Sajib Chakraborty

Sajib Chakraborty
Vrije Universiteit Brussel | VUB · Electrical Engineering and Power Electronics (ETEC)

Doctor of Engineering Sciences

About

43
Publications
74,233
Reads
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380
Citations
Introduction
Sajib was born in Chittagong, Bangladesh, in 1992. He received the B.Sc. degree in Electrical & Electronic Engineering from the Independent University, Bangladesh in 2013, and an M.Sc. degree in electrical and electronic engineering from the Independent University, Bangladesh, in 2016 with distinction. Currently, he is working as a Ph.D. researcher at VUB. His research interests are in PE for EVs, Physics-based reliability analysis of EVs converters, PE Digital Twin,renewable energy technology.
Additional affiliations
March 2018 - April 2022
Vrije Universiteit Brussel
Position
  • PhD Student
May 2017 - present
Independent University, Bangladesh
Position
  • Lecturer
September 2016 - February 2018
Independent University, Bangladesh
Position
  • Lecturer
Education
March 2018 - April 2022
Vrije Universiteit Brussel
Field of study
  • Electrical Engineering
June 2015 - September 2016
January 2010 - August 2013
Independent University, Bangladesh
Field of study
  • Power Electronics & Renewable Energy

Publications

Publications (43)
Article
This article presents an overview of different transformer-less single-phase grid-connected photovoltaic inverters with various filter circuits including immittance conversion topology for residential application. Various inverter topologies are presented, compared, and evaluated against components used, size, cost, self life, losses, and efficienc...
Article
Full-text available
This article reviews the design and evaluation of different DC-DC converter topologies for Battery Electric Vehicles (BEVs) and Plug-in Hybrid Electric Vehicles (PHEVs). The design and evaluation of these converter topologies are presented, analyzed and compared in terms of output power, component count, switching frequency, electromagnetic interfe...
Article
Full-text available
Automotive Original Equipment Manufacturers (OEMs) require varying levels of functionalities and model details at different phases of the electric vehicles (EV) development process, with a trade-off between accuracy and execution time. This article proposes a scalable modelling approach depending on the multi-objective targets between model functio...
Article
Full-text available
The rapid growth of Battery Electric Vehicles (BEVs) in the automotive field has led to a need for improving their drivetrain performance, mainly focusing on the extension of the battery operating range. However, the majority of performed technical assessments only consider battery SoC and depth of discharge while neglecting the effects on lifetime...
Conference Paper
Full-text available
Tea is a popular beverage all around the world, and in Bangladesh the cultivation of tea plays a vital role. Many diseases affect the proper growth of tea leaves leading to its reduction,thus hindering of the production of tea. However, if the disease is identified at an early age it would solve all the above mentioned problems through the applicat...
Conference Paper
Full-text available
This paper proposes a new multifunctional 6-phase Interleaved Bidirectional DC/DC Converter (IBC) topology, which can perform two distinct functionalities independently as function 1: a 6-phase IBC for traction/braking modes and function 2: a typical level-2 fast onboard vehicular battery charger (OBC) for charging/discharging modes. In function 2,...
Conference Paper
Full-text available
This paper proposes an optimal design procedure of high-power off-board charger (Off-BC) systems for electric vehicle EV applications. The main purpose is to design a high-power DC charging system with low current ripples for achieving maximum efficiency. This paper presents linear and non-linear modelling of a 175kW three-phase AC/DC converter for...
Conference Paper
As Wide Bandgap (WBG)-based semiconductors are being widely used in Electric Vehicles (EVs) drivetrains, it becomes essential to assess the reliability of the WBG-based power electronics converters (PEC). Nevertheless, the ageing response of WBG-based converters in the EVs throughout a complete mission-profile has remained a significant concern for...
Conference Paper
This paper presents an all-inclusive review and comparative analysis of single-input multi-output (SIMO) inverter topologies, with some suggestions on selection of suitable configurations for automotive applications. With the rising trend in the automotive industry towards full vehicle electrification and autonomous driving, X-by-wire (XBW) technol...
Conference Paper
This paper presents an optimization procedure using a genetic algorithm (GA) for the dual-loop control scheme based on type-III controllers in a 6-phase interleaved converter. Four different objective functions (i.e. integration of squared and absolute errors and their time-weighted variants) are selected as the fitness functions of the GA. Based o...
Conference Paper
To achieve a high-performance index and accurate controllability of power electronics converters (PEC), generalized small-signal analysis of the closed-loop power electronics converters is a key aspect. This article presents a detailed generalized small-signal averaged switch model (GSSASM) of a Wide Bandgap (WBG)-based Interleaved DC/DC Buck conve...
Article
Full-text available
This article proposes a holistic codesign optimization framework (COF) to simultaneously optimize a power conversion stage and a controller stage using a dual-loop control scheme for multiphase SiC-based DC/DC converters. In this study, the power conversion stage adopts a non-isolated interleaved boost converter (IBC). Besides, the dual-loop contro...
Conference Paper
The future trends in renewable energy generation are to select appropriate components and topology for power electronics converters with optimized costs and power density while satisfying the reliability target. This paper evaluates the reliability of a PID-controlled synchronous buck converter-based (SBC) battery charging controller for solar-powe...
Article
Full-text available
With the increasing demand for electric vehicles, the requirements of the market are changing ever faster. Therefore, there is a need to improve the electric car's design time, where simulations could be an appropriate tool for this task. In this paper, the modeling and simulation of an inverter for an electric vehicle are presented. Four different...
Conference Paper
The advent of Wide-Bandgap (WBG) semiconductors, e.g., Silicon Carbide (SiC) and Gallium Nitride (GaN), power electronics E-drive converters are projected to obtain an increase in power density as ~2x for SiC devices and ~4x for GaN devices, which demand detailed thermal modeling and analysis of power semiconductors and cooling systems. This paper...
Conference Paper
This article presents the scalable and accurate modelling technique of a Wideband Gap-based (WBG) bidirectional DC/DC converter to achieve high efficiency while satisfying a set of design constraints. Using Si and SiC-based switches, the converter is scaled for different power ratings (10kW~50kW). Moreover, to scale the passive components of the DC...
Conference Paper
This article presents a systematic multi-fidelity optimization framework applied to a 60kW Multiport Converter (MPC) for Electric Vehicle drivetrains. The proposed design methodology integrates the multidisciplinary design process through the integration of system optimization, multi-domain modeling, and existing Computer Aid Design (CAD) tools. At...
