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Our machine is GE 9fa with MkVie controller.
Generally when we are importing or exporting the Vars Generator Control is in Var Control. But when the Var setpoint is zero (not exporting or importing Vars from the grid), I observed the Generator Control changed to Voltage Control.
Does this Generator control changeover is automatic, if yes why its needed. Even though our Gas turbine have 3 controls (Var control, voltage control, Pf) all the time i observed generator control shifted to Var control when we are exporting or importing Vars to grid and if not its under voltage control.
To my knowledge from the posts in control.com i came to understand that Generator control in Pf mode leads to maximum efficiency (when PF=1 as setpoint)..Can anyone please clarify about this...
As well as we have GE D11 steam turbine where we have only pf/var control only but no voltage control available.And all the time both pf and var control are in enable condition. I was unable to understand one thing Pf setpoint is .8 and when we are exporting or importing vars that time Pf is almost near to 0.97 lagging or leading ...but never i have seen PF value reaching to .8 (i think its not desirable to reach even I know) but as both PF and Var control enabled at a time i was in a confusion.
Our Plant is configured into 3 blocks. Each block constitutes 2 Gas turbines with 2 HRSG's and one Common Steam turbine. Each Turbine has its own Generator with its own corresponding Generator Step up transformer. So..Total 9 Generators...(6 Gas turbine+ 3 Steam turbine).
Gas turbine having 52G as synchronizing breaker which lies b/w generator terminals and corresponding step up transformer..(52L all the time in close condition corresponding to Gas turbine), where as steam turbine having 52L (line breaker) as synchronizing breaker.
Generally Grid operators used to call us to increase or decrease Grid KV by 1 or 2 kv like that...So according to that we give var setpoint to each and every generator equally (sharing) almost....
To control the grid voltage we are adjusting the vars flow of all turbine generators producing power at that time...
Generally when we are importing or exporting the Vars Generator Control is in Var Control. But when the Var setpoint is zero (not exporting or importing Vars from the grid), I observed the Generator Control changed to Voltage Control.
Does this Generator control changeover is automatic, if yes why its needed. Even though our Gas turbine have 3 controls (Var control, voltage control, Pf) all the time i observed generator control shifted to Var control when we are exporting or importing Vars to grid and if not its under voltage control.
To my knowledge from the posts in control.com i came to understand that Generator control in Pf mode leads to maximum efficiency (when PF=1 as setpoint)..Can anyone please clarify about this...
As well as we have GE D11 steam turbine where we have only pf/var control only but no voltage control available.And all the time both pf and var control are in enable condition. I was unable to understand one thing Pf setpoint is .8 and when we are exporting or importing vars that time Pf is almost near to 0.97 lagging or leading ...but never i have seen PF value reaching to .8 (i think its not desirable to reach even I know) but as both PF and Var control enabled at a time i was in a confusion.
Our Plant is configured into 3 blocks. Each block constitutes 2 Gas turbines with 2 HRSG's and one Common Steam turbine. Each Turbine has its own Generator with its own corresponding Generator Step up transformer. So..Total 9 Generators...(6 Gas turbine+ 3 Steam turbine).
Gas turbine having 52G as synchronizing breaker which lies b/w generator terminals and corresponding step up transformer..(52L all the time in close condition corresponding to Gas turbine), where as steam turbine having 52L (line breaker) as synchronizing breaker.
Generally Grid operators used to call us to increase or decrease Grid KV by 1 or 2 kv like that...So according to that we give var setpoint to each and every generator equally (sharing) almost....
To control the grid voltage we are adjusting the vars flow of all turbine generators producing power at that time...