전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제24권4호
  • /
  • Pages.229-236
  • /
  • 2019
  • /
  • 1229-2214(pISSN)
  • /
  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
권호 표지
DOI QR코드

DOI QR Code

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
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

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

JRJJC3_2019_v24n4_229_f0001.png 이미지

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

JRJJC3_2019_v24n4_229_f0002.png 이미지

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

JRJJC3_2019_v24n4_229_f0003.png 이미지

Fig. 4. Voltage balancer operating waveform.

JRJJC3_2019_v24n4_229_f0004.png 이미지

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

JRJJC3_2019_v24n4_229_f0005.png 이미지

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

JRJJC3_2019_v24n4_229_f0006.png 이미지

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

JRJJC3_2019_v24n4_229_f0007.png 이미지

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

JRJJC3_2019_v24n4_229_f0008.png 이미지

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

JRJJC3_2019_v24n4_229_f0009.png 이미지

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

JRJJC3_2019_v24n4_229_f0010.png 이미지

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

JRJJC3_2019_v24n4_229_f0011.png 이미지

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

JRJJC3_2019_v24n4_229_f0012.png 이미지

Fig. 13. Efficiency measurement result of the prototype.

JRJJC3_2019_v24n4_229_f0013.png 이미지

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

TABLE Ⅰ SYSTEM PARAMETERS OF PROPOSED CONVERTER

JRJJC3_2019_v24n4_229_t0001.png 이미지

TABLE Ⅱ SYSTEM PARAMETERS

JRJJC3_2019_v24n4_229_t0002.png 이미지

TABLE Ⅲ DESIGNED INDUCTOR PARAMETERS

JRJJC3_2019_v24n4_229_t0003.png 이미지

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