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| Hybrid Modulation Strategy for Wide Load Range ZVS and Reactive Power Circulation Optimization in DAB Micro-Inverters Considering Excitation Current |
| Huang Wencong1, Jiang Xuanyan1, Rao Tianbiao1, Chang Yufang1, Yan Huaicheng2 |
1. Hubei Collaborative Innovation Centre for High-Efficiency Utilization of Solar Energy Hubei University of Technology Wuhan 430068 China;
2. College of Information Science and Engineering East China University of Science and Technology Shanghai 200237 China |
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Abstract The dual-active-bridge (DAB) DC-AC converter technology, due to its efficient and flexible power conversion characteristics, has become a key technology for improving energy efficiency and system stability. However, because of the wide output voltage range and considerable output power variation, it is challenging for the DAB DC-AC converter to achieve zero-voltage switching (ZVS) for all switches over a wide output voltage and power range. Additionally, the ZVS condition of the primary lagging switch in the DAB DC-AC converter leads to reactive power during high-frequency power transmission, increasing the conduction loss of the switches. To reduce the impact of these issues on the transmission efficiency of the DAB DC-AC converter, this paper proposes a hybrid modulation control strategy based on mode switching. This strategy combines frequency control with extended phase-shift control to expand the ZVS zone of the DAB micro-inverter while optimizing the circulating power.
Firstly, the ZVS characteristics and reactive power characteristics of two extended phase-shift modulation modes of the DAB micro-inverter are analyzed, and a phase-shift trajectory with minimum circulating power within the ZVS zone is proposed. Then, a frequency control law is designed, which increases the switching frequency under light load conditions to expand the ZVS zone and decreases the switching frequency under heavy load conditions to reduce the turn-off loss of the switches. At the same time, A control loop is constructed to achieve precise control of the current. Finally, a 400 W experimental platform is established, and the superiority of the proposed algorithm is verified through experiments.
According to experimental results, the proposed control strategy can achieve ZVS for all switches under full load and 20% load conditions. Compared with other phase-shift strategies operating within the ZVS zone under light load conditions, the proposed algorithm reduces the transformer current stress by about 40% and increases efficiency by about 3%. The maximum efficiency of the experimental prototype is 95.69%. The following conclusions are drawn: (1) The proposed phase-shift angle trajectory considers the effects of excitation inductance and the output capacitance of switches. It minimizes reactive power while ensuring ZVS for all switches. (2) The proposed variable-frequency control law increases the switching frequency under light-load conditions, extending the ZVS zone to 20% of the rated power. Under heavy-load conditions, it reduces the switching frequency to minimize turn-off losses. (3) The proposed control loop balances the effects of the filter inductance and the half-bridge capacitance on the output current phase, thereby achieving precise output current control.
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Received: 15 April 2025
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[1] Manandhar U, Tummuru N R, Kollimalla S K, et al.Validation of faster joint control strategy for battery-and supercapacitor-based energy storage system[J]. IEEE Transactions on Industrial Electronics, 2018, 65(4): 3286-3295.
[2] 赵彪, 安峰, 宋强, 等. 双有源桥式直流变压器发展与应用[J]. 中国电机工程学报, 2021, 41(1): 288-298, 418.
Zhao Biao, An Feng, Song Qiang, et al.Development and application of DC transformer based on dual-active-bridge[J]. Proceedings of the CSEE, 2021, 41(1): 288-298, 418.
[3] Yilmaz M, Krein P T.Review of battery charger topologies, charging power levels, and infrastructure for plug-in electric and hybrid vehicles[J]. IEEE Transactions on Power Electronics, 2013, 28(5): 2151-2169.
[4] Weise N D, Castelino G, Basu K, et al.A single-stage dual-active-bridge-based soft switched AC-DC converter with open-loop power factor correction and other advanced features[J]. IEEE Transactions on Power Electronics, 2014, 29(8): 4007-4016.
[5] Baranwal R, Iyer K V, Basu K, et al.A reduced switch count single-stage three-phase bidirectional rectifier with high-frequency isolation[J]. IEEE Transactions on Power Electronics, 2018, 33(11): 9520-9541.
[6] 余城洋, 李佳, 晏益朋, 等. 图腾柱双有源桥AC-DC变换器的非对称扩展移相优化调制策略[J]. 电工技术学报, 2025, 40(8): 2560-2572.
Yu Chengyang, Li Jia, Yan Yipeng, et al.Asymmetric extended phase shift optimized modulation strategy for totem pole dual active bridge AC-DC converter[J]. Transactions of China Electrotechnical Society, 2025, 40(8): 2560-2572.
