M. H. Ali
University of Memphis, United States
Keywords: Cyber security, Photovoltaic system, battery energy storage, smart inverter, critical infrastructureGrid interconnection of photovoltaic (PV) system is accomplished through the smart inverter, which converts DC power generated from PV modules to AC power. However, through the Passport Advantage (PPA) cloud environment [in case of an independent PV system] or through the supervisory control and data acquisition (SCADA) system [in case of a PV farm owned and operated by utility], an intruder can enter and disconnect controllers and components of the PV system. For example, the intruders may disable the smart inverter by changing any reference values of the voltage source inverter (VSI). Consequently, the terminal voltage of the PV, power, frequency, DC link voltage, etc., will be affected. Also, the adverse impact will go to the distribution grid. If the controllers and components do not function properly, the performance of the PV system and overall power grid will deteriorate. The goal of this research is to investigate and test cyber security vulnerabilities and develop novel mitigation solutions based on nonlinear controllers for various components of the PV system, such as smart inverter, DC-DC converter, battery energy storage, etc., with a view to building a resilient and reliable power grid and assuring efficient and uninterrupted energy service to critical infrastructure.