Research on EPS Modulation Strategy of DAB Converter with Low Surge Current

Zhuo Sun; Ziliang Tao; Fanqing Jin

doi:10.54097/f6xy3184

Authors

Zhuo Sun
Ziliang Tao
Fanqing Jin

DOI:

https://doi.org/10.54097/f6xy3184

Keywords:

Dual Active Bridge (DAB), Extended Phase Shift (EPS) Modulation, Surge Current, Soft Switching, Power Transmission

Abstract

Aiming at the problem that the Dual Active Bridge (DAB) converter has a relatively large surge current under the traditional modulation strategy, an improved extended phase shifted (EPS) modulation strategy is proposed. By introducing additional phase-shift angle control, this strategy increases the control degrees of freedom, enabling more precise regulation of the converter’s operating state. The working principle, operating modes, and power transmission characteristics of the improved EPS modulation strategy are elaborated in detail. The mathematical model of the converter is established. Theoretical analysis and simulation verification demonstrate that the new EPS modulation strategy can effectively reduce the surge current of the DAB converter during startup and abrupt phase-shift angle changes, enhancing the converter’s stability and reliability. It can also maintain high efficiency and excellent performance under working conditions such as light load and wide voltage input. Experimental verification shows that under 20% rated load, the peak surge current of the improved EPS is 1.1 A, a 47.12% reduction compared with the traditional EPS. When the load suddenly increases from 20% to 80%, the output voltage recovery time is only 20 ms, superior to the 50 ms of the traditional EPS.

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References

[1] Azhar A M, Zeyar A .Ensemble Learning Approach for Probabilistic Forecasting of Solar Power Generation[J]. Energies, 2016, 9(12):1017. DOI: https://doi.org/10.3390/en9121017

[2] Chen B , Wang M , Hu L ,et al. Data-driven Koopman model predictive control for hybrid energy storage system of electric vehicles under vehicle-following scenarios[J]. Applied Energy, 2024, 365. DOI: https://doi.org/10.1016/j.apenergy.2024.123218

[3] Li S , Li Z , Shahidehpour M ,et al. Dispatchable region for distributed renewable energy generation in reconfigurable AC–DC distribution networks with soft open points[J].Applied Energy, 2024, 371. DOI: https://doi.org/10.1016/j.apenergy.2024.123704

[4] N. Hou, K. Qin, R. Wei, Y. Zhang and Y. W. Li, Control Techniques With Low Computational Burden for a DAB-Based Two-Stage DC–DC EV Charging Converter System,[J]. IEEE Transactions on Power Electronics, vol. 39, no. 9, pp. , Sept. 2024, 10865-10875. DOI: https://doi.org/10.1109/TPEL.2024.3405193

[5] Giuliani F, Delmonte N, Cova P, et al. Soft-starting procedure for dual active bridge converter[C]//2015 IEEE 16th Workshop on Control and Modeling for Power Electronics (COMPEL). Vancouver, BC, Canada, 2015: 1−6. DOI: https://doi.org/10.1109/COMPEL.2015.7236516

[6] 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,.2016, 32 (5): 4095−4106. DOI: https://doi.org/10.1109/TPEL.2016.2593939

[7] Li X , Lin F , Pou J ,et al. Data-Driven Modeling of Zero Voltage Switching of Non-Resonant DAB Converters under TPS Modulation[J].2023 IEEE Applied Power Electronics Conference and Exposition (APEC), 2023:1379-1383. DOI: https://doi.org/10.1109/APEC43580.2023.10131519

[8] Zhang Y, Zong J, Zhang F ,et al.A Comprehensive Optimization Strategy of DAB Converter With Minimal Current Stress and Full Soft Switching in the Whole Operating Range [J].IEEE journal of emerging and selected topics in power electronics, 2024(1):12. DOI: https://doi.org/10.1109/JESTPE.2023.3305502

[9] Kuo S, Chiu H J , Chiang C W ,et al. High Efficiency Dual-Active-Bridge Converter with Triple-Phase-Shift Control for Battery Charger of Electric Vehicles[J]. 2024. DOI: https://doi.org/10.3390/en17020354

[10] Shi Haochen, Wen Huiqing, Hu Yihua, et al. Reactive power minimization in bidirectional DC-DC converters using a unified-phasor-based particle swarm optimization[J]. IEEE Transactions on Power Electronics, 2018, 33(12): 10990–10996. DOI: https://doi.org/10.1109/TPEL.2018.2811711

[11] Li C , Liu J , Du S ,et al.A T-Type DAB-Based Isolated DC-DC-AC Three-Port Converter With High Power Efficiency [J]. IEEE Transactions on Power Electronics, 2023(11 Pt.2):38. DOI: https://doi.org/10.1109/TPEL.2023.3294389

[12] Khan S S , Wen H .A Fast and Low-Cost Open-Circuit Fault Detection and Isolation Technique for Three-Phase Dual-Active-Bridge Converters Based on Finite State Machines[J]. IEEE Transactions on Power Electronics, 2024(2): 39. DOI: 10. 1109/TPEL.2023.3337097. DOI: https://doi.org/10.1109/TPEL.2023.3337097