Table of Contents
Advances in Power Electronics
Volume 2011, Article ID 621818, 8 pages
http://dx.doi.org/10.1155/2011/621818
Research Article

Investigation of SSR Characteristics of Hybrid Series Compensated Power System with SSSC

1School of Electrical Engineering, VIT University, Vellore 632014, India
2Canara Engineering College, Benjanapadavu, Bantwal, Mangalore 574219, India

Received 2 November 2010; Accepted 13 March 2011

Academic Editor: Henry S. H. Chung

Copyright © 2011 R. Thirumalaivasan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The advent of series FACTS controllers, thyristor controlled series capacitor (TCSC) and static synchronous Series Compensator (SSSC) has made it possible not only for the fast control of power flow in a transmission line, but also for the mitigation of subsynchronous resonance (SSR) in the presence of fixed series capacitors. SSSC is an emerging controller and this paper presents SSR characteristics of a series compensated system with SSSC. The study system is adapted from IEEE first benchmark model (FBM). The active series compensation is provided by a three-level twenty four-pulse SSSC. The modeling and control details of a three level voltage source converter-(VSC)-based SSSC are discussed. The SSR characteristics of the combined system with constant reactive voltage control mode in SSSC has been investigated. It is shown that the constant reactive voltage control of SSSC has the effect of reducing the electrical resonance frequency, which detunes the SSR. The analysis of SSR with SSSC is carried out based on frequency domain method, eigenvalue analysis and transient simulation. While the eigenvalue and damping torque analysis are based on linearizing the D-Q model of SSSC, the transient simulation considers both D-Q and detailed three phase nonlinear system model using switching functions.