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Power systems state estimation: the geometrical view applied to the processing of measurements, parameters and topological errors

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Breno Elias Bretas de Carvalho
Total Authors: 1
Document type: Doctoral Thesis
Press: São Carlos.
Institution: Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD)
Defense date:
Examining board members:
Newton Geraldo Bretas; Luís Fernando Costa Alberto; Carlos Dias Maciel; André Christóvão Pio Martins; Saulo Augusto Ribeiro Piereti
Advisor: Newton Geraldo Bretas

This work was proposed with the objective to implement a computational tool to estimate the states (nodal complex voltages) of a power system and apply alternative methods for the processing of topological errors, parameter errors and/or gross errors in measurements, based on the geometric interpretation of the errors and the innovation concept of measurements. The method used to solve the state estimation problem is the weighted least squares. Through geometric interpretation, it has been demonstrated mathematically that the measurement error is composed by a detectable component and a non-detectable, however, the methodologies heretofore used for error processing consider only the detectable component of the error and, consequently, can fail. In an attempt to overcome this limitation and based on the concepts mentioned previously, an alternative approach to process such errors was studied and implemented based on the analysis of the components of the measurements errors. Firstly, it is tested if the set of measurements has errors using, for that, the value of the composed measurement error in its normalized way. Next, it diers if either an error has occurred, or if more than one type of error occurred. The correction to be made in the line parameter or the measurement with gross error is the correspondent composed normalized error. The proposed approach in this paper requires only a set of measures, and at the same instant. To validate the software, several simulations were performed in the IEEE 14-bus and 57-bus systems. (AU)

FAPESP's process: 13/07976-3 - Power Systems State Estimation: A Geometrical View in the Processing of Topological Errors
Grantee:Breno Elias Bretas de Carvalho
Support Opportunities: Scholarships in Brazil - Doctorate