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Stall regulated NREL 5MW and cut-in-speed adjustment
Hi there,
I tried to calculate the power output of the NREL 5MW turbine with stall regulation using the Turbine BEM Simulation. I then compared it to the power output of the pitching NREL 5MW. The output is similar to the point where the pitched turbine reaches its rated power. From there on, the stall regulated turbine just keeps raising its power output (because theres no option to set a rated power , I guess).
I would expect the pitching turbine to have a higher power output at all stages, due to the skill of adjusting the blades to the angle of attack. Does anyone know how to fix this?
The turbines do also have the same cut-in-speed. Is there a way to adjust the cut-in-speed of the wind turbine when its stall regulated? It should get higher due to non-optimal aerodynamic conditions at low wind speeds.
thanks a lot
Lutz
Hello Lutz,
the pitch regulation mechanism of a wind turbine is designed to control (i.e., reduce) power output when wind speeds exceed the rated value.
Consequently, a wind turbine without pitch control will generate more power at higher wind speeds, as its blades are not actively adjusted to limit output.
In the QBlade GUI, you can freely define the cut-in and cut-out wind speeds, as well as specify the range of wind speeds for your simulation.
BR,
David
is there a way to add a torque control realized by the generator to the stall regulated wind turbine? as a way to optimize and/or limit energy output until the wind turbine reaches its stall?
Define means: the programm itself is not calculating the new cut in speed itself based on the changed parameters in turbine or blade design?
Hi Leon,
in the steady-state BEM simulations, no explicit control mechanisms are implemented.
If your goal is to limit the generated power of a stall-controlled turbine, you have a couple of options:
- Adjust the aerodynamic blade design to ensure that the blade stalls at the desired Tip Speed Ratio (TSR). This involves modifying the airfoil characteristics or twist distribution to achieve the intended stall behavior.
- Manually define the prescribed rotational speed for each wind speed to simulate a torque control scenario. This allows you to impose a specific operational strategy, effectively mimicking the behavior of a controlled system.
BR,
David
