Sigma‐Z‐source inverters

Soon, Jing Jun; Low, Kay Soon

doi:10.1049/iet-pel.2014.0274

Cited by 50 publications

(37 citation statements)

References 32 publications

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“…Use of ISNs as the main factor of classification is not a benefit due to their spreading high variety. For example, two novel passive ISNs have been proposed recently: L-Z-source [74] and sigma-Z-source [75]. Also, active ISNs are becoming popular [76], [77].…”

Section: A Classification Of Impedance-source Galvanically Isolated mentioning

confidence: 99%

A Review of Galvanically Isolated Impedance-Source DC–DC Converters

Chub

Vinnikov

Blaabjerg

et al. 2016

IEEE Trans. Power Electron.

204

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Impedance-source converters, an emerging technology in electric energy conversion, overcome limitations of conventional solutions by use of specific impedance-source networks. Focus in this paper is on the topologies of galvanically isolated impedance-source DC-DC converters. These converters are particularly appropriate for distributed generation systems with renewable or alternative energy sources which require input voltage and load regulation in a wide range. We review here the basic topologies for researchers and engineers and classify all the topologies of the impedance-source galvanically isolated DC-DC converters according to the element that transfers energy from the input to the output: a transformer, a coupled inductor, or their combination. This classification reveals advantages and disadvantages as well as a wide space for further research. The paper also outlines the most promising research directions in this field.

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Section: A Classification Of Impedance-source Galvanically Isolated mentioning

confidence: 99%

A Review of Galvanically Isolated Impedance-Source DC–DC Converters

Chub

Vinnikov

Blaabjerg

et al. 2016

IEEE Trans. Power Electron.

204

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“…During shoot-through state the inductance of winding N 1 is effective, whereas in non-shoot through state both the windings N 1 and N 2 are effective [39]- [41]. By designing this topology, amplitude of the bus voltage can be significantly stepped up and the boost inversion ability of the whole inverter can be significantly improved by 16.5% compared to QZSI. Inheriting the shoot-through time interval of the traditional ZSI the reliability of the whole inverter can be improved.…”

Section: Tapped-inductor Quasi-z-source Inverter (Tl-qzsi)mentioning

confidence: 99%

Quasi-Z-Source Inverter Topologies with Reduced Device Rating: a Review

Rajan¹,

Premalatha²

2017

IJPEDS

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Quasi-Z-Source Inverter (QZSI) has introduced a new wave of interest in engineering industry and research. Reduction in device rating has been the main objective in introducing QZSI topologies. The introduced topologies in QZSI have proven to be feasible in a wide range for high power with medium voltage applications. This paper mainly focuses on QZSI topologies with continuous input current conduction and also power conditioning in the renewable energy system. Based on a detailed comparison of these topologies suitable QZSI can be arrived for a given application. Keyword:Continuous input current Quasi Z-Source inverter Reduced device rating Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Premalatha L., School of Electrical Engineering, VIT University, Chennai -600 027, India. Email: premalatha.l@vit.ac.in INTRODUCTIONQuasi-Z-Source Inverter (QZSI) is derived from the original Z-Source Inverter (ZSI) where it can be utilized to all power converters i.e., DC-AC, DC-DC, AC-DC, AC-AC. ZSI can operate in boost inverter or buck inverter but not as buck-boost inverter [1]- [3].By introducing QZSI some of the disadvantages in traditional ZSI can be overcome. The QZSI has the wide range of applicability in the renewable energy system, where it gives a single stage power conversion with buck-boost characteristics and improve the reliability of the inverter [4]- [8]. In shoot through states, both power switches in a leg are turned on at the same time and it is used to step up the voltage and the output voltage in QZSI can be boost to designed value. Research based on these QZSI has concentrated on modelling and control, photovoltaic and other electrical applications. The QZSI can buck and boost the input voltage in single stage with two control variables; shoot through and modulation index. New topologies of QZSI which has been derived from original ZSI can be proposed for PV applications, because of continuous input current and reduced capacitor rating. QZSI has a prescribed application to combine with renewable energy system for a wide voltage range to distribute for power grid [9]- [12].Moreover, the voltage stress on capacitors and current stress on inductors and diodes in QZSI are lower than traditional ZSI for same input and output voltage. QZSI avoids inrush current at starting, where destroy of the devices can be avoided and also these topologies are more viable for solar cell and fuel cell applications it may acquire high voltage gain to match the source voltage difference [13], where for the same input and output voltages, it can use lower duty cycle and higher modulation index, which results in less switching stresses, better output power and lower input current ripple. The advantage of including inductors in the QZSI network will limit the current ripple through the devices during boost conversion mode.

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“…Although the VSI with the boost converter has one more IGBT switch compared to the ZSI, but the power loss in the ZSI structure is significantly higher [7,8]. Accordingly, the efficiency of ZSI structure is lower.…”

Section: Power Loss Problem In the Zsi Structurementioning

confidence: 99%

“…In general, four different types of losses occur in the semiconductor devices including driving, conduction, off-state and switching losses. The driving and off-state losses versus the conduction and switching losses are negligible due to very small values [7].…”

Section: Power Loss Problem In the Zsi Structurementioning

confidence: 99%

“…These topologies have many disadvantages and limits, such as the need for a large capacitor in the DC-link, only buck mode operation, the requirement for dead time between PWM duty cycles, and noise issues due to electromagnetic interference [5]. To overcome these problems, a new inverter topology known as impedance source inverter (ZSI) has attracted a lot of attention recently [6][7][8][9]. Some advantages of ZSI compared to the previous structures are the ability to increase or decrease the voltage over a wide range by setting the shoot-through (ST) time interval, the possibility of shoot-through without damaging of the switches, a second order filtering by impedance network and power quality improvement, the high switching frequency of the impedance network which is 6 times more than inverter frequency leading to size reduction of the elements, less influence of EMI noise, and etc [10,11].…”

Section: Introductionmentioning

confidence: 99%

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A Multi–Objective Optimization for Performance Improvement of the Z–Source Active Power Filter

Hosseini

Beromi

2016

Journal of Electrical Engineering

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The high power dissipation is one of the most important problems of the z-source inverter (ZSI). By using an appropriate optimization scheme, the losses can be significantly reduced without any negative impact on the other characteristics of the inverter. In this paper, a multi-objective optimization is implemented in order to reduce the ZSI total losses as well as to improve the z-source active power filter (APF) performance. The optimization is focused on the four important objectives including power losses of the Z-source APF, the initial cost of the system components, the voltage and current ripples, and the boost factor of the z-source network. For these purposes, the multi-objective genetic algorithm (MOGA) is employed. The numerical and simulation results are presented to evaluate the optimization performance. The results show that a good balance can be achieved between the switching power losses, the voltage-current ripple levels, the component costs and the boost factor using the optimized parameters.

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Sigma‐Z‐source inverters

Cited by 50 publications

References 32 publications

A Review of Galvanically Isolated Impedance-Source DC–DC Converters

A Review of Galvanically Isolated Impedance-Source DC–DC Converters

Quasi-Z-Source Inverter Topologies with Reduced Device Rating: a Review

A Multi–Objective Optimization for Performance Improvement of the Z–Source Active Power Filter

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