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Applied Sciences
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Power System Reliability
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Power System Reliability

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: closed (30 June 2019) | Viewed by 5885

Special Issue Editor

Prof. Dr. Rajesh Karki

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada
Interests: power system reliability; renewable energy; energy storage
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The objective of the modern power system is to ensure the supply reliability at an acceptable cost while meeting environmental compliance. The renewable energy resources are being integrated at different levels of the power system because of their reduced adverse environmental impact as compared to fossil fuel-based resources. However, the increased penetration of these resources has introduced uncertainty and variability in the electric power system, which is a major concern for the system planning and the stable operation of the electric grid. Furthermore, there is a growing interest in the integration of different types of energy storage technologies to cope with the challenges brought by renewable energy resources. Research is being carried out to address the issues emerging from the ongoing changes in the modern power system. This Special Issue aims to present novel approaches for reliable power system planning and operation and the implications of renewable energy resources and storage technologies in power systems, as well as to propose modifications in the existing practices and policies to achieve a reliable and cost-effective sustainable energy system.

Prof. Dr. Rajesh Karki
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (2 papers)

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Research

13 pages, 999 KiB  
Article
Quantifying Power System Operational Reliability
by Nahakul Nepal and Rajesh Karki
Appl. Sci. 2019, 9(14), 2777; https://doi.org/10.3390/app9142777 - 10 Jul 2019
Viewed by 2059
Abstract
Rising uncertainty in power systems due to ongoing system and operational changes has led to increasing risks in operating a system in a reliable and economic manner. There are growing reliability concerns with the widely used methods, such as the N-1 criterion, to [...] Read more.
Rising uncertainty in power systems due to ongoing system and operational changes has led to increasing risks in operating a system in a reliable and economic manner. There are growing reliability concerns with the widely used methods, such as the N-1 criterion, to determine operating reserve requirement during unit commitment, and the economic load dispatch method to allocate regulating margin to respond to disturbances. These deterministic methods do not consider the uncertainty or stochastic nature of power systems and are often inadequate to maintain the required operating reliability of modern power systems. This paper introduces a reliability index, designated as the committed generators’ response risk (CGRR) that can be used to maintain a specified level of operating reliability. A probabilistic method to evaluate the CGRR is presented and validated using a Monte Carlo simulation technique. An application of the new index and the methodology is illustrated using the IEEE Reliability Test System. The CGRR provides a comprehensive operating risk measurement of the committed generation until further assistance is available to support the system, and therefore helps operators in decision making for unit commitment and dispatch of the generating units to meet the projected load in the short future time. Full article
(This article belongs to the Special Issue Power System Reliability)
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14 pages, 2431 KiB  
Article
The Influence of Capacitance and Inductance Changes on Frequency Response of Transformer Windings
by Szymon Banaszak, Konstanty M. Gawrylczyk, Katarzyna Trela and Patryk Bohatyrewicz
Appl. Sci. 2019, 9(5), 1024; https://doi.org/10.3390/app9051024 - 12 Mar 2019
Cited by 8 | Viewed by 3296
Abstract
Frequency Response Analysis (FRA) is a test method used for assessment of mechanical condition of transformer active parts. Its biggest problem is the interpretation of test results, namely the relationship between scale of differences between compared curves and the decision for further operation [...] Read more.
Frequency Response Analysis (FRA) is a test method used for assessment of mechanical condition of transformer active parts. Its biggest problem is the interpretation of test results, namely the relationship between scale of differences between compared curves and the decision for further operation of the given transformer. Very often visible differences between two FRA curves do not mean that there is a deformation in the winding. The cause of the curve shift may come from other elements of the transformer that influence inductive or capacitive parameters. This paper takes under consideration the influence of both capacitance and inductance changes on transformer frequency response (FR). The analysis is performed with the computer model of a transformer and also some experimental results are presented, showing the influence of capacitance and inductance changes on the FR of real transformers. The results of research showed that this influence may lead to misleading effects on the shape of FR characteristics. The paper presents an analysis that can be used in the assessment of FRA measurement, especially in the case of uncertain data comparison results. Full article
(This article belongs to the Special Issue Power System Reliability)
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