A MATLAB®-based Postprocessor for Multi-Blade Coordinate Transformation of Wind Turbine State-Space Models
by Gunjit Bir
National Wind Technology Center
MBC is a set of MatLab scripts that performs Multi-blade coordinate transformation (MBC) on wind turbine system model. The dynamics of wind turbine rotor blades are conventionally expressed in rotating frames attached to the individual blades. The tower-nacelle subsystem sees the combined effect of all rotor blades, not the individual blades. This is because the rotor responds as a whole to excitations such as aerodynamic gusts, control inputs, and tower-nacelle motion—all of which occur in a nonrotating frame. MBC helps integrate the dynamics of individual blades and express them in a fixed (nonrotating) frame.
MBC is mandatory to controls and stability analyses—erroneous predictions can result otherwise. A novel feature of this MBC code is that it can handle variable-speed operation and turbines with dissimilar blades. Depending on the analysis objective, a user may generate system models either in the first-order (state-space) form or the second-order (physical-domain) form. MBC3 can handle both types of system models. Key advantages of MBC are: capturing cumulative dynamics of the rotor blades and its interaction with the tower-nacelle subsystem, well-conditioning of system matrices by eliminating non-essential periodicity, and filtering operation.
You may download the following files from our server:
This is a list of changes made to the code. Look at this text file to see if we've made worthwhile changes since you received your previous version of MBC.
This is the MBC User's Guide. Please refer to it when trying to understand how the program works.
This is the self-extracting archive of the latest alpha version of MBC. Simply execute it in an appropriate directory to extract the files. It contains a ReadMe file, alpha change log, the source code, sample data files, a certification script to test your installation, and a compiled version of the code. The scripts are compatible with MATLAB® 7.5.0 (R2007b).
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