An integrated design of robust decentralized observer and controller for load frequency control

TL;DR

This paper presents a novel integrated decentralized load frequency control design for multi-area power systems, optimizing global performance through simultaneous observer and controller design using $H_5$ optimization and LMI techniques.

Contribution

It introduces a new integrated design approach for decentralized LFC observers and controllers, considering inter-area interactions and bidirectional effects, using $H_5$ optimization and LMI methods.

Findings

The proposed method outperforms conventional decentralized designs in simulations.

The integrated design improves transient system performance.

The approach effectively manages inter-area interactions in multi-area power systems.

Abstract

This paper focuses on designing completely decentralized load frequency control (LFC) for multi-area power systems to achieve global optimized performance. To this end, a new concept of integrated design is introduced for designing the decentralized LFC observers and controllers simultaneously off-line, by taking into account of the interactions between areas and the bidirectional effects between the local observer and controller in each area. The integrated design in this paper is realized via $H_\infty$ optimization with a single-step linear matrix inequality (LMI) formulation. The LMI regional eigenvalue assignment technique is further incorporated with $H_\infty$ optimization to improve the closed-loop system transient performance. A three-area power system is simulated to validate the superiority of the proposed integrated design over the conventional decentralized designs.