I have been using FAST in order to model a 1.5 MW wind turbine. I am interested in comparing performance of a medium speed and a high speed wind turbine. For this I am using one of the standard tests cases provided with the archive.
I have two questions.
I want to understand the effect of grid faults and its influence on the dynamics of the drivetrain. I am using the high speed shaft torque variations as a measure of this influence. Is there a way of doing this in FAST?
I am currently setting generator time off to a certain value to simulate the turbine going offline and comparing performance. However, this is not providing me results the way I am expecting them to look. Ideally I would like to spike the value of the gen torque and set it back to baseline value but I can only “play” with TimGenOn or TimGenOf. I have been modifying the drivetrain properties to reflect changes from a HS to MS drive train concept and outputting “HSShftTq” and “GenTq”.
I have a Matlab script for a torsional model of a drivetrain with almost non-existent aero and generator models (see picture below). I have set some aero torque and generator torque to simulate its effects. I induce a grid fault by creating a disturbance on the torque input on the grid side and the HSS torque variations for a medium and high speed gearbox is shown below. This is what I would to simulate in FAST.
At some stage I want to incorporate a more comprehensive model for generator and probably convertor dynamics. I am specifically interested in modelling permanent magnet generators. Has anyone tried to model permanent magnet generators in FAST? I have seen some work in literature on using standard models available in PSCAD or some other software. Is there a way to link it to FAST for simulating turbines along with models of fully rated converters?
Any suggestions would be of immense help.
Michigan State University