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Faculty of Engineering and Built Environment

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    Reliability and security analysis of the southern Africa power pool regional grid
    (IEEE, 2022-08-22) Ndlela, Nomihla W.; Davidson, Innocent Ewaen
    Over the last decade, Southern Africa has experienced power outages. This is due to insufficient electrical power supply systems, as well as load development in areas that were not sufficiently planned for. The Southern African countries can have a reliable, sustainable, and efficient electrical power grid with the use of power interconnections to exchange power. The primary difficulty with the present grid is to generate electricity using the old electrical infrastructure while also serving loads inside national borders. Most Southern Africa interconnections were implemented in 1995, after the formation of the Southern African Power Pool (SAPP). It was discovered that when electricity interconnection grows larger, the network system becomes more complex. Additionally, power connectors may encounter issues with frequency and voltage control. Numerous Southern African countries are unable to fulfill peak demand within their borders due to population n growth and aging infrastructure, resulting in electrical shortages. This article discusses the results on how to improve grid reliability by controlling voltages with a static var compensator. The remainder of the study discusses an efficient technique for optimizing the current SAPP power network through the use of High Voltage Direct Current Line Commutated Converter (HVDC-LCC) links and as a component of the Flexible AC Transmission System (FACTS)
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    Voltage stability in distribution network
    (2020-09) Masikana Sboniso Brutus; Sharma, Gulshan; Akindeji, Timothy Kayode
    Voltage stability studies and to maintain the flat voltage profile is quite important in order to maintain the healthy operation of electric power network as well as to provide the quality and cheap electric energy to the modern power users. Further with the advancement of power electronics technologies and its application to design flexible alternating current transmission devices (FACTS) have made it easier to alleviate the voltage stability problem in a quicker and cheaper way in the modern DNs. Therefore, this research work shows an attempt to investigate and solve the problem of voltage instability in the distribution network (DN) with the help of FACTS. All buses and lines are calculated in terms of voltage stability index (VSI) and to identify the optimal location of FACTS. The bus or line with minimum voltage profile in terms of VSI are more sensitive to the voltage collapse and it may further lead to blackouts. Hence, the FACTS are permanently installed at the weakest point to enhance voltage profile and improve the voltage stability in the DN. The present study is tested on standard IEEE-15 bus DN and application results are shown to verify the feasibility of the present studies for DN. The beauty and future promise of UPFC in power quality improvement was authenticated on the IEEE-15 bus DN carried out using MATLAB software tool, five different scenarios were considered by increasing the load up to 40% at an interval of 10% from its nominal operating load. With the aim of determining the impact of UPFC on bus voltage and system losses, the load flow analysis was contributed on each scenario with and without UPFC placement in the DN. After UPFC placement there was a significant enhancement of voltages of all busses as well as weakest bus voltage jump from 0.5750 to 0.9750 p.u. and shifting that bus as well as system from voltage instability to stable zone. The active and reactive power loses were decrease by 9.83% and 27.27% that fulfil the beauty of the UPFC installation in the DNs as well as it promise to mitigate the voltage instability problem of the modern DNs
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    Voltage stability enhancement studies for distribution network with installation of FACTS
    (IEEE, 2020-08) Masikana, Sboniso B.; Sharma, Gulshan; Akindeji, Kayode Timothy; Davidson, Innocent E.
    Voltage stability studies and to maintain the Oat voltage profile is quite important in order to maintain the healthy operation of electric power network as wen as to provide the quality and cheap electric energy to the modern power USH S. Further with the advancement of power electronics technologies and its application to design flexible alternating current trans mission devices (FACTS) have made it easier to alleviate the voltage stability problem in a quicker and cheaper way in the modern DNs. Hence, the present research work shows an attempt to investigate and solve the problem of voltage instability in distribution network (DN). All buses and lines are calculated in terms of voltage stability index (VSI) and to identify the optimal location of FACTS. The bus or line with minimum voltage profile in terms of VSI are more sensitive to the voltage collapse and it may further lead to blackouts. The FACTS are permanently installed at the weakest point to enhance voltage profile and improve the voltage stability in the ON. The present study is test on standard IEEE--1 5 bus DN and application results are shown to verify the feasibility of t he present studies for DN