Minimum Reflux Power Strategy of Three-Level Dual Active Bridge DC-DC Converter with Phase Shift Control
Jin Li, Liu Bangyin, Duan Shanxu
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Abstract：Three-level dual active bridge (3L-DAB) DC-DC converter adds another control degree of freedom by introducing the 3L legs into DAB converters, which will enhance the regulating flexibility. 3L-DAB under phase shift control will produce large reflux power, resulting in high power loss and low system efficiency. For this problem, this paper proposes a phase shift control strategy with minimum reflux power. The mathematical models of reflux power and transmission power of 3L-DAB are established, and the relationship equations among the minimum reflux power, phase shift ratios and voltage conversion ratio are deduced. The minimum reflux power and the corresponding optimal phase shift ratio are calculated by using the segmentation optimization algorithm in different ranges of transmission power and voltage conversion ratio. Comparative analysis of reflux power between the optimal and conventional phase shift controls has been carried out. The proposed strategy can minimize the reflux power, reduce the inductor current stress and improve the system efficiency in a wider voltage conversion ratio. An experimental prototype was developed based on the proposed strategy, and the experimental results verify the effectiveness of the minimum reflux power switching strategy and the correctness of the theoretical analysis.
金莉, 刘邦银, 段善旭. 三电平双有源全桥DC-DC变换器回流功率最小的移相控制[J]. 电工技术学报, 2018, 33(24): 5864-5873.
Jin Li, Liu Bangyin, Duan Shanxu. Minimum Reflux Power Strategy of Three-Level Dual Active Bridge DC-DC Converter with Phase Shift Control. Transactions of China Electrotechnical Society, 2018, 33(24): 5864-5873.
[1] Zhang Zhe, Ouyang Ziwei, Thomsen O C, et al.Analysis and design of a bidirectional isolated DC-DC converter for fuel cells and supercapacitors hybrid system[J]. IEEE Transactions on Power Electronics, 2012, 27(2): 848-859. [2] Ding Z, Yang C, Zhang Z, et al.A novel soft- switching multiport bidirectional DC-DC converter for hybrid energy storage system[J]. IEEE Transa- ctions on Power Electronics, 2014, 29(3): 1595-1609. [3] Hoek H V, Neubert M, De Doncker R W. Enhanced modulation strategy for a three-phase dual active bridge-boosting efficiency of an electric vehicle converter[J]. IEEE Transactions on Power Elec- tronics, 2013, 28(12): 5499-5507. [4] Krismer F, Kolar J W.Accurate small-signal model for the digital control of an automotive bidirectional dual active bridge[J]. IEEE Transactions on Power Electronics, 2009, 24(12): 2756-2768. [5] 师长立, 唐西胜, 李宁宁, 等. 基于全桥隔离双向变换器的直流变换技术[J]. 电工技术学报, 2016, 31(2): 121-127. Shi Changli, Tang Xisheng, Li Ningning, et al. DC changing technologies based on dual-active-bridge converter[J]. Transactions of China Electrotechnical Society, 2016, 31(2): 121-127. [6] Hua Bai, Mi Chris.Eliminate reactive power and increase system efficiency of isolated bidirectional dual- active-bridge DC-DC converters using novel dual- phase-shift control[J]. IEEE Transactions on Power Electronics, 2008, 23(6): 2905-2914. [7] Krismer F, Kolar J W.Efficiency-optimized high- current dual active bridge converter for automotive applications[J]. IEEE Transactions on Industrial Electronics, 2012, 59(7): 2745-2760. [8] Wu Kuiyuan, De Silva C W, Dunford W G. Stability analysis of isolated bidirectional dual active full- bridge DC-DC converter with triple phase-shift control[J]. IEEE Transactions on Power Electronics, 2012, 27(4): 2007-2017. [9] Shen Yanfeng, Sun Xiaofeng, Li Wenying, et al.A modified dual active bridge converter with hybrid phase-shift control for wide input voltage range[J]. IEEE Transactions on Power Electronics, 2016, 31(10): 6884-6900. [10] Liu X, Zhu Z Q, Stone D A, et al.Novel dual phase shift control with bi-directional inner phase shifts for dual active bridge converter having low surge current and stable power control[J]. IEEE Transactions on Power Electronics, 2017, 32(5): 4095-4106. [11] 张勋, 王广柱, 王婷. 双向全桥DC-DC变换器基于电感电流应力的双重移相优化控制[J]. 