Distribution System Reliability : An Overview (original) (raw)
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A Critical Review of Distribution Substation System Reliability Evaluations
2017
The significance of a reliable distribution system is hinged on the fact that even if the generation and transmission of a power system are highly reliable, an unreliable distribution system will mean that there will be poor supply of energy to the consumers. Therefore, there must be ways of measuring the reliability of power distribution systems according to given standards in order to help inform the system engineers on the causes of interruptions. This will in turn help in proffering methods of accomplishing a more reliable distribution system. There are established basic methods of assessing the reliability of this system and different researchers engage the one best suited for the analysis they intend to carry out. Moreover, going through previous published works on distribution system reliability evaluation, insight is given into why a distribution behaves below standard and how it could be possibly improved. This paper presents an overview of the basic methods used in reliabi...
Distribution Reliability Analysis Program
The objective of this paper is to present a computer program developed for Windows to compute reliability indices for different customers and set of customers served by the same distribution feeder. This program deals with information obtained directly from utility database to create an equivalent network modeling and run contingency analytical simulations. The system's average failure rates must be informed by the user, based on historical utility data, manufacturer test data or typical values. The program enables to compute penalties and annual costs of energy interruptions and compare the obtained indices with the reliability index targets set by the national regulatory agency (ANEEL) for the different sets of customen and distribution feeders under analysis The program allows to analyze changes in the system rates indicators and reliability index targets for each set of customers and expressions for the calculation of penalties in the event of violations of these targets. In order to meet the targets set by the regulatory agency, most distribution utilities began to register digitally their lines, equipment and history of interruptions, thus making it easier to develop computational programs and tools for analysis of power flow, short circuit and reliability of the distribution systems. Two different analyses are used to assess the reliability of the distribution systems: Historic and Predictive. Through the historic analysis, one can obtain the indices refemng to the interruptions occurred in the system for a given period of time, generating diagnoses of the system's past behavior. While the predictive analysis calculates the future expectation and in the topology of the electrical network and, thus, to carry of the system's behavior in the medium and long terms, out a sensitive study to verify the effect of some different justifying investments that can improve the reliability, the power quality, and reduce costs of energy interruption and other related costs. the components failure the repair juration, protection device schemas and distribution line sections. Considering that these factors are random, by nature, it is protection equipment and changes in the topology ofthe systems, switching duration, for restoring the reliability for different
RELIABILITY ANALYSIS OF POWER DISTRIBUTION NETWORK
Modern society is highly dependent on the efficient operation of electric power systems and has developed in such a way that even a small interruption in electric power supply has a significant effect. The knowledge of the reliability of distribution networks and systems is an important consideration in the system planning and operations for development and improvements of power distribution systems. To achieve the target of minimum interruptions as possible to customers, utilities must strive to improve the reliability but at the same time reduce cost. It is a known fact that most of customer interruptions are caused by the failure in distribution system. This paper presents the analysis of different case studies of distribution systems using Electrical Transient and Analysis Program (ETAP) software.
IMPROVEMENT IN RELIABILITY INDICES OF A POWER DISTRIBUTION SYSTEM: A CASE STUDY
Frequent occurrence of failures is common in Electrical Power Distribution Systems. The consequences of failure include high cost of maintenance, undesirable effects and risks which affect the power consumers. The important goals of reliability and maintainability of distribution systems are availability of continuous power and meeting the load requirements. The Power Distribution System at SIPRA Labs (BALANAGAR FACILITY) consists of three phase and single phase loads. In this work Reliability Analysis is conducted for each component like Miniature Circuit Breaker (MCB), Moulded Case Circuit Breaker (MCCB) and other different components by calculating failure rate and repair rate individually on yearly basis. Mean Time To Failure (MTTF), Mean Time To Repair (MTTR), Mean Time Between Failure (MTBF) of the overall system are calculated from failure rate and repair rate of each component. Customer-and Load-Oriented indices of overall Power Distribution System are predicted from load details, failure rate and Unavailability under each feeder line. MATLAB Programming is developed for overall system reliability analysis.
