Analysis and Control Design for TCSC and PSS in a SMIB System Using Hopf Bifurcation

, M.Sc. Thesis Sharif University of Technology Yasaei, Yasser (Author) ; Karimi, Masoud (Supervisor)

Abstract

Analysis and design of power systems are challenging due to ever increasing dimension of the system and also the nonlinearities involved in the system. The conventional approach is to use linear analysis tools and then investigate the nonlinear impacts by the means of computer simulations. This requires great deal of trial and error and it is not always a timely approach. In this project, we initiate a comprehensive nonlinear analysis for a single-machine infinite-bus system by studying a Hopf bifurcation in its dynamics. We use results of our nonlinear analysis to study how a capacitive compensation such as TCSC works. Subsequently, we design a nonlinear controller for a PSS to have...

Design of a nonlinear power system stabilizer

, Article IEEE International Symposium on Industrial Electronics, 4 July 2010 through 7 July 2010 ; July , 2010 , Pages 143-147 ; 9781424463916 (ISBN) Yasaei, Y ; Karimi Ghartemani, M ; Bakhshai, A ; Parniani, M ; Sharif University of Technology

2010

Abstract

This paper presents a new controller for power system stabilizer (PSS) that, unlike the conventional linear controllers, consists of both a linear and a nonlinear part. The linear part is properly designed to improve the small-signal stability margin and the damping of the local electromechanical modes. The nonlinear part is then designed to improve transient stability margin of the system without violating the features offered by the linear controller. Both parts are designed based on a perspective which attributes the system oscillations to a Hopf bifurcation (HB) phenomenon. More specifically, the design of the nonlinear part is done through the definition of a nonlinear index that...

Input-output linearisation of a fourth-order input-affine system describing the evolution of a three-phase/switch/level (Vienna) rectifier

, Article IET Power Electronics ; Volume 4, Issue 8 , 2011 , Pages 867-883 ; 17554535 (ISSN) Ansari, R ; Feyzi, M. R ; Akbari Hamed, K ; Sadati, N ; Yasaei, Y ; Ouni, S ; Sharif University of Technology

2011

Abstract

This study presents an analytical approach for proper selection of output functions to be regulated for the Vienna rectifier such that the resultant closed-loop systems are minimum phase. Specifically, two different adaptive control methodologies based on the input-output linearisation are developed and categorised. In the first category, three output functions are introduced and imposed to be zero by using three dynamic feedback laws. On the basis of states to be regulated, four different cases are studied and it is shown that only one of these cases results in a one-dimensional zero dynamics with an asymptotically stable equilibrium point. In the second category, two output functions are...