A New Transformerless Ultra High Gain DC–DC Converter for DC Microgrid Application

Khan, Shahrukh; Zaid, Mohammad; Mahmood, Arshad; Nooruddin, Abbas Syed; Ahmad, Javed; Alghaythi, Mamdouh L.; Alamri, Basem; Tariq, Mohd; Sarwar, Adil; Lin, Chang‐Hua

doi:10.1109/access.2021.3110668

Cited by 55 publications

(38 citation statements)

References 34 publications

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“…On the basis of the computed values of power losses in semiconductor devices, the energy efficiency of the considered DC-DC converters can be calculated. For example, an influence of selected factors on energy efficiency of selected DC-DC converters is considered in the papers [12,24,50,55,90,94].…”

Section: Results Of Computationsmentioning

confidence: 99%

“…In turn, to model their thermal properties, more complicated models of losses in transistors and diodes are used. They are based on the interpolation of the coordinates of points entered by the user, both from the datasheet DC characteristics and the dependence of energy losses in the transistor-switching process on selected factors [55,56]. Such a method of performing computations make it possible to obtain its relatively short duration time.…”

Section: Methods Based On Transient Analysismentioning

confidence: 99%

“…The classical approach to the formulation of average models of DC-DC converters is used, e.g., in the papers [55,56] to analyse the characteristics of the considered converters dedicated to the microgrid application at the steady state. In such analyses, isothermal piece-wise linear characteristics of semiconductor devices are assumed.…”

Section: Analysis Using Averaged Modelsmentioning

confidence: 99%

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Methods of Fast Analysis of DC–DC Converters—A Review

Górecki

2021

Electronics

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The paper discusses the methods of fast analysis of DC–DC converters dedicated to computer programmes. Literature methods of such an analysis are presented, which enable determination of the characteristics of the considered converters in the steady state and in the transient states. The simplifications adopted at the stage of developing these methods are discussed, and their influence on the accuracy of computations is indicated. Particular attention is paid to the methods of fast analysis of DC–DC converters, taking into account thermal phenomena in semiconductor devices. The sample results of computations of the DC–DC boost type converter obtained with the use of the selected methods are presented. The scope of application of particular computation methods and their duration times are discussed. Computations were performed with the use of SPICE and PLECS.

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Section: Results Of Computationsmentioning

confidence: 99%

Section: Methods Based On Transient Analysismentioning

confidence: 99%

Section: Analysis Using Averaged Modelsmentioning

confidence: 99%

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Methods of Fast Analysis of DC–DC Converters—A Review

Górecki

2021

Electronics

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“…A voltage doubler circuit such as Cockroft-Walton can be used to increase the output voltage [26], and it reduces the voltage stress across the switch. Additionally, the VL technique is used in [25][26][27][28] with a voltage doubler. A non-isolated DC-DC converter based on the VL technique was used to obtain a negative voltage concerning the ground [29].…”

Section: Renewablementioning

confidence: 99%

“…According to the modes of operation of the proposed converter, i C1 on , i C0 on are the capacitor currents when S is turned ON and i C1 off , i C0 off are the capacitor currents when S is turned OFF. The current expressions are shown in (28).…”

Section: Current Stress Of Componentsmentioning

confidence: 99%

A High Step-up DC-DC Converter Based on the Voltage Lift Technique for Renewable Energy Applications

et al. 2021

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High gain DC-DC converters are getting popular due to the increased use of renewable energy sources (RESs). Common ground between the input and output, low voltage stress across power switches and high voltage gain at lower duty ratios are desirable features required in any high gain DC-DC converter. DC-DC converters are widely used in DC microgrids to supply power to meet local demands. In this work, a high step-up DC-DC converter is proposed based on the voltage lift (VL) technique using a single power switch. The proposed converter has a voltage gain greater than a traditional boost converter (TBC) and Traditional quadratic boost converter (TQBC). The effect of inductor parasitic resistances on the voltage gain of the converter is discussed. The losses occurring in various components are calculated using PLECS software. To confirm the performance of the converter, a hardware prototype of 200 W is developed in the laboratory. The simulation and hardware results are presented to determine the performance of the converter in both open-loop and closed-loop conditions. In closed-loop operation, a PI controller is used to maintain a constant output voltage when the load or input voltage is changed.

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A non‐isolated quasi‐Z‐source‐based high‐gain DC–DC converter

Mahmood

Zaid

Khan

et al. 2021

Circuit Theory & Apps

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To overcome the problems associated with Z-source-based DC-DC converters, a quasi-Z-source (QZS)-based high-gain DC-DC boost converter with switched capacitors is proposed in this work. Z-source-based DC-DC converters have problems like low-voltage gain, discontinuous input current, and high-voltage stress on the active and passive components. The proposed converter can produce a high-voltage gain of more than 10 times for a duty cycle of less than 0.5. The converter has other desirable features like reduced voltage stress across the switching components and continuous input current (CIC). It comprises a QZS cell made up of switched inductors and a voltage multiplier cell (VMC) made up of switched capacitors. The power loss analysis is done using PLECS software by incorporating the real parameters of switches and diodes from the datasheet. A hardware prototype of 200 W is developed in the laboratory to verify the working of the converter. In experimental results for an output power of 200 W, the converter is operated with a source voltage of 33 V at a duty ratio of 0.4 providing an output voltage of 395 V. The converter performance is good in open-loop conditions and is verified through experimental results. K E Y W O R D S duty ratio (λ), quasi-Z-source (QZS), voltage multiplier cell (VMC), voltage stress | INTRODUCTIONNowadays, gain DC-DC converters have found applications in electric vehicles (EVs), DC microgrids, switch-mode power supplies, and robotics to name a few. The power range of these high-gain converters varies from few milliwatts to a kilowatt range. The main objective is to build a topology with a high gain and reduced number of components. Desirable features like low voltage and current stress, common ground with low ripple in input current make the highgain converter an attractive choice for renewable energy applications. Conventional step-up converters and their variants need to be operated at a high duty ratio (λ) to obtain high-voltage gain. Consequently, the efficiency decreases, and the stress across the components increases. Moreover, the low and fluctuating output voltage of the PV panel cannot be fed to the inverter directly; it must be boosted with reduced ripple using a high-gain converter. 1,2 In Figure 1, it is depicted that a high-gain DC-DC converter can effectively boost the voltage from various sources like fuel cells, solar PV modules, battery, and an ultra-capacitor. These converters are used at the front end of a grid-connected inverter to maintain the DC-link voltage. The DC-DC converters have isolated and non-isolated structures. The isolated structures

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A New Transformerless Ultra High Gain DC–DC Converter for DC Microgrid Application

Cited by 55 publications

References 34 publications

Methods of Fast Analysis of DC–DC Converters—A Review

Methods of Fast Analysis of DC–DC Converters—A Review

A High Step-up DC-DC Converter Based on the Voltage Lift Technique for Renewable Energy Applications

A non‐isolated quasi‐Z‐source‐based high‐gain DC–DC converter

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