Suppose my gas turbine is connected to grid, its frequency is dictated by grid.
Freq decreases because as soon as extra load is added the rpm drops and stored rotational energy serves the increment of load
But as frequency decreases the mass flow of gas turbine decreases which means the net output decreases.
A bus load is 75 MW and my generator is supplying 75 MW that its maximum load, Now i have added 5 MW to gas turbine now what will happen.
Gas turbine is already at maximum load.
Now it is possible that gas turbine picks this extra 5 MW by utilizing its stored rotational energy but this has other issue because as soon freq reduces the output decreases. Then how the MWs on both side is balanced
Hope this article helps
https://doi.org/10.1049/iet-gtd.2013.0824
syed taha Ahmed please go through articles attached herewith, i hope it will help you a lot
Conference Paper The Dependence of Gas Turbine Power Output on System Frequen...
Jazakallah khairan
I have such curves from Siemens and GE for several engines. I can't send them to you but you could ask them.
1. When a Gas Turbine is connected to a Grid, grid frequency affects the flow and output but governor or controller maintains the power output at the set value. Small frequency fluctuations occur routinely and speed/power output controller regulates.
2. When GT is already generating its maximum you cannot increase the fuel flow and hence power.
3. As long GT is connected to grid, GT speed is dictated by grid only. GT's speed cannot change,
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