Assessing the contribution of automation to the electric distribution network reliability (original) (raw)

Reliability Indices Evaluation of Distribution Networks for Automation

2019

The world electric power systems are fast becoming smart, with the grid possessing capabilities that enable it self-heal in the case of device failures. If the Nigerian distribution networks are automated, it would go a long way in sustaining the ailing power grid. For automation to be carried out in the network, certain features would be enhanced through integration of high-speed, reliable and secure data communication networks to manage the complex power systems effectively and intelligently. This work presents the reliability evaluation of power distribution networks in Rivers State, Nigeria. Certain reliability indices were calculated using data obtained from Port Harcourt Electricity Distribution Company (PHEDC), Ahoada Business unit and Agogo Services, Egi Power Distribution network. The Performance, reliability and quality of service of the networks were investigated. The investigation revealed the system had an average availability of 64.44% for Ahoada and 74.10% for Egi as ...

Reliability Analysis of Distribution Automation on Different Feeders

2011

Automating a distribution system is an effective means to provide a more reliable and economical system in the fast growing technological world. This paper delivers into automating a system using two- stage restoration (partial automation) and put forward a feeder automation system based on substation automation platform that can be applied to electrical distribution systems for high economic-technical efficiency. Improved reliability is evaluated when feeder automation is applied to distribution. This paper studies three different feeders and decides on the most probable reliable feeder among them. Power system has a number of generating stations of different types interconnected by a system of transmission lines, sub transmission lines and distribution networks to supply different types of loads to various consumers. Distribution system is that part of an electrical power system which is dedicated to delivering electric energy to the consumer. The distribution system makes use of ...

RELIABILITY WORTH ASSESSMENT FOR DISTRIBUTION SYSTEMS: AUTOMATED VS. TRADITIONAL CONFIGURATIONS

International Journal of Power and Energy Systems, 2006

The influence of the electricity market on electrical distribution development determines new technical and legislative factors that limit the profitability of distribution companies. One of the main concerns for distribution companies, from both a technical and an economic viewpoint, is the regulations governing the quality of supply and, in particular, service continuity. In general, to cope with reliability requirements, it is necessary to invest in distribution restructuring, aiming at an optimal choice of operating schemes and management strategies, which often include telecontrol and automation in order to obtain improved continuity levels. In this context, distribution system reliability calculation is a crucial task: it enables utilities, on the one hand, to select the most appropriate configuration and operational procedure from various available options and, on the other, to predict the increased reliability obtainable by restructuring existing systems. To provide a wide basis for comparison between different network configurations and operational strategies, this article presents a study that highlights how telecontrol and automation affect the performance, in terms of various system reliability indices, of radial, open-loop, ring, and flower configurations. The information provided by evaluation of the reliability level at which different configurations can serve customers can be used in reliability worth assessments. Finally, the article briefly discusses how to use this information from the distributor's and the customers' point of view. In this latter perspective, an economic evaluation in terms of customer outage cost (COC) is considered.

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 Improvement of Power Distribution Systems using Advanced Distribution Automation

Renewable Energy and Sustainable Development, 2017

Towards the complete vision of smarter distribution grid, advanced distribution automation system (ADAS) is one of the major players in this area. In this scope, this paper introduces a generic strategy for cost-effective implementation and evaluation of ADAS. Along with the same line, fault location, isolation and service restoration (FLISR) is one of the most beneficial and desirable applications of ADAS for selfhealing and reliability improvement. Therefore, a localcentralized-based FLISR (LC-FLISR) architecture is implemented on a real, urban, underground medium voltage distribution network. For the investigated network, the complete procedure and structure of the LC-FLISR are presented. Finally, the level of reliability improvement and customers' satisfaction enhancement are evaluated. The results are presented in the form of a comparative study between the proposed automated and non-automated distribution networks. The results show that the automated network with proposed ADAS has a considerable benefit through a significant reduction in reliability indices. In addition, it has remarkable benefits observed from increasing customers' satisfaction and reducing penalties from industry regulators.

Reliability of Aged Distribution Networks: Can the Automation Be the Solution in the Long Term?

2008

This paper analyzes long term potential strategies against the increasing of sustained interruptions due to ageing in distribution networks. A methodology based on a sequential Monte Carlo (SMC) algorithm, which permits simulating the reliability of distribution networks by considering the sequence of events caused by a network fault, is used. The technique may be used to compare different strategies for enhancing network reliability; in particular, the deployment of distribution automation and the adoption of intentional islanding with distributed generation are investigated. The studies performed shown that a wider use of network automation cannot be sufficient to face the effects of ageing, and that in few years, despite the investments sustained, the performances of distribution networks will be close to those that they have already reached. The presented analysis is of interest to distribution companies which have to understand the long term benefits of their investments.

METROPOLITAN AREA DISTRIBUTION FEEDER NETWORK ANALYSIS FOR RELIABILITY INDICE'S

The parameters of reliability of power distribution are the major goal lines to define the health status of any utility and its customer satisfaction. The reliability parameters of power distribution engineering are SAIDI, SAIFI, CAIDI and CAIFI, which are the primary contributors, which access the Utility-Customer dynamics in terms of credibility, accountability and satisfaction. In this paper, the reliability parameters for local Metropolitan Area Electricity Supply Company has been analyzed for the year 2014 starting from 1 st January 2014 to 31 st December 2014. These reliability parameters would be beneficial for the Utility to make major overhauling decision or adaptation of any latest technologies to enable a good customer relation as well as utility status. This parameter can also become the path way for implementing technology at the substation level, feeder level or at the customer end or in other words adoption of distribution system automation at the fundamental levels, basically in the form of substation automation, feeder automation and customer automation. This research activity demonstrates need for greater fault management system for improvement of distribution network reliability as well as customer satisfaction by the utility.

Distribution System Reliability : An Overview

2015

From the survey of previously published papers, it is found that most of work is done on the generation and transmission side reliability, whereas little work is done on distribution system reliability and Indices under deregulated environment. In reliability study of distribution system development of accurate and consistent models to represent system behavior is always a main concern to researchers. A computer program which provides system representation for the evaluation of substation and switching station reliability performance in terms of outage frequencies and duration is needed. It performs failure modes and effects analysis and provides a concise and orderly description of various combinations of occurrences within the system that could result in an interruption and is applied to practical systems. The effects of different component failure modes, normally open breakers or switches, unrealistic protective system etc. must include in reliability predictions. In this paper a...

Assessment of Reliability for Distribution Feeders on the Basis of Cost Analysis

2014

Abstract--- In this fast growing world, automating a distributing system is an effective means of providing a reliable system. There is an increasing interest in the quantitative assessment of power system reliability worth and its application to cost-benefit evaluation in power system planning. Hence this paper deals with automating a system using two stage restorations (partial automation). It introduces a feeder automation system using the concept of optimal placement of switches that can be applied to electrical distribution systems for high economic-technical efficiency. Reliability is analyzed and evaluated when feeder automation is applied to distribution and its worth is assessed. This paper, further, looks into a case study involving reliability and economic evaluation of Urban, Rural and Industrial Feeders and draws a most probable conclusion.

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...