FreeLists / si-list / [SI-LIST] Passivity Enforcement Matlab Code

[Raymond Anderson <Raymond.Anderson@xxxxxxx>]

Any of the list members who are interested in passivity enforcement as 
it pertains to modeling may be interested in the Matlab code just 
released by Dr. Bjorn Gustavsen of SINTEF Energy Research in Trondheim, 
Norway.
He writes:

> Hi Raymond,
>  
> You may want to announce on your list-server that a package for
> passivity enforcement (QPpassive.zip) has now been added to the site
> http://www.energy.sintef.no/produkt/VECTFIT/home.asp
>  
> Best regards,
> Bjorn


This code utilizes quadratic programming techniques.

 From Bjorn's web page:
------------------------------------------------------------------------

This package contains a post-processing procedure for enforcing 
passivity of a model given on pole-residue form. This is done by 
introducing the passivity criterion as a constraint equation in the 
least squares problem. The routine requires the user to provide 
frequency samples for the least squares problem and the passivity 
constraint. A large number of options is available. 

Download: QPpassive.zip*

* <http://www.energy.sintef.no/produkt/VECTFIT/QPpassive.zip>

*File*

        

*Purpose*

QPpassive.pdf

        

User manual

passivity.pdf

        

Document describing the theory (IEEE paper)

QPpassive.m

        

Passivity enforcement routine

rot.m

        

Utility routine, rotates eigenvectors to minimize their imaginary part

interchange.m

        

Utility routine, interchanges eigenpairs to obtain eigenvalues as smooth 
functions of frequency

 

        

 

ex1.m, ex2.m, ex3a.m, ex3b.m, ex4a.m, ex4b.m

        

Example cases described in QPpassive.pdf

ex1.mat, ex2.mat, ex3.mat, ex4.mat

        

Workspaces containing variables for examples (ex1.m,...)

 

        

 

 

Note: QPpassive.m uses the routine quadprog.m of the Matlab Optimization 
Toolbox.

----------------------------------------------------------------------------------------------



-Ray Anderson

Sun Microsystems Inc.




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