再生能源已成為現今能源開發的趨勢，但其發電量無法穩定連續供應，因此常利用雙向電能轉換器，使儲能系統輔以再生能源發電系統穩定供電。然而傳統雙向電能轉換器之開關通常為硬性切換，其切換損失導致轉換器效率降低。本論文研製一個1kW具柔性切換與殘電量偵測功能之直流-直流雙向電能轉換器，無論操作於升壓或降壓模式，主開關皆可達零電流切換功能，轉換器於升壓/降壓模式時，經由數位控制器TMS320LF2407進行回授控制，穩定高壓側輸出電壓，並以混合定電流/定電壓充電方式對儲能系統充電。於殘電量偵測方面，本文使用修正型庫侖量測法，並結合開路電壓法求得其初始電量，據以執行殘電量估測。由實驗之數據證實本文所提電路不論在升壓或降壓模式下，最高轉換器效率皆可較現有硬切電路效率高約2％。在電池殘電量估測方面，本文以四顆型號TEV12260之電池串聯分別進行定負載與變動負載實驗，證實本文之殘電量估測具有相當的準確度。

Renewable energy has become the trend of energy development nowadays. Due to its unreliable and non-continuous nature of power generation, bi-directional power converter is often used to improve the power supply reliability of the renewable energy system. However, hard switching scheme is commonly employed in the traditional switching power converters, resulting in switching losses and lower efficiency of the converters. To ameliorate the energy-conversion system, the thesis thus intends to develop a 1kW bi-directional power converter with soft-switching and state of charge (SOC) estimating functions. The main switch used in the proposed circuit can reach zero-current switching as operated either in boost or buck mode. Through digital controller TMS320LF2407, the high side output voltage of the converter in boost/buck mode is stabilized by using feedback control. Also, a mixed constant current/constant voltage charging function is employed for the energy storage devices. In the SOC estimation method, combined with open-circuit voltage method to estimate the initial energy stored, a modified Coulometric Measurement method is presented in the thesis. The experimental results show that maximum efficiencies of the proposed may have higher efficiency than traditional hard-switching converter by 2% for either boost or buck operating mode. In the experiments of SOC estimation, four batteries of model TEV12260 are used in series for different constant loads and varying loads. The results also reveal that the proposed SOC estimation method has promising accuracy.

[1]H. Li, F. Z. Peng, and J. S. Lawler, “A natural ZVS medium-power bidirectional DC-DC converter with minimum number of devices,” IEEE Transactions on Industry Applications, vol. 39, no. 2, pp. 525-535, 2003.
[2]S. Inoue and H. Akagi, “A bi-directional DC-DC converter for an energy storage system,” IEEE Applied Power Electronics Conference, pp. 761-767, 2007.
[3]S. Han and D. Divan, “Bi-directional DC-DC converters for plug-in hybrid electric vehicle (PHEV) applications,” IEEE Applied Power Electronics Conference, pp. 784-789, 2008.
[4]M. K. Kazimierczuk, D. Q. Vuong, B. T. Nguyen, and J. A. Weimer, “Topologies of bidirectional PWM dc-dc power converters,” IEEE Aerospace and Electronics Conference, vol. 1, pp. 435-441, 1993.
[5]K. Venkatesan, “Current mode controlled bidirectional flyback converter,”IEEE Power Electronics Specialists Conference,vol. 2, pp. 835-842, 1989.
[6]G. Chen, Y. S. Lee, S. Y. R. Hui, D. Xu, and Y. Wang , “Actively clamped bidirectional flyback converter,” IEEE Transactions on Industrial Electronics, vol. 47, no. 4, pp. 770-779, 2000.
[7]Y. Du, X. Zhou, S. Bai, S. Lukic, and A. Huang, “Review of non-isolated bi-directional DC-DC converters for plug-in hybrid electric vehicle charge station application at municipal parking decks,” IEEE Applied Power Electronics Conference, pp. 1145-1151, 2010.
[8]K. Zhiguo, Z. Chunbo, Y. Shiyan, and C. Shukang, “Study of bidirectional DC-DC converter for power management in electric bus with supercapacitors,” IEEE Vehicle Power and Propulsion Conference, pp. 1-5, 2006.
