Critical infrastructure Maintenance of power systems considering time-dependent uncertainty

2014 ◽  
pp. 1163-1168 ◽  
Keyword(s):  
Power Systems ◽  
Critical Infrastructure ◽  
Time Dependent ◽  
Infrastructure Maintenance

CRITICAL INFRASTRUCTURES AND THEIR IMPORTANCE IN MODERN SOCIETIES – PROTECTION, SAFETY, SECURITY

2021 ◽  
Vol 17 (1) ◽  
pp. 389-398
Author(s):  
Georgiana-Cătălina CHIȚAC
Keyword(s):  
Power Systems ◽  
National Security ◽  
Emergency Services ◽  
Critical Infrastructure ◽  
Modern Society ◽  
Armed Forces ◽  
Point Of View ◽  
Critical Infrastructures ◽  
Human Society ◽  
New Perspective

Abstract: Nowadays, the modern security environment has it foundation based on some vital pilons, that are also important for the normal functionality of the modern society. This paper will offer a new perspective on critical infrastructure protection, defining the relationships that take place freely in a modern society. The international security could be analyzed from functional (systemic) and structural points of view. From the systemic point of view, the global security is characterized by five major systems: political, economic, social (socio-demographic), cultural and ecological. From the structural point of view, besides the above systems there are other ones: military, intelligence, communications and infrastructure (the critical infrastructure, health, financial, culture, education and research). There are certain infrastructures such as: telecommunications, transports, systems of power or water supply, IT systems, diverse systems and emergency services, that are actually fundamental to a prosperous economy and therefore critical to the development of human society. Telecommunications, power systems and transport infrastructures are essential infrastructures that ensure not only the mobility, but also the adequate performance of the armed forces, which is one more reason for which these infrastructures are critical. The degree of development and resilience of national and European critical infrastructures is essential for the economic growth and for ensuring the security and welfare of society on the whole. Therefore, the modern national security, seen as a system or a structure, has been passing through a reform and modernization process in order to adapt to the challenges of the 21st Century and the requirements triggered by North Atlantic Treaty Organization and European Union memberships, and not only. In this context there is a need for some security politics and strategy which could increase the national security condition.

scholarly journals Relations of Imperfect Repairs to Critical Infrastructure Maintenance Costs

2021 ◽  
Vol 13 (9) ◽  
pp. 4917
Author(s):  
Agnieszka Blokus ◽  
Przemysław Dziula
Keyword(s):  
Critical Infrastructure ◽  
Renewal Theory ◽  
Maintenance Policy ◽  
Maintenance Costs ◽  
Infrastructure Systems ◽  
Availability Analysis ◽  
Short Period ◽  
Infrastructure Maintenance ◽  
Imperfect Repairs ◽  
Critical Infrastructure Systems

This article presents an analysis of maintenance costs and maintenance policy of critical infrastructure systems, considering the case of imperfect repair. The maintenance costs of the systems, considering a multistate approach and imperfect repairs, are analyzed with reference to the renewal stream and renewal process theory. Availability characteristics of repairable critical infrastructure systems with non-negligible renovation time, necessary for the cost analysis, are determined based on classical renewal theory. We assume that the system is renewed after exceeding its critical reliability state. The multistate approach proposed to availability analysis, including imperfect repairs, allows considering various configurations of the system’s renewals. The procedure for determining the total cost of maintenance up to certain point in time is proposed. Furthermore, the procedure comparing the costs of repair and operation of the system until a certain moment for different configurations of the number of repairs to various reliability states is put forward and its exemplary application is presented. Conducting perfect renewals of infrastructure to the state of entire availability seems to be the most profitable in the case study analyzed in the article. The exception is when imperfect repairs are much cheaper than perfect repairs (they are up to half of the perfect repair cost), or when costs of an infrastructure’s renewals are considered in the short period of its exploitation (up to one year). The summary provides a conclusion on maintenance policy based on the proposed procedure analysis and a comparison of maintenance costs for various configurations of perfect and imperfect repairs.

scholarly journals Examples of implementation of a multi-model qualimetric method for system optimization of marine engineering and marine infrastructure facilities

2021 ◽  
pp. 69-81
Author(s):  
А.В. Алексеев
Keyword(s):  
Power Systems ◽  
Control Systems ◽  
Research Design ◽  
Critical Infrastructure ◽  
Technological Development ◽  
System Optimization ◽  
Operating Conditions ◽  
Technical Equipment ◽  
Design Objects ◽  
Marine Engineering

Стремительный рост сложности современных объектов морской техники и морской инфраструктуры, ужесточение требований к качеству процессов их создания и эксплуатации на всех этапах жизненного цикла обуславливают особую необходимость поиска инвариантных к специфике условий эксплуатации технических и технологических решений. Соответственно, моделей их оценки, анализа, синтеза, оптимизации, исследовательского проектирования и обоснования их свойств и характеристик, включая количественный анализ конкурентной способности, перспективности и путей их технологического развития. В развитие ранее представленных модели и методики инвариантной оценки качества и эффективности объектов морской техники и морской инфраструктуры рассмотрены конкретные примеры реализации разработанного Полимодельного квалиметрического метода системной оптимизации объектов исследовательского проектирования. Включая оценку и мониторинг технической готовности объектов критической инфраструктуры, отдельных кораблей и их соединений, систем управления оружием и техническими средствами, электроэнергетических систем, автоматизированных систем управления в защищенном исполнении, автоматизированных интеллектуальных систем поддержки принятия решений. The rapid increase in the complexity of modern marine equipment and marine infrastructure, the tightening of requirements for the quality of the processes of their creation and operation at all stages of the life cycle make it particularly necessary to find technical and technological solutions that are invariant to the specifics of the operating conditions. Accordingly, models of their evaluation, analysis, synthesis, optimization, research design and justification of their properties and characteristics, including a quantitative analysis of their competitive ability, prospects and ways of their technological development. In the development of the previously presented model and methodology for invariant assessment of the quality and efficiency of marine engineering and marine infrastructure objects, specific examples of the implementation of the developed Polymodel qualimetric method for system optimization of research design objects are considered. Including assessment and monitoring of the technical readiness of critical infrastructure facilities, individual ships and their connections, weapons and technical equipment control systems, electric power systems, automated control systems in a secure design, automated intelligent decision support systems.

Measuring Cascading Failures in Smart Grid Networks

2016 ◽  
pp. 208-225
Author(s):  
Sotharith Tauch ◽  
William Liu ◽  
Russel Pears
Keyword(s):  
Smart Grid ◽  
Power Systems ◽  
Critical Infrastructure ◽  
Average Distance ◽  
Electrical Power ◽  
Cascading Failures ◽  
Electrical Power Systems ◽  
Interdependent Networks ◽  
Grid Networks ◽  
Degree Correlation

Smart Grid is the next generation of the electrical power systems that form from interdependent networks. Cascading failures in such interdependent critical infrastructure is very crucial which can cause wide spread disruption. This chapter is intended to evaluate four different topological metrics in which can be best described and approximated the behavior of cascading failures in interdependent networks by employing two interlinks strategies such as random interlinks addition and degree-degree correlation interlinks. The four chosen topological metrics are algebraic connectivity, effective graph resistance, average betweenness centrality, and average distance. Throughout the chapter, analytical study of each metric are discussed and also compared with numerical simulation based on sandpile dynamics load distribution.

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