Student-Teacher Collaboration Culminates in IEEE Transactions
The increasing demand for sustainable energy solutions has led to the development of hybrid energy systems that integrate renewable sources like solar photovoltaic (PV) systems and fuel cells (FC). The practical applications of the research in sectors such as electric vehicles and residential power systems, contribute to a more reliable and sustainable energy future contributing to a more reliable and sustainable future.
Abstract of the research.
This paper introduces novel high-gain tertiary port boost converter (HGTPBC) designed for hybrid energy sources such as solar photovoltaic (PV) and fuel cells (FC). The converter is employed with dual input sources by facilitating modular converters and accomplishes a high step-up voltage gain by virtue of a voltage multiplier in a DC microgrid, where the prosumers can have an islanded operation. The proposed topology allows home appliances to be powered by multiple energy source without the need for a large storage unit. Key features include continuous input current, reduced normalized voltage stress on switches, expandability for multiple input sources and independent source control. The independent control facilitates the standalone operation with single source during source failure or absence. To evaluate the converter performance, a thorough steady-state analysis, both with and without consideration of nonidealities is carried out. Detailed comparisons with existing converter topologies highlight the advantages of the proposed converter. Moreover, the loss distribution and efficiency analysis of proposed converter are presented and found to be 91.59% efficiency at rated power. Theoretical aspects are validated through hardware testing on a 100W laboratory prototype.
Explanation of the Research in layperson’s terms.
The proposed converter is a 100W DC-DC converter topology used in hybrid energy systems applications and electric vehicular applications in DC microgrid. The converter can accept two sources like fuel cell and solar PV system to supply the load and even can be extended for a greater number of sources. Thus, it is suitable for various applications of traction vehicles, household electrifications etc. It exhibits a lower switch stress and higher step-up conversion gain.
Practical Implementation and Social implications
The features include high step-up conversion gain, independent control possible, reduced normalised switch voltage stress. And flexible operation based on PV availability. It is most suitable for electric vehicles, Unmanned ariel vehicles, and hybrid energy systems etc. It improves the reliability of the renewable energy source by the incorporation of the second fixed source, fuel cell. It can be used in various on-grid and off-grid applications like home, hospitals, offices, and educational institutions, especially where source reliability is necessary. The major advantage is the reduction in the size of the source due to higher step-up gain and ease of control between the sources.
Future Research Plans
We are working towards the development of efficient and ultra-high gain bidirectional converters for various applications on DC microgrids. That should be able of reducing the source ratings and to integrate multiple sources to improve the grid reliability. Design and implementation of bidirectional multi-port converters for various applications of DC microgrids, such as renewable and hybrid storage integration are the scope of our research.
The link to the article- https://ieeexplore.ieee.org/document/10772206
- Published in Departmental News, EEE NEWS, News, Research News
Sakura Sangam: Indo Japan Joint Workshop
In a groundbreaking initiative, the Directorate of IR & HS, along with the Department of Mechanical Engineering and Electrical and Electronics Engineering, successfully hosted the “Sakura Sangam: Indo Japan Joint Workshop,” a two-day virtual event held on July 29 and 30, 2024. This workshop, organised in collaboration with Toyo University, Japan and supported by SRM Global Consulting, aimed to foster academic collaboration and cultural exchange between India and Japan.
During the first day, participants delved into key subjects within Mechanical, Electrical, and Electronics engineering, engaging in dynamic sessions that facilitated knowledge exchange and exploration of the latest advancements in these critical fields. The workshop provided a platform for students and professionals alike to enhance their understanding and contribute to ongoing discussions about innovation and technology.
The second day of the workshop was particularly enriching. It featured talks and seminars highlighting the rich cultural heritage of both nations. Attendees had the unique opportunity to gain a deeper appreciation for the traditions and customs that define the Indo-Japanese relationship. Vice Chancellor Dr Manoj K. Arora explained the meaning of ‘Sakura Sangam.’ He noted that “Sakura” refers to cherry blossoms, which are highly cherished in Japanese culture and symbolise the beauty and fleeting nature of life. ‘Sangam’ means ‘coming together’ in Sanskrit. This introduction set the stage for the workshop’s focus on bringing people together and sharing cultures.
