Your browser does not support JavaScript!

access icon openaccess Pulse delay control for capacitor voltage balancing in a three-level boost neutral point clamped inverter

The cross regulation effect in multi-output DC/DC converters offers a reliable support for the grid integration of multilevel inverters by balancing the capacitor voltages. The capacitor voltage balancing by single input dual output boost converter is often realised by conventional three-level switching scheme. The three-level operation benefits lower inductor ripple current, but it limits the maximum possible compensation voltages. In this study, the entire operating modes of the boost converter is presented and all the possible cases which contribute to the voltage balancing are employed for balancing the capacitor voltages in a three-level neutral point clamped inverter. A proportional-integral controller based duty ratio control and pulse delay control are used for DC link voltage regulation and capacitor voltage balancing. Since the classical state-space averaging technique is not suitable for SIDO converters, inductor current ripple averaging technique is utilised for controller design. The circuit simulation is performed in Matlab/Simulink. The digital controller is realised using the Virtex-5FPGA in Labview/CompactRIO module. Both simulation and experimental results are presented to validate the controller performance.


    1. 1)
    2. 2)
      • 27. Soman, D.E., Vikram, K., Krishna, R., Gabrysch, M., Kottayil, S.K., Leijon, M.: ‘Analysis of three-level buck boost converter operation for improved renewable energy conversion and smart grid integration’. IEEE Int. Energy Conf. and Exhibition (ENERGYCON), May 2014, accepted.
    3. 3)
    4. 4)
    5. 5)
    6. 6)
    7. 7)
    8. 8)
    9. 9)
    10. 10)
    11. 11)
    12. 12)
      • 17. Yao, G., Ma, M., Deng, Y., Li, W., He, X.: ‘An improved ZVT PWM three level boost converter for power factor preregulator’. Proc. IEEE PESC, June 2007, pp. 768772.
    13. 13)
    14. 14)
    15. 15)
    16. 16)
      • 23. Vitoi Lais, A., Krishna, R., Soman, D.E., Leijon, M., Kottayil, S.K.: ‘Control and implementation of three level boost converter for load voltage regulation’. IECON 2013–39th Annual Conf. of the IEEE Industrial Electronics Society, 10–13 November 2013, pp. 561565.
    17. 17)
      • 21. Yaramasu, V., Wu, B.: ‘Three-level boost converter based medium voltage megawatt pmsg wind energy conversion systems’. Third IEEE Energy Conversion Congress and Exposition (ECCE), September, 2011, pp. 561567.
    18. 18)
      • 26. Holmes, D.G., Lipo, T.A.: ‘Pulse width modulation for power converters principles and practice’. IEEE Series on Power Engineering, 2003.
    19. 19)
    20. 20)
    21. 21)
    22. 22)
    23. 23)
      • 18. Zhang, M.T., Jiang, Y., Lee, F.C., Jovanovic, M.M.: ‘Single-phase three-level boost power factor correction converter’. Proc. IEEE APEC ‘95 Conf., 1995, vol. 1, pp. 434439.
    24. 24)
    25. 25)
      • 19. Pinheiro, J.R., Vidor, D.L.R., Grundling, H.A.: ‘Dual output three-level boost power factor correction converter with unbalanced loads’. Conf. Rec. IEEE PESC', 1996, vol. 96, pp. 733739.
    26. 26)
    27. 27)

Related content

This is a required field
Please enter a valid email address