In my power plant we have mark vi system for two frame Ge 6f gas turbines.
I am looking at the mark vi hmi where I've found gride code block, where thete are various control modes given. Among them there are two controls that catch my attention one is droop and other one is Deadband control
Operators told me that deadband is only active when machine is under 40 MW load (base load is 75 MW). There is a frequency given there around 0.15 Hz. So what is the role of this mode. How it is different from " lower band" which restricts the prime mover respond to frequency under lower band range.
Secondly I've seen some turbines that the droop setpoint is 8%. Which means when turbine speed is at 108% machine comes to no load so how does this is possible as at 105 % and 95 % the 52G opens on under and overfreq protections.
Thirdly in mark VI what are droop set point and reference values.
I am looking at the mark vi hmi where I've found gride code block, where thete are various control modes given. Among them there are two controls that catch my attention one is droop and other one is Deadband control
Operators told me that deadband is only active when machine is under 40 MW load (base load is 75 MW). There is a frequency given there around 0.15 Hz. So what is the role of this mode. How it is different from " lower band" which restricts the prime mover respond to frequency under lower band range.
Secondly I've seen some turbines that the droop setpoint is 8%. Which means when turbine speed is at 108% machine comes to no load so how does this is possible as at 105 % and 95 % the 52G opens on under and overfreq protections.
Thirdly in mark VI what are droop set point and reference values.
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