Analysis of a three phase capacitor voltage balanced hybrid multi-level inverter with a three phase RL-load

  • Authors

    • Omeje Crescent O University of Nigeria, Nsukka
    • Nnadi Damian B
    • Odeh Charles I.
    • Eya Candidus U.
    • Oti Stephen E
    2020-02-07
    https://doi.org/10.14419/ijet.v9i1.29969
  • Capacitor Voltage Balancing, Hybrid Multi-Level Converters, Hysteresis, Redundant Switching States, Simulations, %THD, RL-Load Design and Experimental Set Up.

  • This paper outlined the basic concepts of two selected types of hybrid multi-level inverters that were capacitor voltage-source dependent. A natural capacitor voltage balancing involving hysteresis with redundant switching states was analyzed in this paper. Simulations using MATLAB 7.14 were carried out for an unbalanced and a well-balanced capacitor voltage supply under 0V, 100V and 200V pre-charged capacitor voltage conditions. A comparative analysis of the two types of hybrid multi-level inverters (Type A and Type B) with pertinent to %THD values of [35.77% and 23.79%] for Type A and [92.10% and 84.94%] for type B during fault occurrence were evaluated in this work. These harmonic values can lead to thermal run away and total malfunction of the semi-conductor switches. An experimental vali-dation of Type A hybrid multi-level inverter with a three level flying capacitor input stage and H-bridge output stage using a three phase RL-Load of 15Ω and 45mH was accomplished in the laboratory with results compared with the simulations for experimental verification.

     

     

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    Crescent O, O., Damian B, N., Charles I., O., Candidus U., E., & Stephen E, O. (2020). Analysis of a three phase capacitor voltage balanced hybrid multi-level inverter with a three phase RL-load. International Journal of Engineering & Technology, 9(1), 133-148. https://doi.org/10.14419/ijet.v9i1.29969