Browsing by Author "Juma, Mwaka Ismail"

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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.