scholarly journals Analysis of additional factors for determining heat network pipelines failure rates

2018 ◽  
Vol 58 ◽  
pp. 01011 ◽  
Author(s):  
Irina Akhmetova ◽  
Timur Akhmetov
Keyword(s):  
Experimental Data ◽  
Heat Supply ◽  
Input Data ◽  
Network Reliability ◽  
Failure Rates ◽  
Heat Network ◽  
Heat Networks ◽  
Reliability Indices ◽  
The Impact ◽  
Supply Reliability

The paper suggests the methodology to assess the reliability of both the heat network schemes under design and the existing heat network schemes, that allows to determine availability factor and failure-free operation probability on the basis of the input data including the length, diameter and exploitation time of pipeline segments of the heat networks. As a result of the research, the additional factors that have a significant impact on the reliability of heat supply to consumers have been determined. The impact of these factors on the heat network reliability relying on the experimental data provided by regional heat supply organizations has been assessed. Additional factors were taken into account when developing a new methodology and algorithm for calculating heat supply reliability indices. The program for calculating the consumer heat supply reliability is worked out.

Improvement of the methodology assessment of reliability heat supply systems at the facilities of main pipelines

2021 ◽  
pp. 198-202
Author(s):  
Марина Николаевна Ильина ◽  
Дмитрий Васильевич Ларюшкин
Keyword(s):  
Cluster Analysis ◽  
Heat Supply ◽  
Network Reliability ◽  
Reliability Assessment ◽  
Heat Supply System ◽  
Operating Conditions ◽  
Heat Network ◽  
Heat Networks ◽  
Heat Supply Systems ◽  
Supply Systems

Источником информации о техническом состоянии трубопроводов тепловых сетей объектов магистральных нефтепроводов ПАО «Транснефть» являются результаты их обслуживания и ремонта, технического освидетельствования, гидравлических испытаний и т. д. На основании этих данных проводятся расчеты показателей надежности, по итогам анализа которых осуществляется планирование дальнейшего технического обслуживания и ремонта. Однако при оценке надежности систем теплоснабжения необходимо учитывать не только срок эксплуатации и величину амортизационного износа, но и реальное состояние в конкретных условиях функционирования. Учесть многообразие факторов, которые влияют на работоспособность трубопроводов системы теплоснабжения, и тем самым повысить точность расчетов при оценке их остаточного ресурса позволяет применение кластерного анализа в дополнение к используемой методике оценки надежности тепловых сетей. В рамках настоящей работы оценка надежности объектов АО «Связьтранснефть» с применением кластерного анализа проведена на примере равнозначных участков тепловых сетей двух узлов связи, расположенных в Краснодарском крае и Республике Саха (Якутия). Currently, information about technical condition of pipelines of heat supply systems at the facilities of the main oil pipelines of PJSC Transneft is formed based on the results of maintenance and repair, technical inspection, hydraulic tests, etc. Upon these data, calculations of reliability indicators of heat networks are carried out, based on the analysis of calculations further maintenance and repairs are planned. However, when assessing the reliability of heat supply systems, it is necessary to take into account not only the service life and the amount of depreciation wear of heat network elements, but also their real state in specific operating conditions. The use of cluster analysis in addition to the currently used method of heat network reliability assessment allows us to take into account the variety of factors that affect the operability of pipelines of the heat supply system, and thereby increase the accuracy of calculations when assessing their residual resource. Within the framework of this work, the reliability assessment of Svyaztransneft JSC facilities using cluster analysis was carried out on the example of equivalent sections of heat networks of two communication nodes located in the Krasnodar Territory and the Republic of Sakha (Yakutia).