Reliability Analysis of Power Distribution System
Journal of Electrical Technology UMY
Electrical distribution system is a component of electrical power system that is very important because it is closest to the customer. In its operation, the distribution system often suffers that causes the flow of electricity to the customer is interrupted. This situation is not expected by customers or by electric power companies. The more frequent and longer the occurrence of electrical power flow interruption, the lower the system reliability, and vice versa. Reliability of a distribution system can be analyzed based on SAIDI and SAIFI parameters. In this research, reliability analysis of distribution system on Gejayan substation. The analysis result using SAIDI and SAIFI parameters shows that Gejayan substation is reliable enough to national standard, while based on international standard still not reliable.
International Journal of Smart Grid and Sustainable Energy Technologies
A primary requirement of a modern electric power system is reasonable ability to satisfy the customer load requirements. Electric utilities involve generation, transmission, and distribution facilities each one of which contributes its own inherent difficulties to the problem of satisfying customer requirement. A power system should be designed and expanded the facilities in order to perform its intended function with a reasonable risk. With increasing the electrical energy demand and the potential of disruption that may occur in the system, the distribution system must have high reliability and continues supply to customer. In this case, the reliability of the distribution system needs to be evaluated by monitoring and analyzing the level of distribution system failure in a certain period of time. A study on a practical distribution system with application of automatic circuit reclosers (ACRs) which plays an important role in enhancing the reliability index of system is presented....
International journal of engineering research and technology, 2020
In the presence time the electrical power demand growth is increasing rapidly with the development of the technology and also the electrical power system is set to meet the required demand of customers .However the reliability of the power system is the major challenge to meet the required demand of customers.in Ethiopia a numbers of customers rise complain to Ethiopia electric power utility because of the power interruption. Therefore reliability analysis of distribution powers system is important to determine how much the power interruption is affecting the customers. This is enabling to the Power Company and customers to seek better solution to improve the reliability of the power system typically the maychew distribution system. This paper analysis the reliability of maychew city distribution system using the analytical method based on the outage data gotten from the northern Region electric power utility office. The monthly reliability of 5 feeders was evaluated for 2011E/C. Fr...
RELSAD: A Python package for reliability assessment of modern distribution systems
Journal of open source software, 2022
The electrical power distribution system is under constant development and multiple changes will occur in the upcoming years. Through the integration of new technology such as Renewable Energy Resources (RES) and flexible resources such as microgrids, battery energy storage systems, and electrical vehicles, the distribution system becomes more active where bidirectional power flow is possible. In an active distribution system, utilization and control of the different sources are possible. Additionally, the system becomes smarter through the integration of Information and Communication Technology (ICT) where intelligent monitoring, automated control, and communication are possible. These changes increase the complexity of the distribution network and new dependencies and interdependencies in the system arise with the modernization of the system.
Composite automated distribution system reliability model considering various automated substations
International Journal of Electrical Power & Energy Systems, 2014
Due to the fact that automation can significantly improve reliability of substation as well as distribution system, this paper presents a composite reliability assessment model of distribution system which illustrates the impacts of substations automated by various automation configurations on the reliability of primary distribution systems equipped with a specific distribution automation (DA) scheme. First, three architectures of substation automation systems (SASs), known as ring, cascading, and star, are reviewed and their reliability block diagrams (RBDs) are developed. Reliability assessments for five types of automated substations are then done using the event tree and the concept of expectation methods. Afterwards, a particular automated distribution scheme designated as the low interruption system (LIS) is reviewed and the interaction between the SAS and the DA is then modeled using the event tree methodology. Finally, by presenting explicit formulas for reliability evaluations of the automated distribution system, the composite reliability assessment models are completed. The proposed approach is applied to the five distribution system configurations.
Reliability Assessment of Distribution System through Cost Analysis
Reliability of electric power is a major and a challenging concern. For any power company, with the advancement in technology, the distribution system is getting advanced, however supplying reliable electric power at a cheaper tariff is still the biggest challenge for any power company all around the world. One of the very popular ways that the power utility companies are trying to improve the reliability is by distribution automation. This paper is a systematic study of the 11kV Karberey-Ramety Feeder-II electricity power distribution network reliability evaluation and improvements to be applied. The main objective of the study is to compute reliability of the distribution system using Failure Mode and Effect Analysis method. Also, it presents step by step economic analysis to determine optimum number and location of automatic switch fulfilling reliability and economic constraints.