Double-layered distributed transient frequency control with regional coordination for power networks

TL;DR

This paper introduces a two-layer distributed control strategy for power networks that ensures global stability and maintains transient bus frequencies within safe limits, combining model predictive control with real-time assistance.

Contribution

It presents a novel two-layer distributed control framework that guarantees frequency safety and stability with online optimization and real-time support.

Findings

Effective frequency regulation demonstrated on IEEE 39-bus network

Controllers are Lipschitz continuous and distributed

Achieves frequency safety and stability simultaneously

Abstract

This paper proposes a control strategy for power systems with a two-layer structure that achieves global stabilization and, at the same time, delimits the transient frequencies of targeted buses to a desired safe interval. The first layer is a model predictive control that, in a receding horizon fashion, optimally allocates the power resources while softly respecting transient frequency constraints. As the first layer control requires solving an optimization problem online, it only periodically samples the system state and updates its action. The second layer control, however, is implemented in real time, assisting the first layer to achieve frequency invariance and attractivity requirements.We show that the controllers designed at both layers are Lipschitz in the state. Furthermore, through network partition, they can be implemented in a distributed fashion, only requiring system information from neighboring partitions. Simulations on the IEEE 39-bus network illustrate our results.