[7] 尹政, 邓富金, 王青松, 等. 双有源桥变换器移动离散控制集无模型预测电压控制策略[J]. 电工技术学报, 2025, 40(6): 1853-1863.
Yin Zheng, Deng Fujin, Wang Qingsong, et al.Model-free predictive voltage control with moving-discrete-control-set for dual active bridge converters[J]. Transactions of China Electrotechnical Society, 2025, 40(6): 1853-1863.
[8] 李嘉进, 马翔, 谢宇帆, 等. 输入串联输出并联型三电平双有源桥变换器功率与电压平衡控制策略[J]. 电工技术学报, 2024, 39(10): 3082-3092.
Li Jiajin, Ma Xiang, Xie Yufan, et al.Power and voltage balance control strategy of series input parallel output type three-level dual active bridge converter[J]. Transactions of China Electrotechnical Society, 2024, 39(10): 3082-3092.
[9] 高祎韩, 周子航, 张欣, 等. 双有源桥串联欠谐振变换器的最小回流电流控制[J]. 电工技术学报, 2024, 39(14): 4480-4494.
Gao Yihan, Zhou Zihang, Zhang Xin, et al.Minimum backflow current control of under-resonant-dual-bridge-series-resonant converter[J]. Transactions of China Electrotechnical Society, 2024, 39(14): 4480-4494.
[10] Wu Hongfei, Tang Xinxi, Zhao Jian, et al.An isolated bidirectional microinverter based on voltage-in-phase PWM-controlled resonant converter[J]. IEEE Transa-ctions on Power Electronics, 2021, 36(1): 562-570.
[11] Chen Tianxiang, Yu Ruiyang, Huang A Q.A bidire-ctional isolated dual-phase-shift variable-frequency series resonant dual-active-bridge GaN AC-DC converter[J]. IEEE Transactions on Industrial Elec-tronics, 2023, 70(4): 3315-3325.
[12] Pan Xuewei, Li Hongqi, Liu Yitao, et al.An overview and comprehensive comparative evaluation of current-fed-isolated-bidirectional DC/DC converter[J]. IEEE Transactions on Power Electronics, 2020, 35(3): 2737-2763.
[13] Wang Mengqi, Guo Suxuan, Huang Qingyun, et al.An isolated bidirectional single-stage DC-AC con-verter using wide-band-gap devices with a novel carrier-based unipolar modulation technique under synchronous rectification[J]. IEEE Transactions on Power Electronics, 2017, 32(3): 1832-1843.
[14] Shao Shuai, Jiang Mingming, Ye Weiwen, et al.Optimal phase-shift control to minimize reactive power for a dual active bridge DC-DC converter[J]. IEEE Transactions on Power Electronics, 2019, 34(10): 10193-10205.
[15] 邓丹阳, 陈艳慧. 双有源桥直流变换器三电平扩展移相控制下电感电流有效值最优跟踪控制策略[J].电工技术学报, 2024, 39(18): 5800-5815.
Deng Danyang, Chen Yanhui.Optimal tracking control strategy of inductive current RMS for dual-active bridge DC Converter with three-level extended phase-shift control[J]. Transactions of China Electrotechnical Society, 2024, 39(12): 5800-5815.
[16] Tong Anping, Hang Lijun, Li Guojie, et al.Modeling and analysis of a dual-active-bridge-isolated bidi-rectional DC/DC converter to minimize RMS current with whole operating range[J]. IEEE Transactions on Power Electronics, 2018, 33(6): 5302-5316.
[17] Noroozi N, Poorfakhraei A, Zayed O, et al.RMS current minimization in a SiC-based dual active bridge converter using triple-phase-shift modu-lation[J]. IEEE Transactions on Industrial Electronics, 2023, 70(7): 7173-7182.
[18] Gong Linxiao, Jin Xinyu, Xu Junzhong, et al.A dynamic ZVS-guaranteed and seamless-mode-transition modulation scheme for the DAB converter that maximizes the ZVS range and lowers the inductor RMS current[J]. IEEE Transactions on Power Electronics, 2022, 37(11): 13119-13134.
[19] 陈润田, 李楚杉, 姚文熙, 等. 基于等效励磁电感的SiC串联器件型中压双有源桥变换器的软开关技术[J]. 电工技术学报, 2024, 39(12): 3732-3745.
Chen Runtian, Li Chushan, Yao Wenxi, et al.Soft-switching technique for medium voltage dual active bridge converter with series-connected SiC devices based on equivalent magnetizing indu-ctance[J]. Transactions of China Electrotechnical Society, 2024, 39(12): 3732-3745.
