What is FGMO mode of operation?
Free Governor Mode OperationThe mode of governor operation which compensates the change in frequency by changing the generation is called Free Governor Mode Operation(FGMO). In a word, FGMO is the variation of generation according to the frequency.
The parameters of FGMO
👉 Droop
👉 Dead band
👉 Load limiter
👉 Ramp rate
👉 Amount of load under FGMO
Droop
It is the amount of speed (or frequency) change, which causes the change in generation from minimum to maximum. Normal range is 4% to 8%.
Dead Band
The limit of frequency inside which the FGMO do not respond is called dead band. If the dead band is not set that means kept zero, then every moment the load will continue to change as the frequency never possible to keep at it's rated value.
Ramp Rate
The variation of generation with respect to time is known as Ramp rate. It is mainly dependent on the ability of turbine. Higher the ramp rate, good for power system/grid but hurmful for turbine. Lower the ramp rate, good for machine or turbine but it is not good for system/grid.
Load Limiter
The Upper limit and the lower limit of generation of the machine need to be fixed. The load of the generator varies from the set value according to the setting of droop and frequency deviation but load limiter will restrict the generation within it's set value.
Total load under FGMO
The generation will vary according to frequency deviation and droop set. If the frequency deviation is more, then the load of machine may vary in high amount from it's set value even from 0% to 100% load. So it's required to set the limit of amount, it will vary from load set value.
