Lubaba Bashar

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Rui Hao

Imperial College London

Kevin M Kerrigan

The University of Sheffield

Kiran Dasari

University of Illinois at Urbana-Champaign

Arantxa Vilalta-Clemente

University of Rouen (France)

Dr. Kandassamy kichenamourty

Annmalai University

Binnur Sağbaş

Yildiz Technical University

Dinesh C Gupta

Jiwaji University Gwalior M.P.

Austin Jun Luo

Beijing Normal University

Gilmar Guimaraes

Universidade Federal de Uberlândia

Bisma Ali

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Papers by Lubaba Bashar

A novel Split-Pi converter with high step-up ratio

2017 IEEE Region 10 Humanitarian Technology Conference (R10-HTC)

Contribution of this paper is to present a high step up converter convenient for universal line b... more Contribution of this paper is to present a high step up converter convenient for universal line base on a customized version of the Split-Pi converter. Developed configuration integrates voltage multiplier technique with the classical Split-Pi circuit to obtain new operating characteristics of high step up static gain. Split-Pi converter has an enormous prospect to meet up current power electronic systems aspiration of high quality and reliable bidirectional operation; to appeal green energy. Furthermore, it is realized that the minimal step up feature of the proposed converter is 2 times of the input voltage. This study aims to illustrate the feasibility of the proposed converter over classical converter considering step up ability. The theoretical analysis is done on the basis of steady state condition. As well as, simulated results obtained with the proposed structure are produced using MATLAB/SIMULINK tool.

Investigation of a three phase switch mode single ended primary inductor converter power factor corrected rectifier

Input switched SEPIC topology based output voltage regulated 3-phase 3-switch modular rectifier c... more Input switched SEPIC topology based output voltage regulated 3-phase 3-switch modular rectifier circuit is proposed and developed in this thesis. Fully controlled three phase converters consisting of six controlled switches are ideal methods for bidirectional AC-DC conversion. Complexity of control, requirement of protection against devices failure and costs limit their applications. In large rectifiers, harmonic current injection technique is used for PFC, THD and efficiency improvement but this technique requires separate dc sources for generating harmonic current to be injected. Three phase AC-DC converters may use uncontrolled bridge rectifiers followed by DC-DC converters. These provide input current shaping with low THD. Large filters at their inputs degrade the conversion efficiency. Modular three phase rectifiers are composed of three single phase PFC rectifiers, where, input current waveforms are controlled by three switches and the output is taken from a DC rail. They are capable of being controlled like single phase boost PFC rectifiers. In this work, a modular three-phase power factor corrected (PFC) single ended primary inductor converter (SEPIC) rectifier is investigated. The advantage of the circuit is its ability to rectify individual voltage of three phases separately and superimpose them at the load. Per phase rectification allows sinusoidal input current shaping in the circuit by standard feedback control. Also boost topology at the input stage with series inductor allows easy reduction of input current total harmonic distortion (THD) and improvement of input power factor. The proposed rectifier is a high performance controlled rectifier compared to traditional ones in terms of power factor, input current THD and conversion efficiency. The SEPIC topology retains benefits of buck/boost gain facility and provides capacitor isolated output. The performance results have been compared for the open and closed loop voltage regulations. In open loop system, the output voltage of the rectifier has been controlled by standard duty cycle control technique. To ensure high performance feedback control circuits have been employed with current and voltage controller loops. The performance of the proposed circuit has been found to be satisfactory in simulation and experimental results. Typical dynamic responses of the circuit are included to demonstrate its effectiveness to regulate output voltage during load changes with the performance remaining almost the same. vi TABLE OF CONTENT CONTENT

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A review of primary technologies of thin-film solar cells

Engineering Research Express, 2021

Thin-film solar cells are preferable for their cost-effective nature, least use of material, and ... more Thin-film solar cells are preferable for their cost-effective nature, least use of material, and an optimistic trend in the rise of efficiency. This paper presents a holistic review regarding 3 major types of thin-film solar cells including cadmium telluride (CdTe), copper indium gallium selenide (CIGS), and amorphous silicon (α-Si) from their inception to the best laboratory-developed module. The remarkable evolution, cell configuration, limitations, cell performance, and global market share of each technology are discussed. The reliability, availability of cell materials, and comparison of different properties are equally explored for the corresponding technologies. The emerging solar cell technologies holding some key factors and solutions for future development are also mentioned. The summarized part of this comparative study is targeted to help the readers to decipher possible research scopes considering proper applications and productions of solar cells.

Three phase one switch modular-boost/vienna power factor corrected (PFC) rectifier

2017 IEEE International Conference on Industrial Technology (ICIT)

The power conversion circuit of a three phase Vienna or Modular-Boost switching power factor corr... more The power conversion circuit of a three phase Vienna or Modular-Boost switching power factor corrected (PFC) rectifier uses three controlled switches, eighteen diodes and two output split capacitors. Three PFC controller circuits are necessary for conversion circuit's voltage regulation, power factor control and input current waveform improvement. The circuit has been modified to have fewer active and passive components in the power circuit. The input voltages and currents are sensed and conditioned to one voltage and one current signal for the feedback controller circuit. Reduction of controlled switches, diodes of the power circuit, sensors, isolation, base drive supply circuits makes overall operation of the circuit reliable. The proposed three phase boost PFC rectifier circuit is easy to design, fabricate, operate and maintain. It occupies less space and is lighter in weight. Disadvantages of unidirectional power flow and only step-up voltage gain characteristics of conventional three phase Vienna/Modular-Boost rectifiers remain in the proposed modified circuits.

