Publikationen - Netze für Erneuerbare Energien

Eberhard Waffenschmidt, Patrick Littau, Christian Pelikan,
"Evaluation of syncrophasor use in distribution grids to estimate the regional grid state",
ETG Congress 2017, Bonn, 28.-29. Nov. 2017.

It is known that synchrophasor (also "voltage angle") measurements in the transmission grid can retrieve information of the regional power grid state. This makes such measurements attractive for decentralized grid components. If they could share information about synchrophasor measurements, they could use the information about the regional grid state for independent operation.
However, most of the decentralized components are connected to the distribution grid in the medium voltage or low voltage grid. Therefore, we suggest to measure the syncrophasor (also "voltage angle") at the device's point of connection to derive such information. On the way to the connection point of a device in the low voltage grid, this syncrophasor may change. Therefore, this publication investigates, how the syncrophasor changes on this way. This is done by simulations.
As a result, the voltage angle has a variation of about 1.5 in the medium voltage branch and 6 at the end of the low voltage branch. This is significant smaller than the anticipated syncrophasor variations in the transmission grid of up to 60. Therefore, the simulations give an indication that syncrophasor measurements in the distribution grid might be used as an indication for a regional excess or demand of power.


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Statistic distribution of voltage angle differerence in the medium and low voltage branch of the investigated exemplary grid structrure (simulation).

E.Waffenschmidt, 30.Nov.2017