果與分析來評估轉換器的特性；本研究建立一個輸入電壓為 310 V 至 530 V，輸出電壓控制在 750 V 的 2kW系統，透過模擬與實驗結果證明轉換器的可行性與穩定性。

The purpose of this thesis is to design a three-level interleaved DC/DC boost converter. System drives switch interleaved by four switching signals which phase is differ by π/2 for each. Through the interleaving, this topology can lower the input current and inductor current ripple more efficiently than the topology of the traditional DC/DC boost converter and the three-level DC/DC boost converter. Therefore, this topology is more suitable for solar power system or power source which required small load variation.
Except for controlling total output voltage, this study uses increasing and decreasing switch duty cycle to against the potential imbalance which is generated from three-level topology. Moreover, using the analysis result of this topology to get the small-signal modeling and transfer function.
The system adopts the digital signal processor TMS320F28069 as the digital controller, which is manufactured by TEXAS INSTRUMENTS. For evaluating the performance of the proposed converter, simulation results are obtained and analyzed. Moreover, this study establishes a 2kW test bench in which the input voltage varies from 310 V to 530 V and output voltage is regulated at 750 V. Both simulation and experimental results demonstrate the feasibility and stability of the proposed converter.

[1] J. R. Pinheiro, D. L. R. Vidor and H. A. Grundling, "Dual output three-level boost power factor correction converter with unbalanced loads," Power Electronics Specialists Conference, 1996. PESC '96Record, 27th Annual IEEE, Baveno, 1996, pp. 733-739 vol.1.
[2] V. Yaramasu and B. Wu, "Three-level boost converter based medium voltage megawatt PMSG wind energy conversion systems," 2011 IEEE Energy Conversion Congress and Exposition, Phoenix, AZ, 2011, pp. 561-567.
[3] H. C. Chen and J. Y. Liao, "Modified interleaved current sensor less control for three-level boost PFC converter with asymmetric loads," 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA), Hiroshima, 2014, pp. 2580-2586.
[4] H. C. Chen and J. Y. Liao, "Modified Interleaved Current Sensor less Control for Three-Level Boost PFC Converter With Considering Voltage Imbalance and Zero-Crossing Current Distortion," IEEE Transactions on Industrial Electronics, vol. 62, no. 11, pp. 6896-6904, Nov. 2015.
[5] M. H. Todorovic, L. Palma and P. Enjeti, "Design of a wide input range DC-DC converter with a robust power control scheme suitable for fuel cell power conversion," Applied Power Electronics Conference and Exposition, 2004. APEC '04. Nineteenth Annual IEEE, 2004, pp. 374-379 Vol.1.
[6] P. Thounthong, "Control of a Three-Level Boost Converter Based on a Differential Flatness Approach for Fuel Cell Vehicle 79 Applications," IEEE Transactions on Vehicular Technology, vol. 61, no. 3, pp. 1467-1472, March 2012.
[7] M. D. Bougrine, A. Benalia and M. H. Benbouzid, "Simple sliding mode applied to the three-level boost converter for fuel cell applications," Control, Engineering & Information Technology (CEIT), 2015 3rd International Conference on, Tlemcen, 2015, pp. 1-6.
[8] Y. Zhang, J. T. Sun and Y. F. Wang, "Hybrid Boost Three-Level DC–DC Converter With High Voltage Gain for Photovoltaic Generation Systems," in IEEE Transactions on Power Electronics, vol. 28, no. 8, pp. 3659-3664, Aug. 2013.
[9] E. Ribeiro, A. J. M. Cardoso and C. Boccaletti, "Fault-Tolerant Strategy for a Photovoltaic DC--DC Converter," in IEEE Transactions on Power Electronics, vol. 28, no. 6, pp. 3008-3018, June 2013.
[10] V. Herzog, T. E. Lipman, J. L. Edwards, and D. M. Kammen, “Renewable energy: A vaiable choice,” Environment, vol. 43, no. 10, pp. 8-20, 2001.
[11] 張建偉，「太陽能電池最大功率點追蹤之研究」，碩士學位論文， 國立成功大學，民國九十八年一月。
[12] J. M. Guerrero, F. Blaabjerg, T. Zhelev, K. Hemmes, E. Monmasson, S. Jemei, M. P. Comech, R. Granadino, and J .I. Frau, “Distributed generation: toward a new energy paradigm,” IEEE Industrial Electronics Magazine, vol. 4, no. 1, pp. 52-64, Mar. 2010.
[13] N. D. Benavides and P. L. Chapman, "Modeling the Effect of Voltage Ripple on the Power Output of Photovoltaic Modules," in IEEE Transactions on Industrial Electronics, vol. 55, no. 7, pp. 2638-2643, 80 July 2008.
