| This thesis is aimed at enhancing the security and resilience of power supplies for facilitating the development of a Smart Grid, when power systems in various parts of the world have been undergoing transitions toward cyber-physical systems.;First, this thesis discusses common cybersecurity vulnerabilities in modern power systems and presents physical implications of cyberattacks on power system operations. In particular, this thesis analyzes a specific type of coordinated cyber-physical attacks that could lead to undetectable line outages.;Second, this thesis offers the pertinent studies on quantifying the risk of cybersecurity vulnerabilities in power system operations. A type of locally coordinated cyber-physical attacks is analyzed in detail, which would cause undetectable line outages in local areas without the need for complete network information.;Third, this thesis studies security measures for mitigating the cybersecurity risk in power system operations. A game-theoretic framework is built for determining the optimal combination of security measures based on the minimax-regret decision rule. Acceleration techniques are also provided to improve the computation efficiency for large-scale power system applications.;Fourth, this thesis extends the discussion of cybersecurity vulnerabilities to the operation of distributed power systems like microgrids. The assessment and mitigation of the cybersecurity risk in microgrid operations is presented in depth. Additional opportunities provided by software-defined networking technologies to enhance the microgrid cybersecurity are realized by the proposed defense-in-depth framework that comprises three lines of defense against cyberattacks.;Last, this thesis investigates the role of networked microgrids in enhancing the power system resilience against extreme events. The notion that the deployment of networked microgrids catalyzes the resilience enhancement in a Smart Grid is discussed in detail. The management of networked microgrids for achieving a higher degree of resilience, reliability, and efficiency of power supplies is also discussed based on the proposed hierarchical control framework. |
