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Abstract
The cyber-physical nature of electric power systems has increased immensely over the past decades, with advanced communication infrastructure paving the way. It is now possible to design wide-area controllers, relying on remote monitor and control of devices that can tackle power system stability problems more effectively than local controllers. However, their performance and security relies extensively on the communication infrastructure and can make power systems vulnerable to disturbances emerging on the cyber side of the system. In this study, the authors investigate the effect of communication delays on the performance of wide-area damping controllers designed to stabilise oscillatory modes in a cyber-physical power system (CPPS). They propose a rule-based control strategy that combines wide-area and traditional local stabilising controllers to increase the performance and maintain the stable operation of CPPS. The proposed strategy is validated on a reduced CPPS equivalent model of Great Britain.
Highlights
As electric power systems move toward a low-carbon energy future, the demand for higher sustainability leads to the decommissioning of conventional fossil-fuel generators and their replacement with intermittent and predominantly power-electronicinterfaced renewable energy sources
6 Conclusions Electric power systems are quickly being transformed into cyber-physical power system (CPPS), with the improved communication capabilities paving the way for enhanced functionalities being deployed over the cyber layer
Using public communication networks to implement the new CPPS services can significantly reduce the installation and operation cost but at the same time expose CPPS to stability problems arising from decreased performance or disturbances in the communication network
Summary
As electric power systems move toward a low-carbon energy future, the demand for higher sustainability leads to the decommissioning of conventional fossil-fuel generators and their replacement with intermittent and predominantly power-electronicinterfaced renewable energy sources. Advances in remote communication and sensing with the use of global positioning system (GPS) synchronised phasor measurement units have allowed for the development of new wide-area monitoring systems able to receive, process, and visualise information from large-scale power systems [4] Owing to this improved situational awareness, real-time monitoring of the CPPS dynamic health is a possibility, reducing the likelihood of outages and catastrophic blackouts [5, 6]. This advanced communication infrastructure can provide improved remote control capabilities, providing an ideal platform for wide-area damping controllers (WADCs) designed to tackle oscillatory problems in the system and enhance its stability [6,7,8,9]. By providing robustness to the parametric uncertainty coming from communication time delays, the security of the CPPS can be significantly improved
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