Abstract：In this paper, Dual Buck/Boost integrated dual active bridge (DAB) three-port DC-DC converter combines the conventional DAB and two bidirectional Buck/Boost circuits. Hence power switches are shared, and the power density is improved. The PV-battery hybrid power system is taken as an example to analyze the proposed converter topology. The phase shift plus PWM control is adopted here. The phase shift angle is used to control the power flow between the input port and the output port, while the duty cycle is employed to match the input voltages. Thus the maximum power point tracking (MPPT) can be achieved and the power flow between PV and battery can be balanced. The basic operation principles, steady state characteristics and zero voltage switching (ZVS) conditions are analyzed. The ZVS conditions for the conventional DAB operating in small phase shift angle can be greatly improved, and thus the converter can operate under ZVS in a wide operation range. A 300 W converter prototype is built to verify all considerations.
[1] Bryan J, Duke R, Round S. Decentralized generator scheduling in a nanogrid using DC bus signaling[C]// IEEE Power Engineering Society General Meeting, Denver, 2004, 1: 977-982. [2] 戚永志, 刘玉田. 风光储联合系统输出功率滚动优化与实时控制[J]. 电工技术学报, 2014, 29(8): 265-273. Qi Yongzhi, Liu Yutian. Output power rolling opti- mization and real-time control in wind-photo- voltaic-storage hybrid system[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 265- 273. [3] 王冕, 田野, 李铁民, 等. 应用于储能系统的双向DC-DC变换器研究[J]. 电工技术学报, 2013, 28(8): 66-71. Wang Mian, Tian Ye, Li Tiemin, et al. Study of bidirectional DC-DC converter applied to energy storage system[J]. Transactions of China Electro- technical Society, 2013, 28(8): 66-71. [4] 路欣怡, 刘念, 陈征, 等. 电动汽车光伏充电站的多目标优化调度方法[J]. 电工技术学报, 2014, 29(8): 46-56. Lu Xinyi, Liu Nian, Chen Zheng, et al. Multiob- jective optimal scheduling for PV-assisted charging station of electric vehicles[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 46-56. [5] 李芳, 游小杰, 李艳. 航天用非隔离集成三端口变换器的建模与控制系统设计[J]. 电工技术学报, 2014, 29(增1): 291-300. Li Fang, You Xiaojie, Li Yan. Modeling and control loop design of non-isolated three-port DC-DC converter for satellite applications[J]. Transactions of China Electrotechnical Society, 2014, 29(S1): 291- 300. [6] Solero L, Lidozzi A, Pomilio J A. Design of multiple-input power converter for hybrid vehicles[J]. IEEE Transactions on Power Electronics, 2005, 20(5): 1007-1016. [7] 李艳, 阮新波, 杨东升, 等. 带缓冲单元的多输入直流变换器电路拓扑[J]. 电工技术学报, 2009, 24(6): 62-68. Li Yan, Ruan Xinbo, Yang Dongsheng, et al. Multiple-input DC/DC converters with buffer cells[J]. Transactions of China Electrotechnical Society, 2009, 24(6): 62-68. [8] Tao H, Kotssopoulos A, Duarte J L, et al. Family of multiport bidirectional DC-DC converters[J]. IEE Proceedings of Electric Power Applications, 2006, 153(3): 451-458. [9] Liu Danwei, Li Hui. A ZVS bi-directional DC-DC converter for multiple energy storage elements[J]. IEEE Transactions on Power Electronics, 2006, 21(5): 1513-1517. [10] Tao Haiming, Duarte J L, Hendrix M A M. Three- port triple-half-bridge bidirectional converter with zero-voltage switching[J]. IEEE Transactions on Power Electronics, 2008, 23(2): 782-792. [11] Tao Haiming, Kotsopoulos A, Duarte J L, et al. Transformer coupled multiport ZVS bidirectional DC-DC converter with wide input range[J]. IEEE Transactions on Power Electronics, 2008, 23(2): 771-781. [12] Zhao Chuanhong, Round S D, Kolar J W. An isolated three-port bidirectional DC-DC converter with decou- pled power flow management[J]. IEEE Transactions on Power Electronics, 2008, 23(5): 2443-2453. [13] Krishnaswami H, Mohan N. Three-port series- resonant DC-DC converter to interface renewable energy sources with bidirectional load and energy storage ports[J]. IEEE Transactions on Power Electronics, 2009, 24(10): 2289-2297. [14] Al-Atrash H, Batarseh I. Boost-integrated phase-shift full-bridge converters for three-port interface[C]// IEEE Power Electronics Specialists Conference, Orlando, FL, 2007: 2313-2321. [15] Li Wuhua, Xiao Jianguo, Zhao Yi, et al. PWM plus phase angle shift (PPAS) control scheme for combined multiport DC/DC converters[J]. IEEE Transactions on Power Electronics, 2012, 27(3): 1479-1489. [16] Xu Chi, Gu Yunjie, Luo Haoze, et al. Performance analysis of coupled inductor based multiple-input DC/DC converter with PWM plus phase-shift (PPS) control strategy[C]//IEEE Energy Conversion Con- gress and Exposition, Melbourne, VIC, 2013: 994- 998. [17] Doncker R W, Divan D M, Kheraluwala M H. A three-phase soft-switched high-power-density DC/DC converter for high-power applications[J]. IEEE Transactions on Industry Applications, 1991, 27(1): 63-73. [18] Peng Fangzheng, Li Hui, Su Guijia, et al. A new ZVS bidirectional DC-DC converter for fuel cell and battery application[J]. IEEE Transactions on Power Electronics, 2004, 19(1): 54-65. [19] Pan Zizhou, Liu Fuxin, Ruan Xinbo. Soft-switching analysis of a boost-integrated bidirectional DC/DC converter[C]//IEEE Power Electronics and Motion Control Conference, Harbin, 2012, 3: 1804-1811. [20] 杨水涛, 张帆, 丁新平, 等. 基于输入-输出参数的光伏电池最大功率控制的比较[J]. 电工技术学报, 2009, 24(6): 95-103. Yang Shuitao, Zhang Fan, Ding Xinping, et al. Isolated multiple input DC-DC converter using alternative pulsating source as building cells[J]. Transactions of China Electrotechnical Society, 2009, 24(6): 95-103. [21] Elgendy M, Zahawi B, Atkinson D J. Assessment of perturb and observe MPPT algorithm implementation techniques for PV pumping applications[J]. IEEE Transactions on Sustainable Energy, 2012, 3(1): 21-33. [22] Femia N, Lisi G, Petrone G, et al. Distributed maximum power point tracking of photovoltaic arrays: novel approach and system analysis[J]. IEEE Transa- ctions on Industrial Electronics, 2008, 55(7): 2610- 2621.
2016, Vol. 31 
