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I am Ali Mohammed Jobayer, an EE master's student and expecting graduation from the South Dakota School of Mines and Technology in May 2021. Before, I have received my Bachelor's of Science in EEE from Chittagong University of Engineering and Technology(CUET), Bangladesh. In my undergrad, I worked on various Microcontroller based projects. In the first year of my master's program, I have worked on a phase-locked loop for phase converter application using C2000 real-time controllers (TMS320F28075 MCU). During my summer internship 2020, I got an opportunity to work on the control side of a Bidirectional Isolated DC-DC converter (5KW) for solar applications at Phase Technologies LLC, USA. Currently, I am working on Frequency Regulation for Social Events and integration of renewable energy sources in low inertia trending power system. My research interests include Modeling and Control of Power Electronic Converters, power electronics-based power systems, Grid Integration of Renewable Energy Sources, Embedded & Real-time Systems.
Impact of Societal Events on Frequency Stability Considering LED TVs in future Power Systems.
Due to environmental concerns, renewable energy sources (RESs) gradually replace conventional power generations. In the last decade, wind and solar electricity generation have increased from 55 million MWh to 275 million MWh and from 2 million MWh to 96 Million MWh, respectively, in the US. Recently, FERC Order 2222 allows distributed energy resources, including distributed renewable generation and energy storage, to participate in the electricity wholesale market through aggregations. Limited rotating inertia of renewable generation resources results in reduced system inertia, which will increase the rate of change of frequency (ROCOF) due to sudden mismatches of generation and demand. During the high visibility national social event, the brightness of LED TV display put simultaneous demand change in power systems. With the development of slim, tightly packaged, and yearly update features of Smart TV, the penetration of different LED displays climbed rapidly from 9% to 60% in the US during 2012-2019. In this work, the impact of societal events on frequency stability caused by large viewership on LED TVs is discussed. Increasing RESs penetration and FERC order 2222 are considered in this study. The power demand data of a 55-inch LED TV is collected and analyzed to address the problem. This study discusses the frequency stability issue caused by LED TVs in a low inertia power system. It can help system operators to develop frequency control practices accordingly.
Fast and stable phase-locked loop(PLL)
Phase converter synchronization with the grid is a crucial problem due to higher frequency fluctuation in the low inertia trading power system. A phase-locked loop (PLL) is a standard synchronous approach in grid-connected applications that shows robust performance under ideal conditions. However, to improve the steady-state stability during unbalanced and distorted grid conditions, a second-order generalized integrator (SOGI) filter-based synchronous reference frame PLL (SRF-PLL) is proposed. The PLL parameters such as the damping coefficient and natural frequency are designed in such a way to increase the PLL's locking time to correct high-frequency variations. The simulation is performed on the Matlab Simulink platform to verify the theoretical analysis. Finally, the whole experiment is implemented on an Industrial grade DSP to support the proposed system's effectiveness.
Wheel therapy chair: A smart system for disabled person with therapy facility.
Each person in this world desires to live a normal human life, but accidents, diseases, and elder-ship make their desire into disability. Moreover, there are many handicaps and elders, and the number of paralyzed people is increasing day by day. They always need another person to move and have to go under some physical therapies under the guidance of a therapist to recuperate their strain back. In this work, the proposed system helps them move freely & safely and takes a therapist's activities cost-effectively. This system is a combination of different controlling features, can detect an obstacle, and provides few kinds of therapies. A smart wheelchair is developed by using a voice-recognition system to control the movement of the wheelchair and also with Arduino interfaced joystick. Besides, an ultrasound system provides the facility of automatic obstacle detection. The research aims to compact many facilities in a single wheelchair at a low cost.
Design and implementation of 3-lead ECG machine for rural medification.
The number of decease due to Cardiovascular Disease (CVD) in low and middle-income countries has become a significant concern. From a clinical standpoint, the electrocardiogram is a useful mechanism to diagnose cardiac diseases. Therefore, electrocardiogram (ECG) based machine design has been considered to create a framework for building an ECG monitoring system. However, most of the current ECG machines have high prices with bulky shapes, which deprives the people of the remote area to benefit from it. This project aims to develop an intelligent, cost-effective diagnosis system that can provide a reliable diagnosis with better portability. This system has been implemented by instrumentation amplifier with high common-mode rejection ratio and right leg circuit to remove 50 Hz noise of ac main. Digital and analog filtering of the system has optimized the signal by removing baseline wandering and power frequency noise. The communication between the hardware and software is interfaced through a USB port using a microcontroller. This system's implementation shows more significant benefits in domestic health monitoring and rural area's medical camp.
Object Avoider Robot with Industrial Gripper.
The evolution of robotics seems in many ways to mirror the growth of the computer. Today robots can be found in many businesses and practically every major research institution. However, the promise of the common robot envisioned by many prognosticators and authors to exist in the average person's homes and lives has yet to be fully realized in the same way the personal computer has come to be as ubiquitous as the refrigerator. As such, we believe that the next logical step in the evolution of robotics is to place robots in the hobbyists' hands. Additionally, these robots must be robust and flexible enough to spur this next step. We have developed a robot that can grab the required-sized object and avoid other objects over or below the required size. It makes dexterous coordinated movements. It moves without direct human intervention. So, in industry, our robot can automatically search a specific object in any direction. When it finds the object, it grips the object and places the object in the desired place. We used infrared led, photodiode, servo motor, motor driver, a microcontroller (16f877A).