Browsing by Author "Msigwa, Consalva Joseph"

Now showing 1 - 4 of 4
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    DC Voltage Regulation of Solar PV/Wind and Biofuel System Incorporating Battery Storage
    (University of Dar es Salaam, 2021-11-12) Juma, Mwaka Ismail; Mwinyiwiwa, Bakari Mohammedi Mfaume; Msigwa, Consalva Joseph; Mushi, Aviti Thadei
    Tanzania has several places which lack the access to grid. These areas can be powered by utilizing hybrid energy systems (HES) such as solar photovoltaic, wind, and biodiesel. However, such a system produces voltage control challenges at the DC bus due to stochastic nature of those sources, if battery is not coupled. Therefore, this paper first proposes a HES that is coupled to a battery. Secondly, it proposes a control that can regulate the three sources of energy such that the DC bus is maintained at 750 V. Simulation results have shown that a conventional proportional and integral controller can achieve DC bus voltage regulation for the system proposed in this paper regardless of irradiance variation, wind speed variation, or the load variation. This type of energy sources is feasible for use in rural arrears of Tanzania.
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    Design of a Hybrid Energy System with Energy Storage for Standalone DC Microgrid Application
    (Multidisciplinary Digital Publishing Institute, 2021-09-21) Juma, Mwaka Ismail; Mwinyiwiwa, Bakari Mohammedi Mfaume; Msigwa, Consalva Joseph; Mushi, Aviti Thadei
    This paper presents microgrid-distributed energy resources (DERs) for a rural standalone system. It is made up of a solar photovoltaic (solar PV) system, battery energy storage system (BESS), and a wind turbine coupled to a permanent magnet synchronous generator (WT-PMSG). The DERs are controlled by maximum power point tracking (MPPT)-based proportional integral (PI) controllers for both maximum power tracking and error feedback compensation. The MPPT uses the perturb and observe (P&O) algorithm for tracking the maximum power point of the DERs. The PI gains are tuned using the Ziegler–Nichols method. The developed system was built and simulated in MATLAB/Simulink under two conditions—constant load, and step-load changes. The controllers enabled the BESS to charge even during conditions of varying load and other environmental factors such as change of irradiance and wind speed. The reference was tracked extremely well by the output voltage of the DC microgrid. This is useful research for electrifying the rural islanded areas which are too far from the grid.
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    Grid Connected PV-Wind Energy System for Luxmanda Village in Tanzania
    (University of Dar es Salaam, 2021-11-12) Fungo, Lucy Joseph; Mushi, Aviti Thadei; Msigwa, Consalva Joseph
    There are rural areas in Tanzania which still lack access to the national grid. One of such locations is Luxmanda village in Manyara region. This village gets its power from islanded renewable energies microgrid (MG) which is able to supply about 25.4 kW. However, this is way below the projected consumption. Therefore, this paper proposes connecting the islanded MG to the grid to supply enough power to the village for prosperity. The paper discusses the solar photovoltaic generation, wind generation and the DC grid. Steady state operating of the MG is established at 750 V DC.
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    MPPT DC-DC Buck-Boost Converter for Off Grid Hybrid Solar-Wind-Battery System in Ikuza Island, Tanzania
    (Tanzania Journal of Engineering and Technology (TJET), 2023-11-14) Nassoro, Nassoro Sadick; Msigwa, Consalva Joseph; Mushi, Aviti Thadei; Mwinyiwiwa, Bakari M.M.
    Ikuza Island in Kagera-Tanzania faces lack of electricity due to cost challenges of extending the grid by marine cables and other transmission facilities. These makes such endeavour not appealing to the supply authority due to those higher charges. Therefore, this paper undertakes to design hybrid renewable energy sources for the island by specifically focusing on the buck-boost converter for the energy conversion from these renewable resources. The design of the bidirectional buck-boost converter for maximum power point tracking in off-grid hybrid renewable energy systems is multifaceted due to the inhomogeneity nature of the renewable energy sources. The bidirectional buck-boost converter, solar PV, wind-based generator, and energy storage system are designed and simulated in MATLAB/Simulink software. The designed system is tested with varying solar irradiance (750 to 1000 W/m2), temperature (20 to 25C) and wind speed (150 to 157.5 radians/s) at constant load of 260 A while load variation involved varying the load current from 0 to 260 A at solar irradiance, temperature, and wind speed of 1000 W/m2, 25 C and 157.5 radians/s, respectively. The variation of DC link bus voltage at different load conditions is reported. The simulation results show that the designed converter is able to maintain DC link voltage at 600 V. Moreover, the DC link voltage shows a maximum drop of approximately 0.67% during the constant load condition. Contrarily, a significant improvement is observed when the designed converter operates with the hybrid system of solar PV, PMSG-based wind generator and with energy storage system.