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from the mark v department...
generator seconder frequence control
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Hi..
Dear Experts
I m work in a CCPP which have to GT and ST. I have a question about frequance control. How is seconder frequance control on the generator? How is control Mark V? (We have type to 336X104 generator of ELIN.)
Thanks to you reply..
Dear Experts
I m work in a CCPP which have to GT and ST. I have a question about frequance control. How is seconder frequance control on the generator? How is control Mark V? (We have type to 336X104 generator of ELIN.)
Thanks to you reply..
| Posted by CSA  on 29 September, 2012 - 10:08 am |
mark v,
Secondary frequency control is USUALLY done by some external system, typically called AGC (Automatic Governor Control). The signal to the Speedtronic Mark V can be either discrete raise/lower signals (contact inputs to the Mark V), or sometimes it's done using a 4-20 mA signal from the external control "system" to a Mark V 4-20 mA input. It would be necessary to look at the CSP and I/O assignment and -configuration of the Mark V at your site to be sure how (or even if) secondary frequency control is being done at your site.
A lot of Customers and operators believe the Mark V does both primary- and secondary frequency control "automatically". Primary frequency control (NOT Primary Frequency Response--which is something very different and an option sold by GE and its packagers) is accomplished using Droop Speed Control. Secondary frequency control is almost never done by the Speedtronic turbine control panel; the Speedtronic responds to inputs from another system which is monitoring actual frequency and a frequency reference and sends signals to the Speedtronic to increase or decrease load as necessary to maintain frequency.
I hope this helps!
You can use your preferred Internet search engine to learn about the industry- and regulatory definitions of primary- and secondary frequency control. The EU grid regulatory agency has an "excellent" document on the subjects.
By the way, if you want information on Droop Speed Control, the topic has been covered ad nauseum on control.com. Use the 'Search' feature at the far right of the Menu bar at the top of every control.com webpage. [HINT: Use the term "droop speed control"--with double quotes.]
The type of generator being driven by the turbine is of no consequence to frequency control. Generators are really very "dumb" devices, converting torque to amperes, and not much more than that.
Secondary frequency control is USUALLY done by some external system, typically called AGC (Automatic Governor Control). The signal to the Speedtronic Mark V can be either discrete raise/lower signals (contact inputs to the Mark V), or sometimes it's done using a 4-20 mA signal from the external control "system" to a Mark V 4-20 mA input. It would be necessary to look at the CSP and I/O assignment and -configuration of the Mark V at your site to be sure how (or even if) secondary frequency control is being done at your site.
A lot of Customers and operators believe the Mark V does both primary- and secondary frequency control "automatically". Primary frequency control (NOT Primary Frequency Response--which is something very different and an option sold by GE and its packagers) is accomplished using Droop Speed Control. Secondary frequency control is almost never done by the Speedtronic turbine control panel; the Speedtronic responds to inputs from another system which is monitoring actual frequency and a frequency reference and sends signals to the Speedtronic to increase or decrease load as necessary to maintain frequency.
I hope this helps!
You can use your preferred Internet search engine to learn about the industry- and regulatory definitions of primary- and secondary frequency control. The EU grid regulatory agency has an "excellent" document on the subjects.
By the way, if you want information on Droop Speed Control, the topic has been covered ad nauseum on control.com. Use the 'Search' feature at the far right of the Menu bar at the top of every control.com webpage. [HINT: Use the term "droop speed control"--with double quotes.]
The type of generator being driven by the turbine is of no consequence to frequency control. Generators are really very "dumb" devices, converting torque to amperes, and not much more than that.
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