Article
Full-text available
A Proportional-Integral-Derivative (PID)-controlled synchronous buck converter (SBC)-based battery charging system was designed to charge a lead-acid cell battery using commercially available Photovoltaic (PV) panel. The proposed system was installed aboard a fishing trawler to power its electrical system replacing the conventional system, which us...
Article
Full-text available
DC/DC Multiport Converters (MPC) are gaining interest in the hybrid electric drivetrains (i.e., vehicles or machines), where multiple sources are combined to enhance their capabilities and performances in terms of efficiency, integrated design and reliability. This hybridization will lead to more complexity and high development/design time. Therefo...
Conference Paper
Full-text available
This article illustrates a green energy technology for power generation using cow urine. The aim of this research is to design and analysis with chemical and physical model of a low-cost, chamber-based power plant to harvest electricity from cow urine. The proposed model works like a conventional battery system. However, a discharged battery needs...
Conference Paper
Full-text available
This paper discusses the economic analysis of a dairy farm in a suburb of Dhaka city in Bangladesh using a new source of renewable energy, energy from cow urine that can produce electricity by electrolytic conductions. This system is entirely green, carbon free and economically feasible solution. The Life Cycle Cost Analysis (LCCA) of this implemen...
Conference Paper
Full-text available
In Bangladesh, approximately 3900 square miles of entire length is surrounded by 700 rivers including tributaries.Around 770,000 inland and 510,000 marine fishermen survive in this country, whose income entirely depends on fisheries. Bangladeshi fishermen mainly use trawler for fishing purpose in sea and river. Those trawler boats require electric...
Conference Paper
This paper discusses the Life Cycle Cost Analysis (LCCA) of a fishing trawler using solar energy to be installed in the Bay of Bengal in Bangladesh. This system is entirely green, free and economically feasible solution for a fishing trawler for cultivating fish in Chittagong region of Bangladesh. The Life Cycle Cost Analysis of this proposed desig...
Conference Paper
Full-text available
In Bangladesh, approximately 24,140 kilometers of entire length is surrounded by 700 rivers including tributaries. Around 1,280,000 fishermen exist in the whole country, among them 770,000 inland and 510,000 marine fishermen whose income entirely depends on fisheries. Bangladeshi fishermen mainly use trawlers (fishing boats) for fishing purpose in...
Conference Paper
Full-text available
Bangladesh is a riverine country. Approximately 24,140 Kilometers of entire length in this country are surrounded by 700 rivers including tributaries. In Bangladesh around 1,280,000 fishermen exist, among them 770,000 inland and 510,000 marine fishermen whose income entirely depends on fisheries. Bangladeshi fishermen mainly use trawler for fishing...
Conference Paper
Full-text available
A transformer-less high-performance 0.1/12kV DC-DC converter using Cockcroft-Walton (CW) voltage multiplier topology is presented in this paper. The proposed CW topology is suitable for low-input DC generation systems application. At first the low input DC voltage is inverted and then boosted up through an n-stage CW voltage multiplier to attain lo...
Conference Paper
Full-text available
This paper provides a brief impact on penetration testing and the methodology used. The paper also renders an overview of use of IPv6 has on remote penetration testing of servers and web applications. Testing penetration is a very common and familiar method for measuring and assessing the security of a network or information. A penetration tester s...
Conference Paper
Full-text available
In this paper, 100% stator ground fault protection by application of low frequency (20 Hz) injection for 6.6/132 KV alternators have been investigated. Here, different types of faults of alternators and possible protections by conventional means have been discussed. It is shown why conventional method by differential relay protection is not adequat...
Conference Paper
Full-text available
This article introduces the design of a transformer-less single-switch mode (SSM) photovoltaic grid-tie boost inverter (GTBI) with immittance conversion topology for residential applications. The proposed GTBI employs only an SSM boost inverter circuit along with a T-LCL immittance converter. As the proposed design is entirely transformer-less with...
Article
Full-text available
In control system design it is difficult to ascertain the appropriate value of controller gain. Generally a high gain value causes an excessively oscillatory response with the possibility of instability, while a low gain value produces a slow system response. The desired optimal response is a value of gain that produces a quick system response with...
Conference Paper
Full-text available
This paper introduces, design and analysis of hybrid solar-wind energy system using CUK and SEPIC converter. This design lets the two sources to supply the load individually or concurrently depending on the availability of the energy sources. The proposed design employs a switch mode CUK converter and a switch mode SEPIC converter. The designed CUK...
Conference Paper
Full-text available
This paper presents a transformer-less grid-tie hybrid photovoltaic and wind energy system. The proposed hybrid system consists of a wind turbine, a Permanent Magnet Synchronous Machine (PMSM), a three phase diode bridge rectifier, an wind-side converter, Photovoltaic (PV) array, a dcdc converter, a grid interface inverter and a T-LCL filter. The p...
Article
Full-text available
This article introduces the design and analysis of a single-phase single-stage transformer-less grid-tie buck-boost photovoltaic inverter topology for domestic purposes. Functionally, this new inverter can adjust to a wide range of photovoltaic dc variations, higher or lower dc voltages compared to utility line voltage, and in the meantime track th...
Conference Paper
Full-text available
In conventional inverters, implementation of a transformer greatly enhances the Total Harmonic Distortion (THD) which is counted to have a negative impact on the inverter output. In order to overcome this limitation, transformer can be replaced by buck and boost converters thereby making a transformer-less inverter which will greatly reduce the THD...
Conference Paper
Full-text available
The following paper presents a newly developed transformer-less grid-tie pure sine wave inverter (GTI) for photovoltaic (PV) application. The proposed topology employs a PV panel, a dual-stage switch mode boost converter, a voltage divider circuit, an H-bridge inverter and a T-LCL Immittance conversion filter circuit. For gate drive circuit of inve...
Conference Paper
This article introduces the design of a three-switch single-phase single-stage grid-connected buck-boost photovoltaic inverter topology for residential applications. The proposed design topology has numerous desirable features such as better utilization of the photovoltaic array, low cost, compact size, simpler control and higher efficiency. For sw...
Article
Full-text available
This paper introduces a topology for transformer-less pure sine wave grid-tie inverter (GTI) for photovoltaic (PV) applications. The proposed GTI employs a dual-stage switch mode boost converter, a dual-stage switch mode buck converter, an H-bridge inverter and a T-LCL immittance conversion circuit. For switching of GTI power circuit, a combination...

