Reliability Assessment and Study the Effect of Substation Feeder Length on Failure Rate and Reliability Indices
Mandefro Teshome,
Fsaha Mabrahtu
Issue:
Volume 9, Issue 3, May 2020
Pages:
41-46
Received:
17 February 2020
Accepted:
5 March 2020
Published:
17 August 2020
Abstract: Today, utilities are trying to maximize system reliability, improve efficiency, and reduce costs by using protection system, distributed generation system, by reconfiguring the feeder, by connecting the end of feeder to other substation and so on. However, when it tries to use some techniques (reconfiguring the feeder, connecting the end of the feeder to another substation); the techniques have positive and negative impact on reliability improvement. The substation which is taken in this paper has the System Average Interruption Frequency Index (SAIFI) and System Average Interruption Duration Index (SAIDI) is 521.46 interruptions per customer per year and 446.82 hours per customer per year respectively. The historical outage interruption data of the years of 2016-2018 has been used as a base year. The study has evaluated the new substation to improve the system reliability. The simulation results have been done with the help of Electrical Transient Analysis Program (ETAP 12.6) software. In this paper includes improvement of the system reliability of the feeder is supplied from two substations or new substation should be connected at the end of the feeder. Due to the new substation, the length of the feeder will vary, and the variation of the feeder has significant effect on power reliability. The value of SAIFI and SAIDI after the new substation connected is 169 and 96 respectively. Since the new substation has negative impact, the value of indices is not reduced more.
Abstract: Today, utilities are trying to maximize system reliability, improve efficiency, and reduce costs by using protection system, distributed generation system, by reconfiguring the feeder, by connecting the end of feeder to other substation and so on. However, when it tries to use some techniques (reconfiguring the feeder, connecting the end of the fee...
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Co-supplying the National Grid: An Assessment of Private Off-grid Electricity Generation in Juba-South Sudan
Ladu David Morris Lemi,
Michael Carnegie La Belle
Issue:
Volume 9, Issue 3, May 2020
Pages:
47-59
Received:
2 July 2020
Accepted:
8 August 2020
Published:
19 August 2020
Abstract: Despite the global campaign for energy transition towards renewable sources, South Sudan's electricity generation is exclusively diesel-based with an installed capacity of 12MW in Juba against 154MW demand. Persistent power outages have led to a rise in off-grid electricity self-generation using diesel generators. This study explored the available electricity generation options in Juba, quantified the off-grid electricity, and assessed the electricity market system dynamics through a survey involving 44 companies, 2 government institutions, and 2 solar energy retailers. The study found that the current off-grid installed generation capacity in Juba is higher than the on-grid with a total of 28.93MW from 142 generator-sets. 98% of this amount is diesel-fired and 2% is from solar. Running these generators for a month cost the companies US$ 533,204 on 589,760 liters of diesel, and the combustion of this fuel results in 1553.8 tCO2e emissions. Knowledge of solar energy adoption was low and showed a mixed perception with most companies having no/limited knowledge. Besides, the governance of the electricity market is monopolized by a government utility company without legal frameworks. The study recommends restructuring the electricity market to attract private players by developing legal frameworks and the creation of awareness for the promotion of solar energy.
Abstract: Despite the global campaign for energy transition towards renewable sources, South Sudan's electricity generation is exclusively diesel-based with an installed capacity of 12MW in Juba against 154MW demand. Persistent power outages have led to a rise in off-grid electricity self-generation using diesel generators. This study explored the available ...
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