Professor discussed India’s reputation as an IT hub and Japan’s renowned manufacturing expertise. He suggested that by combining these strengths, we could share knowledge and strengthen our bonds. The professor then officially started the workshop with a brief introduction, outlining what we will cover over the next two days.
Dr P Vivekananda Shanmuganathan provided a detailed brief on the research activities at SRMAP, with a particular focus on Mechanical Engineering. He highlighted some of the prominent PhD scholars and their ongoing research projects, showcasing their contributions to advanced topics such as innovative manufacturing processes and robotics. This presentation underscored the university’s dedication to cutting-edge research and its role in advancing the field through the efforts of its talented scholars.
Dr Vitalram Rayankula presented his research on Inverse Kinematics, focusing on the “Two Degree of Freedom Manipulator,” a robotic arm with two independent movements. He discussed the challenges of motion planning, particularly when dealing with line-type obstacles. Dr. Rayankula compared scenarios where the manipulator encounters obstacles without collision to those where collisions occur, highlighting the importance of precise calculations and control algorithms for safe robotic operation.
Dr Kiran Kumar discussed electric vehicles (EVs) and their challenges compared to internal combustion engine (ICE) vehicles. He highlighted issues such as the efficiency of ICE components, the longer recharge time for EVs, and the need for additional lead-acid batteries to match the energy density of gasoline. Dr. Kumar emphasized the limitations of current battery technology, which impact the range, weight, and overall efficiency of EVs, while also noting the environmental benefits they offer.
Prof. Shinobu Yamaguchi explored Japan’s changing perspectives regarding India, emphasising the importance of mutual cultural understanding in today’s globalised world. She highlighted how Japan’s view of India has evolved significantly over time.
In addition to technical topics, the workshop also included career-oriented sessions designed to equip students with insights into the professional landscape. Industry experts provided guidance on internships, job prospects, and the latest trends influencing both the Japanese and Indian job markets.
The “Sakura Sangam” workshop proved to be a resounding success, fostering both academic and cultural ties and paving the way for future collaborations between educational institutions in India and Japan.
Dr M Sheikh Mohamed shared insights from his 14-year journey in Japan, focusing on both challenges and growth opportunities.
● Academic Background: Originally from Chennai, Dr. Mohamed completed his B.Sc., M.Sc., and M.Phil. in Biotechnology before moving to Japan.
● Language Challenges: He emphasised the complexity of learning Japanese, especially the kanji script, which can be daunting for newcomers.
● Cultural Adaptation: Dr. Mohamed discussed the importance of mutual respect and understanding in Japan, noting that being polite and helpful can go a long way in overcoming cultural barriers.
● Time Management: He admired the punctuality ingrained in Japanese society, where trains and trams run with remarkable precision.
● Earthquake Preparedness: Recounting an earthquake experience, he observed the calm and orderly manner in which people evacuated buildings, reflecting the nation’s preparedness and resilience.
Thamtoro Elias Dillan, Department of Mechanical Engineering, International Student from Indonesia, provided a detailed account of the key challenges and experiences faced by international students in Japan:
1. Language Barrier: The difficulty of mastering Japanese can be a significant hurdle for international students, impacting daily life and academic success.
2. Student Life: He highlighted the differences in student life between Japan and his home country, including the structure of academic programs and extracurricular activities.
3. Cost of Living: He discussed the relatively high cost of living in Japan, including accommodation, food, and transportation, and offered tips on managing expenses.
4. Location: The choice of university location can greatly affect the student experience, with major cities offering more opportunities but also higher living costs.
5. Help & Support: He stressed the importance of seeking help and support from university resources and local communities to navigate the challenges of living abroad.
Sankar San and Mr. Masahiro Koizumi, Senior Operating Officer of Forum Engineering and Managing Director of Cognavi India, discussed the evolving landscape of educational and career opportunities between Japan and India, focusing on the following aspects:
1. Opportunities in India for Japanese Students: They highlighted the growing interest among Japanese students in India’s IT and engineering sectors, offering diverse opportunities for learning and career growth.