Projects

Projects (7)
Project
The InfraREL-PE project addresses and supports companies in the development of power electronics components and subsystems up to and including market readiness, more specifically: (1) Allowing a range of tests according to regulatory requirements for PE component manufacturers (i.e., AEC-Q100, IEC 60749-34, IATF-16949, AQG 324, etc.) and company-specific test procedures to accurately verify the stress test qualification and product reliability. These tests’ standard test conditions are 1,000 h, ΔTj 100OC, maximum load current 400A, 4-6 IGBTs in parallel operation, and high-resolution thermal impedance curve up to 20kHz. (2) Assess the operating limits of new switching components (i.e., SiC and GaN) and subsystems (i.e., new heatsinks, busbars) by exposing them to various test conditions; e.g., HF utilization (50kHz to MHz) and thermal tests conditions of Tmin/Tmax=-40/+125oC, 100 changes (up to 1500 changes for modern components) between max and min temperature are considered.
Project
The objective of DT4V is to develop a framework to minimize the validation cost and time of motion products for three use case scenarios either by doing a full virtual validation or potentially supported by a limited set of dedicated HIL measurements (with specific components as device-under-(specific)test)). The considered motion product is a generic drive train consisting of power electronics, an electric motor and a gearbox, both with their bearings.
Project
The context of this project is condition monitoring and anomaly detection in drivetrains. The consortium companies are OEMs (Atlas-Copco, Bekaert, Powerdale) and monitoring system providers (Televic Rail) that leverage the sensor signals available from power-electronic converters and accelerometers to monitor the health of (a fleet of) assets, as well as detect anomalies.