The VDE FNN guideline “Technische Anforderungen an Netzbildende Eigenschaften inklusive der Bereitstellung von Momentanreserve” defines compliance tests to verify the grid-forming capabilities of power generation resources. In this work, these compliance tests are applied to a detailed grid-forming wind turbine model that incorporates multiple mechanical and electrical degrees of freedom as well as converter control dynamics. The model is subjected to frequency and voltage disturbance scenarios, including islanded operation, to assess its dynamic response under representative grid-forming operating conditions.

The primary objective of the compliance testing is the derivation of suitable dynamic equivalent models of grid-forming wind turbines using a Linear Parameter-Varying (LPV) framework. These equivalent models capture the behaviour of the turbine across different operating points while explicitly accounting for control saturation effects and asymmetrical response arising from physical and operational constraints of the primary energy resource. Control saturation effects are represented within the LPV framework by introducing additional scheduling parameters reflecting resource and converter limitations.

The derived LPV models are subsequently integrated into an aggregated dynamic representation of power system frequency behaviour. This framework enables the representation of varying system inertia constants as well as changing operational states of aggregated groups of grid-forming wind turbine systems. The resulting parameter-varying system model provides a scalable approach for representing large-scale power systems with significant penetration of grid-forming wind turbine technologies.

The proposed methodology establishes a systematic link between standardized compliance testing and large-scale dynamic system modelling, thereby supporting the development of realistic system-level studies for future low-inertia power systems.