Dear all,
I have been working on the blade-pitch and generator-torque controller lately. Initially, the generator torque in region 3 was determined so that the generator power was constant [1]. Then, further studies on the floating system suggested to use a constant torque in region 3, for stability reasons [2].
My question is: shouldn’t the equations for the blade-pitch controller change according to the new generator-torque law in region 3?
For example, in [1] at page 21, formula (7.6), it is said that “because the generator-torque controller maintains constant generator power in Region 3, the generator torque in Region 3 is inversely proportional to the generator speed”. However, with the new characteristic in region 3 this does not hold anymore.
Could you give me any help about this matter?
[1] Jonkman et al., “Definition of a 5-MW Reference Wind Turbine for Offshore System Development”, 2009
[2] Jonkman et al., “Definition of the Floating System for Phase IV of OC3”, 2010
Best regards
