Modern power systems are becoming increasingly decentralized, with a greater degree of observability provided through a network of sensors and local controllers in addition to existing centralized SCADA platforms. However, the interconnectivity between sensors and controllers creates potential vulnerabilities which can be exploited by a cyberattack. The majority of components installed on the grid were designed with little or no consideration for aspects of cybersecurity and therefore leaving the network at risk of economic loss, asset damage or widespread blackouts. Present research in cyber-attack events and electrical grid resilience, often treats these in isolation. Furthermore, the ICT infrastructure in modern electrical networks is not tested as rigorously in terms of reliability and security as the physical assets. Therefore, an integrated approach is needed for the analysis of cyber-threats against power systems, linking the attack mechanisms in the ICT layer and the physical impacts at the electrical layer. This paper introduces a method of self-organizing communication architectures that for the first time has been applied to the problem of mitigating the negative impacts of Denial of Service cyber-attacks in the Smart Grid and demonstrates the benefits of this in a novel integrated environment connecting power system modeling and communication layer simulation. The paper demonstrates and quantifies the advantages of self-organization in terms of computational burden and voltage control in a distribution network experiencing multiple attack formats and increasing numbers of attackers.
The Smart Grid has three main characteristics, which are to some degree antagonistic. These characteristics are: provision of good power quality, energy cost reduction and improvement in the reliability of the grid. The need to ensure that they can be accomplished together demands a much richer ICT monitoring and control network than the current system. In this paper we particularly investigate the design and deployment of the ICT system in the urban environment, specifically in a university campus that is embedded in a city, thus it represents the Neighbourhood Area Network (NAN) level of the Smart Grid. In order to design an ICT infrastructure, we have introduced two related architectures: namely communications network architecture and a software architecture. Having access to the characteristics of a real NAN guides us to choose appropriate communication technologies and identify the actual requirements of the system. To implement these architectures at this level we need to gather and process information from environmental sensors (monitoring e.g. temperature, movement of people and vehicles) that can provide useful information about changes in the loading of the NAN, with information from instrumentation of the Power Grid itself. Energy constraints are one of the major limitations of the communication network in the Smart Grid, especially where wireless networking is proposed. Thus we analyse the most energy efficient method of collecting and sending data. The main contribution of this research is that we propose and implement an energy efficient ICT network and describe our software architecture at the NAN level, currently very underdeveloped. We also discuss our experimental results. To our knowledge, no such archi-tectures have yet been implemented for collecting data which can provide the basis of Decision Support Tools (DSTs).
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