Master of Science in Electrical Engineering

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https://testir.kiu.ac.ug/handle/20.500.12306/1438

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    Experimental design and optimization of frequency and voltage control system in a micro hydro power generating unit using fuzzy logic
    (Kampala International University, School Engineering, 2019-11) Jack, Asinge Weko
    Hydro power plants have been a major source of energy over the years and there have been series of improvement from micro units to large scale units. Irrespective of the great milestones achieved in generation of electrical energy through hydro power plant, there have also been challenges confronting these means of power generation amidst which include voltage and frequency instabilities. This research work used fuzzy logic control algorithm in order to contribute to Micro Hydro Power Plants stability and dynamic performance improvement. Its effectiveness was shown through a comparative analysis to Conventional Controllers simulated in Matlab/Simulink 2018a. Both controllers were subjected to dynamic performance tests in order to evaluate their respective transient, performance stability and robustness responses in a designed Micro Hydro Power Plant. Results revealed that Fuzzy Logic Controller reduces the response time from 8.23s to 3.32s (improvement of 4.91s averaged over all conducted tests) and provides smaller overshoot with a reduction from 49.65% to 35.54% (improvement of 14.11% averaged over all conducted tests). These results show that Fuzzy Logic Controller has significantly improved the stability and the dynamic performance of the considered Micro Hydro Power Plant.
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    Design and analysis of wireless nanogrid for non-smartphones
    (Kampala International University , School of Engineering and Applied Science, 2018-04) Ekpa, Theophilus Kesaap-Oloom
    This research work designs a wireless power transfer system (WPT) for non smart phones as an alternative to existing wired power supply systems for these devices. Initially, the general concept of known WPT systems and methods are introduced and reviewed. It was noted that most existing WPT models do not consider external interferences in their design even though, it is well known that high frequency circuits may interfere with a WPT system. Additionally till date, existing WPT systems are designed for smart devices only. To ll in this gap, a basic magnetic induction WPT architecture was developed. It consisted of an input driver, inductively coupled transmitter and receiver and a load driver where the load is a non-smartphone. In each stage of the architecture, the e ciencies j􀀀k of the power transfer process are calculated. The inductive coupling is represented by a magnetic circuit in which ex-ternal interferences are modeled as series reluctances. The power ows and e ciency were obtained by Langrangian energy methods. The exibility of the design was demonstrated by the low order of variation in the system e ciency over generalized coordinates of load rotation, displacement and impedance. Comparing the WPT sys- tem designed in this work with [9], a maximum parameter variation over rotation of 1% was obtained. Additionally, an e ective range of 4.5m where [9] had a variation over rotation of 6% and a range of 1m. Finally, the research work recommended that a speci c design incorporating a solar photovoltaic source is introduced to improve the stability and reliability of the wireless power supply system.
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    Design and optimization of w-tailored optical fiber
    (Kampala International University , School of Engineering and Applied Science, 2018-10) Kyevuga, Simon Peter; Kyevuga, Simon Peter
    This research work studies the temperature e ects in W-shaped core refractive in-dex optical ber. The work designs an optimized W-tailored optical ber (OWTOF) that checks the e ect of rising temperatures in W-tailored optical ber (WTOF) for better communication. Initially, an introduction to the general concept of optical bers including tailored optical bers (TOF), temperature e ects and models is pre-sented as a background. This is followed by studies on existing literature on optical bers where a gap is identi ed. The gap is that; temperature rise in communication bers is challenging the use of tailored bers through unnecessary distortion and delay in information. Also, ber design is limited in scope because of existing design practice. Thus the need to optimize bers for better communication. To ll in this gap, a three stage optimization process is designed and a methodology for achieving this optimization for the bene t of telecommunication systems and services is presented. Here, a regularly varying function is introduced in the geometry of WTOF for the temperature parameter leading to the design of the OWTOF. Finally, analytical and numerical simulations covering the performance of the OWTOF in relation to WTOF are stated and proven. Additionally, six re- search questions and remarks are answered. A major result of this work shows that the OWTOF is a better ber for controlling temperature rises than the WTOF at a propagation distance around one unit. Hence, better suited for communication with- out distortion and delay compared to WTOF in this region. Finally, the research work concludes with three recommendations for improving this work for better com- munication.