The attached PowerFactory project contains a transmission system with prepared measurement devices ready to run a State Estimation (ComSe).

The special thing in transmission system is that there are not only measurements for voltage (StaExtvmea), active (StaExtpmea) and reactive power (StaExtqmea) but also signals for tap position (StaExttapmea) and breaker position (StaExtbrkmea). These can also be taken into account in the state estimation. In this example, there are tap position and breaker signals available.

Especially the tap position measurements (StaExttapmea) need some more effort to be set up since there is a table to translate signals into tap positions in PowerFactory. The project shows an example for such implementation.

All measurements are based on the load flow, but the values got noised by a random measurement error in order to simulate a realistic case.

There are three study cases, where all study cases are prepared for an execution of the State Estimation command (ComSe).

• 01 State Estimation

In this state estimation all measurements are noised but the tap position and breaker in the model have no error.

• 02 Adapt Tap Position

This study case is based on the first one, but tap positions of some transformers where manipulated, i.e. the model doesn’t fit anymore with the situation where the values are measured. For this reason, the tap position signals need to be considered in the ComSe.

• 03 Adapt Breaker Position

Analog to study case 02, this study case is based on the first one, but with manipulated breaker signals. Without the consideration of the breaker signal in the preprocessing of the command, the algorithm would fail since the model is too far away from the basis of the measurements.

To investigate the estimation result, run a load flow in study case “01 State Estimation”, turn on the “Comparing of Result On/Off” and run the state estimation command. The difference of e.g. bus voltage or line currents observed in the Network Model Manager will be the real estimation error.