scholarly journals A NEW APPROACH FOR DETERMINING THE SYSTEM TIME WITHOUT FAILURES USING PETRI NETS

2015 ◽  
Vol 5 (2) ◽  
Author(s):  
Bojana Zlatkovic ◽  
Biljana Samardzic
Keyword(s):  
Power System ◽  
Petri Nets ◽  
Key Words ◽  
Electric Power ◽  
Reliability Analysis ◽  
Fault Tree ◽  
Electric Power System ◽  
New Method ◽  
New Approach ◽  
System Time

A new method for determining the time without failures using Petri nets will be presented in this paper. Petri nets are very appropriate for modelling and analysis of different systems. Due to its simplicity, this method can be applicable in practice, for example, for reliability analysis and for the time without failures calculation. The results are illustrated using the example of electric power system. Key words: Petri nets,time without failures, fault tree

Research on Power Expert System Technology Integrated Fault Tree Theory and Fuzzy Algorithm

2013 ◽  
Vol 427-429 ◽  
pp. 1402-1406
Author(s):  
Shu Yang ◽  
Zhi Bin Zang ◽  
Hang Wu ◽  
Qing Su He ◽  
Jin Hong He
Keyword(s):  
Expert System ◽  
Power System ◽  
Electric Power ◽  
Fault Tree ◽  
Automatic Generation ◽  
Electric Power System ◽  
Logic Function ◽  
Fuzzy Algorithm ◽  
Exception Reporting ◽  
Theory Research

The electric power system is a complex distributed system of large dimension, nonlinear, time-varying and uncertain dynamic parameters, the control and decision need expert experience, so the experts in electric power system as the control mechanism is relatively reasonable has been increasingly recognized. Automatic generation of state warning, exception reporting, monitoring of the equipment maintenance scheme and application of expert system. In this paper, by using the fault tree logic function description and fuzzy algorithm theory research of expert system based on expert system, so that the power has more accurate knowledge base and higher correctness of reasoning, in order to needs of production and operation of the power system to meet the better.

scholarly journals Petri nets modelling of systems with redundancy

2021 ◽  
Vol 11 (2) ◽  
pp. 69-72
Author(s):  
Bojana Zlatković ◽  
Biljana Samardzić
Keyword(s):  
Power System ◽  
Petri Nets ◽  
Electric Power ◽  
Electric Power System

Petri nets are very appropriate for modelling and analysis of different systems. In this paper, examples of repairable and irreparable systems modelled using Petri nets have been given. Systems with cold and hot redundancy have been analyzed, also. The redundancy is illustrated using the example of the electric power system.

scholarly journals Reliability Evaluation for Aviation Electric Power System in Consideration of Uncertainty

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1175
Author(s):  
Yao Wang ◽  
Xinqin Gao ◽  
Yuanfeng Cai ◽  
Mingshun Yang ◽  
Shujuan Li ◽  
...  
Keyword(s):  
Power System ◽  
Electric Power ◽  
System Reliability ◽  
Probability Distributions ◽  
Rapid Development ◽  
Reliability Evaluation ◽  
Electric Power System ◽  
Traditional System ◽  
Electric Aircraft ◽  
System Time

With the rapid development of more electric aircraft (MEA) in recent years, the aviation electric power system (AEPS) has played an increasingly important role in safe flight. However, as a highly reliable system, because of its complicated flight conditions and architecture, it often proves significant uncertainty in its failure occurrence and consequence. Thus, more and more stakeholders, e.g., passengers, aviation administration departments, are dissatisfied with the traditional system reliability analysis, in which failure uncertainty is not considered and system reliability probability is a constant value at a given time. To overcome this disadvantage, we propose a new methodology in the AEPS reliability evaluation. First, we perform a random sampling from the probability distributions of components’ failure rates and compute the system reliability at each sample point; after that, we use variance, confidence interval, and probability density function to quantify the uncertainty of system reliability. Finally, we perform the new method on a series–parallel system and an AEPS. The results show that the power supply reliability of AEPS is uncertain and the uncertainty varies with system time even though the uncertainty of each component’s failure is quite small; therefore it is necessary to quantify system uncertainty for safer flight, and our proposed method could be an effective way to accomplish this quantization task.

scholarly journals Reliability of Latvian Power System’S 330 KV Substations

2014 ◽  
Vol 51 (3) ◽  
pp. 15-23 ◽  
Author(s):  
V. Nepomnyaschiy ◽  
J. Gerhards ◽  
A. Mahnitko ◽  
T. Lomane
Keyword(s):  
Power System ◽  
Electric Power ◽  
Reliability Analysis ◽  
Probabilistic Approach ◽  
Electric Power System ◽  
Topical Problem ◽  
Emergency Situations ◽  
Reliability Calculation ◽  
Substation Equipment ◽  
Electrical Substation

Abstract Substation reliability is always a topical problem. The authors consider the techniques for reliability calculation based on logical-probabilistic approach to the evaluation of electrical substation switchgear schemes and equipment at emergency situations with disconnections of individual elements of the substation equipment or false operation of relay protection and automation devices. Based on the reliability analysis made for the 330kV substations of Latvian Electric Power System, recommendations are given concerning the reconstruction of switchgear schemes for some substations

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