An interval type-2 fuzzy logic controller for TCSC to improve the damping of power system oscillations

Abstract

In this paper an interval type-2 fuzzy logic controller (IT2FLC) was proposed for thyristor controlled series capacitor (TCSC) to improve power system damping. For controller design, memberships of system variables were represented using interval type-2 fuzzy sets. The three-dimensional membership function of type-2 fuzzy sets provided additional degree of freedom that made it possible to directly model and handle uncertainties. Simulations conducted on a single machine infinite bus (SMIB) power system showed that the proposed controller was more effective than particle swarm optimization (PSO) tuned and type-1 fuzzy logic (T1FL) based damping controllers. Robust performance of the proposed controller was also validated at different operating conditions, various disturbances and parameter variation of the transmission line parameters.

Key words： power system oscillations; thyristor controlled series capacitor (TCSC); type-2 fuzzy logic system; interval type-2 fuzzy logic controller (IT2FLC)

Acknowledgements

This work was supported by the quality improvement program center of Indian Institute of Technology Roorkee and All India Council of Technical Education, New Delhi, India.

Notation

X_C Capacitive reactance of TCSC

X_P Inductive reactance of TCSC

k Compensation ratio

a Firing angle of TCSC

X_T Transformer reactance

V_T Terminal voltage of generator

V_B Infinite bus voltage

X_L Reactance of transmission line

d Rotor angle of generator

w Rotor speed of generator

P_m Mechanical power input to generator

P_e Electrical power output of generator

M Generator inertia constant

D Damping coefficient of generator

s TCSC conduction angle

X_dd-axis synchronous reactance of generator

K_A Gain of excitation system

X^'_dd-axis transient reactance of generator

T_A Time constant of excitation system

E_fd Excitation system voltage

E'_q Generator terminal voltage

w_b Synchronous speed of generator

X_q q-axis synchronous reactance of generator

X^'_qq-axis transient reactance of generator

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