Journal of Power Electronics

  • 제18권6호
  • /
  • Pages.1879-1888
  • /
  • 2018
  • /
  • 1598-2092(pISSN)
  • /
  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
권호 표지
DOI QR코드

DOI QR Code

Complex Vector Modeling and Series Decoupling Current Control Strategy of High-Power L/LCL Type Grid-Connected Converter Under Low Switching Frequency

  • Wang, Yingjie (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Jiao, Lanyi (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Yang, Bo (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Wang, Wenchao (Huizhou Power Supply Bureau) ;
  • Liu, Haiyuan (School of Information and Control Engineering, China University of Mining and Technology)
  • 투고 : 2018.03.05
  • 심사 : 2018.08.29
  • 발행 : 2018.11.20
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

With power level of grid-connected converters rising, the switching frequency of the switching devices is commonly greatly reduced to improve its power capacity. However, this results in serious couplings of the dq current components, which leads to degradation of the static and dynamic performances of grid-connected converters and fluctuations of the reactive power in dynamic processes. In this paper, complex vector models under low switching frequency are established for an L/LCL grid-connected converter, and the relationship between the switching frequency and the coupling degree is analyzed. In addition, a series decoupling current control strategy is put forward. It is shown that the proposed control strategy can eliminate the couplings, improve the performances and have good robustness to parameter variations through static and dynamic characteristics analyses and a sensitivity analysis. Experimental and simulation results also verify the correctness of the theoretical analyses and the superiority of the proposed control strategy.

