Title: Damping of low frequency oscillations in a hydro-thermal power system using thyristor controlled series compensator

Authors: M. Deepak; Dibyaranjan Senapati; Rajesh Joseph Abraham

Addresses: Department of Avionics, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala, 695 547, India ' ISRO Satellite Centre, Indian Space Research Organisation, Vimanapura, Bangalore, 560 017, India ' Department of Avionics, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala, 695 547, India

Abstract: Thyristor controlled series capacitor (TCSC) is a series type flexible AC transmission system (FACTS) device which can effectively change the impedance of a transmission line. This paper is concerned with developing a linear incremental model for a TCSC and its application to improve the performance of automatic generation control (AGC) of two-area interconnected hydrothermal power system. The optimised integral gain values of AGC are obtained using integral squared error (ISE) technique. A quadratic performance index considering a step load perturbation in either of the areas is considered for minimisation. Simulation results suggest that, incorporating a TCSC is very effective in damping the low frequency oscillations in area frequencies as well as the tie-power after a sudden load perturbation in any of area compared to AGC without TCSC.

Keywords: thyristor controlled series capacitor; TCSC; automatic generation control; AGC; ISE technique; integral squared error; oscillation damping; low frequency oscillations; hydro-thermal power; flexible AC transmission system; FACTS; step load perturbation; simulation.

DOI: 10.1504/IJPEC.2017.080827

International Journal of Power and Energy Conversion, 2017 Vol.8 No.1, pp.1 - 19

Received: 16 Apr 2015
Accepted: 06 Jul 2015
Published online: 09 Dec 2016 *

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