Different Pitch rate in and outside FAST SFunction in Simulink

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Yunpeng.Song
Posts: 4
Joined: Wed Apr 15, 2020 5:20 am
Organization: The University of Tokyo
Location: Japan - Tokyo

Different Pitch rate in and outside FAST SFunction in Simulink

Postby Yunpeng.Song » Thu Aug 13, 2020 12:22 am

Dear Dr. Jonkman,

I meet some problem when I'm trying to modling a modified pitch control loop in Simulink.
In my pitch control loop, the pitch rate been limited between -8deg/s to +8deg/s, however the output signal show very large fluctuation and the pitch rate in output signal is largly over my limitation. (you can find the time series of pitch angle & pitch rate in attachment.)

Annotation 2020-08-13 153900.jpg
Pitch angle & pitch rate signal
Annotation 2020-08-13 153900.jpg (310.92 KiB) Viewed 629 times


May I know why my opration signal been changed in FAST, is there a mechanism in the FAST to modify the received control signals?

Thanks

Best Regards,
SONG

Jason.Jonkman
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Re: Different Pitch rate in and outside FAST SFunction in Simulink

Postby Jason.Jonkman » Thu Aug 13, 2020 6:46 am

Dear Yunpeng,

Similar questions have been asked and answered before, e.g.:
viewtopic.php?f=30&t=1528&p=12274
viewtopic.php?f=4&t=1985&p=10496
viewtopic.php?f=30&t=1720&p=8155
viewtopic.php?f=4&t=2515&p=14870

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Yunpeng.Song
Posts: 4
Joined: Wed Apr 15, 2020 5:20 am
Organization: The University of Tokyo
Location: Japan - Tokyo

Re: Different Pitch rate in and outside FAST SFunction in Simulink

Postby Yunpeng.Song » Sun Aug 16, 2020 3:16 am

Jason.Jonkman wrote:Dear Yunpeng,

Similar questions have been asked and answered before, e.g.:
viewtopic.php?f=30&t=1528&p=12274
viewtopic.php?f=4&t=1985&p=10496
viewtopic.php?f=30&t=1720&p=8155
viewtopic.php?f=4&t=2515&p=14870

Best regards,


Thank for your kind reply. These topics realy helped me a lot.

Best regards,
SONG


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