키워드

참고문헌

  1. L. G. Franquelo, J. I. Leon, and E. Dominguez, "New trends and topologies for high power industrial applications: The multilevel converters solution," International Conference on Power Engineering, Energy and Electrical Drives, pp. 1-6, 2009.
  2. K. Ma and F. Blaabjerg, “Thermal optimised modulation methods of three-level neutral-point-clamped inverter for 10 MW wind turbines under low-voltage ride through,” IET Power Electron., Vol. 5, No. 6, pp. 920-927, Jul. 2012. https://doi.org/10.1049/iet-pel.2011.0446
  3. J. A. Pontt, J. R. Rodriguez, A. Liendo, P. Newman, J. Holtz, and J. M. S. Martin, “Network-friendly lowswitching-frequency multipulse high-power three- level PWM rectifier,” IEEE Trans. Ind. Electron., Vol. 56, No. 4, pp. 1254-1262, Apr. 2009. https://doi.org/10.1109/TIE.2008.2007998
  4. J. Holtz and X. Qi, "Optimal control of medium-voltage drives - An overview," IEEE Trans. Ind. Electron., Vol. 60, No. 12, pp. 5472-5481, Dec. 2013. https://doi.org/10.1109/TIE.2012.2230594
  5. A. G. Siemens, "Power semiconductors: For medium voltage converters - An overview," European Conference on Power Electronics and Applications, pp. 121-134, 2009.
  6. H. Kim, M. W. Degner, J. M. Guerrero, F. Briz, and R. D. Lorenz, “Discrete-time current regulator design for AC machine drives,” IEEE Trans. Ind. Appl., Vol. 46, No. 4, pp. 1425-1435, Jul./Aug. 2010. https://doi.org/10.1109/TIA.2010.2049628
  7. J. Holtz, J. Quan, J. Pontt, and J. Rodriguez, “Design of fast and robust current regulators for high-power drives based on complex state variables,” IEEE Trans. Ind. Appl., Vol. 40, No. 5, pp. 1388-1397, Sep./Oct. 2004. https://doi.org/10.1109/TIA.2004.834049
  8. J. S. Yim, S. K. Sul, B. H. Bae, N. R. Patel, and S. Hiti, “Modified current control schemes for high-performance permanent-magnet ac drives with low sampling to operating frequency ratio,” IEEE Trans. Ind. Appl., Vol. 45, No. 2, pp. 763-771, Mar./Apr. 2009. https://doi.org/10.1109/TIA.2009.2013600
  9. M. Ke, M. Liserre, and F. Blaabjerg, “Operating and loading conditions of a three-level neutral-point-clamped wind power converter under various grid faults,” IEEE Trans. Ind. Appl., Vol. 50, No. 1, pp. 520-530, Jan./Feb. 2014. https://doi.org/10.1109/TIA.2013.2269894
  10. A. G. Yepes, A. Vidal, J. Malvar, O. Lopez, and J. Doval- Gandoy, “Tuning method aimed at optimized settling time and overshoot for synchronous proportional-integral current control in electric machines,” IEEE Trans. Power Electron., Vol. 29, No. 6, pp. 3041-3054, Jun. 2014. https://doi.org/10.1109/TPEL.2013.2276059
  11. D. G. Holmes, T. A. Lipo, B. P. Mcgrath, and W. Y. Kong, “Optimized design of stationary frame three phase AC current regulators,” IEEE Trans. Power Electron., Vol. 24, No. 11, pp. 2417-2426, Nov. 2009. https://doi.org/10.1109/TPEL.2009.2029548
  12. F. D. Freijedo, A. Vidal, A. G. Yepes, J. M. Guerrero, O. Lopez, J. Malvar, and J. Doval-Gandoy, "Tuning of synchronous-frame PI current controllers in grid-connected converters operating at a low sampling rate by mimo root locus," IEEE Trans. Ind. Electron., Vol. 62, No. 8, pp. 5006-5017, Aug. 2015. https://doi.org/10.1109/TIE.2015.2402114
  13. K. Tan, Q. Ge, Z. Yin, L. Tan, C. Liu, and Y Li, "The optimized strategy for input current harmonic of low switching frequency PWM rectifier," 2010 5th IEEE Conference on Industrial Electronics and Applications, pp. 1057-1061, 2010.
  14. A. Ghoshal and V. John, “Active damping of LCL filter at low switching to resonance frequency ratio,” IET Power Electron., Vol. 8, No. 4, pp. 574-582, Apr. 2015. https://doi.org/10.1049/iet-pel.2014.0355
  15. J. G. Hwang, P. W. Lehn, and M. Winkelnkemper, “A generalized class of stationary frame-current controllers for grid-connected AC-DC converters,” IEEE Trans. Power Del., Vol. 25, No. 4, pp. 2742-2751, Oct. 2010. https://doi.org/10.1109/TPWRD.2010.2045136
  16. S. Kouro, P. Cortes, R. Vargas, U. Ammann, and J. Rodriguez, "Model predictive control - A simple and powerful method to control power converters," IEEE Trans. Ind. Electron., Vol. 56, No. 6, pp. 1826-1838, Jun. 2009. https://doi.org/10.1109/TIE.2008.2008349
  17. Y. Wang, W. Wang, C. Wang, and X. Wu, “Coupling analysis on current control at low switching frequency for the three-phase PWM converter based on RGA and a novel output feedback decoupling method,” IEEE Trans. Ind. Electron., Vol. 63, No. 11, pp. 6684-6694, Nov. 2016. https://doi.org/10.1109/TIE.2016.2582474
  18. S. A. Khajehoddin, M. Karimi-Ghartemani, P. K. Jain, and A. Bakhshai, “A control design approach for three-phase grid-connected renewable energy resources,” IEEE Trans. Sustain. Energy, Vol. 2, No. 4, pp. 423- 432, Oct. 2011. https://doi.org/10.1109/TSTE.2011.2158457
  19. W. Lyon, Transient Analysis of Alternating-current Machinery, Wiley, 1954.
  20. J. Holtz, “The representation of AC machine dynamics by complex signal flow graphs,” IEEE Trans. Ind. Electron., Vol. 42, No. 3, pp. 263-271, Jun. 1995. https://doi.org/10.1109/41.382137
  21. K. Dai, P. Liu, J. Xiong, and J. Chen, "Comparative study on current control for three-phase SVPWM voltage-source converter in synchronous rotating frame using complex vector method," IEEE Power Electronics Specialist Conference, Vol. 2, pp. 695-700, 2003.
  22. J. Holtz and N. Oikonomou, “Estimation of the fundamental current in low-switching-frequency high dynamic medium-voltage drives,” IEEE Trans. Ind. Appl., Vol. 44, No. 5, pp. 1597-1605, Sep./Oct. 2008. https://doi.org/10.1109/TIA.2008.2002212
  23. J. S. Yim, S. K. Sul, B. H. Bae, N. R. Patel, and S. Hiti, “Modified current control schemes for high-performance permanent-magnet AC drives with low sampling to operating frequency ratio,” IEEE Trans. Ind. Appl., Vol. 45, No. 2, pp. 763-771, Mar./Apr. 2009. https://doi.org/10.1109/TIA.2009.2013600
  24. D. G. Holmes, T. A. Lipo, B. P. McGrath, and W. Y. Kong, “Optimized design of stationary frame three phase AC current regulators,” IEEE Trans. Power Electron., Vol. 24, No. 11, pp. 2417-2426, Nov. 2009. https://doi.org/10.1109/TPEL.2009.2029548