Methods for Comprehensive Analysis of Heat Supply Reliability

2013 ◽  
Vol 2 (4) ◽  
pp. 120-142
Author(s):  
V. A. Stennikov ◽  
I. V. Postnikov
Keyword(s):  
Heat Supply ◽  
Methodological Approach ◽  
Flow Distribution ◽  
Heat Supply System ◽  
Short Review ◽  
Comprehensive Analysis ◽  
Heat Energy ◽  
Production And Distribution ◽  
The Impact ◽  
Supply Reliability

The paper deals with the problem of comprehensive analysis of heat supply reliability for consumers. It implies a quantitative assessment of the impact of all stages of heat energy production and distribution on heat supply reliability for each consumer of the heat supply system. A short review of existing methods for the analysis of fuel and heat supply reliability is presented that substantiates the key approaches to solving the problem of comprehensive analysis of heat supply reliability. A methodological approach is suggested, in which mathematical models and methods for nodal evaluation of heat supply reliability for consumers are developed and the studies on the impact of different elements of fuel and heat supply systems on its level are described. Mathematical modeling is based on the Markov random processes, models of flow distribution in a heat network, deterministic dependences of thermal processes of heat energy consumption and some other models.

scholarly journals Reliability Assessment of Distribution Networks with Optimal Coordination of Distributed Generation, Energy Storage and Demand Management

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3202
Author(s):  
Alberto Escalera ◽  
Edgardo D. Castronuovo ◽  
Milan Prodanović ◽  
Javier Roldán-Pérez
Keyword(s):  
Energy Storage ◽  
Distribution Systems ◽  
Network Reliability ◽  
Demand Management ◽  
Reliability Assessment ◽  
Distribution Networks ◽  
Reliability Indices ◽  
Optimal Coordination ◽  
Management Techniques ◽  
The Impact

Modern power distribution networks assume the connection of Distributed Generators (DGs) and energy storage systems as well as the application of advanced demand management techniques. After a network fault these technologies and techniques can contribute individually to the supply restoration of the interrupted areas and help improve the network reliability. However, the optimal coordination of control actions between these resources will lead to their most efficient use, maximizing the network reliability improvement. Until now, the effect of such networks with optimal coordination has not been considered in reliability studies. In this paper, DGs, energy storage and demand management techniques are jointly modelled and evaluated for reliability assessment. A novel methodology is proposed for the calculation of the reliability indices. It evaluates the optimal coordination of energy storage and demand management in order to reduce the energy-not-supplied during outages. The formulation proposed for the calculation of the reliability indices (including the modelling of optimal coordination) is described in detail. The methodology is applied to two distribution systems combining DGs, energy storage and demand management. Results demonstrate the capability of the proposed method to assess the reliability of such type of networks and emphasise the impact of the optimal coordination on reliability.

scholarly journals Stochastic Planning and Operational Constraint Assessment of System-Customer Power Supply Risks in Electricity Distribution Networks

2021 ◽  
Vol 13 (17) ◽  
pp. 9579
Author(s):  
Mikka Kisuule ◽  
Ignacio Hernando-Gil ◽  
Jonathan Serugunda ◽  
Jane Namaganda-Kiyimba ◽  
Mike Brian Ndawula
Keyword(s):  
Sequential Monte Carlo ◽  
Network Reliability ◽  
Distribution Network ◽  
Integrated Approach ◽  
Distribution Networks ◽  
Test System ◽  
Electricity Distribution ◽  
Reliability Indices ◽  
Operational Constraints ◽  
The Impact

Electricity-distribution network operators face several operational constraints in the provision of safe and reliable power given that investments for network area reinforcement must be commensurate with improvements in network reliability. This paper provides an integrated approach for assessing the impact of different operational constraints on distribution-network reliability by incorporating component lifetime models, time-varying component failure rates, as well as the monetary cost of customer interruptions in an all-inclusive probabilistic methodology that applies a time-sequential Monte Carlo simulation. A test distribution network based on the Roy Billinton test system was modelled to investigate the system performance when overloading limits are exceeded as well as when preventive maintenance is performed. Standard reliability indices measuring the frequency and duration of interruptions and the energy not supplied were complemented with a novel monetary reliability index. The comprehensive assessment includes not only average indices but also their probability distributions to adequately describe the risk of customer interruptions. Results demonstrate the effectiveness of this holistic approach, as the impacts of operational decisions are assessed from both reliability and monetary perspectives. This informs network planning decisions through optimum investments and consideration of customer outage costs.

