OPTIMAL SWITCHED FEEDBACK CONTROLLER DESIGN FOR THE SIMULTANEOUS COORDINATED DESIGN OF UPFC AND PSS IN POWER SYSTEM

Abstract

In this paper, an optimal switched feedback controller
is designed which automatically finds a controller rather
than having to make certain arbitrary choices as presented in
conventional approch. This novel approach is presented for the
simultaneous coordinated design of Unified power flow controller
(UPFC) and Power System Stabilizer (PSS) in order to enhance
the damping of oscillations in a Single Machine Infinite Bus
(SMIB) power system. On the basis of the linearized Phillips-
Herffron model, the coordinated design problem of PSS and
UPFC is formulated as switching between two state feedback
controller gains; one with respect to optimal controller and
based on the location of closed loop eigenvalues from optimal
control design another controller is designed using pole placement
method. To ensure the betterness of simultaneous coordinated
design of PSS & UPFC a preliminary control analysis is done by
considering uncoordinated control of PSS & UPFC. The proposed
feedback switching model presented here is tested on the modified
SMIB linearised phillips heffron model of a power system using
MATLAB/SIMULINK
R platform.