Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Two Modified Z-Source Inverter Topologies - Solutions to Start-Up Dc-Link Voltage Overshoot and Source Current Ripple

  • Bharatkumar, Dave Heema (Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science) ;
  • Singh, Dheerendra (Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science) ;
  • Bansal, Hari Om (Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science)
  • Received : 2018.11.26
  • Accepted : 2019.06.11
  • Published : 2019.11.20
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Abstract

This paper proposes two modified Z-source inverter topologies, namely an embedded L-Z-source inverter (EL-ZSI) and a coupled inductor L-Z source inverter (CL-ZSI). The proposed topologies offer a high voltage gain with a reduced passive component count and reduction in source current ripple when compared to conventional ZSI topologies. Additionally, they prevent overshoot in the dc-link voltage by suppressing heavy inrush currents. This feature reduces the transition time to reach the peak value of the dc-link voltage, and reduces the risk of component failure and overrating due to the inrush current. EL-ZSI and CL-ZSI possess all of the inherent advantages of the conventional L-ZSI topology while eliminating its drawbacks. To verify the effectiveness of the proposed topologies, MATLAB/Simulink models and scaled down laboratory prototypes were constructed. Experiments were performed at a low shoot through duty ratio of 0.1 and a modulation index as high as 0.9 to obtain a peak dc-link voltage of 53 V. This paper demonstrates the superiority of the proposed topologies over conventional ZSI topologies through a detailed comparative analysis. Moreover, experimental results verify that the proposed topologies would be advantageous for renewable energy source applications since they provide voltage gain enhancement, inrush current, dc-link voltage overshoot suppression and a reduction of the peak to peak source current ripple.

Keywords

References

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