S
Dear All,
I was gone through many threads in control.com. However finally i got confused and didn't get the answer. everywhere lengthy replies which is making more confusion and troublesome.
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.
1) the generator var capability shall always depends on its cold gas temperature with respect to MW. lets suppose when the var limits are high for the given MW allow you to go high var (say 100 mvar). At this moment if still grid is asking to increase more kv means...How can we increase the var window (by increasing the tap or decreasing the tap of a Step up transformer)??..if so we increase or decrease how the var generating capability of the generator increases???
2) why voltage control not provided in GE D11 steam turbine and why all the time both var and pf controls are in enabled condition. where as GE 9fa gas turbine only one control will be in service any time(either var or pf or voltage)?? kindly differentiate why it is like this
3) can i say (volt and pf and var controls) are sub controls of AVR.??
I was gone through many threads in control.com. However finally i got confused and didn't get the answer. everywhere lengthy replies which is making more confusion and troublesome.
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.
1) the generator var capability shall always depends on its cold gas temperature with respect to MW. lets suppose when the var limits are high for the given MW allow you to go high var (say 100 mvar). At this moment if still grid is asking to increase more kv means...How can we increase the var window (by increasing the tap or decreasing the tap of a Step up transformer)??..if so we increase or decrease how the var generating capability of the generator increases???
2) why voltage control not provided in GE D11 steam turbine and why all the time both var and pf controls are in enabled condition. where as GE 9fa gas turbine only one control will be in service any time(either var or pf or voltage)?? kindly differentiate why it is like this
3) can i say (volt and pf and var controls) are sub controls of AVR.??