Two Modified Z-Source Inverter Topologies - Solutions to Start-Up Dc-Link Voltage Overshoot and Source Current Ripple

Dave Heema Bharatkumar; Dheerendra Singh; Hari Om Bansal

Two Modified Z-Source Inverter Topologies - Solutions to Start-Up Dc-Link Voltage Overshoot and Source Current Ripple

Dave Heema Bharatkumar

Dheerendra Singh

Hari Om Bansal

Vol. 19, No. 6, pp. 1351-1365, Nov. 2019

10.6113/JPE.2019.19.6.1351

Coupled inductor

Current ripple

Split voltage sources

Voltage gain

Voltage overshoot

Z-source inverter

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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.

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Cite this article

[IEEE Style]

D. H. Bharatkumar, D. Singh, H. O. Bansal, "Two Modified Z-Source Inverter Topologies - Solutions to Start-Up Dc-Link Voltage Overshoot and Source Current Ripple," Journal of Power Electronics, vol. 19, no. 6, pp. 1351-1365, 2019. DOI: 10.6113/JPE.2019.19.6.1351.

[ACM Style]

Dave Heema Bharatkumar, Dheerendra Singh, and Hari Om Bansal. 2019. Two Modified Z-Source Inverter Topologies - Solutions to Start-Up Dc-Link Voltage Overshoot and Source Current Ripple. Journal of Power Electronics, 19, 6, (2019), 1351-1365. DOI: 10.6113/JPE.2019.19.6.1351.