Dynamic behaviour of qZS-based bi-directional DC/DC converter in supercapacitor charging mode

Zaķis, Jānis; Vinnikov, Dmitri; Husev, Oleksandr; Raņķis, Ivars

doi:10.1109/speedam.2012.6264554

Cited by 15 publications

(9 citation statements)

References 5 publications

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“…As with the VSC and the CSC, the IS isolated DC-DC converter assures a bidirectional power flow if the diode of the ISN is replaced by a bidirectionally conducting, unidirectionally blocking switch. During reversed power flow, the ISN operates as a low-pass filter and suppresses the high frequency ripple without any reconfigurations [5]. Therefore, it justifies the ISC regarded as a versatile topology for applications in which a wide range of input voltage and load regulation is essential.…”

Section: General Comparison With Voltage Source and Current Sourcmentioning

confidence: 99%

“…They have a wide input voltage and load regulation range that allows a better use of the energy source. Other advantages of the IS galvanically isolated DC-DC converters include the possibility of converterless integration of the short-term energy storages (batteries) [4], bidirectional operation capability [5]- [7], and the inherent short-circuit protection. Converterless energy storage integration could be provided through direct connection of a battery in parallel with an impedance source network capacitor [8].…”

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confidence: 99%

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

Chub

Vinnikov

Blaabjerg

et al. 2016

IEEE Trans. Power Electron.

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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: General Comparison With Voltage Source and Current Sourcmentioning

confidence: 99%

mentioning

confidence: 99%

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

Chub

Vinnikov

Blaabjerg

et al. 2016

IEEE Trans. Power Electron.

Self Cite

204

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“…Applying the triangular shape of current the amplitude of voltage can be calculated as a product of approximately time duration of switching half-cycle and a fourth of the amplitude of current in resonant circuit over capacitance of the resonant circuit: Fig. 1) is used in circuit of DC supply source for provision of operation of switching converters as in BUCK as well in the BOOST mode [1,2,10,11]. At the later periodically shortening of converter legs named as shoot-through cycles can be applied increasing in result voltage at output of a qZ link [2,10].…”

Section: Simplified Mathematical Description Of the Processesmentioning

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%

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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“…The major difference between impedance source dc-ac (inverters) and DC-DC converters lies on how the output is taken. For inverters, it is taken across a switch while for the DC-DC converter, they are mostly taken across a capacitor [13] as shown in Figure 1 (b) and (c), although [15], [16], [18], [19], [21]- [23] took the output across a switch albeit with additional components in what is called PWM DC-DC impedance source converters. Reference [15] analysed the steady-state performance of such converters in continuous conduction mode (CCM).…”

Section: Introductionmentioning

confidence: 99%

Dynamic model of A DC-DC quasi-Z-source converter (q-ZSC)

Ado¹,

Jusoh²,

Mutawakkil³

et al. 2019

IJECE

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Two quasi-Z-source DC-DC converters (q-ZSCs) with buck-boost converter gain were recently proposed. The converters have advantages of continuous gain curve, higher gain magnitude and buck-boost operation at efficient duty ratio range when compared with existing q-ZSCs. Accurate dynamic models of these converters are needed for global and detailed overview by understanding their operation limits and effects of components sizes. A dynamic model of one of these converters is proposed here by first deriving the gain equation, state equations and state space model. A generalized small signal model was also derived before localizing it to this topology. The transfer functions (TF) were all derived, the poles and zeros analyzed with the boundaries for stable operations presented and discussed. Some of the findings include existence of right-hand plane (RHP) zero in the duty ratio to output capacitor voltage TF. This is common to the Z-source and quasi-Z-source topologies and implies control limitations. Parasitic resistances of the capacitors and inductors affect the nature and positions of the poles and zeros. It was also found and verified that rather than symmetric components, use of carefully selected smaller asymmetric components L1 and C1 produces less parasitic voltage drop, higher output voltage and current under the same conditions, thus better efficiency and performance at reduced cost, size and weight.

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Dynamic behaviour of qZS-based bi-directional DC/DC converter in supercapacitor charging mode

Cited by 15 publications

References 5 publications

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

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

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

Dynamic model of A DC-DC quasi-Z-source converter (q-ZSC)

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