2. Opportunities in Japan for Indian Students: They noted that Japan offers unique opportunities for Indian students, particularly in fields like robotics, engineering, and business management.
3. Identified Gaps: They discussed the gaps in mutual understanding and the challenges students face in adapting to different educational and cultural environments.
4. Changing Trends: They emphasised how initiatives like exchange programs and collaborative projects are bridging these gaps, fostering greater understanding and collaboration.
Sankar San and Jotish San detailed SRM’s strategic initiatives to integrate Japanese language and culture into their curriculum:
● Curriculum Integration: SRM AP has introduced Japanese language courses from the first year, aiming to equip students with the language skills needed for internships and job placements in Japan.
● Destination Japan Program: This program offers students opportunities to experience Japanese culture and work environments, enhancing their global competence.
● Internship and Placement Opportunities: They highlighted partnerships with Japanese companies, providing internships and placements for students, which can be pivotal for career development.
● SRM Group’s Vision: They concluded by sharing SRM’s broader vision of fostering international collaboration and preparing students for a globalized job market.
Ms. Aditi Jain, Director of International Relations and Higher Studies, has eloquently addressed the concept of internationalization and its potential benefits for students from both nations. She highlighted the invaluable partnerships at SRM AP, which foster cross-cultural exchanges and enhance academic collaboration. In her words, “Internationalization not only broadens academic horizons but also cultivates a deeper understanding and appreciation of diverse cultures, preparing students for a globalised world.” These initiatives are not just about enhancing educational experiences; they also empower students to develop a global perspective, essential for succeeding in today’s interconnected environment.
- Published in Departmental News, EEE NEWS, IR-News, Mechanical Engineering NEWS, News
Skill Enhancement Programme: Understanding Renewable Energy and Smart Transportation
The Department of Electrical and Electronics Engineering hosted a highly successful five-day Skill Enhancement Programme on “Renewable Energy and Smart Transportation” from July 22 to July 26, 2024, signalling a major leap forward in addressing the vital sectors of electric vehicles and renewable energy systems. The programme conducted in a hybrid mode, featured live lectures, hands-on training, and interactive sessions, drawing a total of 50 participants. Chief Guest Dr K Sivakumar, HOD-EEE, IIT Hyderabad, highlighted the pressing need for such skill development initiatives and stressed the importance of keeping abreast of advancements in renewable energy and smart transportation.
Expert sessions on the emerging domains of Renewable Energy, including Advanced Power Conversion and Efficient Drives, Design and Simulation Tools, Battery Management and Charging Infrastructure, and Sustainability and Renewable Integration, fostered an in-depth understanding and application of the latest technologies in these fields.
Dr K Sivakumar started off the programme with an engaging session on advanced power conversion techniques and control strategies for electric vehicles. His insights into modern electric vehicle design set a strong foundation for the week. Participants gained a deep understanding and a solid theoretical base on the latest advancements in power converters and control techniques, which are crucial for the design and development of efficient electric vehicles.
Subsequent technical sessions were led by esteemed experts from academia and industry, such as Dr Narasimharaju B L from NIT Warangal, Mr Suraj from Decibels Pvt. Ltd., Dr G Naga Yatendra Babu from Solidpro Engineering Support Pvt. Ltd., Mr Sai Teja Cherla from OPAL-RT, and Dr Kiran Kumar N, Dr Pratikanta Mishra from and Dr V Naresh Kumar from SRM University-AP.
Overall, the Skill Enhancement Programme provided participants with a comprehensive understanding of renewable energy and smart transportation, blending theoretical knowledge with practical skills and fostering discussions on current challenges and future opportunities in these fields.
- Published in Departmental Events, Departmental News, EEE, EEE NEWS, News
A Review of Non-isolated BDC Topologies for Renewable Energy Systems
The Department of Electrical and Electronics Engineering is glad to announce that the paper titled “A Comparative Analysis of Non-Isolated Bi-directional Converters for Energy Storage Applications”, authored by Dr Tarkeshwar Mahto, Dr Somesh Vinayak Tewari, Dr Ramanjaneya Reddy, Assistant Professors and Ms K Mounika Nagabushanam, PhD Scholar has been published in the IOPs Engineering Research Express having an impact factor of 1.7. The paper explores various non-isolated bi-directional DC-DC converter topologies for renewable energy systems, providing insights into their performance and suitability for different applications.
