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Research Publications (Engineering and Built Environment)

Permanent URI for this collectionhttp://ir-dev.dut.ac.za/handle/10321/215

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Author: search.filters.author.Akinyemi, Ayodeji StephenHas files: Yes

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    Enhancement of solar PV output error under variable irradiation and temperature using an improved regulation strategy
    (IEEE, 2022-08-22) Akinyemi, Ayodeji Stephen; Kabeya, Musasa; Davidson, Innocent Ewaen
    A Photo-Voltaic Solar System (PVSS) is being operated in Steve Biko campus, Durban University of Technology. The energy generated by the PVSS is time varying, based on the quantity of sunlight and the temperature at which the photovoltaic (PV) cell functions. Consequently, in all situations, it is critical to obtain the full power from the PV array. The monitoring control strategy of Maximum Power Generated (MPG) from the PVSS connected to a Boost Inverter (BI) is presented in this research paper by employing an Improved Incremental Conductance and Integral Regulator (IIC & IR). The outcomes of the simulation indicate that full power can be obtained from the PV array while ensuring a consistent generated voltage under various operating scenarios.
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    Analysis of voltage rise phenomena in electrical power network with high concentration of renewable distributed generations
    (Springer Science and Business Media LLC, 2022-12) Akinyemi, Ayodeji Stephen; Musasa, Kabeya; Davidson, Innocent E.
    The increasing penetration levels of renewable distributed generation (RDG) into a power system have proven to bring both positive and negative impacts. The occurrence of under voltage at the far end of a conventional electrical distribution network (DN) may not raise concern anymore with RDGs integration into a power system. However, a penetration of RDGs into power system may cause problems such as voltage rise or over-voltage and reverse power flows at the Point of Common Coupling (PCC) between RDG and DN. This research paper presents the impact of voltage rise effect and reverse power flow constraint in power system with high concentration of RDG. The analysis is conducted on a sample DN, i.e., IEEE 13-bus test system, with RDG penetration by considering the most critical scenario such as low power demand in DN and a peak power injection by RDG. For studying the impact of voltage rise and reverse power flow, a mathematical model of a DN integrating RDG is developed. Furthermore, a controller incorporating an advance control-algorithm is proposed to be installed at PCC between DN and RDG to regulate the voltage rise effects and to mitigate the reverse power flow when operating at a worst critical scenario of minimum load and maximum generation from RDG. The proposed control strategy also mitigates the voltage–current harmonic distortions, improves the power factor, and maintain the voltage stability at PCC. The simulations are carried out using MATLAB/Simulink software. Finally, recommendations are provided for the power producers to counteract the effects of voltage rise at PCC. The study has demonstrated that, voltage at PCC can be sustained with a high concentration of RDG during a worst-case scenario without a reverse power flow and voltage rise beyond grid code limits.