The Assessment of Reliability Status of Power System Distribution

Abstract

In the era of deregulation of the power sector, it is crucial to devise reliable electricity supply to shield the investment in the industry from negative financial impact on the utility. To ensure that electricity is delivered reliably, then, the substation as a strong nexus for the delivery of electricity must be adequately formidable. In this study, the challenge of poor power delivery is investigated for a typical substation. The Failure Mode and Effect Analysis (FMEA) was adapted for the design of the Risk Priority Number Score software, to reinforce the existing standards mandated for qualitative performance based on IEEE 1366-2000 standard Metrics. The reliability model, herein developed, was tested on the Agbara substation. The system reliability indices were simulated for a period of five (5) years. For further improvement of the network reliability status, the ensuing results inspired the introduction of the Wind Turbine Generators (WTG) which was integrated to the 11kV bus bar. The results obtained from this shows that the reduction in the margin of the energy expected but not supplied (EENS) reduced from 65.316 MW.hr/yr. to 24.555316MWhr/yr in 2018 and from 64.987MWhr/yr to 24.43163MWhr/yr in 2015. Hence, it can be established that the addition of WTG based on the EENS reduction is direct indication of improved reliability of the system which makes the system more reliable.