Abstract
Bi-directional DC-DC converters (BDC) are required for power flow regulation between storage devices and DC buses in renewable energy-based distributed generation systems. The fundamental requirements of the BDC are simple structure, reduced switching components, a wide range of voltage gain, low voltage stress, high efficiency, and reduced size. There are different BDC topologies for various applications based on the requirements in the literature. Various BDCs are categorised according to their impedance networks. Isolated BDC converters are large due to high-frequency transformers and hence used for static energy storage applications whereas non-isolated BDC is lightweight and suitable for dynamic applications like electric vehicles. This paper reviews types of non-isolated BDC topologies. The performance of five non-isolated BDC converters under steady-state conditions is evaluated using theoretical analysis. On this basis, the suitability of BDC for different applications is discussed. Further advantages and limitations of converters are discussed by using comparative analysis. The optimisation of BDC for distributed generation systems from the perspectives of wide voltage gain, low electromagnetic interference, and low cost with higher efficiency is identified. Theoretical analysis of the converters is validated by simulating 200W converters in MATLAB Simulink.
The main challenges with energy storage systems are frequent failures due to frequent charging and discharging and the volume of the power converter. The team plans to:
- To design a converter with fewer components, low switching stresses, high power transfer capability, and higher efficiency to deliver continuous current to the energy storage system.
- To work on various control techniques to keep the DC link voltage of the propulsion system constant.
Link to the article
- Published in Departmental News, EEE NEWS, News, Research News
SRM AP Researchers Publish Groundbreaking Paper on DC Microgrid Integration
In a significant stride towards sustainable energy solutions, a team of researchers from the Department of Electrical and Electronic Engineering has unveiled a groundbreaking innovation. Their paper titled “A Novel Multi-Port High-Gain Bidirectional DC–DC Converter for Energy Storage System Integration with DC Microgrids” has been accepted in the prestigious Q1 Journal of Energy Storage, boasting an impressive impact factor of 9.4. The study focuses on addressing the critical challenges associated with energy storage systems (ESS) in direct current (DC) microgrids. Dr Ramanjaneya Reddy, Assistant Professor, Dr Tarkeshwar Mahto, Assistant Professor, and Mrs Maya Vijayan, a dedicated PhD Scholar, collaborated to design a multi-port high-gain bidirectional DC-DC converter. This innovative converter facilitates seamless integration of energy storage systems with DC microgrids, enhancing overall system efficiency and reliability.
Abstract
Bidirectional converters have often been used in numerous applications like DC microgrids, renewable energy, hybrid energy storage systems, electric vehicles, etc. The paper proposes a novel multi-port high-gain (NMPHG) bidirectional DC-DC converter that supports DC microgrid (DC-MG) applications. The main contributions of the proposed converter are high step-up/step-down conversion gain, multiple input ports, lower switch voltage stress, and lower component count owing to the single converter with multiple input ports for DC microgrid applications.
The detailed operational principle, analysis, and design considerations of proposed NMPHG bidirectional DC-DC converters are discussed. Furthermore, the loss analysis, detailed comparison with similar works, and efficiency analysis with non-modalities during forward power flow (LV to HV) and reverse power flow (HV to LV) modes are presented. The efficiency of the proposed converter is found to be 93.8% in forward power flow and 92.9% in reverse power flow modes at rated power. Finally, a hardware prototype of the proposed NMPHG bidirectional DC-DC converter is implemented with 100 W in FPF mode and 200 W in RPF mode with a TMS320F28335 processor and validated with theoretical counterparts.
Explanation of Research in Layperson’s Terms
The proposed converter is a 200W bidirectional topology used in DC microgrid applications such as renewable energy, hybrid energy storage systems, and electric vehicles. The converter can accept two or more sources to supply the load. Thus, it is suitable for various applications of traction vehicles. It exhibits a lower switch stress and reduces the component ratings to lower values.