scholarly journals Analysis of Network Reliability Characteristics and Importance of Components in a Communication Network

Mathematics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1347
Author(s):  
Soni Bisht ◽  
Akshay Kumar ◽  
Nupur Goyal ◽  
Mangey Ram ◽  
Yury Klochkov
Keyword(s):  
Communication Network ◽  
Growth Factor ◽  
Network Reliability ◽  
Importance Measure ◽  
Average Risk ◽  
Reliability Indices ◽  
Reliability Characteristics ◽  
Critical Components ◽  
Component Failures ◽  
The Impact

Network reliability is one of the most important concepts in this modern era. Reliability characteristics, component significance measures, such as the Birnbaum importance measure, critical importance measure, the risk growth factor and average risk growth factor, and network reliability stability of the communication network system have been discussed in this paper to identify the critical components in the network, and also to quantify the impact of component failures. The study also proposes an efficient algorithm to compute the reliability indices of the network. The authors explore how the universal generating function can work to solve the problems related to the network using the exponentially distributed failure rate. To illustrate the proposed algorithm, a numerical example has been taken.

scholarly journals Impact of deicing agents on heat network corrosion

2018 ◽  
Vol 58 ◽  
pp. 02005
Author(s):  
Ivan Postnikov ◽  
Valery Stennikov ◽  
Vitaly Shamansky ◽  
Alexander Kozlov ◽  
Pavel Sokolov
Keyword(s):  
Service Life ◽  
Heat Supply ◽  
Detrimental Effect ◽  
Economic Damage ◽  
Heat Network ◽  
Network Infrastructure ◽  
Sliding Bearings ◽  
Network Equipment ◽  
The Impact ◽  
Deicing Agents

This research is caused by the need to make a scientific and technical analysis and obtain informed assessments of the consequences of deicing agents application to urban roads for the heat network infrastructure. The main objectives of this research were to assess the impact of the deicing agent on initiation and acceleration of corrosion of the heat network equipment (pipelines, nonmobile and sliding bearings), the effect of this corrosion on reliability of heat supply to consumers, and to determine the economic damage caused by the decline in service life of pipelines. In addition, the study identified additional circumstances of the detrimental effect of deicing agents on the heat network infrastructure associated with destructive changes in the concrete structures of the heat network thermal chambers.

Reliability Evaluation of Distribution Networks Including Micro-Grid Considering Time-Varying Failure Rate

2014 ◽  
Vol 536-537 ◽  
pp. 1570-1577
Author(s):  
Jiang Ping Zou ◽  
Bi De Zhang ◽  
Xiao Zhou Ling ◽  
Jun Deng ◽  
Di He ◽  
...  
Keyword(s):  
Failure Rate ◽  
Sequential Monte Carlo ◽  
Network Reliability ◽  
Distribution Networks ◽  
Reliability Evaluation ◽  
Time Varying ◽  
Operation Condition ◽  
Reliability Indices ◽  
Micro Grid ◽  
The Impact

To analyze the impact of components operating environment and micro-grid on the distribution network reliability evaluation, the characteristics of components failure rate changes with operation condition are researched, and the full life cycle of the time-varying failure rate model of non-power components is built; reliability model for co-generation of hybrid, photovoltaic and energy storage system is introduced, as the power output of photovoltaic and hybrid generation is stochastic; the reliability of modified IEEE RBTS is evaluated by the built model and sequential Monte Carlo simulation method after load failure effect table is established by the reachability analysis method, the application of the proposed method to calculation example verifies its effectiveness by comparing and analyzing the reliability indices in different situations.

scholarly journals Stochastic Planning and Operational Constraint Assessment of System-Customer Power Supply Risks in Electricity Distribution Networks

