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Fundamental Output Voltage Enhancement of Half-Bridge Voltage Source Inverter with Low DC-link Capacitance

  • Elserougi, Ahmed (Department of Electrical Engineering, Qatar University) ;
  • Massoud, Ahmed (Department of Electrical Engineering, Qatar University) ;
  • Ahmed, Shehab (Department of Electrical and Computer Engineering, Texas A&M University at Qatar)
  • Received : 2017.04.17
  • Accepted : 2017.08.16
  • Published : 2018.01.20

Abstract

Conventionally, in order to reduce the ac components of the dc-link capacitors of the two-level Half-Bridge Voltage Source Inverter (HB-VSI), high dc-link capacitances are required. This necessitates the employment of short-lifetime and bulky electrolytic capacitors. In this paper, an analysis for the performance of low dc-link capacitances-based HB-VSI is presented to elucidate its ability to generate an enhanced fundamental output voltage magnitude without increasing the voltage rating of the involved switches. This feature is constrained by the load displacement factor. The introduced enhancement is due to the ac components of the capacitors' voltages. The presented approach can be employed for multi-phase systems through using multi single-phase HB-VSI(s). Mathematical analysis of the proposed approach is presented in this paper. To ensure a successful operation of the proposed approach, a closed loop current controller is examined. An expression for the critical dc-link capacitance, which is the lowest dc-link capacitance that can be employed for unipolar capacitors' voltages, is derived. Finally, simulation and experimental results are presented to validate the proposed claims.

Keywords

References

  1. S. B. Kjaer, J. K. Pedersen, and F. Blaabjerg, “A review of single-phase grid-connected inverters for photovoltaic modules,” IEEE Trans. Ind. Appl., Vol. 41, No. 5, pp. 1292-1306, Sep./Oct. 2005. https://doi.org/10.1109/TIA.2005.853371
  2. M. Meinhardt and G. Cramer, "Multi-string-converter: The next step in evolution of string-converter technology," in Proceedings of 9th European Power Electronics and Applications Conference, 2001.
  3. W. Li, Y. Gu, H. Luo, W. Cui, X. He, and C. Xia, “Topology review and derivation methodology of single-phase transformerless photovoltaic inverters for leakage current suppression,” IEEE Trans. Ind. Electron., Vol. 62, No. 7, pp. 4537-4551, Jul. 2015. https://doi.org/10.1109/TIE.2015.2399278
  4. H. Patel and V. Agarwal, “A single-stage single-phase transformer-less doubly grounded grid-connected PV interface,” IEEE Trans. Energy Convers., Vol. 24, No. 1, pp. 93-101, Mar. 2009. https://doi.org/10.1109/TEC.2008.2006551
  5. Y. Baba, M. Okamoto, E. Hiraki, and T. Tanaka, "A half- bridge inverter based current balancer with the reduced DC capacitors in single-phase three-wire distribution feeders," in IEEE Energy Conversion Congress and Exposition (ECCE), pp. 4233-7239, Sep. 2011.
  6. T. Tanaka, T. Sekiya, Y. Baba, M. Okamoto, and E. Hiraki "A new half-bridge based inverter with the reduced- capacity DC capacitors for DC micro-grid," in IEEE Energy Conversion Congress and Exposition(ECCE), pp.2564-2569, Sep. 2010.
  7. B. K. Bose, Modern power electronics and AC drives, Prentice Hall Publishers, pp. 214-215, 2001.
  8. G. Zhang, Z. Li, B. Zhang, D. Qiu, W. Xiao, and W. A. Halang, "A Z-source half-bridge converter," IEEE Trans. Ind. Electron., Vol. 61, No. 3, pp. 1269-1279, Mar. 2014. https://doi.org/10.1109/TIE.2013.2257146
  9. T. Kerekes, R. Teodorescu, M. Liserre, C. Klumpner, and M. Sumner, “Evaluation of three-phase transformerless photovoltaic inverter topologies,” IEEE Trans. Power Electron., Vol. 24, No. 9, pp. 2202–2211, Sep. 2009. https://doi.org/10.1109/TPEL.2009.2020800
  10. F. Z. Peng, “Z-source inverter,” IEEE Trans. Ind. Appl., Vol. 39, No. 2, pp. 504-510, Mar./Apr. 2003. https://doi.org/10.1109/TIA.2003.808920
  11. E. Babaei and E. S. Asl, “High voltage gain half-bridge z-source inverter with low voltage stress on capacitors,” IEEE Trans. Ind. Electron., Vol. 64, No. 1, pp. 191-197, Jan. 2017. https://doi.org/10.1109/TIE.2016.2599146
  12. R. Wang, J. Zhao, and Y. Liu, "DC-link capacitor voltage fluctuation analysis of four-switch three-phase inverter," in 37th Annual Conference on IEEE Industrial Electronics Society (IECON), pp. 1276-1281, Nov. 2011.
  13. M. S. Diab, A. Elserougi, A. M. Massoud, A. S. Abdel-Khalik, and S. Ahmed, “A four-switch three-phase SEPIC-based inverter,” IEEE Trans. Power Electron., Vol. 30, No. 9, pp. 4891-4905, Sep. 2015. https://doi.org/10.1109/TPEL.2014.2363853
  14. H. Hu, S. Harb, N. H. Kutkut, Z. J. Shen, and I. Batarseh, “A single-stage microinverter without using electrolytic capacitors,” IEEE Trans. Power Electron., Vol. 28, No. 6, pp. 2677-2687, Jun. 2013. https://doi.org/10.1109/TPEL.2012.2224886
  15. J. Both, “The modern era of aluminum electrolytic capacitors,” IEEE Elect. Insul. Mag., Vol. 31, No. 4, pp. 24-34, Jul./Aug. 2015. https://doi.org/10.1109/MEI.2015.7126071
  16. A. Fratta and F. Scapino, "Modeling inverter losses for circuit simulation," in IEEE 35th Annual Power Electronics Specialists Conference (PESC), pp.4479-4485, Jun. 2004.
  17. F. Zare, "EMI issues in modern power electronic systems," The IEEE EMC Society Newsletter, No. 221, pp. 66-70, 2009.