Title: Unified Smith predictor and H∞ loop shaping for load frequency control with delay

Authors: Ashu Ahuja; Shiv Narayan; Jagdish Kumar

Addresses: Electrical Engineering Department, Maharishi Markandeshwar University, Mullana, India ' Electrical Engineering Department, PEC University of Technology, Chandigarh, India ' Electrical Engineering Department, PEC University of Technology, Chandigarh, India

Abstract: A fixed-structure controller based on robust H∞ loop shaping for load frequency control (LFC) of two area system having communication delay is designed in this paper. The delay complicates the design and implementation of the controller. Unified Smith Predictor (USP) has been analysed to convert delayed plant to a delay free augmented plant. A robust controller is designed for the augmented plant by formulating an optimisation problem using H∞ loop shaping performance condition and is solved by using genetic algorithm (GA). It is shown that designed controller has simpler structure than conventional H∞ loop shaping controller and ensures stable dynamic performance.

Keywords: communication delay; unified Smith predictor; USP; H-infinity loop shaping; genetic algorithms; load frequency control; LFC; delay; controller design.

DOI: 10.1504/IJSCC.2016.077407

International Journal of Systems, Control and Communications, 2016 Vol.7 No.3, pp.240 - 254

Received: 11 Jul 2015
Accepted: 04 Jan 2016
Published online: 29 Jun 2016 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article