Abstract：The application of three-port isolated DC/DC converter has been driven largely by the increasing demand for distributed photovoltaic in the field of DC distribution system. It has the advantages of high control flexibility and good power supply reliability. Due to the phase shift angle changes, conventional phase-shift control methods will cause transient impulse and DC bias in the high-frequency chain current of inductance and magnetizing current of the transformer, further increasing the current stress of switches and threating the safe operation of converter. Based on the quantification of the transient DC bias of TAB, the formation mechanism of transient DC bias is analyzed from the driving signals, and the mathematical model of DC bias suppression is constructed. Two typical driving signal methods are proposed. Different from the phase shift control strategy with constant duty cycle, the duty cycle is changed or the zero-voltage stage is added according to the change of phase shift angle. The DC bias of high-frequency chain current and transformer magnetizing current can be suppressed simultaneously in one switching period. The converter transient responses under the conventional phase shift control strategy and the proposed control strategy are compared and analyzed during the step change of phase shift angle and mutation of load power. The simulation and experimental results show that the proposed method is not only suitable for multi-step change of phase-shift angle, but also effective in the continuous change of phase-shift angle.
余雪萍, 涂春鸣, 肖凡, 刘贝. 三端口隔离DC-DC变换器的暂态直流偏置机理及抑制策略[J]. 电工技术学报, 2020, 35(9): 1962-1972.
Yu Xueping, Tu Chunming, Xiao Fan, Liu Bei. Transient DC Bias Mechanism and Suppression Strategy of the Three-Port Isolated DC-DC Converter. Transactions of China Electrotechnical Society, 2020, 35(9): 1962-1972.
[1] 赖昌伟, 黎静华, 陈博, 等.光伏发电出力预测技术研究综述[J]. 电工技术学报, 2019, 34(6): 1201-1217. Lai Changwei, Li Jinghua, Chen Bo, et al.Review of photovoltaic power output prediction technology[J]. Transactions of China Electrotechnical Society, 2019, 34(6): 1201-1217. [2] 高长伟, 刘晓明, 陈海, 等. 光伏市电互补系统建模及其运行特性[J]. 电工技术学报, 2017, 32(5): 204-211. Gao Changwei, Liu Xiaoming, Chen Hai, et al.Modelling and operation characteristics of photovoltaic- grid complementary system[J]. Transactions of China Electrotechnical Society, 2017, 32(5): 204-211. [3] 白建华, 辛颂旭, 刘俊, 等. 中国实现高比例可再生能源发展路径研究[J]. 中国电机工程学报, 2015, 35(14): 3699-3705. Bai Jianhua, Xin Songxu, Liu Jun, et al.Roadmap of realizing the high penetration renewable energy in China[J]. Proceedings of the CSEE, 2015, 35(14): 3699-3705. [4] Duarte J, Hendrix M, Simoes M.Three-port bidi- rectional converter for hybrid fuel cell systems[J]. IEEE Transactions on Power Electronics, 2007, 22(2): 480-487. [5] 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. [6] Bhattacharjee A K, Kutkut N, Batarseh I.Review of multi port converters for solar and energy storage integration[J]. IEEE Transactions on Power Elec- tronics, 2019, 34(2): 1431-1445. [7] 李婧, 袁立强, 谷庆, 等. 一种基于损耗模型的双有源桥DC-DC变换器效率优化方法[J]. 电工技术学报, 2017, 32(14): 66-76. Li Jing, Yuan Liqiang, Gu Qing, et al.An efficiency optimization method in dual active bridge DC-DC converter based on loss model[J]. Transactions of China Electrotechnical Society, 2017, 32(14): 66-76. [8] 杨景熙, 刘建强, 张捷频, 等. 