Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
권호 표지
DOI QR코드

DOI QR Code

Non-Isolated High Gain Bidirectional Modular DC-DC Converter with Unipolar and Bipolar Structure for DC Networks Interconnections

  • Sun, Lejia (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Zhuo, Fang (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Wang, Feng (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Yi, Hao (School of Electrical Engineering, Xi'an Jiaotong University)
  • Received : 2017.12.12
  • Accepted : 2018.05.19
  • Published : 2018.09.20
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, a novel high gain bidirectional modular dc-dc converter (BMC) with unipolar and bipolar structures for dc network interconnections is proposed. When compared with traditional dc grid-connecting converters, the proposed converter can achieve a high voltage gain with a simple modular transformerless structure. A sub-modular structure for the BMC is proposed to eliminate the unbalanced current stress between the different power units (levels) in the BMC. This can realize current sharing and standardized production and assembling. In addition, phase-interval operation is introduced to the sub-modules to realize low voltage and current ripple in both sides of the converter. Furthermore, two types of bipolar topologies of the sub-modular BMC were proposed to extend its application in bipolar dc network connections. In addition, the control system was optimized for grid-connection applications by providing various control strategies. Finally, simulations of a 3-level unipolar sub-modular BMC and a 4-level bipolar sub-modular BMC were conducted, and a 1-kW experimental 3-level unipolar prototype was developed to verify the effectiveness of the proposed converter.

