The rapid expansion in power transmission for the integration of large-scale renewables complemented by infrastructure reinforcements in the form of series compensation poses the threat of subsynchronous resonance (SSR). However, existing and future HVdc links can be effectively used to mitigate this phenomenon. To investigate this, a HIL test was designed, operated and tested at Cardiff University. The series-compensated AC network under consideration was modelled in the RSCAD platform. This was connected to a point-to-point PWM VSC analogue HVdc test-rig through the RTDS analogue output via a grid simulator. The RTDS analogue input feeds back the analogue signals from the dSPACE control card of the VSC test-rig. The feedback signals are used to damp SSR upon occurrence in the nearby synchronous generator.
Tibin Joseph • Cardiff University