Passivity based design of sliding modes for optimal Load Frequency Control

TL;DR

This paper introduces a distributed sliding mode control approach for optimal Load Frequency Control in power networks, enhancing economic dispatch and system stability through passivity-based design.

Contribution

It presents a novel passivity-based sliding mode control strategy for OLFC, relaxing previous dissipation and parameter assumptions.

Findings

Achieves frequency regulation and cost minimization simultaneously.

Provides a passivity-based sliding manifold design for turbine-governor systems.

Offers improved robustness over existing OLFC methods.

Abstract

This paper proposes a distributed sliding mode control strategy for optimal Load Frequency Control (OLFC) in power networks, where besides frequency regulation also minimization of generation costs is achieved (economic dispatch). We study a nonlinear power network partitioned into control areas, where each area is modelled by an equivalent generator including voltage and second order turbine-governor dynamics. The turbine-governor dynamics suggest the design of a sliding manifold, such that the turbine-governor system enjoys a suitable passivity property, once the sliding manifold is attained. This work offers a new perspective on OLFC by means of sliding mode control, and in comparison with existing literature, we relax required dissipation conditions on the generation side and assumptions on the system parameters.