[20] Yang Xiangzhen, Wang Jinxiu, Du Yan, et al.Bidirectional ZVS operation of all switches for a DAB converter over a full range of loads with optimized current stress[J]. IEEE Transactions on Industry Applications, 2024, 60(1): 1183-1195.
[21] Li Ning, Zhang Changjie, Liu Yonghui, et al.Single-degree-of-freedom hybrid modulation strategy and light-load efficiency optimization for dual-active-bridge converter[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2024, 12(4): 3936-3947.
[22] Kwon O, Kim K S, Kwon B H.Highly efficient single-stage DAB microinverter using a novel modulation strategy to minimize reactive power[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2022, 10(1): 544-552.
[23] 郭华越, 张兴, 赵文广, 等. 扩展移相控制的双有源桥DC-DC变换器的优化控制策略[J]. 中国电机工程学报, 2019, 39(13): 3889-3899.
Guo Huayue, Zhang Xing, Zhao Wenguang, et al.Optimal control strategy of dual active bridge DC-DC converters with extended-phase-shift control[J]. Proceedings of the CSEE, 2019, 39(13): 3889-3899.
[24] Lü D, Straathof C, Soeiro T B, et al.ZVS-optimized constant and variable switching frequency modulation schemes for dual active bridge converters[J]. IEEE Open Journal of Power Electronics, 2023, 4: 801-816.
[25] Everts J, Krismer F, Van den Keybus J, et al. Optimal ZVS modulation of single-phase single-stage bidi-rectional DAB AC-DC converters[J]. IEEE Transa-ctions on Power Electronics, 2014, 29(8): 3954-3970.
[26] Li Jia, Luo Quanming, Mou Di, et al.Comprehensive optimization modulation scheme of low current level and wide ZVS range for dual active bridge converter with dead-zone control[J]. IEEE Transactions on Power Electronics, 2022, 37(3): 2731-2748.
[27] Zhang Jiankun, Sha Deshang, Song Keling.Single-phase single-stage bidirectional DAB AC-DC con-verter with extended ZVS range and high effi-ciency[J]. IEEE Transactions on Power Electronics, 2023, 38(3): 3803-3811.
[28] 康薇, 肖飞, 任强, 等. 双有源桥DC-DC变换器三移相调制及其死区效应分析和补偿[J]. 电工技术学报, 2024, 39(6): 1907-1922.
Kang Wei, Xiao Fei, Ren Qiang, et al.Three-phase-shift modulation and its dead band effect analysis and compensation of dual-active-bridge DC-DC converter[J]. Transactions of China Electro-technical Society, 2024, 39(6): 1907-1922.
[29] 王祺, 张泽轲, 王春花. 考虑不同优化指标的双有源桥变换器全局优化控制[J]. 电力系统保护与控制, 2025, 53(5): 113-122.
Wang Qi, Zhang Zeke, Wang Chunhua.Global optimal control of a dual active bridge converter considering different optimization indices[J]. Power System Protection and Control, 2025, 53(5): 113-122.
[30] 杨骐箐, 李睿, 徐君. 基于模式切换的双有源桥型微逆变器优化调制策略[J]. 中国电机工程学报, 2023, 43(23): 9273-9285.
Yang Qiqing, Li Rui, Xu Jun.Optimal modulation dtrategy of dual-active-bridge microinverter based on mode switching[J]. Proceedings of the CSEE, 2023, 43(23):9273-9285.
[31] 王章毅, 陆道荣, 李想, 等. 基于移相和调频的单级双向AC-DC变换器临界电流调制策略[J]. 电工技术学报, 2023, 38(14): 3888-3897.
Wang Zhangyi, Lu Daorong, Li Xiang, et al.Boundary current modulation strategy of single-stage bidirectional AC-DC converter based on phase-shift and variable-frequency control[J]. Transactions of China Electrotechnical Society, 2023, 38(14): 3888-3897.
[32] 王要强, 李灏, 李想, 等. 基于双模式变频移相调制的单级式双有源桥型DC-AC变换器[J]. 电工技术学报, 2024, 39(21): 6865-6876.
Wang Yaoqiang, Li Hao, Li Xiang, et al.A single-stage dual active bridge DC-AC converter based on dual mode modulation of variable frequency and phase shift[J]. Transactions of China Electrotech-nical Society, 2024, 39(21): 6865-6876.
[33] 许晨航. 50kVA三相无功发生与补偿装置设计方法研究[D]. 杭州: 浙江大学, 2021.
Xu Chenhang.Research of the design methods of 50kVA three-phase static var generator and com-pensator[D]. Hangzhou: Zhejiang University, 2021. |
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2026, Vol. 41 
