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.
Highlights
Power transfer capability of long transmission line is limited by the transient stability limit
We have presented the analysis and simulation of a hybrid series compensated system with synchronous Series Compensator (SSSC)
The application of D-Q model is validated by the transient simulation of the three-phase model of SSSC
Summary
Power transfer capability of long transmission line is limited by the transient stability limit. The resonant frequency fer of the compensated line depends on the level of compensation of the line inductance but is always subsynchronous since, in practice, the compensation ratio is less than unity It is the coupling of Advances in Power Electronics this subsynchronous electrical transmission line resonance to the mechanical resonances of a multistage turbine-generator that gives rise to the phenomenon of SSR. In this paper fixed series capacitor and active compensation provided by three-level twenty four-pulse VSC-based SSSC are considered. The major objective is to investigate SSR characteristics of the series compensated system with SSSC using both linear analysis and nonlinear transient simulation. It is shown that the constant reactive voltage control of SSSC has the effect of reducing the electrical resonance frequency, which detunes SSR.
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