Distributed transient frequency control in power networks
It addresses the challenge of frequency control in low-inertia power networks for system operators, but the results are simulation-based and incremental.
The paper proposes a distributed control strategy for power networks that maintains transient frequencies of selected buses within safe regions while ensuring asymptotic stability, demonstrated on the IEEE 39-bus system.
Modern power networks face increasing challenges in controlling their transient frequency behavior at acceptable levels due to low inertia and highly-dynamic units. This paper presents a distributed control strategy regulated on a subset of buses in a power network to maintain their transient frequencies in safe regions while preserving asymptotic stability of the overall system. Building on Lyapunov stability and set invariance theory, we formulate the transient frequency requirement and the asymptotic stability requirement as two separate constraints for the control input. Hereby, for each bus of interest, we synthesize a controller satisfying both constraints simultaneously. The controller is distributed and Lipschitz, guaranteeing the existence and uniqueness of the trajectories of the closed-loop system. Simulations on the IEEE 39-bus power network illustrate the results.