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ID:
115651
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2012.
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| Summary/Abstract |
This paper helps to address the lack of comprehensive, national-scale information on the reliability of the U.S. electric power system by assessing trends in U.S. electricity reliability based on the information reported by the electric utilities on power interruptions experienced by their customers. The research analyzes up to 10 years of electricity reliability information collected from 155 U.S. electric utilities, which together account for roughly 50% of total U.S. electricity sales. We find that reported annual average duration and annual average frequency of power interruptions have been increasing over time at a rate of approximately 2% annually. We find that, independent of this trend, installation or upgrade of an automated outage management system is correlated with an increase in the reported annual average duration of power interruptions. We also find that reliance on IEEE Standard 1366-2003 is correlated with higher reported reliability compared to reported reliability not using the IEEE standard. However, we caution that we cannot attribute reliance on the IEEE standard as having caused or led to higher reported reliability because we could not separate the effect of reliance on the IEEE standard from other utility-specific factors that may be correlated with reliance on the IEEE standard.
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| 2 |
ID:
116725
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| Publication |
2012.
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| Summary/Abstract |
The paper focuses on the evaluation of the economic losses in the industrial sector due to a lack of power quality. The term power quality includes, in general, a set of boundary conditions which allow electrical systems connected to the grid to function as planned. Therefore, the operation of the power system outside these boundaries directly impacts on the economic performance of the whole system. The evaluation of the economical loses derived from this fact has been the subject of several studies, mostly applied to individual cases, with calculation methodologies either too complicated to be applicable, needing a large input of data, mostly dealing with confidentiality issues, or based on particular cases and impossible to extrapolate. The objective of this paper is provide decision makers and authorities responsible of enforcing compensations for losses derived of power quality issues with a relatively easy to apply methodology for calculating the real quantity of these losses. An example of the application of this methodology and an analysis of the results is also provided. The validation of the methodology and its use for different comparison analysis was also carried out. Conclusions are given at the end of the work and further research is proposed.
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