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My machine is a GE frame 9 single shaft, with Mark V for GT/ST and Foxboro for DCS.
I've read in many posts that preselect load does not behave good in grid frequency response, which the TNR decreases when grid frequency drop. That is exactly what happened in my plant.
During normal operations, we set the Mark V control to Remote mode, and the load control is controlled by foxboro. Operators put the load setpoint in Foxboro to control machine load. In this case, the preselect mode is disabled or still alive?
My TNR dropped to the foxboro load setpoint during grid frequency disturbance, so I can pretty much assume pre-select is somehow active. The question is, how to disable it in my case so it can support the grid during frequency response?
Need some good advice to enlighten me
Thanks
I've read in many posts that preselect load does not behave good in grid frequency response, which the TNR decreases when grid frequency drop. That is exactly what happened in my plant.
During normal operations, we set the Mark V control to Remote mode, and the load control is controlled by foxboro. Operators put the load setpoint in Foxboro to control machine load. In this case, the preselect mode is disabled or still alive?
My TNR dropped to the foxboro load setpoint during grid frequency disturbance, so I can pretty much assume pre-select is somehow active. The question is, how to disable it in my case so it can support the grid during frequency response?
Need some good advice to enlighten me
Thanks