Browsing by Author "Mohsin Ali"

Now showing 1 - 6 of 6
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    Design and Hardware Implementation of DC-DC Converter and DC-AC Inverter
    (University of Management & Technology, 2018) Mohsin Ali; Mukaram Ayaz; Hamza Ali
    As the conventional energy resources are declining day by day, the world trend is shifting towards renewable energy resources. Solar energy is one of the major sources of providing cheaper and cleaner energy, but this energy comes at a cost. To extract energy from photo-voltaic panel, power electronic based conversion system is designed which would efficiently convert varying dc power into stable ac power. To achieve this task, PWM based converter and inverter are designed employing high frequency, which significantly reduce component size and cost, but this comes at a cost of increased noise and switching losses. In remedy to these issues magnetic components are designed on ferrite cores. Initially varying DC voltages of range 20-45 volts from PV panel are converted to stable DC 15 volts in full-bridge DC-DC converter with less than 1 percent variation, employing feedback of type-II compensator. These stable voltages are then converted to single phase AC with constant 50 Hz frequency and RMS value of 220 volts in PWM based square wave inverter. The switching frequency of 25 kHz is used in converter and of 50 Hz in inverter. All aim, calculations, tests, data and conclusions have been documented with in this report. As the converter is based on high frequency switch mode design, it accounts for all the shortcomings of the linear power supplies. PWM based square inverter is made of simple design employing low frequency to justify cost and complexity. Special high frequency transformer and inductors are designed in converter to provide safety in terms of isolation and filter design and to store energy operating in continuous conduction mode. To reduce noise in converter opto-coupler and decoupling capacitors are used. Comprehensive and state of the art design resulted in a much smaller, lighter, cheaper and efficient energy conversion mechanism which would ultimately increase the use of solar energy in lives of people and would also help them get rid of load-shedding and would promote green energy. Realizing the fact that sudden change in load and input voltages would bring bunch of harmonics comprising a large range of frequencies, hence a feedback design ensures stability conditions using conventional control techniques employing bode plot and root locus. Results are tolerable and gives variations of less than 2 % in voltages and less than 1 % in frequency giving constant frequency of 50 Hz. Rise time, settling time, overshoot, damping all are in desirable limits. Total Harmonic Distortion in current waveform is less than 15 %.
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    Prototype for advance metering infrastructure (ami) for demand side management
    (UMT.Lahore, 2018) Ghulam Hassan Warraich; Noman Liaqat; Hassan Mohyuddin; Mohsin Ali
    Automatic Meter Reading system (AMR) continuously checks the working of meter and sends information on demand of specialist organization through SMS. It spares immense human work. The information got from the smart meter is displayed in database server which was situated at power providing company through SMS portal for additional handling by power supplying company. The innovation of e-metering (Electronic Metering) has experienced quick technological changing and there is increased interest for a dependable and proficient Automatic Meter Reading (AMR) system. This report displays the plan of a basic minimal effort remote GSM power meter and its related web interface, for automatic charging of power and dealing with the gathered information all around the power systems. The proposed framework replaces conventional meter reading strategies and empowers remote access of existing energy meter by the power supplier. Additionally they can screen the meter readings frequently without the individual going by each house. A GSM based remote correspondence module is incorporated with electronic energy meter of every power user to have remote access over the utilization of power. A computer with a GSM collector at the opposite end, which contains the database acts as the billing point. Live meter reading from the GSM module energy meter is sent back to this billing point periodically and these details are updated in a central database from which the power provider can check the bills of every user. Another easy approach is to establish a web page where the information of every user is displayed. Information regarding voltage, current, units consumed and the amount of bill which has to pay is displayed. Consumers and power supplying company can access this information very easily.
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    Smart glasses with audio aid for visually impaired and blind persons
    (UMT.Lahore, 2019) Mohsin Ali; Farrukh Diaf; Ahmed Akram
    The assistive innovation is a standout amongst the most fundamental and vital framework that helps an individual with a handicap to work around his challenges.This paper exhibits the text reader,money recognition and person’s emotion identification for visually impaired individuals, created on Raspberry Pi with the help of Image processing techniques.The money recognition and person’s identification is done through train model(database).Person’s emotion is real time.Text reading and money recognition is done through still images. It employments the Optical character recognition innovation for printed character identification using Pi camera and computer programming.It changes over pictures of composed and printed content into machine encoded content.In this project these pictures are changed over into the sound yield (Speech) using OCR and Text-to-Speech synthesis Pyttsx3.The change of printed archive into text documents is done utilizing Raspberry Pi which again utilizes Tesseract library library and Python programming. The text file is handled by OpenCV library and python programming language and sound yield is accomplished.
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    Study the process flow of garments manufacturing & workout to reduce sewing process wastage
    (UMT Lahore, 2017) Shazif Hussain; Mohsin Ali
    Sewing is an important process of Garments manufacturing industry. Faults occurring during production severely affect the quality and efficiency of garments. Their repair also increases the production cost and time consuming. The target of this project is to analyze the sewing faults which mostly occur during production process of Denim garments and finally to make suggestions for their rectification, improving quality and minimizing the repair costs. In this study, we observed the two assembly lines of sewing process. We checked the faults occurring in small parts section, front & back section as well as the assembly section. The machinery, execution techniques of operators were observed and in inspection section and quality check after sewing process, where all garments are inspected, a number of different faults were observed. But some major faults which were causing about half of rejections were studied, and after discussions their remedies were suggested. Their practical implications were also studied after implementation.
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    Transformer less design of polymer exchange membrane fuel cell based uninterruptable power supply
    (University of Management and Technology, 2013) Mohsin Ali
    This research work presents a transformer less model of fuel cell powered uninterruptable power supply (UPS). The design consideration of this research includes the utilization of Polymer Exchange Membrane Fuel Cell ( PEMFC) market available stack model and designing of an efficient, low loss, cheap and high power design of a transformer less inverter model for 6kW UPS. This model is controlled with the help of embedded controller which ensures ripple and glitch free voltage regulated inverter providing pure sine wave as an output. This efficient inverter uses high frequency ferrite core transformer which would have a very small size and high efficiency. This model also ensures a very low total harmonic distortion. The proposed model utilizes a super capacitor module to overcome the electric transient conditions for the instantaneous power fluctuation, slow dynamics of the fuel cell and idealizing the overload response. Finally with synchronization techniques this UPS is connected to AC supply mains, also the calculations of fuel required for one hour continuous operation of 6kW UPS is formulated. The model proposed in this research work is implemented in MATLAB – SIMULINK environment.