Power Augmentation Control

Under-frequency operation impacts efficient operation to the degree that nominally controlled turbine outputs which described by manufacturer, GE, can be exceeded in order to meet the specification defined Primary Frequency Control requirement by the National Grid Company (NGC).

As speed decreases, the compressor airflow decreases, reducing turbine output. If this normal output fall-off with speed results in loads less than the defined base load, power augmentation must be applied in order to eliminate inefficient operation and combined cycle output losses.