Reliability analysis of electric supply including standby generators and uninterruptible power supply system

Abstract

This paper presents a methodology for the reliability analysis of standby and emergency power systems. The techniques are illustrated using an example of standby generators and uninterruptible power supply system.

A benchmark of dynamic reliability methods for probabilistic safety assessment

“…MC and MCDET models are used to compute the reliability parameters for the ESPS (listed in Table VII) to be compared with those obtained with Markov methods [17]: frequency ( ) and duration ( ) of failure of the utility-generator subsystem, frequency ( ) and duration ( ) of power loss at bus A, and frequency ( ) and duration ( ) of power loss at CLB estimated confidence intervals (i.e., estimated values ± standard deviation) are all bounding the values calculated in [17], confirming the capability of MC and MCDET of effectively modelling the system dynamics.…”

“…A sketch of the system is shown in Fig. 12 [16,17]. The power is normally supplied by the UIP while two generators (G1 and G2) are kept in cold standby mode, with probability of failure on demand equal to 0.015.…”

“…13. The reliability analysis of the ESPS system is made by the MC method, the Markov method and minimal cut set method, respectively in reference [16] and [17]. In this work, we benchmark the results with those that we obtain with MC and MCDET models.…”

“…The methods of MC, DET and MCDET are the most popular ones. This paper analyzes critically these latter methods by applying them to a classic level control dynamic system of literature [13][14][15] and to a realistic Emergency and Standby Power System (ESPS) [16,17] drawing some conclusions on their strengths (i.e., accuracy) and weaknesses (i.e., computational demand and model complexity) for practical application.…”