Keywords

References

  1. G. J. Kish, and M. Ranjram, "A modular multilevel DC/DC converter with fault blocking capability for HVDC interconnects," IEEE Trans. Power Electron., Vol. 30, No. 1, pp.148-162, Jan. 2015. https://doi.org/10.1109/TPEL.2013.2295967
  2. D. Vinnikov, J. Laugis, and I. Galkin, "Middle-frequency isolation transformer design issues for the high-voltage DC/DC converter," in 2008 Power Electronics Specialists Conference, pp. 1930-1936, 2008.
  3. S. Vighetti and J.-P. Ferrieux "Optimization and design of a cascaded DC/DC converter devoted to grid-connected photovoltaic systems," IEEE Trans. Power Electron., Vol. 27, No. 4, pp. 2018-2027, Apr. 2012. https://doi.org/10.1109/TPEL.2011.2167159
  4. R. Kadri and J.-P. Gaubert, “Nondissipative string current diverter for solving the cascaded DC–DC converter connection problem in photovoltaic power generation system,” IEEE Trans. Power Electron., Vol. 27, No. 3, pp. 1249-1258, Mar. 2012. https://doi.org/10.1109/TPEL.2011.2164268
  5. S. L Undberg, "Wind farm configuration and energy efficiency studies - Series dc versus ac layouts," Ph.D. dissertation, Chalmers University of Technology, Sweden, 2006.
  6. C. Meyer, "Key components f or future offshore dc grids," Ph.D. dissertation, Inst. Power Generation and Storage Systems, R W TH Aachen University, Aachen, Germany, 2007.
  7. Z. Chen, S. Liu, and L. Shi, “A soft switching full bridge converter with reduced parasitic oscillation in a wide load range,” IEEE Trans. Power Electron., Vol. 29, No. 2, pp. 801-812, Feb. 2014. https://doi.org/10.1109/TPEL.2013.2257868
  8. X. Hu, and C. Gong, "A high voltage gain dc-dc converter integrating coupled-inductor and diode-capacitor techniques," IEEE Trans. Power Electron., Vol. 29, No. 2, pp. 789-800, Feb. 2014. https://doi.org/10.1109/TPEL.2013.2257870
  9. F. S. Garcia, J. A. Pomilio, and G. Spiazzi, “Modeling and control design of the interleaved double dual boost converter,” IEEE Trans. Ind. Electron., Vol. 60, No. 8, pp. 1292-1300, Aug. 2013. https://doi.org/10.1109/TED.2013.2248278
  10. K. C. Tseng, C. C. Huang, and W. Y. Shih, “A high step-up converter with a voltage multiplier module for a photovoltaic system,” IEEE Trans. Power Electron., Vol. 28, No. 6, pp. 3047-3057, Jun. 2013. https://doi.org/10.1109/TPEL.2012.2217157
  11. L. Huber and M. M. Jovanovic, "A design approach for server power supplies for networking applications," Proc. IEEE Applied Power Electronics Conf. And Exposition, pp. 1163-1169, 2000.
  12. L. Huber and M. M. Jovanovic, "A design approach for server power supplies for networking applications," Proc. IEEE Applied Power Electronics Conf. And Exposition, pp. 1163-1169, 2000.
  13. M. S. Elmore, "Input current ripple cancellation in synchronized, parallel connected critically continuous boost converters," in Proc. IEEE Appl. Power Electron. Conf., pp. 152-158, 1996.
  14. C. H. Chan and M. H. Pong, "Input current analysis of interleaved boost converters operating in discontinuous-inductor current mode," in IEEE Power Electron. Spec. Conf., pp. 392-398, 1997.
  15. T. Ishii and Y. Mizutani, "Power factor correction using interleaving technique for critical mode switching converters," in IEEE Power Electron. Spec. Conf., pp. 905-910, 1998.
  16. N. Genc and I. Iskender, “DSP-based current sharing of average current controlled two-cell interleaved boost PFC converter,” IET Power Electron., Vol. 4, No. 9, pp. 1015-1022, Nov. 2011. https://doi.org/10.1049/iet-pel.2010.0349
  17. T. Nouri, S. H. Hosseini, E. Babaei, and J. Ebrahimi, “Interleaved high step-up dc-dc converter based on three-winding high-frequency coupled inductor and voltage multiplier cell,” IET Power Electron., Vol. 8, No. 2, pp. 175-189, Feb. 2015. https://doi.org/10.1049/iet-pel.2014.0165
  18. L. Po-Wa, Y. S. Lee, D. K. W. Cheng, and L. Xiu-Cheng, “Steady-state analysis of an interleaved boost converter with coupled inductors,” IEEE Trans. Ind. Electron., Vol. 47, No. 4, pp. 787-795, Aug. 2000. https://doi.org/10.1109/41.857959
  19. Y. Ye, K. W. E. Cheng, and S. Chen, “A high step-up PWM DC-DC converter with coupled-inductor and resonant switched-capacitor,” IEEE Trans. Power Electron., Vol. 32, No. 10, pp. 7739-7749, Nov. 2016. https://doi.org/10.1109/TPEL.2016.2633381
  20. F. H. Khan, L. M. Tolbert, and W. E. Webb, “Start-up and dynamic modeling of the multilevel modular capacitor-clamped converter,” IEEE Trans. Power Electron., Vol. 25, No. 2, pp. 519-531, Feb. 2010. https://doi.org/10.1109/TPEL.2009.2025273
  21. F. H. Khan, L. M. Tolbert, and W. E. Webb, "Hybird electric vehicle power management solutions based on isolated and nonisolated configurations of multilevel modular capacitor-clamped converter," IEEE Trans. Ind. Electron., Vol. 56, No. 8, pp. 3079-3095, May 2009. https://doi.org/10.1109/TIE.2009.2022074
  22. D. Cao, S. Jiang, and F. Z. Peng, “Optimal design of a multilevel modular capacitor-clampled DC-DC converter,” IEEE Trans. Power Electron., Vol. 28, No. 8, pp. 3816-3826, Aug. 2013. https://doi.org/10.1109/TPEL.2012.2231438
  23. F. H. Khan and L. M. Tolbert, “Multiple-load-source integration in a multilevel modular capacitor-clamped DC-DC converter featuring fault tolerant capability,” IEEE Trans. Power Electron., Vol. 24, No. 1, pp. 14-24, Jan. 2009. https://doi.org/10.1109/TPEL.2008.2006055
  24. L. Sun, F. Zhuo, F. Wang, and T. Zhu, "A non-isolated bidirectional soft-switching power-unit-based DC-DC converter with unipolar and bipolar structure for DC networks interconnection," IEEE Trans. Ind. Appl., Vol. 54, No. 3, pp. 2677-2689, Jan. 2018. https://doi.org/10.1109/TIA.2018.2797256