Quasi-Z-Source Inverter for Photovoltaic Power Generation Systems

Li, Yuan; Anderson, Joel; Peng, Fang Zheng; Liu, Dichen

doi:10.1109/apec.2009.4802772

Cited by 278 publications

(109 citation statements)

References 5 publications

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“…Analytical expressions of semiconductor losses in both topologies are well described in [9], [11], [15]- [17]. Here some of the resulting expressions adapted for the discussed converters and applications are presented.…”

Section: Comparative Analysis Of Power Losses and Efficiencymentioning

confidence: 99%

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Comparative Analysis of Semiconductor Power Losses of Galvanically Isolated Quasi-Z-Source and Full-Bridge Boost DC-DC Converters

Kosenko

Liivik

Chub

et al. 2015

Electrical, Control and Communication Engineering

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-This paper compares semiconductor losses of the galvanically isolated quasi-Z-source converter and full-bridge boost DC-DC converter with active clamping circuit. Operation principle of both converters is described. Short design guidelines are provided as well. Results of steady state analysis are used to calculate semiconductor power losses for both converters. Analytical expressions are derived for all types of semiconductor power losses present in these converters. The theoretical results were verified by means of numerical simulation performed in the PSIM simulation software. Its add-on module "Thermal module" was used to estimate semiconductor power losses using the datasheet parameters of the selected semiconductor devices. Results of calculations and simulation study were obtained for four operating points with different input voltage and constant input current to compare performance of the converters in renewable applications, like photovoltaic, where input voltage and power can vary significantly. Power loss breakdown is detailed and its dependence on the converter output power is analyzed. Recommendations are given for the use of the converter topologies in applications with low input voltage and relatively high input current.

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Section: Comparative Analysis Of Power Losses and Efficiencymentioning

confidence: 99%

“…The inductance of the qZS network inductors required to limit the input current ripple on the level of ∆I% from the nominal is expressed by [9] …”

Section: Design Considerationmentioning

confidence: 99%

Comparative Analysis of Semiconductor Power Losses of Galvanically Isolated Quasi-Z-Source and Full-Bridge Boost DC-DC Converters

Kosenko

Liivik

Chub

et al. 2015

Electrical, Control and Communication Engineering

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“…1 with DC source qZ circuit, bridge mode transistors' commutator, LC resonance circuit in the primary winding of an insulating transformer with secondary winding introduced in the voltage doubling rectifier operating on voltage smoothing capacitor by-passed load, is under examination. Sources [1,2,3] show that such converter can operate as in so named normal regime at switching frequency equally to the resonant one, in the BOOST case at the same control frequency and in the BUCK case when output voltage of the load can be regulated below value corresponding to the normal one. At that later can be applied an increasing frequency of switching ωsw that shortening the normal resonant current halfwave determined by the parameters of the resonant circuit ωr [1,2].…”

Section: Circuit Under Examinationmentioning

confidence: 99%

“…At that the later should be provided increasing a control switching frequency above the resonant one which depends on the accepted values of the resonant circuit inductance L and series resonant capacitor C [3,4,5,6]. A good methodology of investigation of the resonant converters is presented in [7,8,9] but without the qZ link.…”

Section: Introductionmentioning

confidence: 99%

“…The paper [1] proposes to introduce in supply circuit of the DC/DC series resonant converter the qZ circuit [2,3,10,11,12] which allows to obtain operation of an inverter-based converter as in BOOST as well in BUCK operation regimes. At that the later should be provided increasing a control switching frequency above the resonant one which depends on the accepted values of the resonant circuit inductance L and series resonant capacitor C [3,4,5,6].…”

Section: Introductionmentioning

confidence: 99%

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Operation of Resonant DC/DC Converter in the BUCK Operation Regime

Raņķis

Zaķis

2014

Power and Electrical Engineering

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-The series resonant DC/DC converter with isolation transformer is investigated. When switching frequency of input inverter bridge is above the resonant one a shortening of the naturally half-waves of current through a L-C resonant circuit takes place resulting in a circulating current through the DC supply source reducing a mean value of supply current and also reducing load voltage in respect to the one at normally resonant case. The main relations for the case with strong voltage supply source are obtained and operation regimes at raised switching frequency investigated using a computer modeling. Some conclusions are made for proper calculation of parameters. It is shown that the shape of the resonant circuit current at raised frequency grows to the triangular one and that asks for proper correction of the expressions obtained for sinusoidal case. Applying qZ input link processes quite differ from observed for the strong supply -arise charging of the capacitors of the link by influence of circulating current and this phenomena impedes to reducing of the load voltage. That qZ link does not allow to create proper regulation of load parameters.

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Quasi‐Z‐source‐based bidirectionalDC‐DCconverters for renewable energy applications

Kafle

Hossain

Kashif

2021

Int Trans Electr Energ Syst

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Summary This article presents a design, analysis, and implementation of a novel impedance‐source‐based bidirectional DC‐DC converter. The proposed converter employs an impedance network to the existing dual‐active‐bridge (DAB) circuit. It inherits all the advantages of the DAB converter along with extra benefits. Compared with the traditional isolated DC‐DC converter, the proposed converter improved the boost ability of the converter. Also, the converter can withstand the shoot‐through phenomenon in an H‐bridge, improving the reliability. The converter can work in the normal buck/boost DAB mode when extra boost is not required. The bidirectional feature is inherent along with soft switching capability. It is therefore well‐suited for the applications, where wide range of voltage gains are required such as renewable energy systems. The topological configuration and control strategy of the proposed topology in both operational modes are discussed. Simulation and experiments have been carried out to demonstrate the effectiveness of the proposed converter topology. The peak efficiency 97% was observed at the rated load of 500 W.

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Quasi-Z-Source Inverter for Photovoltaic Power Generation Systems

Cited by 278 publications

References 5 publications

Comparative Analysis of Semiconductor Power Losses of Galvanically Isolated Quasi-Z-Source and Full-Bridge Boost DC-DC Converters

Comparative Analysis of Semiconductor Power Losses of Galvanically Isolated Quasi-Z-Source and Full-Bridge Boost DC-DC Converters

Operation of Resonant DC/DC Converter in the BUCK Operation Regime

Quasi‐Z‐source‐based bidirectionalDC‐DCconverters for renewable energy applications

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