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저압 직류 배전용 양극성 DC-DC 컨버터에 관한 연구

A Study on Bipolar DC-DC Converter for Low Voltage Direct Current Distribution

  • Lee, Jung-Yong (Dept. of Electrical Engineering, Konkuk University) ;
  • Kim, Ho-Sung (Power Conversion and Control Research Center, HVDC Research Division, KERI) ;
  • Cho, Jin-Tae (Smart Power Distribution Lab. Power Distribution ICT Group, KEPCO) ;
  • Kim, Ju-Yong (Smart Power Distribution Lab. Power Distribution ICT Group, KEPCO) ;
  • Cho, Younghoon (Dept. of Electrical Engineering, Konkuk University)
  • 투고 : 2018.09.22
  • 심사 : 2018.11.05
  • 발행 : 2019.08.20

초록

This study proposes a DC-DC converter topology of solid-state transformer for low-voltage DC distribution. The proposed topology consists of a voltage balancer and bipolar DC-DC converter. The voltage and current equations are obtained on the basis of switching states to design the controller. The open-loop gain of the controller is achieved using the derived voltage and current equations. The controller gain is selected through the frequency analysis of the loop gain. The inductance and capacitance are calculated considering the voltage and current ripples. The prototype is fabricated in accordance with the designed system parameters. The proposed topology and designed controller are verified through simulation and experiment.

키워드

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Fig. 2. Configuration of LVDC (a) Unipolar, (b) Bipolar.

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Fig. 3. Proposed bipolar DC-DC converter topology.

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Fig. 4. Voltage balancer operating waveform.

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Fig. 5. Current path of voltage balancer (a) Mode 1, (b) Mode 2.

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Fig. 6. Proposed bipolar DC-DC converter topology.

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Fig. 7. Control strategy (a) for voltage balancer, (b) for bipolar DC-DC converter.

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Fig. 8. The output waveform of voltage balancer in unbalance load condition.

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Fig. 9. The simulation results of LVDC DC-DC converter (a) Under balance load condition, (b) Under unbalance load condition.

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Fig. 10. The LVDC bipolar DC-DC converter prototype.

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Fig. 11. Experimental results under 9kW balance load condition.

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Fig. 12. Experimental results under 4.5kW unbalance load condition.

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Fig. 13. Efficiency measurement result of the prototype.

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Fig. 1. Configuration of solid state transformer for LVDC.

TABLE Ⅰ SYSTEM PARAMETERS OF PROPOSED CONVERTER

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TABLE Ⅱ SYSTEM PARAMETERS

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TABLE Ⅲ DESIGNED INDUCTOR PARAMETERS

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참고문헌

  1. D. K. Jeong, H. S. Kim, J. W. Baek, J. T. Cho, and H. J. Kim, "A simplified voltage balancing method applied to multi-level H-bridge converter for solid state transformer," The Transactions of Korean Institute of Power Electronics, Vol. 22, No. 2, pp. 95-101, Apr. 2017. https://doi.org/10.6113/TKPE.2017.22.2.95
  2. H. Kakigano, Y. Miura, and T. Ise, “Lowvoltage bipolar-type DC microgrid for super high quality distribution,” IEEE Transactions on Power Electronics, Vol. 25, No. 12, pp. 3066-3075, 2010. https://doi.org/10.1109/TPEL.2010.2077682
  3. T. Zhao, et al., “Voltage and power balance control for a cascaded H-bridge converter-based solid-state transformer,” IEEE Transactions on Power Electronics, Vol. 28, No. 4, pp. 1523-1532, 2013. https://doi.org/10.1109/TPEL.2012.2216549
  4. J. Shi, et al., “Research on voltage and power balance control for cascaded modular solid-state transformer,” IEEE Transactions on Power Electronics, Vol. 26, No. 4, pp. 1154-1166, 2011. https://doi.org/10.1109/TPEL.2011.2106803
  5. W. Tang and R. H. Lasseter, "An LVDC industrial power distribution system without central control unit," in 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings, pp. 979-984, 2000.
  6. P. Salonen, et al., "LVDC distribution system protection - Solutions, implementation and measurements," in 2009 13th European Conference on Power Electronics and Applications, 2009.
  7. F. Wang, et al., “Topology deduction and analysis of voltage balancers for DC microgrid,” IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 5, No. 2, pp. 672-680, 2017. https://doi.org/10.1109/JESTPE.2016.2638959
  8. X. Zhang and C. Gong, “Dual-buck half-bridge voltage balancer,” IEEE Transactions on Industrial Electronics, Vol. 60, No. 8, pp. 3157-3164, 2013. https://doi.org/10.1109/TIE.2012.2202363
  9. K. F. Chan, et al., "Generalized type III controller design interface for DC-DC converters," in TENCON 2015 - 2015 IEEE Region 10 Conference, Nov. 2015.
  10. B. M. Han, "A half-bridge voltage balancer with new controller for bipolar DC distribution systems," Energies, Vol. 9, No 3, pp. 182, 2016. https://doi.org/10.3390/en9030182