Multi-Level Power-Imbalance Allocation Control for Secondary Frequency Control of Power Systems

TL;DR

This paper introduces MLPIAC, a multi-level control strategy for large-scale power systems that enhances frequency regulation, reduces control costs, and improves transient response through a combination of centralized and distributed control.

Contribution

The paper proposes MLPIAC, a novel multi-level control law combining centralized and distributed control for large-scale power systems, with proven stability and improved transient performance.

Findings

MLPIAC achieves frequency restoration with minimal control cost.

The control law accelerates convergence and reduces oscillations.

Simulation results validate the effectiveness and stability of MLPIAC.

Abstract

A consensus-control-based multi-level control law named Multi-Level Power-Imbalance Allocation Control (MLPIAC) is presented for a large-scale power system partitioned into two or more areas. Centralized control is implemented in each area while distributed control is implemented at the coordination level of the areas. Besides restoring nominal frequency with a minimal control cost, MLPIAC can improve the transient performance of the system through an accelerated convergence of the control inputs without oscillations. At the coordination level of the control areas, because the number of the areas is smaller than that of nodes, MLPIAC is more effective to obtain the minimized control cost than the purely distributed control law. At the level of the control in each area, because the number of nodes is much smaller than the total number of nodes in the whole network, the overheads in the communications and the computations are reduced compared to the pure centralized control. The asymptotic stability of MLPIAC is proven using the Lyapunov method and the performance is evaluated through simulations.