电工技术学报, 2016, 31(22): 100-106. Zhang Xun, Wang Guangzhu, Wang Ting. Optimized control based on current-stress of bi-directional full-bridge DC-DC converters with dual-phase- shifting control[J]. Transactions of China Electro- technical Society, 2016, 31(22): 100-106. [12] 吴俊娟, 孟德越, 申彦峰, 等. 双重移相控制与传统移相控制相结合的双有源桥式DC-DC变换器优化控制策略[J]. 电工技术学报, 2016, 31(19): 97- 105. Wu Junjuan, Meng Deyue, Shen Yanfeng, et al. Optimal control strategy of dual active bridge DC-DC converter with combined dual-phase-shift and traditional-phase-shift controls[J]. Transactions of China Electrotechnical Society, 2016, 31(19): 97-105. [13] Zhao Biao, Song Qiang, Liu Wenhua.Power characterization of isolated bidirectional dual- active-bridge DC-DC converter with dual-phase-shift control[J]. IEEE Transactions on Power Electronics, 2012, 27(9): 4172-4176. [14] Kim M, Rosekeit M, Sul S K, et al.A dual- phase-shift control strategy for dual-active-bridge DC-DC converter in wide voltage range[C]// Proceedings of 8th International Conference on Power Electronics, Shilla Jeju, Korea, 2011: 364-371. [15] Zhao Biao, Song Qiang, Liu Wenhua, et al.Current- stress-optimized switching strategy of isolated bidirectional DC-DC converter with dual-phase-shift control[J]. IEEE Transactions on Industrial Elec- tronics, 2013, 60(10): 4458-4467. [16] Hou Nie, Song Wensheng, Wu Mingyi.Minimum- current-stress scheme of dual active bridge DC-DC converter with unified phase-shift control[J]. IEEE Transactions on Power Electronics, 2016, 31(12): 8552-8561. [17] 赵彪, 于庆广, 孙伟欣. 双重移相控制的双向全桥DC-DC 变换器及其功率回流特性分析[J]. 中国电机工程学报, 2012, 32(12): 43-50. Zhao Biao, Yu Qingguang, Sun Weixin. Bi- directional full-bridge DC-DC converters with dual- phase-shifting control and its backflow power characteristic analysis[J]. Proceedings of the CSEE, 2012, 32(12): 43-50. [18] 程红, 高巧梅, 朱锦标, 等. 基于双重移相控制的双向全桥DC-DC变换器动态建模与最小回流功率控制[J]. 电工技术学报, 2014, 29(3): 245-253. Cheng Hong, Gao Qiaomei, Zhu Jinbiao, et al. Dynamic modeling and minimum backflow power controlling of the bi-directional full-bridge DC-DC converters based on dual-phase-shifting control[J]. Transactions of China Electrotechnical Society, 2014, 29(3): 245-253. [19] 侯聂, 宋文胜, 王顺亮. 全桥隔离DC/DC变换器相移控制归一化及其最小回流功率控制[J]. 中国电机工程学报, 2016, 36(2): 499-506. Hou Nie, Song Wensheng, Wang Shunliang. Norma- lization of phase shift control and minimum reflux power control of full-bridge isolated DC/DC converters[J]. Proceedings of the CSEE, 2016, 36(2): 499-506. [20] 侯聂, 宋文胜. 全桥隔离DC/DC变换器的三重移相控制及其软启动方法[J]. 中国电机工程学报, 2015, 35(23): 6113-6121. Hou Nie, Song Wensheng. Full-bridge isolated DC/ DC converters with triple-phase-shift control and soft starting control method[J]. Proceedings of the CSEE, 2015, 35(23): 6113-6121. [21] 张勋, 王广柱, 商秀娟, 等. 双向全桥DC-DC变换器回流功率优化的双重移相控制[J]. 中国电机工程学报, 2016, 36(4): 1090-1097. Zhang Xun, Wang Guangzhu, Shang Xiujuan, et al. An optimized strategy based on backflow power of bi-directional dual-active-bridge DC-DC converters with dual-phase-shifting control[J]. Proceedings of the CSEE, 2016, 36(2): 499-506. [22] Jing Penghui, Wang Cong, Jiang Wei, et al.Performance analysis of isolated three-level half- bridge bidirectional DC/DC converter[C]//Proceedings of IEEE 7th International Power Electronics and Motion Control Conference, Harbin, China, 2012: 1527-1531. [23] Moonem M A, Krishnaswami H.Control and configuration of three-level dual-active bridge DC-DC converter as a front-end interface for photo- voltaic system[C]//Proceedings of IEEE Applied Power Electronics Conference and Exposition, Texas, USA, 2014: 3017-3020. [24] Zhao Zhihong, Zhao Jianfeng.Analysis and control of a three-level power energy storage system with dual active bridge DC-DC converter[C]//Proceedings of the 9th International Conference on Power Electronics and ECCE, Asia, Seoul, Korea, 2015: 1638-1643. [25] Filba-Martinez A, Busquets-Monge S, Nicolas- Apruzzese J, et al.Operating principle and performance optimization of a three-level NPC dual- active-bridge DC-DC converter[J]. IEEE Transactions on Industrial Electronics, 2016, 63(2): 678-690. [26] Li Jin, Liu Bangyin, Duan Shanxu.ZVS operation range analysis of three-level dual active bridge DC- DC converter with phase-shift control[C]//Proceedings of IEEE Applied Power Electronics Conference and Exposition (APEC), Tampa, USA, 2017: 362-366.
2018, Vol. 33 
