Title 



Robustification of the least absolute value estimator by means of projection statistics
 
Author 



 
Abstract 



This paper describes a fast and robust method for identifying the leverage points of a linearized power system state estimation model. These are measurements whose projections on the space spanned by the row vectors of the weighted Jacobian matrix, the socalled factor space, do not follow the pattern of the bulk of the point cloud. In other words, their projections are outliers in the factor space. The proposed method is implemented through a new version of the projection algorithm that accounts for the sparsity of the Jacobian matrix. It assigns to each data point a projection statistic defined as the maximum of the standardized projections of the point cloud on some directions passing through the origin. By comparing these projection statistics to cutoff values, we can identify the outliers in the factor space and thereby pinpoint the leverage points. The projection statistics are also used to derive weights for robustifying the weighted least absolute value estimator. The computational efficiency and the robustness of the method are demonstrated on the IEEE14 bus and 118bus systems.   
Language 



English
 
Source (journal) 



IEEE transactions on power systems / Institute of Electrical and Electronics Engineers [New York, N.Y.]  New York, N.Y.  
Publication 



Piscataway : IEEE, 1996
 
ISSN 



08858950
 
Volume/pages 



11:1(1996), p. 216223
 
ISI 



A1996TX79400083
 
Full text (Publishers DOI) 


  
