Improvement of PGU Simulation Models based on FRT Test Rig with adjustable Voltage Vector and Short-Circuit Power

This paper shows influences on the behaviour of power generating units due to variations in the grid impedance. In order to investigate these effects, an alternative transformer based test equipment has been developed that allows for simultaneous voltage vector magnitude and angle jumps. A complex transformation ratio is defined to prove electrical equivalence of the test systems in combination with additional impedances. It is assumed, that simulation models can be improved by including additional measurements into the validation process which are not part of the prototype measurements yet.