[9]鄭振東，新型柔性切換式電源技術入門，全華，民國九十二年。
[10]C. C. Hua, T. Y. Tasi, C. W. Chuang, and W. B. Shr, “Design and implementation of a residual capacity estimator for lead-acid batteries,” Industrial Electronics and Applications, pp. 2018-2023, 2007.
[11]A. Szumanowski and Y. Chang, “Battery management system based on battery nonlinear dynamics modeling,” IEEE Transactions on Vehicular Technology, vol. 57, no. 3, 2008.
[12]F. Zhang, G. Liu, and L. Fang, “Battery state estimation using unscented kalman filter,” IEEE Robotics and Automation , pp. 1863-1868, 2009.
[13]E. Manla, A. Nasiri, C. H. Rentel, and M. Hughes “Modeling of Zinc Bromide Energy Storagefor Vehicular Applications,” IEEE Transactions on Industrial Electronics, vol. 57, no. 2, 2010.
[14]T. Yanagihara and A. Kawamura, “Residual capacity estimation of sealed lead-acid batteries for electric vehicles,” IEEE Power Conversion Conference, vol. 2, pp. 943-946, 1997.
[15]K. S. Ng, C. S. Moo, Y. P. Chen, and Y. C. Hsieh, “State-of-charge estimation for lead-acid batteries based on dynamic open-circuit voltage,” IEEE Power and Energy Conference, pp. 972-976, 2008.
[16]J. Chiasson and B. Vairamohan, “Estimating the state of charge of a battery,” IEEE Transactions on control systems technology, vol. 13, no. 3, pp. 465-470, 2005.
[17]I. S. Kim, “Nonlinear state of charge estimator for hybrid electric vehicle battery,” IEEE Transactions on power Electronics, vol. 23, no. 4, pp. 2027-2034, 2008.
[18]K. Kutluay, Y. Çadırcı, Y. S. Özkazanç, and I. Çadırcı, “A new online state-of-charge estimation and monitoring system for sealed lead–acid batteries in telecommunication power supplies,” IEEE Transactions on Industrial Electronics, vol. 52, no. 5, pp. 1315-1327, 2005.
[19]K. S. Ng, C. S. Moo, Y. P. Chen, and Y. C. Hsieh, “Enhanced coulomb counting method for estimating state-of-charge and state-of-health of lithium-ion batteries,” Applied Energy 86, pp. 1506–1511 ,2009.
[20]K. S. Ng, Y. F. Huang, C. S. Moo, and Y. C. Hsieh, “An enhanced coulomb counting method for estimating state-of-charge and state-of-health of lead-acid batteries,” Telecommunications Energy Conference, pp. 1-5, 2009.
[21]鄭福剛，智慧型電動機車電池充殘電管理與診斷，國立中山大學，電機工程所，碩士學位論文，民國90年。
[22]段人豪，鉛酸電池量測技術之研究，高雄應用科技大學，電機工程所，碩士學位論文，民國94年。
[23]謝智承，複合動力機車之電池殘電偵測，國立中正大學，電機工程所，碩士學位論文，民國96年。
[24]C. C. Hua and M. Y. Lin, “A study of charging control of lead-acid battery for electric vehicles,” IEEE International Symposium on Industrial Electronics, vol. 1, pp. 135-140, 2000.
[25]梁適安，交換式電源供給器之理論與實務設計，全華，2006。
[26]唐碩甫，零電壓柔性切換半橋式DC-DC電力轉換器之分析研製及控制器設計，國立成功大學，工程科學研究所，碩士學位論文，民國93年。
[27]Yuasa電池，TEV12260鉛酸電池datasheet 。
[28]董勝源，DSP TMS320LF2407與C語言控制實習，長高，民國93年。
[29]B. Bletterie, R. Bründlinger, H. Häberlin, F. Baumgartner, H. Schmidt, B. Burger, G. Klein, and M. A. Abella, “Redefinition of the european efficiency—finding the compromise between simplicity and accuracy,” European photovoltaic solar energy Conference, pp. 2735-2742, 2008.