Why the series compensated transmission lines connected to hydro power stations don't face the problem of subsynchronous resonance ?

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Ahmad Al Khraisat

https://www.reddit.com/r/ElectricalEngineering/comments/yxno4u/why_the_series_compensated_transmission_lines/

https://www.spp.org/documents/22902/17_ju4715%20-%20spp%20-%20review%20of%20series%20compensation%20-%20final%20-%202.1.pdf

Article IEEE Committee Report. Reader's guide to subsynchronous resonance

Series compensated transmission lines that are connected to hydroelectric power stations typically do not experience the problem of subsynchronous resonance (SSR) for several reasons.

First, series compensation (the use of capacitors or reactors in series with the transmission line) can help to stabilize the transmission line and reduce the risk of SSR. Series compensation can reduce the line impedance and increase the system damping, which can help to suppress the oscillations that can lead to SSR.

Second, hydroelectric power stations typically have relatively low inertia and fast-acting governors, which can help to dampen oscillations and reduce the risk of SSR. The governors of hydroelectric power stations can quickly respond to changes in system frequency and adjust the power output of the station accordingly, which can help to stabilize the system and prevent the development of oscillations.

Finally, hydroelectric power stations are typically operated in a load-following mode, which means that they can adjust their power output in response to changes in demand. This can help to dampen oscillations and reduce the risk of SSR, as the system frequency is less likely to be disturbed by changes in load.

Overall, the combination of series compensation, low inertia, and load-following operation can help to reduce the risk of SSR in transmission lines connected to hydroelectric power stations.