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New reliability and control concepts
Published in Fred I. Denny, David E. Dismukes, Power System Operations and Electricity Markets, 2017
Fred I. Denny, David E. Dismukes
At the power distribution system level, a number of indices have been defined for assessing reliability. The system average interruption duration index, or SAIDI, provides a measure of the average length of time that customers are without power. SAIDI is normally expressed in minutes per year. The system average interruption frequency index (SAIFI) is closely related to SAIDI. SAIFI provides a measure of the number of times when customers lose power. SAIFI generally is expressed in terms of the average number of outages per year. The customer average interruption duration index (CAIDI) is still another index that may be calculated by dividing SAIDI by SAIFI. Alternatively, CAIDI may be directly calculated as the average length of time when customers are without power each time there is a power supply interruption. CAIDI is usually expressed in minutes.
Reliability and Sensitivity Analysis for Closed-Ring Distribution Power Systems
Published in Electric Power Components and Systems, 2022
Mohammed Wadi, Mustafa Baysal, Abdulfetah Shobole
Once again, based on LPs indices, the overall system indices can be computed. The SAIFI is defined as the ratio of total number of customer interruptions to the total number of customers served. The SAIDI is defined as the ratio of total customer interruption duration to the total number of customers served. The CAIDI is defined as the ratio of the total customer interruption duration to the total number of customer interruptions. The ASAI is defined as the ratio of the customer available service to the customer demand. The computation formulas are given in (4), and (5) [29]. The Expected Energy not Supplied (ENS) is defined as the sum of product of average LP demand and the average outage time (U) per year, and AENS is defined as the expected ENS divided by the total number of customers served, computation formulas as given in (6) [30]: where is the number of customers at 8760: is the total number of hours per year, is the average load at