Title of Research Paper in the Citation Format
A NOVEL MULTI-PORT HIGH-GAIN BIDIRECTIONAL DC-DC CONVERTER FOR ENERGY STORAGE SYSTEM INTEGRATION WITH DC MICROGRIDS
Vijayan, Maya, Ramanjaneya Reddy Udumula, Tarkeshwar Mahto, and Ravi Eswar KM. “A novel multi-port high-gain bidirectional DC-DC converter for energy storage system integration with DC microgrids.” Journal of Energy Storage 87 (2024): 111431.
Practical Implementation or the Social Implications Associated with it
The features include port expandability on the source side, lower switch voltage stress, bidirectional property, and fewer components. It is most suitable for electric vehicles, Unmanned ariel vehicles, and energy storage systems at renewable power plants, etc. It improves the reliability of the grid system whereas hybrid energy storage systems with battery or supercapacitor will improve system stability.
It can be used in various on-grid and off-grid applications like hospitals, offices, and educational institutions, especially where energy backup is very important. These types of converters are more specific for use in fast power transition required such as EVs, drones, aircraft, space vehicles, etc. The major advantage is the reduction in the size of the converter due to multiple source capability and ease of control.
Future Research Plans
We plan to work on a bidirectional converter with better efficiency and ultra-high gain. That should be able to reduce the size of the converter and the source ratings too. Design and implement bidirectional multi-port converters for various applications of DC microgrids, such as renewable and hybrid storage integration.
- Published in Departmental News, EEE NEWS, News, Research News
A Study on Self-Learning Controller Design for DC-DC Power Converters
It is with great pleasure that we announce the publication of a research paper titled “Self-Learning Controller Design for DC-DC Power Converters with Enhanced Dynamic Performance,” jointly authored by Dr Tousif Khan N, Associate Professor, Department of Electrical and Electronics Engineering, and Dr Ramanjaneya Reddy & Dr Arghya Chakravarty, Assistant Professors, Department of Electrical and Electronics Engineering. The research paper introduces a novel self-learning control for precise output voltage tracking in DC-DC buck power converters.
Abstract:
This article introduces a self-learning robust control approach for accurate output voltage tracking in DC-DC buck power converters, focusing on scenarios with high precision requirements and significant load uncertainties. The method employs a simple online neural network to swiftly estimate unexpected load changes and disturbances across a wide range. Operating within a backstepping framework, the controller utilises neural network-learned uncertainties to enhance stability and improve dynamic and steady-state performance of both output voltage and inductor current. Extensive numerical simulations and practical experiments on a laboratory prototype demonstrate substantial enhancements in dynamic performance with a 94% reduction in settling time and precise steady-state tracking. The reliability of the proposed controller is further supported by the consistency between computational and experimental outcomes, showcasing its potential for real-world applications.
Practical implementations:
The proposed controller can be implemented/used for robotics applications, industrial processes, and medical equipment where precise control is needed.
Future research plans:
The following are the potential future directions of the proposed work;
(i) Design and development of the proposed self-learning neural network-based control for DC-DC buck converter systems with real-time DC sources, such as solar PV and fuel cells, experiencing highly intermittent input voltage changes.
(ii) Incorporating inductor current constraints and output voltage limitations into the proposed controller would also be an avenue worth exploring.
We congratulate the professors for their valuable contribution and look forward to future breakthroughs in this area.
- Published in Departmental News, EEE NEWS, News, Research News
Revolutionising LED Lighting: Paper Published in IEEE Transactions on Industry Applications
In a significant academic accomplishment, Dr Ramanjaneya Reddy, Assistant Professor in the Department of Electrical and Electronics Engineering, along with UG students Ms Mehataj Syed and Mr Busam Gopichand, have recently published a groundbreaking paper titled “A Three Leg Asymmetrical Voltage Resonant Converter with Independent Dimming Control for Multiple Load LED Lighting Applications” in the esteemed Q1 journal IEEE Transactions on Industry Applications. The journal boasts an impressive impact factor of 4.4, further underscoring the importance of this research contribution.
The paper delves into the development of a novel Three Leg Asymmetrical Voltage Resonant Converter that offers independent dimming control for multiple load LED lighting applications. This innovation holds great promise for enhancing the efficiency and versatility of LED lighting systems, paving the way for more sustainable and adaptable lighting solutions in various industrial applications.
