S
Dear all,
our machine GE 9fa with MK vie controller. Generally Gas turbine in base load operation means it is under cpr/cpd exhaust temperature control (when we give the command Load select as baseload)
But recently by seeing some posts in control.com I have got one doubt how can we operate the machine in base load with droop speed control. as when we are saying base load all the time i used to consider it is under cpr/cpd exhaust temperature control.
Is it in this way. am i right?
Load selection will be in preselect load only, but we will give the MW setpoint near to the base load rating so that it will stay in droop speed control without transferring to exhaust temperature control or is there some other way? kindly clarify...
and in case of isochronous control i understand that the controller tries to maintain the grid frequency which is vice versa to other controls of Gas turbine like exhaust temp control and droop speed control. but my concern is in case of other than isochronous control grid frequency effects the machine operational output frequency and hence the output produced by gas turbine. so, in isochronous control as though the recent posts i understand the machine will adjust the fuel flow to maintain the grid frequency which is very odd to hear (very hard to imagine gas turbine thermal stresses even though grid is some what reasonably stable). is there any grid frequency set point when operating in isochronous control???
Another doubt...
few weeks back our machine operated on baseload that time TTXM is 629 degc.. but where as during preselect load operation the TTXM is maintaining around 648 degc. During base load operation it is following TTRX as TTRXB (speed biased) which is minimum value. but in case of preselect load operation TTRX is not TTRXB (more value) but less value than TTRXB. why?
As in base load and under exhaust temperature control speedtronic tries to put more fuel to maintain the higher exhaust temperatures. but why its not happening here?
our machine GE 9fa with MK vie controller. Generally Gas turbine in base load operation means it is under cpr/cpd exhaust temperature control (when we give the command Load select as baseload)
But recently by seeing some posts in control.com I have got one doubt how can we operate the machine in base load with droop speed control. as when we are saying base load all the time i used to consider it is under cpr/cpd exhaust temperature control.
Is it in this way. am i right?
Load selection will be in preselect load only, but we will give the MW setpoint near to the base load rating so that it will stay in droop speed control without transferring to exhaust temperature control or is there some other way? kindly clarify...
and in case of isochronous control i understand that the controller tries to maintain the grid frequency which is vice versa to other controls of Gas turbine like exhaust temp control and droop speed control. but my concern is in case of other than isochronous control grid frequency effects the machine operational output frequency and hence the output produced by gas turbine. so, in isochronous control as though the recent posts i understand the machine will adjust the fuel flow to maintain the grid frequency which is very odd to hear (very hard to imagine gas turbine thermal stresses even though grid is some what reasonably stable). is there any grid frequency set point when operating in isochronous control???
Another doubt...
few weeks back our machine operated on baseload that time TTXM is 629 degc.. but where as during preselect load operation the TTXM is maintaining around 648 degc. During base load operation it is following TTRX as TTRXB (speed biased) which is minimum value. but in case of preselect load operation TTRX is not TTRXB (more value) but less value than TTRXB. why?
As in base load and under exhaust temperature control speedtronic tries to put more fuel to maintain the higher exhaust temperatures. but why its not happening here?