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PST (Phase Shifting Transformers)

Phase Shifting Transformers (PST), able to control active power by regulating the voltage phase angle difference between two nodes of the system, are a mature technology, used by TSOs in Europe for power flow control through preventive or curative strategies.

The operation principle is voltage source injection into the line by a series connected transformer, which is fed by a tapped shunt transformer. So, overloading of lines and loop-flows in Meshed Systems and in parallel line configurations can be eliminated.

However, the speed of phase shifting transformers for changing the phase angle of the injected voltage via the taps is very slow. Phase shifting transformers and similar devices using mechanical taps can only be applied for very limited tasks with slow requirements under steady state system conditions.


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