Dr Ramanjaneya Reddy’s leadership and the collaborative efforts of Ms Mehataj Syed and Mr Busam Gopichand have culminated in this significant publication, which not only adds to the body of knowledge in the field but also showcases the talent and dedication of the researchers at the department.
This achievement highlights the commitment to excellence and innovation within the Department of Electrical and Electronics Engineering, positioning it as a hub for cutting-edge research and academic prowess. The impact of this research is expected to reverberate across the industry, contributing to advancements in LED lighting technology and its applications.
The publication of this paper underscores the quality and rigour of the research solidifying their reputation as leaders in the field. This accomplishment is a testament to the department’s commitment to pushing boundaries and making meaningful contributions to the field of electrical engineering.
Congratulations to Dr Ramanjaneya Reddy, Ms Mehataj Syed, and Mr Busam Gopichand on this remarkable achievement, and we look forward to seeing the continued impact of their research in the field.
Abstract
This work proposes a three-leg asymmetrical voltage resonant converter for multiple load Light Emitting Diode (LED) lighting applications. The proposed converter is developed with a common leg-1 for both load-1 and load-2. The load-1 is powered from asymmetrical voltage between leg-1 and leg-2. Similarly, load-2 is powered from asymmetrical voltage between leg-1 and leg-3. The proposed circuit provides the following major contributions: (1) Independent dimming control of LED loads; (2) Zero Voltage Switching (ZVS) of all power switches; (3) High efficiency; and (4) Asymmetrical voltage regulation. To achieve independent dimming control, the voltages between legs are made zero by dimming leg-2 and leg-3 independently. Two resonant circuits are connected in the proposed circuit. Owing to this all the power switches operate with ZVS, which reduces the switching losses. Further, two LED lamps are connected in series with battery sources to supply the threshold voltage to lamps which in turn results in a lower power processing of the converter.
Explanation of Research in Layperson’s Terms
This work proposes a three-leg asymmetrical voltage resonant converter with independent dimming control for multiple load LED lighting applications. The proposed converter drives multiple loads independently with a dimming feature. The converter is developed with leg-1 is common for both LED loads. The major contributions of the proposed LED driver are independent dimming control, asymmetrical voltage regulation, zero voltage switching of all the power switches, and high efficiency. The threshold voltage of LED loads is supplied by batteries connected in series with LED loads, which will help in lower power processing of the proposed converter. Further, due to soft switching technology implemented in this converter, it reduces the losses in the system considerably increasing efficiency.
Title of Research Paper in the Citation Format
A Three Leg Asymmetrical Voltage Resonant Converter with Independent Dimming Control for Multiple Load LED Lighting Applications.
Citation: Ramanjaneya Reddy Udumula, et. al, “A Three Leg Asymmetrical Voltage Resonant Converter with Independent Dimming Control for Multiple Load LED Lighting Applications,” IEEE Transactions on Industry Applications, Feb 2024. doi: 10.1109/TIA.2024.3363676
Practical and Social Implementation of Research
To achieve effective and efficient use of energy resources under the sustainable development goals, Light Emitting Diodes (LEDs) have emerged as a global lighting industry solution. Over the conventional lighting sources such as incandescent lamps, fluorescent lamps, and high intensity discharge lamps, LEDs are i) more efficient, ii) eco-friendly due to absence of toxic gases, iii) have longer life span up to one lakh year, iv) high luminous intensity and v) good colour rendering index. LED’s requires low voltage direct current supply and the V-I characteristics of LEDs which is like Shockley diode represents the exponential growth of current over a small voltage variation which may damage the LED or effects the illumination. Hence, an LED driver is necessary in an LED system to supply LEDs with constant current. DC fed LED drivers are more reliable due to absence of AC-DC conversion stage and power factor correction stage which are crucial in AC fed LED drivers. Therefore, DC fed LED drivers are paid more attention in recent times in the majority of battery-powered/solar-powered applications. Given its features of high power, exceptional efficiency, cost-effectiveness, and flicker-free operation, this innovation is well-suited for streetlight/stadium lighting applications.
