Analysis and study subsynchronous resonance (SSR) in Tabriz thermal power plant using thyristor controlled series compensator

Compensation technique using series capacitor is very cost-effective way to increase power transfer capability. But use of the series capacitors may cause Oscillations Subsynchronous Resonance (SSR). In this paper Subsynchronous Resonance phenomenon investigated in compensation networks with series capacitor. And shown that unlike a fixed series compensation effect in creating the SSR phenomenon, if the TCSC (thyristor controlled series compensator) to be used for series compensated transmission network, with Suitable control of the TCSC, can adjusted Subsynchronous Oscillations in compensated networks with fixed capacitor. Analysis method that is used in this paper, Is time domain analysis. That simulation achieved with electromagnetic transient model of power system elements. In this paper NGH scheme, is used for damping Subsynchronous Oscillations. Simulations carried out in Software PSCAD/ EMTDC. And performance this Scheme for damping Subsynchronous Oscillations According to the results obtained from simulations on the two systems studied, is shown.