Diode-bridge enclosed one switch three-phase power factor corrected (PFC) Ĉuk rectifier

2017 IEEE International Conference on Industrial Technology (ICIT), 2017

A new one-switch three phase power factor corrected (PFC) rectifier is presented in this paper. T... more A new one-switch three phase power factor corrected (PFC) rectifier is presented in this paper. The proposed 3-phase ac-dc converter is based on Ĉuk topology. Proper feedback control of the circuit can maintain high power factor and low input current total harmonic distortion (THD). Use of minimum number of control switch in the proposed power conversion circuit reduces components, drivers drive isolation circuits, associated sensors and control circuits. The operation of the circuit is described by simulation and experimental results. The proposed 3-phase Ĉuk topology based rectifier is reliable in terms of operation, maintenance, control and efficiency of conversion. Boost input stage of the proposed circuit makes the circuit capable of being controlled like a single-phase boost PFC rectifier. Due to Ĉuk topology based power conversion the converter provides boost-buck ideal input/output voltage gain relationship.

A modular one-switch three-phase Single Ended Primary Inductor (SEPIC) rectifier

2017 IEEE International Conference on Industrial Technology (ICIT), 2017

An input switch based modular Single Ended Primary Inductor (SEPIC) three phase AC-DC converter i... more An input switch based modular Single Ended Primary Inductor (SEPIC) three phase AC-DC converter is proposed in this paper. The proposed rectifier has the advantage of step-up/down voltage gain with boost input stage. Input boost stage allows input current shaping accompanied by power factor correction. The topology will also provide possible capacitive isolation of input/output sides of the converter. The rectifier has minimum number of controlled switch, less number of diodes, fewer controller components and driver, isolators, sensors and heat sinks than other input switched three phase rectifiers. As a result, the proposed rectifier will be easy to operate, maintain, reliable in operation, light weight, compact and cost effective. The proposed three phase SEPIC rectifier is presented in this paper with its typical simulation and prototype's experimental results.

Output regulated one-switch three-phase boost and boost-buck (SEPIC) PFC rectifiers

2016 IEEE International Conference on Power System Technology (POWERCON), 2016

New output regulated one-switch boost and boost-buck three phase rectifiers are presented in this... more New output regulated one-switch boost and boost-buck three phase rectifiers are presented in this paper. Proposed three phase ac-dc converters have power factor correction (PFC) and input current shaping facility in one power stage. Use of minimum number of control switch in each proposed circuit reduces conversion circuit components, drivers and drive isolation circuits, sensors and control circuits. The operation and performance of the circuits are illustrated by simulation and experimental results. Both circuits are robust in terms of operation, maintenance, control and satisfactory efficiency of conversion. Input sides of the converters being of boost topology, they are capable of being controlled like single phase boost PFC rectifiers. The converter with boost-buck voltage gain characteristic is derived from dc-dc SEPIC converter.

Three phase three switch modular Vienna, Boost and SEPIC rectifiers

2016 2nd International Conference on Control, Instrumentation, Energy & Communication (CIEC), 2016

Vienna and Modular three phase Boost power factor correction rectifiers are similar in working pr... more Vienna and Modular three phase Boost power factor correction rectifiers are similar in working principle and performance. In this paper two rectifier schemes are presented as Vienna Rectifiers scheme-1 and scheme-2. A third three phase rectifier scheme, the three phase three switch modular SEPIC rectifier topology is also presented. The SEPIC topology has step-up/down voltage gain characteristic, whereas Vienna rectifier schemes has step-up voltage gain characteristic. The performance results of the proposed three phase three switch SEPIC rectifier are presented in this paper in tabular and graphical formats.

Frequency diversity improvement factor for rain fade mitigation in Malaysia

2015 IEEE International WIE Conference on Electrical and Computer Engineering (WIECON-ECE), 2015

Microwave communication systems in tropical region like Malaysia, operating at higher frequency r... more Microwave communication systems in tropical region like Malaysia, operating at higher frequency ranges, are degraded its performance severely during rains. Hence, the rain fade must be taken in consideration for the MW link design to track the service outage and quality. This paper aims to develop and propose frequency diversity Improvement Factor prediction model for rain fade mitigation from 5-40 GHz. The rain attenuation is predicted based on ITU-R rain attenuation prediction method using measured rain rate in Malaysia. The predicted data are analysed to develop and propose a prediction for the improvement factor. The proposed improvement factor model is investigated according to the fade margin where the frequency separation is set to 5 GHz only.

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Performance Analysis of Rain Fades on Microwave Earth-to-Satellite Links in Bangladesh

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