search

OpenFAST / openfast

Main repository for the NREL-supported OpenFAST whole-turbine and FAST.Farm wind farm simulation codes.
http://openfast.readthedocs.io
Apache License 2.0
690 stars 457 forks source link

The generator speed is negative #2176

Open 1yihangyang opened 6 months ago

1yihangyang commented 6 months ago

When I use OpenFast and Simulink co-simulation, why my model is running out of a generator with a negative speed。 The model is as follows： 1 Below is the torque control model： 2 The following table describes the running text and parameter settings： 3

jjonkman commented 6 months ago

Dear @1yihangyang,

The GenSpeed output of OpenFAST is expressed relative to the high-speed shaft in rpm; I'm not sure why are are again multiplying by GBRatio (97). You also seem to be mixing units, e.g., converting GenSpeed to rad/s, but then keeping SIG_SySp (1173.7 in rpm) in your pitch controller.

I'm also not sure where you are getting the Simple Induction Generator (SIG) properties for the NREL 5-MW baseline wind turbine (considering this turbine is not typically modeled with an induction generator), e.g., SIG_RtTq = 1367.9 N*m seems far too small.

Best regards,