基于双有源桥式DC-DC变换器的电力电子牵引变压器的电压平衡控制[J]. 电工技术学报, 2016, 31(1): 119-127. Yang Jingxi, Liu Jianqiang, Zhang Jiepin, et al.Voltage balance control of a power electronic traction transformer based on dual active bridge DC-DC converters[J]. Transactions of China Electrotechnical Society, 2016, 31(1): 119-127. [9] 赵彪, 宋强, 刘文华, 等. 用于柔性直流配电的高频链直流固态变压器[J]. 中国电机工程学报, 2014, 34(25): 4295-4303. Zhao Biao, Song Qiang, Liu Wenhua, et al.High- frequency-link DC solid state transformers for flexible DC distribution[J]. Proceedings of the CSEE, 2014, 34(25): 4295-4303. [10] Falcones S, Ayyanar R, Mao Xiaolin.A DC-DC multiport-converter-based solid-state transformer integrating distributed generation and storage[J]. IEEE Transactions on Power Electronics, 2013, 28(5): 2192-2203. [11] Bolduc L, Granger M, Pare G, et al.Development of a DC current-blocking device for transformer neutrals[J]. IEEE Transactions on Power Delivery, 2005, 20(1): 163-168. [12] Baguley C A, Carsten B, Madawala U K.The effect of DC bias conditions on ferrite core losses[J]. IEEE Transactions on Magnetics, 2008, 44(2): 246-252. [13] Li Jieli, Abdallah T, Sullivan C R.Improved calcu- lation of core loss with nonsinusoidal waveforms[C]// IEEE Industry Applications Conference, Chicago, 2001: 2203-2210. [14] 李微, 周雪松, 马幼捷, 等. 三端口直流微网母线电压控制器及多目标控制[J]. 电工技术学报, 2019, 34(1): 92-102. Li Wei, Zhou Xuesong, Ma Youjie, et al.Three-port DC microgrid bus voltage controller and multi- objective control[J]. Transactions of China Electro- technical Society, 2019, 34(1): 92-102. [15] Zhao Chuanhong, Round S D, Kolar J W.An isolated three-port bidirectional DC-DC converter with decoupled power flow management[J]. IEEE Transactions on Power Electronics, 2008, 23(5): 2443-2453. [16] 涂春鸣, 栾思平, 肖凡, 等. 三端口直流能量路由器在TCM调制下的优化控制策略[J]. 电网技术, 2018, 42(8): 2503-2511. Tu Chunming, Luan Siping, Xiao Fan, et al.Optimal control strategy of three-port DC energy router under TCM modulation[J]. Power System Technology, 2018, 42(8): 2503-2511. [17] Ortiz G, Fassler L, Kolar J W, et al.Flux balancing of isolation transformers and application of “the magnetic ear” for closed-loop volt-second compensation[J]. IEEE Transactions on Power Electronics, 2014, 29(8): 4078-4090. [18] Zhao Biao, Song Qiang, Liu Wenhua, et al.Transient DC bias and current impact effects of high- frequency-isolated bidirectional DC-DC converter in practice[J]. IEEE Transactions on Power Electronics, 2016, 31(4): 3203-3216. [19] 杭丽君, 吕征宇, Josep M Guerrero.中大功率单级功率因数校正变换器中的偏磁分析及其数字化抑制技术[J]. 中国电机工程学报, 2009, 29(3): 14-22. Hang Lijun, Lü Zhengyu, Josep M Guerrero.Flux DC bias and digital suppression scheme for isolated power factor correction converter[J]. Proceedings of the CSEE, 2009, 29(3): 14-22. [20] 雷涛, 李龙春, 邬岑颖, 等. 双有源桥DC-DC暂态直流偏置分析和抑制策略研究[J]. 电气工程学报, 2018, 13(7): 8-15. Lei Tao, Li Longchun, Wu Cenying, et al.Study of transient DC bias analysis and suppression methods in dual active bridge converter[J]. Journal of Electrical Engineering, 2018, 13(7): 8-15. [21] 杨敏. PWM加移相控制双有源全桥双向DC-DC变换器的研究[D]. 南京: 南京航空航天大学, 2013. [22] Tao H, Kotsopoulos A, Duarte J L, et al.Family of multiport bidirectional DC-DC converters[J]. IEE Proceedings-Electric Power Applications, 2006, 153(3): 450-458.
2020, Vol. 35 