Collaborations
Dr. Kasi Ramakrishna Reddy, Assistant Professor
Department of Electrical and Electronics Engineering, Vasavi College of Engineering, Hyderabad
Future Research Plans
The future work is on PV/battery fed LED driver topologies suitable for streetlighting/stadium lighting applications with low component count, high efficiency, reduced device stress, and flicker free lighting system
- Published in Departmental News, EEE NEWS, News, Research News
Advances in Electric Vehicle Technology: A Study on Bi-Directional Converters
Electric Vehicles are in vogue today, thanks to the heightened environmental concerns, greater availability of models, increased cost competitiveness and improved vehicle ranges. To contribute to the growing field of electric vehicle technology, Assistant Professors, Dr Tarkeshwar Mahto, Dr Somesh Vinayak Tewari and Dr Ramanjaneya Reddy from the Department of Electrical and Electronics Engineering at SRM University-AP along with the research scholar, Ms K Mounika Nagabushanam, conducted a study and published a research paper titled “Development of High-Gain Switched-Capacitor Based Bi-Directional Converter for Electric Vehicle Applications.” The team’s research focuses on creating a bi-directional DC-DC converter that enables power flow from the battery to the motor and vice versa while maintaining necessary voltage gains and ensuring improved efficiency and low cost.
Abstract
High efficiency, high voltage transfer ratio (VTR), and low input ripple current are required in any bidirectional DC-DC converter (BDC) that plays a major role in interfacing batteries in applications like DC microgrids and electric vehicles (EVs). To meet these requirements, a switched capacitor-based BDC is proposed to interface the battery with a propulsion system via a DC Link. It has a simple circuit with only a set of switching operations, High VTR, and lesser ripple current on the low voltage (LV) side, which are advantages of the proposed High Gain Switched-Capacitor Bi-directional DC-DC Converter (SC-BDC), making it appropriate for use in EVs. The steady-state analysis, design consideration of passive components, loss and efficiency analysis are presented. Finally, the proposed High Gain SC-BDC is compared with a few of the existing BDCs in the literature. The feasibility of the converter was demonstrated by simulating a 200 W converter and validating results produced in a MATLAB environment.
Practical implementation of your research or the social implications associated with it.
The developed converter can be used in Electric Vehicle for integration of battery to traction motor.
Collaborations.
1. Majed A. Alotaibi, Department of Electrical Engineering, College of Engineering, King Saud University, 11421, Saudi Arabia.
2. Hasmat Malik, Department of Electrical Power Engineering, Faculty of Electrical Engineering, University Technology Malaysia (UTM), Johor Bahru 81310, Malaysia.
3. Fausto Pedro García Márquez, Ingenium Research Group, Universidad Castilla-La Mancha, 13071 Ciudad Real, Spain.
As part of their future research plans the team plans of working on noise reduction methods that are brought on by regeneration action and to incorporate various control techniques to keep the DC link voltage of the propulsion system constant.
We wish the team all success in their future endevours!
- Published in Departmental News, EEE NEWS, News, Research News
Dr. Tewari receives Homi Bhabha National Institute’s Outstanding Doctoral Student Award
Dr. Somesh Vinayak Tewari, Assistant Professor, Department of Electrical and Electronics Engineering (SRM University AP) was awarded the prestigious “Outstanding Doctoral Students Award”, from Homi Bhabha National Institute (HBNI) at an event held at the Department of Atomic Energy (DAE) Convention Centre, Anushaktinagar, Mumbai. Dr. Tewari was presented this award for his PhD thesis titled “Study of surface flashover of insulator in gases at high pressure.”
- Published in Departmental News, EEE NEWS, News
Online adaptive fast output voltage tracking in DC power supply system
Remarkable research of Dr. Tousif Khan N is honoured with APJ Abdul Kalam Memorial International Travel Award
SRM University AP, Andhra Pradesh faculty, Dr. Tousif Khan N, Assistant Professor and Head of the Department, Department of Electrical and Electronics Engineering, is to present a paper “Laguerre Neural Network Driven Adaptive Control of DC-DC Step Down Converter” in the renowned International Federation for Automatic Control (IFAC) World Congress to be held in Germany during July 12-17, 2020. Further this research article is also selected for the prestigious APJ Abdul Kalam Memorial International Travel Award by the Automatic Control and Dynamic Optimization Society (ACDOS) chaired by Professor Ravi Gudi of Indian Institute of Technology Bombay.
