http://dspace.aiub.edu:8080/jspui/handle/123456789/55 Publications Authored By All Faculty Members of Engineering (Department of Architecture, EEE and IP) Tue, 31 Mar 2026 21:05:27 GMT 2026-03-31T21:05:27Z http://dspace.aiub.edu:8080/jspui/handle/123456789/2940 Title: Performance Enhancement of Wireless Power Transfer Systems Through Coil Configuration and Class-E Power Amplifier Integration Authors: Anowar, Tanbir Ibne; Hasan, Kayes; Ahmad, Shameem; Hossain, Tamim; Aridas, Narendra Kumar Abstract: Wireless Power Transfer (WPT) has emerged as a transformative technology for applications ranging from consumer electronics to biomedical devices and electric vehicles. However, achieving efficient power transfer over mid-range distances remains a significant challenge due to coupling variations and impedance mismatches. This study presents a comprehensive investigation into the integration of a modified Class-E power amplifier (PA) with optimized multi-coil configurations to enhance WPT efficiency. A comparative analysis between 3-coil and 4-coil resonant coupling systems focuses on power transfer efficiency (PTE), impedance matching, and adaptive tuning mechanisms. The proposed method leverages an optimized coupling strategy to mitigate power loss and ensure stable transmission. Experimental results demonstrate that the integrated Class-E PA improves PTE by over 20% at mid-range distances, achieving 80% efficiency within 5–30 cm while maintaining low insertion loss. Furthermore, the study highlights the advantages of 3-coil configurations for consumer electronics applications, offering simplified tuning and reduced system complexity compared to traditional 4-coil systems. The findings contribute to advancing high-efficiency WPT systems and their practical implementation in emerging wireless power applications. Unlike previous works that mainly relied on simulation, this study experimentally validates Class-E-driven 3- and 4-coil WPT systems, providing measured ZVS and switch-stress characteristics that demonstrate improved mid-range transfer efficiency. Wed, 11 Feb 2026 00:00:00 GMT http://dspace.aiub.edu:8080/jspui/handle/123456789/2940 2026-02-11T00:00:00Z http://dspace.aiub.edu:8080/jspui/handle/123456789/2939 Title: Design and Analysis of a GSM and GPS-Based Smart Stick for Visually Challenged Persons with Real-Time Location Sharing and Obstacle Detection Authors: Tapu, Md Zahedul Islam; Akter, Nipa; Alam, SK. Nur; Bristi, Sanjida Affrin; Ahmed, Faisal; Bhuyan, Muhibul Haque Abstract: This work presents the design and development of a smart blind stick intended to assist visually challenged individuals by enhancing their navigation and personal safety. The system integrates multiple sensors and modules to create an effective and low-cost assistive device. An ultrasonic sensor is used to detect obstacles in the operator’s path within a range of 50 cm, triggering a buzzer to provide real-time audio feedback. A push-button is included for emergencies; if held for more than one second, it triggers a pre-programmed SOS message to be sent via the SIM800L GSM module. To enhance the accuracy of emergency response and facilitate quick rescue, a GPS module (Neo-6M) is integrated, enabling the system to extract real-time latitude and longitude coordinates and include them in the SMS alert. An Arduino Uno controls the entire system and is powered by a battery pack. This system is effectively simulated in Proteus software. The simulation and experimental performance test results of this work demonstrate that the proposed system addressed the challenges faced by visually impaired individuals. This offers both mobility and emergency communication, making it a valuable contribution to assistive technology. It is low-cost, portable, and scalable for real-world implementation. Description: This work is based on a course capstone project and funded by the students. Thu, 23 Oct 2025 00:00:00 GMT http://dspace.aiub.edu:8080/jspui/handle/123456789/2939 2025-10-23T00:00:00Z http://dspace.aiub.edu:8080/jspui/handle/123456789/2938 Title: Enhancing stability in renewable energy transmission using multi-terminal HVDC systems with grid-forming controls for offshore and onshore wind integration Authors: Shufian, Abu; Hossain, Md. Ismail; Zaman Anonto, Hasanur; Intekhab Rohan, Ahmed Abstract: This paper presents a thorough analysis of two-terminal VSC-HVDC links, and the effects of isolated faults have been extensively studied in multi-terminal HVDC (MTHVDC) networks systems that would enable the interconnection of substantial