A family of non‐isolated transformerless high step‐up
            <scp>DC‐DC</scp>
            converters

Liu, Lingling; Li, Donghui; Yao, Lele

doi:10.1002/etep.2794

Cited by 20 publications

(14 citation statements)

References 20 publications

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“…Furthermore, duty ratio of the classical converters will tremendously increase by an increment of desired output voltage and this situation means more switching losses for the converter. Luo converters that have a very high boosting ability because of using voltage lift technique can be used to overcome the drawbacks of classical converters 4–6 . The positive output elementary super lift Luo converter (POESLLC) is a type of Luo converter topologies with a simple structure, which using super lift technique that allows the output voltage to increase geometrically.…”

Section: Introductionmentioning

confidence: 99%

Design of type‐2 fuzzy logic controller optimized with firefly algorithm for maximum power point tracking of photovoltaic system based on super lift Luo converter

Keçecioğlu

2022

Int J Numerical Modelling

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The efficiency is a very important parameter for photovoltaic systems. Positive output elementary super lift Luo converter classified as high gain DC‐DC converter are used in photovoltaic systems because of their advantages such as high efficiency, reduced ripples, and low switching loss. The drawback of the photovoltaic system based on this converter is its sensitivity to small changes on the control signal. Both maximum power point tracking and control signal stability require a powerful control system as this is a challenging task for the photovoltaic system. Interval type‐2 fuzzy logic systems have recently been utilized in many control processes due to their ability to model uncertainties better than type‐1 fuzzy logic systems. In this work, interval type‐2 Takagi–Sugeno–Kang fuzzy logic controller was first designed as a controller. Then, the controller, which was proposed for this paper, was optimized with the Firefly Algorithm to improve the control performance. Performance of controllers is evaluated via comparative simulation studies under the most demanding environmental conditions. It has been observed that the proposed controller reduces the settling time by more than 50% and increases the efficiency up to 10% according to the simulation situations.

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Section: Introductionmentioning

confidence: 99%

Design of type‐2 fuzzy logic controller optimized with firefly algorithm for maximum power point tracking of photovoltaic system based on super lift Luo converter

Keçecioğlu

2022

Int J Numerical Modelling

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“…On the contrary, non‐isolated converters have the advantages of low switch stress, small size, and high efficiency. The non‐isolated converters include the Buck, Boost, Buck‐Boost [11], NHS [12], QZS [13], SL [14], SC [14], Ćuk [15] and Zeta [16] converters. The non‐isolated converters comprise input and output common ground type and non‐common ground type converters.…”

Section: Introductionmentioning

confidence: 99%

Analysis, Design and Implementation of a Non‐isolated Switched Inductor/Capacitor Converter with Low Voltage Spikes

Jiang

Zhang

et al. 2021

IEEJ Transactions Elec Engng

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In order to take the advantage of boost capability and filtering characteristics of the switched inductor/capacitor, a non‐isolated switched inductor/capacitor (NSI/C) converter is proposed. The topological structure of the non‐isolated switched inductor/capacitor converter is analyzed in detail, and the DC steady‐state model is established in continuous conduction mode (CCM). The voltage gain of the converter and the stress of the switch in the converter are theoretically deduced and compared with the existing converters; the parameter design of the inductance and capacitance is calculated. The simulation model was built in MATLAB/Simulink, and the correctness of the theoretical calculation for the proposed converter was verified by simulation results. Finally, the experimental prototypes of the proposed converter and the non‐isolated high step‐up (NHS) converter were built. Through the comparison of experimental results, the feasibility and validity of the design scheme for the proposed converter are verified. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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“…Generally, energy storage elements like inductors, capacitors and diodes are additionally employed to enhance the voltage conversion ratio of conventional boost converter (CBC) 7,8 . In the single switch converters presented in various studies, 9‐11 voltage multiplier (VM) networks are adopted to obtain good voltage gain values.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐high gain DC‐DC converter based on interleaved quadratic boost converter with ripple‐free input current

Samuel

Keerthi

Prabhakar

2020

Int Trans Electr Energ Syst

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Background In this paper, an ultra‐high gain DC‐DC converter (UHGC) which provides a very high voltage conversion ratio value of 21.11 is described. Methods The proposed UHGC is synthesized from a two‐phase interleaved quadratic boost converter (IQBC). The voltage gain of the IQBC is further extended by using the voltage‐lift technique. To meet the standard DC voltage level of 380 V across the load terminals, the output of the voltage‐lifted IQBC is cascaded to a conventional boost converter (CBC). By operating the switches located in the IQBC stage with a duty ratio of 0.5 and 180° phase‐shift, the source current ripples are nullified. Besides drawing a smooth and ripple‐free current from the input, the converter's voltage gain is adjusted by varying the duty ratio of the switch employed in the CBC stage. Results The proposed gain extension concept is practically validated by conducting experiments on 18‐380 V, 150 W prototype converter. Under practical conditions, the proposed converter operates at full‐load efficiency of 94.7%. Moreover, due to the proposed gain enhancing technique, the two switches employed in the IQBC stage are subjected to low voltage stress levels which are 18.95% of the output voltage. By employing a simple closed‐loop control technique, the output voltage is regulated to remain constant at 380 V despite variations in line voltage and load current magnitudes. Conclusion The proposed UHGC possesses some advantageous features like (i) high voltage gain capability, (ii) ability to draw smooth and continuous (ripple‐free) current from the input, (iii) flexible structure which provides the required high voltage gain while drawing smooth current from the source and (iv) ability to quickly regulate the output voltage using simple closed‐loop control. Thus, the proposed UHGC is an appropriate choice for integrating the input PV source to a common DC bus or microgrid.

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A family of non‐isolated transformerless high step‐up DC‐DC converters

Cited by 20 publications

References 20 publications

Design of type‐2 fuzzy logic controller optimized with firefly algorithm for maximum power point tracking of photovoltaic system based on super lift Luo converter

Design of type‐2 fuzzy logic controller optimized with firefly algorithm for maximum power point tracking of photovoltaic system based on super lift Luo converter

Analysis, Design and Implementation of a Non‐isolated Switched Inductor/Capacitor Converter with Low Voltage Spikes

Ultra‐high gain DC‐DC converter based on interleaved quadratic boost converter with ripple‐free input current

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