Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Theoretical Analysis and Control of DC Neutral-point Voltage Balance of Three-level Inverters in Active Power Filters

  • He, Yingjie (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Liu, Jinjun (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Tang, Jian (School of Electrical and Electronic Engineering, Huazhong University of Science & Technology) ;
  • Wang, Zhaoan (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Zou, Yunping (School of Electrical and Electronic Engineering, Huazhong University of Science & Technology)
  • Received : 2011.05.10
  • Published : 2012.03.20
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Abstract

In recent years, multilevel technology has become an effective and practical solution in the field of moderate and high voltage applications. This paper discusses an APF with a three-level NPC inverter. Obviously, the application of such converter to APFs is hindered by the problem of the voltage unbalance of DC capacitors, which leads to system instability. This paper comprehensively analyzes the theoretical limitations of the neutral-point voltage balancing problem for tracking different harmonic currents utilizing current switching functions from the space vector PWM (SVPWM) point of view. The fluctuation of the neutral point caused by the load currents of certain order harmonic frequency is reported and quantified. Furthermore, this paper presents a close-loop digital control algorithm of the DC voltage for this APF. A PI controller regulates the DC voltage in the outer-loop controller. In the current-loop controller, this paper proposes a simple neutral-point voltage control method. The neutral-point voltage imbalance is restrained by selecting small vectors that will move the neutral-point voltage in the direction opposite the direction of the unbalance. The experiment results illustrate that the performance of the proposed approach is satisfactory.

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References

  1. D. Rivas, L. Moran, J. W. Dixon, J. Espinoza, "Improving passive filter compensation performance with active techniques," IEEE Trans. Ind. Electron., Vol. 50, No. 1, pp. 161-170, 2003. https://doi.org/10.1109/TIE.2002.807658
  2. S. Srianthumrong, H. Akagi, "A DC module for transient analysis of a series active filter integrated with a double-series diode rectifier," IEEE Trans. Ind. Appl., Vol. 39 No. 3, pp. 864-873, May/Jun. 2003.
  3. T. Jin, K. M. Smedley, "Operation of one-cycle controlled three-phase active power filter with unbalanced source and load," IEEE Trans. Power Electron., Vol. 21, No. 5, pp. 1403-1412, Sep. 2006. https://doi.org/10.1109/TPEL.2006.880264
  4. N. Akira, I. Takahashi, H. Akagi, "A new neutral-point-clamped PWM inverter," IEEE Trans. Ind. Appl., Vol. 17, No. 3, pp. 518-523, Sep. 1981, https://doi.org/10.1109/TIA.1981.4503992
  5. J. Rodriguez, J. S. Lai , F. Z. Peng, "Multilevel inverters: a survey of topologies, controls, and applications," IEEE Trans. Ind. Appl., Vol. 49, No. 4, pp. 724-738, Aug. 2002.
  6. H. Akagi, "A transformerless hybrid active filter for integration into a medium-voltage motor drive with a passive front end," Proceedings of the 2007 IEEE ICPE, pp. 1-8, 2007.
  7. W. Tangtheerajaroonwong, T. Hatada, H. Akagi, "A transformerless hybrid active filter using a three-level diode-clamped pwm converter," Proceedings of the 2007 IEEE PCC, pp. 667-673, 2007.
  8. H. Akagi and R. Kondo, "A transformerless hybrid active filter using a three-level PWM converter for a medium-voltage motor drive," Proceedings of the 2009 IEEE ECCE, pp. 1732-1739, 2009.
  9. H. Akagi and T. Hatada, "Voltage balancing control for a three-level diode-clamped converter in a medium-voltage transformerless hybrid active filter," IEEE Trans. Power Electron., Vol. 24, No. 3, pp. 571-579, Mar. 2009. https://doi.org/10.1109/TPEL.2009.2012528
  10. H. Rudnick, J. Dixon, and L. Moran, "Delivering clean and pure power," IEEE Power and Energy Magazine, Vol. 1, No. 5, pp. 32-40, 2003. https://doi.org/10.1109/MPAE.2003.1231689
  11. M. C. Wong, J. Tang, and Y. D. Han, "Cylindrical coordinate control of 3-D PWM technology in 3-phase 4-wire tri-level inverter," IEEE Trans. Power Electron., Vol. 18 , No. 1, pp. 208 -220, 2003. https://doi.org/10.1109/TPEL.2002.807133
  12. N. Y. Dai, M. C. Wong, and Y. D. Han, "Application of a three-level NPC inverter as a three-phase four-wire power quality compensator by generalized 3DSVM.," IEEE Trans. Power Electron., Vol. 21, No. 2, pp. 440-449, Mar. 2006. https://doi.org/10.1109/TPEL.2005.869755
  13. L. M. Tolbert, F. Z. Peng, and T. G. Habetler, "A multilevel converter-based universal power conditioner," IEEE Trans. Ind. Appl., Vol. 36, No. 2, pp. 596-603, Mar./Apr. 2000. https://doi.org/10.1109/28.833778
  14. M. Postan and A. R. Beig, "A three phase active filter based on three level diode clamp inverter," Proceedings of the 2008 IEEE POWERCON, pp. 1-8, 2008.
  15. E. I. Gutierrez and J. L. Duran-Gomez, "Power quality improvement of a current-pulsed power supply based on a three-level NPC PWM VSI scheme as an active power filter[C]," Proceedings of the 2006 IEEE IPEC, 2006.
  16. M. Basu, S. P. Das, G. Dubey, "Parallel converter scheme for high-power active power filters[J]," IEE Proceedings Electric Power Applications，Vol. 151, No. 4, pp. 460-466, 2004. https://doi.org/10.1049/ip-epa:20040211
  17. H. Akagi, H. Fujita, S. Yonetani, and Y. Kondo, "A 6.6-kv transformerless statcom based on a five-level diode-clamped pwm converter: system design and experimentation of a 200-v 10-kva laboratory model," IEEE Trans. Ind. Appl., Vol. 44, No. 2, pp. 672-680, Mar./Apr. 2008. https://doi.org/10.1109/TIA.2008.916713
  18. N. Celanovic and D. Voroyevich, "A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters," IEEE Trans. Power Electron., Vol. 15, No. 2, pp. 242-249, Mar. 2000. https://doi.org/10.1109/63.838096
  19. L. Lin, Y. P. Zou, Z. Wang, and J. Hongyuan, "Modeling and control of neutral-point voltage balancing problem in three-level NPC PWM Inverters," Proceedings of the 2005 IEEE PESC, pp. 861-866, 2005.
  20. C. J. Zhan, M. C. Wong, Y. Han, "Universal custom power conditioner(UCPC) in distribution networks," Proceedings of the 1999 IEEE PEDS, pp. 1025-1029, 1999.
  21. K. Zhang, Y. Kang, and J. Xiong, and C. Jian, "Control of PWM inverter with repetitive disturbance prediction," Proceedings of the 1999 IEEE APEC, pp. 1026-1031, 1999.
  22. S. G. Luo and Z. C. Hou, "An adaptive detecting method for harmonic and reactive currents," IEEE Trans Industrial Electronics, Vol. 42, No. 1, pp. 85-89, Feb. 1995. https://doi.org/10.1109/41.345850

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