The research work of Dr. Tousif proposes a novel Laguerre neural network estimation technique for the approximation of unknown and uncertain load function, followed by its subsequent compensation in the adaptive backstepping controller. A detailed design of the proposed estimator and adaptive backstepping controller along with closed loop asymptotic stability have been presented. Further, the proposed control mechanism is evaluated through extensive numerical simulations while subjecting the converter to input voltage, reference voltage, and load resistance perturbations. Furthermore, the results are verified by testing the proposed controller on a laboratory prototype with DSP based TM320F240 controller board. The analysis of results reveals that the proposed control methodology for DC-DC step down converter offers a faster transient output voltage tracking with smooth and satisfactory inductor current response over a wide operating range. Dr. Tousif informs, “Under the class of DC-DC converters, the dynamics of DC-DC step down converter are nonlinear in nature and are largely influenced by both parametric and unanticipated external perturbations. In its closed loop operation, obtaining a precise output voltage tracking besides satisfactorily inductor current response is a challenging control objective. Hence, in this regard, this article proposes a solution.”
Electric power supply is the principal entity behind any electrical circuits and systems. Irrespective of their function in the digital domain, these circuits necessarily require a reliable and efficient energy source for their operations. Among the two existing forms of electrical energy, namely, the direct current (DC) and the alternating current (AC), the DC power finds wide use in numerous applications in the field of telecommunication, instrumentation, medical electronics, aerospace, defence and power transmission.
Ever since the fundamental innovations in DC systems by Thomas Alva Edison in 1880, DC rectification, and modulation method have remained central to various utilities. During the initial years, DC power conversion primarily resorted to the use of vacuum tube technology in delivering a desirable level of voltage from an AC source. The rectification stage was subsequently followed by filtering of the voltage at the output end. Nonetheless, the vacuum tube technology supported very low current density and featured a high ripple content in the DC voltage. Additionally, the output voltage was inconsistent or rather unregulated, making it inappropriate for DC power operated electrical and electronic systems. Much later in 1967, integrated series regulators were developed which eventually became popular as linear power supplies (LPS). Such a classical DC power generation method involved an AC transformer, AC-DC rectifier, and a voltage regulator in its assembly. The transistors in LPS operate under active region and dissipate large amounts of heat due to the voltage drop while high current flows through the collector-emitter junction, thereby causing substantial power loss and a very low energy efficiency. Even though they characterize the low level of noise and find better suitability in audio applications, yet their critical limitations of huge size, heavy weight and high cost make them infeasible for use in portable electronic devices.
In tandem to these aforementioned developments, the advancements in power semiconductor technology led to the invention of low cost reliable power switches exhibiting fast switching response. This proved to be instrumental in building an energy efficient switched mode power supply which gradually gained popularity. “Its impact on electrical technology was phenomenal, replacing conventional linear voltage supplies with switched mode power supplies giving rise to enhanced efficiency, light weight, compactness, and comparably lower cost. Such a modern DC conversion system primarily includes DC-DC converters, wherein the rectified input voltage is fed to the DC-DC converter circuits for obtaining specific voltage levels. The primary objective in DC-DC converters is to transfer the energy among different DC circuits functioning at a specific voltage and current levels. This process of energy transfer is performed by temporarily storing the energy from the input source in an operating mode, followed by releasing it in the other operational mode of the converter. Thus, one level of DC input voltage is converted to another level of average DC output voltage at the load end. Meanwhile, the converter being ideal is expected to consume no energy. Any consumption of energy in the converter interface amounts to direct power loss in the overall supply system. Typically, converters render high input-output conversion.”, enlightens Dr. Tousif Khan N. His notable research work offers to mitigate these issues, leading to the venerated APJ Abdul Kalam Memorial International Travel Award. Advancing his work in the future, Dr. Tousif will be closely working on the society’s activities with ACDOS as a member for mutual benefit.
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