A
Hi, please bear with me on this one, even though it is connected to droop and freq I have a question that I can not seem to answer.
I have been through the past posts and the answer does not seem to jump out at me.
I do understand the relationship between droop machines and the grid/freq in that the machine speed is governed by the grid/freq.
• When at base load and the Freq drops, so the speed drops so the load drops (less speed/lower exhaust temp/less fuel...ect...ect...).
• When at part load and the Freq drops the diff in TNR – TNH will increase, so fuel flow will increase so load increases. (do I have that right? I think I have)?
Anyway the Question is….
If when in PLC Enabled (Plant Load Control) what is the function of the GT PFR (“Primary Frequency Regulation”) in relation to droop control and frequency?
We had a situation were when at min load the and in PLC (PFR was not enabled), the freq dropped which pulled our speed down, which took our load down and took us out of pilot premix in to sub-pilot pre mix. This gave us a run back.
Since we have had the PFR enabled we have seen the freq/speed drop so low (2984rpm) that an excessive speed error alarm came in on the DCS put the load remained steady (=/- 2mw).
At present we enable the PFR when we are above min load and disable it again when at min load,
Why?
and
Should the PFR regulate with the freq and maintain load, or is it possible that we could go into another run back with the PFR enabled at min load?
Thanks
I have been through the past posts and the answer does not seem to jump out at me.
I do understand the relationship between droop machines and the grid/freq in that the machine speed is governed by the grid/freq.
• When at base load and the Freq drops, so the speed drops so the load drops (less speed/lower exhaust temp/less fuel...ect...ect...).
• When at part load and the Freq drops the diff in TNR – TNH will increase, so fuel flow will increase so load increases. (do I have that right? I think I have)?
Anyway the Question is….
If when in PLC Enabled (Plant Load Control) what is the function of the GT PFR (“Primary Frequency Regulation”) in relation to droop control and frequency?
We had a situation were when at min load the and in PLC (PFR was not enabled), the freq dropped which pulled our speed down, which took our load down and took us out of pilot premix in to sub-pilot pre mix. This gave us a run back.
Since we have had the PFR enabled we have seen the freq/speed drop so low (2984rpm) that an excessive speed error alarm came in on the DCS put the load remained steady (=/- 2mw).
At present we enable the PFR when we are above min load and disable it again when at min load,
Why?
and
Should the PFR regulate with the freq and maintain load, or is it possible that we could go into another run back with the PFR enabled at min load?
Thanks