All 'large' generators that are under grid code are required to provide mandatory frequency response.
Mandatory frequency response helps to fulfil NG's obligation to ensure sufficient generation and/or demand is held in automatic readiness to manage all frequency changes.
There is three mandatory frequency response modes:
-Primary - provision on additional active power within 10 seconds, sustained for 20 seconds
- Secondary - provision of additional active power within 30 seconds, sustained for 30 minutes
- High - The reduction in active power within 10 seconds of an event and sustained indefinitely.
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