[14] C. R. Sullivan, J. J. Awerbuch and A. M. Latham, "Decrease in Photovoltaic Power Output from Ripple: Simple General Calculation and the Effect of Partial Shading," IEEE Transactions on Power Electronics, vol. 28, no. 2, pp. 740-747, Feb. 2013.
[15] S.Ćuk, "A new zero-ripple switching dc-to-dc converter and integrated magnetics," Power Electronics Specialists Conference, 1980. PESC. IEEE, Atlanta, Georgia, USA, 1980, pp. 12-32.
[16] G. Zhu, B. McDonald and K. Wang, "Modeling and Analysis of Coupled Inductors in Power Converters," Applied Power Electronics Conference and Exposition, 2009. APEC 2009. Twenty-Fourth Annual IEEE, Washington, DC, 2009, pp. 83-89.
[17] H. Hu, S. Harb, N. H. Kutkut, Z. J. Shen and I. Batarseh, "A Single- Stage Microinverter without Using Eletrolytic Capacitors," IEEE Transactions on Power Electronics, vol. 28, no. 6, pp. 2677-2687, June 2013.
[18] 葉維珊，「兩級式三階層轉換器太陽能發電系統」，碩士學位論文，國立台灣科技大學，民國一零二年七月。
[19] 陳志瑋，「兩級式三階層轉換器結合被動式漣波消除電路應用於太陽能發電系統」，碩士學位論文，國立台灣科技大學，民國一零三年七月。
[20] Mohan, Undeland, and Robbins, Power Electronics, 3rd edition, John Wiley and Sons, NY, 2003.
[21] M. T. Zhang, Yimin Jiang, F. C. Lee and M. M. Jovanovic, "Single-81 phase three-level boost power factor correction converter," Applied Power Electronics Conference and Exposition, 1995. APEC '95.Conference Proceedings 1995. Tenth Annual, Dallas, TX, 1995, pp.434-439 vol.1.
[22] V. Yaramasu and B. Wu, "Three-level boost converter based medium voltage megawatt PMSG wind energy conversion systems," 2011
IEEE Energy Conversion Congress and Exposition, Phoenix, AZ,2011, pp.561-567.
[23] D. E. Soman et al., "Discontinuous conduction mode of a three-level boost DC-DC converter and its merits and limits for voltage cross
regulation applications," IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, Dallas, TX, 2014, pp. 4268-4272.
[24] Gang Yao, Lei Hu, Ying Liu, Alian Chen and Xiangning He, "Interleaved three-level boost converter with zero diode reverse-
recovery loss," Applied Power Electronics Conference and Exposition, 2004. APEC '04. Nineteenth Annual IEEE, 2004, pp. 1090-1095 vol.2.
[25] Z. Hao, Z. Jing-hua, H. Bing and T. Chao-nan, "A new interleaved three-level Boost converter and neutral-point potential balancing ," Instrumentation and Measurement, Sensor Network and automation (IMSNA), 2013 2nd International Symposium on, Toronto,ON,2013,pp. 1093-1096.
[26] B. Bryant and M. K. Kazimierczuk, "Small-signal duty cycle to inductor current transfer function for boost PWM DC-DC converter in continuous conduction mode," Circuits and Systems, 2004.ISCAS'04.Proceedings of the 2004 International Symposium on, 2004,82pp. V-856-V-859 Vol.5.
[27] Hao Ma, Cai Yang and Yao Zhang, "Analysis and design for single-phase three-level boost PFC converter with quasi-static model," IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society,Melbourne, VIC, 2011, pp. 4385-4390.
[28] J. M. Kwon, B. H. Kwon and K. H. Nam, "Three-Phase Photovoltaic System With Three-Level Boosting MPPT Control," IEEE Transactions on Power Electronics, vol. 23, no. 5, pp. 2319-2327, Sept. 2008.
[29] H. C. Chen and W. J. Lin, "MPPT and Voltage Balancing Control With Sensing Only Inductor Current for Photovoltaic-Fed, Three-Level,Boost-Type Converters," in IEEE Transactions on Power Electronics,vol. 29, no. 1, pp. 29-35, Jan. 2014.
[30] C. Xia, X. Gu, T. Shi and Y. Yan, "Neutral-Point Potential Balancing of Three-Level Inverters in Direct-Driven Wind Energy Conversion System," in IEEE Transactions on Energy Conversion, vol. 26, no. 1, pp.18-29, March 2011.
[31] R. Krishna, D. E. Soman, S. K. Kottayil and M. Leijon, "Pulse delay control for capacitor voltage balancing in a three-level boost neutral point clamped inverter," in IET Power Electronics, vol. 8, no. 2, pp. 268-277, 2 2015.