2021 ◽  
Author(s):  
Mikka Kisuule ◽  
Ignacio Hernando-Gil ◽  
Jonathan Serugunda ◽  
Jane Namaganda-Kiyimba ◽  
Mike Brian Ndawula
Keyword(s):  
Sequential Monte Carlo ◽  
Network Reliability ◽  
Distribution Network ◽  
Integrated Approach ◽  
Distribution Networks ◽  
Test System ◽  
Electricity Distribution ◽  
Reliability Indices ◽  
Operational Constraints ◽  
The Impact

Electricity distribution network operators face several operational constraints in the provision of safe and reliable power given that investments for network area reinforcement must be commensurate with improvements in network reliability. This paper provides an integrated approach for assessing the impact of different operational constraints on distribution network reliability by incorporating component lifetime models, time-varying component failure rates as well as the monetary cost of customer interruptions in an all-inclusive probabilistic methodology that applies a time-sequential Monte Carlo simulation. A test distribution network based on the Roy Billinton test system is modelled to investigate the system performance when overloading limits are exceeded as well as when preventive maintenance is performed. Standard reliability indices measuring the frequency and duration of interruptions, and the energy not supplied are complemented with a novel monetary reliability index. The comprehensive assessment includes not only average indices but also their probability distributions to adequately describe the risk of customer interruptions. Results demonstrate the effectiveness of this holistic approach as the impacts of operational decisions are assessed from both reliability and monetary perspectives. This informs network planning decisions through optimum investments and consideration of customer outage costs.

Problems of Modeling and Optimization of Heat Supply Systems

2016 ◽  
pp. 102-126 ◽  
Author(s):  
Valery A. Stennikov ◽  
Ivan V. Postnikov
Keyword(s):  
Heat Supply ◽  
Methodological Approach ◽  
Comprehensive Analysis ◽  
Heat Energy ◽  
Production And Distribution ◽  
Optimization Of Heat Supply ◽  
Heat Supply Systems ◽  
The Impact ◽  
Supply Systems ◽  
Supply Reliability

This chapter deals with the problem of comprehensive analysis of heat supply reliability for consumers. It implies a quantitative assessment of the impact of all stages of heat energy production and distribution on heat supply reliability for each consumer of the heat supply system. A short review of existing methods for the analysis of fuel and heat supply reliability is presented that substantiates the key approaches to solving the problem of comprehensive analysis of heat supply reliability. A methodological approach is suggested, in which mathematical models and methods for nodal evaluation of heat supply reliability for consumers are developed and the studies on the impact of different elements of fuel and heat supply systems on its level are described. Mathematical modeling is based on the Markov random processes, models of flow distribution in a heat network, deterministic dependences of thermal processes of heat energy consumption and some other models.

scholarly journals Methods for the determination of the effective heating radius in district heating systems taking into account reliability

2020 ◽  
Vol 216 ◽  
pp. 01058
Author(s):  
Ekaterina Mednikova ◽  
Ivan Postnikov
Keyword(s):  
Heat Supply ◽  
District Heating ◽  
Eastern Siberia ◽  
Heat Network ◽  
Heating Systems ◽  
Reliability Indices ◽  
District Heating Systems ◽  
The City

Methods for determining the effective heating radius (EHR) in district heating systems (DHS) are developed, taking into account ensuring of reliable heat supply to consumers. EHR is such a length (distance) of a heat network (HN) from a district heat source (HS) to a consumer, within which the district heat supply of a given consumer is economically more profitable than a distributed (autonomic) one. Thus, the search for EHR for different transmission heat pipelines (TP) connected to the considered HS determines of its operation zones in different districts of the city. In addition, to the main problem of the EHR search, the assessment of nodal reliability indices (RI) for each consumer is carried out, on the basis of which the obtained EHR solutions are corrected (if necessary). As a result, we can determine the zones of district heating in DHS, within the framework of which not only energy and economically effective, but also reliable heat supply to consumers is provided. The developed methodical ensuring was used in the development of an optimal heat supply scheme for the Irkutsk city (Eastern Siberia, Russia). The brief review on the results of the conducted practical researches case study is presented.

Sign in / Sign up

Export Citation Format

Share Document