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The fast developing power grid is facing more and more invisible critical threats with the introduction of FACTS, HVDC and renewable generation.
• Sub-synchronous Resonance (SSR) caused by capacitor compensated transmission lines
• Sub-synchronous Oscillation (SSO) caused by HVDC interconnections
• Sub-synchronous Oscillation (SSO) caused by renewable generation interconnections
The SSO/SSR is able to generate the large torques and internal forces on generator shaft, which will reduce greatly the life time of the shaft, and even break it.
SIFANG’s SSR/SSO series products provide a comprehensive protection, control and monitoring solutions for large turbine generator. The SSO/SSR solutions are able to be applied in all types of generator units and large rotating machinery as well. The powerful analysis functions are provided as below, and other professional applications to provide sophisticated technical achievement.
• Calculate and assessment mechanical fatigue
• Calculate torsional modal damping
• Calculate mechanical and electrical transient disturbance issues
It can continuously monitor generator shaft modes and damping, and display generator twist angle, modal frequency, torsional stress and torsional power in real-time. Once the torque amplitude exceeds the setting, torsional stress relay (TSR) will send alarm and trip command to avoid damage of rotor shaft. The SSR/SSO supplementary excitation damping controller can further reduce the generator shaft torsional vibration.