Using SVC for SSO Damping and Its Side-effects on the AC System

Abstract

This paper briefly introduces the first project in China using a Static Var Compensator (SVC) to damp Sub-Synchronous Oscillations (SSO) excited by fixed series compensation. Since the SVC function of this project is to damp SSO, it is necessary to study its side-effects on the ac system when damping SSO. A real time digital simulator (RTDS) model for this project is developed and a closed-loop test platform is established, which is comprised of an RTDS and a physical SVC controller. Based on the platform, this paper studies the side-effects of the SVC including transformer overload, ac system transient stability and relay malfunction. Simulation and theoretical results show that all these sideeffects are acceptable and will not effect the operation of the ac system.

Impact of Fixed/Variable Speed Hydro, Wind, and Photovoltaic on Sub-Synchronous Torsional Oscillation—A Review

“…Furthermore, a system model is constructed based on the real-time digital simulator. Likewise, series capacitor compensation caused by SSO is mitigated by the dampingcontroller SVC based on the generalized phase compensation approach [125]. Initially, eigenvalue analysis was conducted on a multi-machine system.…”

Comparison of Application of SVC and STATCOM on Suppressing Subsynchronous Oscillation

“…The reactive power output range of STATCOM is -40Mvar ~ 40Mvar. In order to compare SVC with STATCOM in the effect of suppressing SSO [12][13][14], SVC and STATCOM both are parallel connected at generator bus via a connection transformer (ratio is 25kV/25kV). The schematic diagrams are shown in Fig.…”