Sub-synchronous oscillations between FPC wind farms, VSC-HVDC links and nuclear power plants

Sub-synchronous oscillations between large synchronous generators and voltage source converters, VSCs is an emerging topic with the increased penetration of grid connected VSCs. There are several different study methods used for evaluating the risk for sub-synchronous oscillations.

In this report, the study methods for sub-synchronous oscillations including large synchronous generators and VSCs are evaluated regarding the suitability for different systems. Also, converter design and control are described with focus on the contribution to sub-synchronous oscillations.

It is shown that there are screening methods suitable for finding risks for possible sub-synchronous oscillations. For evaluating the risk of oscillations between a certain synchronous generator and a VSC, there are frequency scanning methods that can be used together with time domain simulations.


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Lena Max, Andreas Petersson, Pehr Hjalmarsson