Roust Power System Stabilizer Design Using Kharitonov’s Theorem: A Case Study

Abstract

This paper proposes a robust power system stabilizer(PSS) for a steam synchronous generator in Barka II power station. The PSS should be capable of damping small-disturbance oscillations (inherently existing in power systems due to e.g. load changes, lines switching...etc.) within a certain settling time for different load conditions. Also, the proposed PSS must have the conventional structure and its parameters must not be violated. To achieve this goal, robust control provides many advantages. The suggested controller is tuned by the Kharitonov’s theorem and uses the standard structure employed in industry. The problem is cast into a nonlinear constrained optimization problem to achieve the desired settling time without violating the practical values of the controller parameters. Performance of the robust PSS is evaluated by several simulations in the presence of system uncertainty due to load changes.

Design of a robust PID-PSS for an uncertain power system with simplified stability conditions

“…The dynamic stability of the plant is improved by the addition of PSS. The settling time is around 4 s with single lead PSS [52], 2.5 s with double lead PSS [52], and 1.3 s with the proposed PID-PSS for all the three operating conditions. Thus, the proposed PID-PSS well damps out system oscillation for the given disturbance under the different loading conditions.…”

“…In [50], a frequency response matching technique is used to find suitable PSS and TCSC controller parameters. The design of control devices for engineeering applications are explained in [51], whereas the practical data of the Barka-II power station in Oman is used and PSS is designed for one of the gas units in [52].…”