Browsing by Author "Eze, Val Hyginus Udoka"

Now showing 1 - 5 of 5
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    Design and implementation of a DC to AC power electronics-based inverter that produces pure sine wave output for critical engineering applications
    (International Journal of Recent Technology and Applied Science, 2024-02-17) Mubeezi, Conceptar; Kalyankolo, Umaru; Eze, Val Hyginus Udoka; Okafor, Wisdom O.
    Power inverters play a crucial role in the field of engineering, particularly in applications where power stability is imperative. In devices such as Uninterruptible Power Supplies (UPS), the conversion of raw power to DC, subsequent filtering, and inversion to AC are executed through pure sine wave inverters. These inverters exhibit remarkable stability, making them ideal for powering sensitive equipment like data switches and Remote Terminal Units (RTUs). This study delves into the intricate process of converting DC power into a pristine sine wave signal. The heart of this power conversion lies in the utilization of the KA3525A integrated circuit (IC) in conjunction with MOSFETs of the PN55 series, supported by capacitors and resistors for effective power filtration. The KA3525A, a monolithic IC, encompasses all essential control circuits for a pulse width modulating regulator. Within this IC, a voltage reference, error amplifier, pulse width modulator, oscillator, under-voltage lockout, soft start circuit, and output driver collaborate seamlessly. The MOSFETs function as switches, synchronized with the oscillating signal from the KA3525A IC. This coordination, combined with the filter and other signal conditioning units, enables the conversion process. The design achieves the conversion of raw power into a stable pure sine wave signal of 170V AC at the H-bridge terminals, demonstrating the success of the designed approach.
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    The differences between single diode model and double diode models of a solar photovoltaic cells: systematic review
    (Journal of Engineering, Technology & Applied Science, 2023-08-21) Eze, Val Hyginus Udoka; Kalyankolo, Umaru; Edozie, Enerst; Nafuna, Ritah; Nansukusa, Yudaya
    This research paper systematically reviewed and investigated single diode model and double diode model of a solar photovoltaic systems in terms of accuracy, differences under major unknown PV parameters, different optimization and fabrication. This research paper reviewed the differences and the similarities between the single diode model and double diode model. From the review, it was clear that single diode model has less computation time and number of unknown parameters compared to double diode model. The double diode model on its own superiority is more accurate under solar shading condition effect than single diode model but single diode model performs better under high insolation levels. None of the two models is superior than the other but the solar photovoltaic modelers/installers should bear the solar irradiance of the environment before installation.
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    Modeling and implementation of a hybrid solar-wind renewable energy system for constant power supply
    (Journal of Engineering, Technology & Applied Science, 2024-08-10) Conceptar, Mubeezi; Kalyankolo, Umaru; Eze, Val Hyginus Udoka; Migisha, Jim; Asikuru, Salama; Nassaga, Musa; Ochima, Noah; Okafor, Wisdom
    In recent years, Uganda has significantly increased the use of renewable energy sources, particularly solar and wind power. These energy sources are especially crucial in rural and remote areas where connecting to the national grid is challenging. Renewable Energy Sources (RES) have proven to be cost-effective alternatives to traditional energy sources, which often require substantial investments in transmission and distribution networks. This study focuses on designing and implementing a hybrid renewable energy system that integrates both solar and wind power. The research successfully established a reliable and continuous power supply for the community through the combination of wind and solar energy. The hybrid power generation system operates by simultaneously monitoring solar and wind energy using an ACS712 current and voltage sensor. Controlled by a microcontroller, the system employs dual-channel relay switches to activate the power source with sufficient energy to charge the battery. The programming for this system was conducted using C++ and Arduino software. This study highlights the vast potential within the field of sustainable energy. With rapid and economical electricity production, this hybrid system paves the way toward a greener future, where our energy needs can be met in an environmentally friendly manner.
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    Overview of renewable energy power generation and conversion (2015-2023)
    (Eurasian Experiment Journal Of Engineering, 2023) Eze, Val Hyginus Udoka; Edozie, Enerst; Kalyankolo, Umaru; Okafor, O. Wisdom; Ugwu, Chinyere N; Ogenyi, Fabian Chukwudi
    This paper successfully reviewed the renewable energy trend from 2015 to 2023 based on investment, power conversion and future prospect. From the review it was observed that solar energy is progressively taking the lead as the cleanest energy generator followed by the wind turbine since 2019-2023. It also detailed the overview of solar photovoltaic technologies, photovoltaic conversion Efficiency Enhancement and the solar photovoltaic generations which showed that China is the most invested country in renewable energy followed by European union. From this paper it was clear that the renewable energy research trend has shifted to third generation solar photovoltaic (perovskites) and power conversion efficiency enhancement (Maximum Power Point Tracking). Perovskites as the third generational solar cell gives the best energy conversion due to its absorption coefficient, exceptional carrier mobility, high dielectric constant, tunable bandgap, materials abundance and as such recommended for solar installers and other PV designer.
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    Voltage optimization on low voltage distribution transformer zones using batteries in Uganda
    (Journal of Engineering, Technology & Applied Science, 2024-03-07) Kelechi, Edema Simon Iddi; Kalyankolo, Umaru; Eze, Val Hyginus Udoka; Asikuru, Salama; Nassaga, Musa; Ochima, Noah
    In the context of Uganda's rapidly growing energy demands and the need for sustainable solutions, this study explores the implementation of voltage optimization techniques in Low Voltage (LV) distribution transformer zones. The research focuses on the innovative integration of batteries to optimize voltage levels, thereby enhancing the efficiency and reliability of the electrical distribution system. By analyzing real-time data from various LV transformer zones in Uganda, this study investigates the impact of voltage fluctuations on the overall power distribution network. The research methodology involves the design and deployment of battery energy storage systems (BESS) strategically placed within LV distribution transformer zones. These BESS units are utilized to store excess energy during periods of low demand and release it during peak hours, ensuring consistent voltage levels and minimizing losses in the distribution network. The study evaluates the effectiveness of this approach through extensive simulations and on-site experiments, considering factors such as battery capacity, charging/discharging rates, and load variations. A comprehensive cost-benefit analysis is conducted to evaluate the potential financial savings and environmental impact associated with this sustainable energy solution. The findings of this research indicate significant improvements in voltage regulation, reduced system losses, and enhanced reliability in LV distribution transformer zones. Additionally, the study demonstrates the feasibility of integrating batteries into the existing infrastructure, thereby contributing to the optimization of the energy distribution system in Uganda. The outcomes of this research provide valuable insights for policymakers, utility companies, and researchers, emphasizing the importance of embracing innovative technologies to address the energy challenges faced by developing nations like Uganda.