Title: Damping interarea oscillations in power systems using finite time terminal sliding mode control of the unified power flow controller
Authors: Sangram Keshari Routray; Rajesh Kumar Patnaik; P.K. Dash
Addresses: Department of Electrical Engineering, Siksha 'O' Anusandhan University, Bhubaneswar, India ' Department of Electrical Engineering, Siksha 'O' Anusandhan University, Bhubaneswar, India ' Department of Electrical Engineering, Siksha 'O' Anusandhan University, Bhubaneswar, India
Abstract: This paper presents a new nonlinear controller for unified power flow controller (UPFC) based on the Lyapunov's finite time terminal sliding mode concept. Further instead of controlling the direct and quadrature-axis currents of the series voltage source converter (VSC), the instantaneous real-and reactive power components are used as control variables. This mode of control dispenses the unmodelled dynamics of the VSC phase-locked loop system and produces a robust control for the active-reactive power, and dc voltage excursions. Computer simulation results are obtained for a variety of operating conditions for 3-machine 6-bus power system using the finite time terminal sliding mode control and the results are compared with a standard input-output feedback linearisation approach to validate the superiority of the proposed controller.
Keywords: unified power flow controller; UPFC; power system control; Lyapunov direct stability theorem; terminal SMC; sliding mode control; multimachine power systems; oscillation damping; nonlinear control; voltage source converter; VSC; simulation.
International Journal of Power and Energy Conversion, 2016 Vol.7 No.3, pp.259 - 291
Received: 23 Mar 2015
Accepted: 05 Jun 2015
Published online: 23 Aug 2016 *