Ahmad Khan successfully passed his Ph.D. dissertation preliminary examination!
Ahmad Khan, Ph.D. candidate of the IPEG lab successfully passed his Ph.D. dissertation preliminary examination on 04.05.2022.
The title of his presentation was, "Intrusion Detection System and Corrective Actions for Modern Power System".
The abstract of his presentation is as follows:
Abstract: The futuristic energy paradigm implicates high penetration of renewable based generation through embracing distributed energy generators (DEGs). At the grid edge, grid-feeding inverters are the prevailing type of DEGs. In this mode of operation, the DEGs are following the inertial response of the network and their capabilities are confined in injecting/absorbing current into/from their local point of common coupling bus. Henceforth, real-time system level coordination is crucial to assure the optimal utilization of DEGs that are potentially installed behind the meters. Thereby, concepts such as the power electronics-dominated grid (PEDG) with multi-layer control layout are used as an effective solution enabling DEGs efficient utilization. However, this futuristic power grid is anticipated to be vulnerable to malicious cyber-attacks due to the dispersed generation nature. In this dissertation, an intrusion detection system (IDS) is developed to prevent malicious set-points assigned to the primary control layer by an intruder breaching into the secondary control layer. This IDS is based on a derived operation region identification framework. Precisely, each point of common coupling bus is described with a non-linear multi-dimensional manifold where the network DEGs set-points are appearing as the domain variables constructing the feasible voltage co-domain. The IDS is equipped at the primary control layer of each DEG, once an anomalous point of common coupling voltage is detected, the IDS authenticates the set-point with the developed operation regions to decide if an intrusion occurred or not. Then, after the intrusion is detected the IDS perform a corrective action to regain normal operation. Additionally, in this dissertation, a single-loop direct decoupled active and reactive power control without phase-locked-loop (PLL) requirement for grid-connected inverters is developed. This developed control is proven to be asymptotically exponentially stable with Lyapunov theory. This proposed control is used as main primary control for the network DEGs to avoid instabilities correlated with PLL synchronization usage.