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Soft Start-Up Control Strategy for Dual Active Bridge Converter with a Supercapacitor

Author

Listed:
  • Min-Soo Kim

    (Department of Electrical Engineering, Pusan National University, Pusan 46241, Korea)

  • Do-Hyun Kim

    (Department of Electrical Engineering, Pusan National University, Pusan 46241, Korea)

  • Dong-Keun Jeong

    (Power Conversion and Control Research Center, HVDC Research Division, KERI, Changwon 51543, Korea)

  • Jang-Mok Kim

    (Department of Electrical Engineering, Pusan National University, Pusan 46241, Korea)

  • Hee-Je Kim

    (Department of Electrical Engineering, Pusan National University, Pusan 46241, Korea)

Abstract

Renewable energy needs are steadily on the rise. Bidirectional DC/DC converters are essential in charging and discharging various storage batteries, such as PV/ESS (photovoltaic/energy storage system). A dual active bridge (DAB) converter, in particular, transfers power in both directions by phase shift using a soiled state transformer (SST). To reduce switching inrush current in batteries under high voltages, a soft start-up is demonstrated during the initial switching operation. When a supercapacitor (SC) is used as a battery, the reverse power caused by the inrush current appears under high voltage at the DC-link side. This causes serious electrical damage to the PV/ESS’ boost converter and inverter. To suppress peak overshoot voltage and stabilize soft start-up transients, we propose a three-step soft start-up controller and algorithm for bidirectional DAB converter implementation at virtual ESS and UPS. The step-by-step control strategy by OLDC (open loop duty control), OLPSC (open loop phase shift control), and OLFC (open loop frequency control) provides a stable soft start-up operation. In the initial stage of the OLDC, the duty ratio is gradually increased by the PWM (Pulse width modulation) signal. In the middle stage, a phase difference is seen as per the voltage of the SC. The OLPSC is performed to reduce the phase difference. In the final stage, the OLFC is performed to smoothly control the small phase difference. The overshoot or inrush current is drastically suppressed toward the DC-link and SC module. Consequently, we demonstrate a proposed controller and algorithm with prototype 5 kW DAB converter.

Suggested Citation

  • Min-Soo Kim & Do-Hyun Kim & Dong-Keun Jeong & Jang-Mok Kim & Hee-Je Kim, 2020. "Soft Start-Up Control Strategy for Dual Active Bridge Converter with a Supercapacitor," Energies, MDPI, vol. 13(16), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:16:p:4083-:d:395588
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    References listed on IDEAS

    as
    1. P. Sathishkumar & T. N. V. Krishna & Himanshu & Muhammad Adil Khan & Kamran Zeb & Hee-Je Kim, 2018. "Digital Soft Start Implementation for Minimizing Start Up Transients in High Power DAB-IBDC Converter," Energies, MDPI, vol. 11(4), pages 1-18, April.
    2. Muhammad Umair Mutarraf & Yacine Terriche & Kamran Ali Khan Niazi & Juan C. Vasquez & Josep M. Guerrero, 2018. "Energy Storage Systems for Shipboard Microgrids—A Review," Energies, MDPI, vol. 11(12), pages 1-32, December.
    3. Hyeok-Jin Yun & Ho-Sung Kim & Myoungho Kim & Ju-Won Baek & Hee-Je Kim, 2018. "A DAB Converter with Common-Point-Connected Winding Transformers Suitable for a Single-Phase 5-Level SST System," Energies, MDPI, vol. 11(4), pages 1-16, April.
    4. Ikkurthi Kanaka Durga & S. Srinivasa Rao & Jin-Woo Ahn & Tae-Yong Park & Bak Jin-Soo & Cho-In Ho & K. Prabakar & Hee-Je Kim, 2018. "Dice-Like Nanostructure of a CuS@PbS Composite for High-Performance Supercapacitor Electrode Applications," Energies, MDPI, vol. 11(7), pages 1-11, June.
    5. P. Sathishkumar & Himanshu & Shengxu Piao & Muhammad Adil Khan & Do-Hyun Kim & Min-Soo Kim & Dong-Keun Jeong & Cheewoo Lee & Hee-Je Kim, 2017. "A Blended SPS-ESPS Control DAB-IBDC Converter for a Standalone Solar Power System," Energies, MDPI, vol. 10(9), pages 1-19, September.
    6. Seok-Jin Hong & Seung-Wook Hyun & Kyung-Min Kang & Jung-Hyo Lee & Chung-Yuen Won, 2018. "Improvement of Transient State Response through Feedforward Compensation Method of AC/DC Power Conversion System (PCS) Based on Space Vector Pulse Width Modulation (SVPWM)," Energies, MDPI, vol. 11(6), pages 1-16, June.
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    8. Dong-Keun Jeong & Ho-Sung Kim & Ju-Won Baek & Hee-Je Kim & Jee-Hoon Jung, 2018. "Autonomous Control Strategy of DC Microgrid for Islanding Mode Using Power Line Communication," Energies, MDPI, vol. 11(4), pages 1-22, April.
    9. Dongkwan Yoon & Sungmin Lee & Younghoon Cho, 2020. "Design Considerations of Series-Connected Devices Based LLC Converter," Energies, MDPI, vol. 13(1), pages 1-14, January.
    10. Song Wang & Shuang Wang & Ying Cui & Jie Long & Fuqiang Ren & Shengchang Ji & Shuhong Wang, 2020. "An Experimental Study of the Sweep Frequency Impedance Method on the Winding Deformation of an Onsite Power Transformer," Energies, MDPI, vol. 13(14), pages 1-13, July.
    11. Fei Xiong & Junyong Wu & Liangliang Hao & Zicheng Liu, 2017. "Backflow Power Optimization Control for Dual Active Bridge DC-DC Converters," Energies, MDPI, vol. 10(9), pages 1-27, September.
    12. Wenzheng Xu & Nelson Hon Lung Chan & Siu Wing Or & Siu Lau Ho & Ka Wing Chan, 2017. "A New Control Method for a Bi-Directional Phase-Shift-Controlled DC-DC Converter with an Extended Load Range," Energies, MDPI, vol. 10(10), pages 1-17, October.
    13. Tao Lei & Cenying Wu & Xiaofei Liu, 2018. "Multi-Objective Optimization Control for the Aerospace Dual-Active Bridge Power Converter," Energies, MDPI, vol. 11(5), pages 1-21, May.
    14. Zhijian Fang & Junhua Wang & Shanxu Duan & Jianwei Shao & Guozheng Hu, 2017. "Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range," Energies, MDPI, vol. 10(10), pages 1-21, September.
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