Sajib Chakraborty

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

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...

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...

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...

This paper develops a multi-objective co-design optimization framework for the optimal sizing and selection of battery and power electronics in hybrid battery energy storage systems (HBESSs) connected to the grid. The co-design optimization approach is crucial for such a complex system with coupled subcomponents. To this end, a nondominated sorting...

The paper presents a precise and efficient model of Double-Side Cooled (DSC) SiC MOSFET, which incorporates the dynamics of both electrical and thermal variables. It offers a suitable computational complexity for simulating transients in complex power converters. The objective is to define a model that enables multi-scale time simulations and facil...

This paper presents a digital twin concept to accurately estimate the power losses of a traction inverter operating under different dynamic driving cycles by utilizing analytical models. The paper illustrates the different stages involved in developing the digital twin, including data collection, optimisation techniques and training. A physical sys...

Electric vehicles (EVs) have gained global attention as a solution to climate change and pollution caused by internal combustion engine vehicles (ICEVs). However, the limited driving range and long charging time pose challenges for EVs. Higher power density and efficiency in power electronic systems can increase the driving range of EVs. Advancemen...

The wide-scale adoption and accelerated growth of electric vehicle (EV) use and increasing demand for faster charging necessitate the research and development of power electronic converters to achieve high-power, compact, and reliable EV charging solutions. Although the fast charging concept is often associated with off-board DC chargers, the impor...

Active Front-End (AFE) rectifiers have regained momentum as the demand for high-power Electric Vehicle (EV) charging infrastructure increases exponentially. AFE rectifiers have high efficiency and reliability, and they minimize the disturbances that could be generated due to the operation of the EV charging systems by reducing harmonic distortion a...

Electric vehicles (EVs) are expected to take over the transportation and mobility market over traditional internal combustion engine (ICE) vehicles soon. The internal power demands of EVs are expected to increase. The reason for this is to achieve a longer driving range for the EV and to provide the required power for the low-voltage (LV) network a...

The global promotion of electric vehicles (EVs) through various incentives has led to a significant increase in their sales. However, the prolonged charging duration remains a significant hindrance to the widespread adoption of these vehicles and the broader electrification of transportation. While DC-fast chargers have the potential to significant...

Nowadays, the implementation of smart charging concepts and management strategies with vehicle-to-everything (V2X) functionalities, is required to address the increasing number of battery electric buses (BEBs) in cities. However, the introduction of these new functionalities to the charging systems might affect the lifetime of the charging infrastr...

Long-haul heavy-duty vehicles, including trucks and coaches, contribute to a substantial portion of the modern-day European carbon footprint and pose a major challenge in emissions reduction due to their energy-intensive usage. Depending on the hydrogen fuel source, the use of fuel cell electric vehicles (FCEV) for long-haul applications has shown...

This article reviews the different topologies compatible with V2G feature and control approaches of integrated onboard charger (iOBC) systems for battery electric vehicles (BEVs). The integrated topologies are presented, analyzed, and compared in terms of component count, switching frequency, total harmonic distortion (THD), charging and traction e...

In large-scale industrial machine applications (IMAs) during condition monitoring, all sensor devices can produce raw data up to 15TB of data/week. Transmitting these large high-frequency data sets to the cloud to closely monitor the operational environment and make decisions is not feasible for two reasons : (a) bandwidth and latency issues and (b...

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,...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...