By Topic

Evaluation of modal transformation matrices for overhead transmission lines and underground cables by optimization method

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
T. T. Nguyen ; Dept. of Electr. & Electron. Eng., Western Australia Univ., Crawley, WA, Australia ; H. Y. Chan

The paper develops a numerical procedure based on constrained optimization for evaluating the modal transformation matrices of overhead transmission lines and underground cables. In the method, the eigenvalue-eigenvector equation is transformed into an objective function which is then minimized for finding eigenvalues and eigenvectors. The method developed avoids completely the problem of eigenvalue switching which causes the discontinuities of eigenvectors encountered in the QR-method. Initial values for starting the optimization at each frequency are the eigenvalues and eigenvectors evaluated at the preceding frequency. This technique leads to the set of smooth eigenvectors that define the modal transformation matrices. The form of the objective function derived in the paper for minimization together with the sequential quadratic programming technique guarantees that convergence to valid eigenvalues and eigenvectors is achieved. Using the method, transformation matrices for a wide range of frequency for representative double-circuit line and underground cable are evaluated

Published in:

IEEE Transactions on Power Delivery  (Volume:17 ,  Issue: 1 )