Resonances and Oscillations in Wind Farms and Solar PVs

Grid integration and operation of wind farms and solar PV farms face many stability challenges. In Europe, high-frequency resonances have been known as a significant challenge for offshore wind farms grid integration. In Australia, 5-20 Hz oscillations have been observed in solar PV farms. Furthermore, very low frequency oscillations in the range of 0.01-1 Hz oscillations associated to power plant level control have been observed. While those IBR related phenomena are new to the power grid industry, we may also draw lessons from the grid’s prior experiences with FACTS devices. For example, weak grid stability issues of SVC and mitigating strategies have been thoroughly studied in the past decades. This panel session will include talks from experts around the world to give insights on the current issues facing the power grid industry, e.g., high-frequency resonances in wind farms, subsynchronous oscillations in solar PVs, and very low frequency var oscillations. The session also includes a presentation on how to detect stability issues at the planning stage using EMT models and a presentation on lessons learned from the prior experience in FACTS operation in weak grids.