Title: Robust coordinated control of damping controllers for improving of dynamic stability in multi-machine environment

Authors: Amin Safari; Hossein Shayeghi; Navid Taghizadegan; Yahya Ghorban Movahed

Addresses: Department of Electrical Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran ' Technical Engineering Department, University of Mohaghegh Ardabili, Ardabil, Iran ' Department of Electrical Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran ' Department of Electrical Engineering, Heris Branch, Islamic Azad University, Heris, Iran

Abstract: In this paper, in order to improve the dynamic stability of multi-machine power system coordinated design of the unified power flow controller (UPFC) damping controller and power system stabiliser (PSS) is demonstrated. The coordinated design problem of PSS and UPFC damping controller over a wide range of loading conditions is converted to a constraint optimisation problem which is solved by a particle swarm optimisation (PSO) technique. The robustness of the coordinated stabilisers is warranted at wide range of operating conditions of power system. The effectiveness and robustness of the procedure are demonstrated through digital simulations on a four-machine power system embedding a UPFC and two PSSs. The performance of the coordinated stabilisers is presented through the non-linear simulation and some dynamic indices. The results of these studies illustrate that the proposed coordinated controllers have a distinguished capability in damping of inter-area oscillations and enhance greatly the dynamic stability of the power system.

Keywords: unified power flow controller; UPFC; power system stabiliser; PSS; particle swarm optimisation; PSO; damping control; coordinated control; multi-machine power systems; robust control; dynamic stability; oscillations.

DOI: 10.1504/IJAAC.2014.064163

International Journal of Automation and Control, 2014 Vol.8 No.3, pp.260 - 276

Received: 07 Jan 2014
Accepted: 29 Mar 2014
Published online: 28 Aug 2014 *

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