In a nutshell
- The Application Rule implements requirements of the European Network Code on Emergency and Restoration (NC ER)
- Updating of underfrequency-dependent load shedding ensures its effectiveness in the future
Manual or automatic final measures play a major role in case of malfunctions and hazards. In critical grid situations, they make a decisive contribution to the safe and reliable operation of the European electricity supply system.
As a rule, manual final measures taken by transmission and distribution system operators are sufficient. These measures are already defined in the cascade requirements (VDE-AR-N 4140). These include, for example, the reduction of in-feed from generation plants in the event of grid constraints. Automatic final measures are only used in exceptional cases if there is not enough time to carry out manual measures.
The Network Code on Emergency and Restoration (EU Regulation 2017/2196) defines EU-wide binding requirements for automatic final measures. The VDE-Application Rule VDE-AR-N 4142 implements these requirements for Germany. In the Application Rule, the Network Code distinguishes between:
- Measures for underfrequency-dependent load shedding
- Measures in case of overfrequency
- Measures to avoid a stress collapse