Abstract

AbstractThe purpose of this paper is to predict the reliability parameters of the DC uninterruptible power supply (UPS) by using the reliability block diagram (RBD) method. Application of RBD in predicting reliability of the DC UPS is capable to produce the important quantitative reliability indices such as the system’s failure rates, mean time between failures (MTBF), availability, and unavailability, which will be useful to the UPS designer, manufacturer and finally the user to decide for the best DC UPS configurations. In this paper, two configurations of the DC UPS (with and without generator) are considered, and comparisons on their resultant reliability parameters by using the proposed RBD method are discussed in detail. Sensitivity analysis on the major components of the DC UPS is performed to investigate the effect on the overall reliability of the power systems. Field data from industrial best practice are used to validate the results of the analytical model.KeywordsUninterruptible power supplyReliability block diagramMean time between failures

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