offshore wind farm energy resources to onshore power systems with emphasis on dynamic transmission performance during different fault and perturbation scenarios. The performance of the system was evaluated against three important scenarios: transient faults, sudden load drops, and wind speed changes. The work presented a comparative analysis of Grid-Following (GFL) and Grid-Forming (GFM) control strategies with a focus on their provisions in offering compliance with grid code requirements, particularly, in faults ride-through (FRT) performance. Transient stability and grid compliance has been performed through the study to take results as the GFM controller performance has been better as compared to GFL controller in the study. The GFM controller recovered more rapidly than its GFL counterpart, achieving voltage stability within 0.5 s and frequency stability within 0.6 s when subjected to fault and load disturbances, versus 1.2 s and 1.8 s for the GFL controller’s voltage and frequency, respectively. The difference in voltage and frequency deviation between the GFL and the GFM system was less than ± 4% and less than ± 0.3 Hz respectively, further verifying that the GFM system far outperformed the GFL system, which demonstrated a voltage stability of ±18% and a frequency stability of ± 0.9 Hz under load disturbance. The results demonstrated the GFM controller’s capability to stabilize power systems rapidly and fulfill grid code requirements even in the presence of compounded disturbances. The virtual inertia and dynamic dampness provided by GFM controller make the system resilient against fluctuations in both wind generation and grid faults. The results highlight the value of GFM-based MTHVDC systems as a dependable option for integrating offshore wind energy into the grid, creating a system with superior stability and efficiency in future large-scale renewable energy systems. Wed, 26 Nov 2025 00:00:00 GMT http://dspace.aiub.edu:8080/jspui/handle/123456789/2938 2025-11-26T00:00:00Z http://dspace.aiub.edu:8080/jspui/handle/123456789/2937 Title: Enhancing stability in renewable energy transmission using multi-terminal HVDC systems with grid-forming controls for offshore and onshore wind integration Authors: Shufian, Abu; Hossain, Md. Ismail; Zaman Anonto, Hasanur; Intekhab Rohan, Ahmed Abstract: This paper presents a thorough analysis of two-terminal VSC-HVDC links, and the effects of isolated faults have been extensively studied in multi-terminal HVDC (MTHVDC) networks systems that would enable the interconnection of substantial offshore wind farm energy resources to onshore power systems with emphasis on dynamic transmission performance during different fault and perturbation scenarios. The performance of the system was evaluated against three important scenarios: transient faults, sudden load drops, and wind speed changes. The work presented a comparative analysis of Grid-Following (GFL) and Grid-Forming (GFM) control strategies with a focus on their provisions in offering compliance with grid code requirements, particularly, in faults ride-through (FRT) performance. Transient stability and grid compliance has been performed through the study to take results as the GFM controller performance has been better as compared to GFL controller in the study. The GFM controller recovered more rapidly than its GFL counterpart, achieving voltage stability within 0.5 s and frequency stability within 0.6 s when subjected to fault and load disturbances, versus 1.2 s and 1.8 s for the GFL controller’s voltage and frequency, respectively. The difference in voltage and frequency deviation between the GFL and the GFM system was less than ± 4% and less than ± 0.3 Hz respectively, further verifying that the GFM system far outperformed the GFL system, which demonstrated a voltage stability of ±18% and a frequency stability of ± 0.9 Hz under load disturbance. The results demonstrated the GFM controller’s capability to stabilize power systems rapidly and fulfill grid code requirements even in the presence of compounded disturbances. The virtual inertia and dynamic dampness provided by GFM controller make the system resilient against fluctuations in both wind generation and grid faults. The results highlight the value of GFM-based MTHVDC systems as a dependable option for integrating offshore wind energy into the grid, creating a system with superior stability and efficiency in future large-scale renewable energy systems. Wed, 26 Nov 2025 00:00:00 GMT http://dspace.aiub.edu:8080/jspui/handle/123456789/2937 2025-11-26T00:00:00Z