Performance Analysis of Bidirectional CLLLC Resonant Converter with Synchronous PWM Control Strategy
Li Shucheng, Liu Bangyin, Jiang Qing, Duan Shanxu
State Key Laboratory of Electromagnetic Engineering and New Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Abstract：Aiming at the bidirectional DC-DC converter which is required for achieving electrical isolation, energy bidirectional transmission in DC distribution network, a bidirectional CLLLC resonant converter with synchronous PWM control strategy is proposed in this paper. In this way, the proposed converter is simple in structure with good soft-switching characteristics. The control scheme is easy to implement, otherwise, compared to other bidirectional resonant converter with variable frequency control, it has the same operating characteristics no matter the direction of power flow and can change the direction of power flow automatically and smoothly between forward mode and backward mode. In this paper, the principle of proposed converter is presented, Besides, based on equivalent circuit, the characteristics of power transmission and soft-switching ability are analyzed in detail, which offers the guidance for resonant tank parameter design. Finally, the feasibility and effectiveness of the proposed converter are fully verified by the experimental results from a 1.65kW prototype based on GaN-HEMT with peak efficiency of 98.4%.
[1] 宋强, 赵彪, 刘文华, 等. 智能直流配电网研究综述[J]. 中国电机工程学报, 2013, 33(25): 9-19. Song Qiang, Zhao Biao, Liu Wenhua et al. An overview of research on smart DC distribution power network[J]. Proceedings of the CSEE, 2013, 33(25): 9-19. [2] 雷志方, 汪飞, 高艳霞, 等. 面向直流微网的双向DC-DC变换器研究现状和应用分析[J]. 电工技术学报, 2016, 31(22): 137-147. Lei Zhifang, Wang Fei, Gao Yanxia, et al.Research status and application analysis of bidirectional DC-DC converters in DC microgrids[J]. Transa- ctions of China Electrotechnical Society, 2016, 31(22): 137-147. [3] Ryu M, Kim H, Kim J, et al.Implementation of 380V DC distribution system using isolated bidirectional power converters[C]//IEEE Energy Conversion Con- gress and Exposition, Denver, 2013: 2948-2954. [4] Wang F, Pei Yunqing, Boroyevich D, et al.AC vs. DC distribution for off-shore power delivery[C]//34th Industrial Electronics Conference of IEEE, Orlando, 2008: 2113-2118. [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 charging technologies based on dual-active-bridge converter[J]. Transaction of China Electrotechnical Society, 2016, 31(2): 121-127. [6] 李建国, 赵彪, 宋强, 等. 适用于中高压直流电网的开关电容接入式直流变压器[J]. 电工技术学报, 2018, 33(4): 817-825. Li Jianguo, Zhao Biao, Song Qiang, et al.DC transformer based on switched capacitor in high and medium voltage DC power system[J]. Transaction of China Electrotechnical Society, 2018, 33(4): 817-825. [7] Zhao Biao, Song Qiang, Liu Wenhua, et al.Overview of dual-active-bridge isolated bidirectional DC-DC converter for high-frequency-link power-conversion system[J]. IEEE Transactions on Power Electronics, 2014, 29(8): 4091-4106. [8] Jung J H, Kim H S, Ryu M H, et al.Design methodology of bidirectional CLLC resonant converter for high-frequency isolation of DC distribution systems[J]. IEEE Transactions on Power Electronics, 2013, 28(4): 1741-1755. [9] Pledl G, Tauer M, Buecherl D.Theory of operation, design procedure and simulation of a bidirectional LLC resonant converter for vehicular applications[C]// IEEE Vehicle Power and Propulsion Conference, Lille, 2010: 1-5. [10] Twiname R P, Thrimawithana D J, Madawala U K, et al.A dual-active bridge topology with a tuned CLC network[J]. IEEE Transactions on Power Electronics, 2015, 30(12): 6543-6550. [11] Chen Wei, Rong Ping, Lu Zhengyu.Snubberless bidirectional DC-DC converter with new CLLC resonant tank featuring minimized switching loss[J]. IEEE Transactions on Industrial Electronics, 2010, 57(9): 3075-3086. [12] 江添洋, 张军明, 汪槱生. 同步控制双向LLC谐振变换器[J]. 电工技术学报, 2015, 30(12): 87-96. Jiang Tianyang, Zhang Junming, Wang Yousheng.Bidirectional LLC resonant converter with synchronous control method[J]. Transactions of China Electro- technical Society, 2015, 30(12): 87-96. [13] Jung J, Kim H, Ryu M, et al.Design methodology of bidirectional CLLC resonant converter for high- frequency isolation of DC distribution systems[J]. IEEE Transactions on Power Electronics, 2013, 28(4SI): 1741-1755. [14] 陈启超, 王建赜, 纪延超. 双向LLC谐振型直流变压器的软启动及功率换向控制[J]. 电工技术学报, 2014, 29(8): 180-186. Chen Qichao, Wang Jianze, Ji Yanchao.Control scheme of bidirectional LLC resonant DC-DC transformer for soft start and power conversion[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 180-186. [15] Liu G, Jang Y, Jovanović M M, et al.Implement- ation of a 3.3kW DC-DC converter for EV on-board charger employing the series-resonant converter with reduced-frequency-range control[J]. IEEE Transa- ctions on Power Electronics, 2017, 32(6): 4168-4184. [16] Hou Nie, Song Wensheng, Wu Mingyu.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): 8522-8561. [17] 于德, 付超, 王毅, 等. 隔离型双向直流变换器的最小回流功率移相控制方法[J]. 电工技术学报, 2017, 32(24): 126-138. Yu De, Fu Chao, Wang Yi, et al.The phase-shifted control method of isolated bidirectional DC-DC converter with minimum backflow power[J]. Transa- ction of China Electrotechnical Society, 2017, 32(24): 126-138. [18] Wu Hongfeng, Ding Shun, Sun Kai, et al.Bidirectional soft-switching series-resonant converter with simple PWM control and load-independent voltage-gain characteristics for energy storage system in DC microgrids[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2017, 5(3): 995-1007.
2019, Vol. 34 
