An Improved Modified Capacitor-Assisted Z-Source Inverter with Reduced Capacitor Voltage Stress and Inrush Start-up Current

Subhani, Nafis; Kannan, Ramani; Porkumaran, Karantharaj; Prasath, S. Rama; Srinath, Madhavan

doi:10.1109/cencon47160.2019.8974668

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…Furthermore, the inrush current cannot be suppressed in this topology and there is no shared ground between the source and inverter bridge. To resolve these issues by maintaining such high gain, two new modifications [see Figure 15(a) and (b)] are brought out in [74,75]. In [74], by making the entire Z network connection into series, the voltage stress across the capacitors is significantly reduced, and in addition to that, the start-up inrush current is also minimized as compared to the topology in [73].…”

Section: Modified Capacitor-assisted Zsis (Mca-zsis)mentioning

confidence: 99%

“…To resolve these issues by maintaining such high gain, two new modifications [see Figure 15(a) and (b)] are brought out in [74,75]. In [74], by making the entire Z network connection into series, the voltage stress across the capacitors is significantly reduced, and in addition to that, the start-up inrush current is also minimized as compared to the topology in [73]. Another additional advantage is the joint ground sharing which is absent in all modifications of the MCA-ZSI.…”

Section: Modified Capacitor-assisted Zsis (Mca-zsis)mentioning

confidence: 99%

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Z‐source inverter topologies with switched Z‐impedance networks: A review

Subhani

Kannan

Mahmud

et al. 2021

IET Power Electronics

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The Z‐source inverter is one of the most interesting power electronic converters. Over the past decades, research and development have been in high demand to meet the challenges for improving the converter performance with reduced weight and cost while having high efficiency along with high gain or boost factor. Since the inception, tons of resolutions, customizations, and improvements have appeared to achieve these performance goals. To overcome the most common drawback, i.e. the low boost factor of classical Z‐source inverters, the switched inductor/capacitor and switched boost Z‐source inverter topologies have become predominant in the recent epoch. Furthermore, the higher component voltage stress, discontinuous input current, and high inrush start‐up current issues have also been addressed and solved in various literature as part of this topical advancement. In this study, a comprehensive review of various switched impedance network‐based Z‐source inverter topologies has been accomplished for providing a quick report to researchers and engineers so that they can consider this as a one‐stop solution for selecting inverters from this group. The overall study covers the methodology, features, and relevant important results of the latest switched Z‐source inverter models in order to demonstrate the coordination between pitfalls and improvements.

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Section: Modified Capacitor-assisted Zsis (Mca-zsis)mentioning

confidence: 99%

Section: Modified Capacitor-assisted Zsis (Mca-zsis)mentioning

confidence: 99%

Z‐source inverter topologies with switched Z‐impedance networks: A review

Subhani

Kannan

Mahmud

et al. 2021

IET Power Electronics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Numerous techniques have been employed with the Z-source network for improving the efficiency and voltage gain [27][28][29][30][31][32][33][34]. However, the major drawbacks associated with the Z-source converter are the higher starting current, limited voltage gain, higher voltage stress on components, discrete input, etc., which reduce its performance in real-world applications [35][36][37]. Therefore, for better performance in a two-stage power conversion system, the converter must carry the advantages of reduced weight, less cost, semiconductor stress, etc.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Design of High Step-Up Switched Z-Source (HS-SZSC) DC-DC Converter for Grid-Connected Inverters

et al. 2022

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With the increasing trend in the energy demand, power networks are transitioning from conventional generation systems to renewable energy sources (RESs). The energy is harvested from these RESs and fed to grid-connected inverters (GCIs), as the output power of major sources (e.g., solar and fuel cell) is mainly DC. However, owing to the lower output voltage of renewable RESs, power converters play a vital role in two-stage power systems for enhancing its lower value to a higher value. The basic requirement for the GCI is to maintain the constant output voltage for which it is essential to have a constant input voltage. Therefore, high gain and efficient power boost converters are required for a robust and reliable two-stage power system. This paper investigates the performance of an efficient model of a high step-up switched Z-source DC-DC converter (HS-SZSC) for grid-connected 3-phase H-bridge inverter applications. The proposed design achieves high voltage gain and eliminates the problems of circuit complexity by utilizing a smaller number of components, which makes it cost effective and highly efficient. The working principle is discussed in detail. To validate the proposed model, the performance of the conventional Z-source converter (ZSC) and proposed HS-SZSC employed with GCI is analyzed and compared for both normal and transient states through MATLAB simulations. The HS-SZSC with an open- and closed-loop system is tested at different loads (AC), representing varying power factor conditions, and results verify the suitability of the proposed design for grid-connected inverters. Lastly, another model is presented to resolve the issue of grid islanding in GCIs.

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An Improved Modified Capacitor-Assisted Z-Source Inverter with Reduced Capacitor Voltage Stress and Inrush Start-up Current

Cited by 2 publications

References 22 publications

Z‐source inverter topologies with switched Z‐impedance networks: A review

Z‐source inverter topologies with switched Z‐impedance networks: A review

An Efficient Design of High Step-Up Switched Z-Source (HS-SZSC) DC-DC Converter for Grid-Connected Inverters

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