STATE ESTIMATION OF POWER SYSTEMS

Abstract

Utilities in India are now largely equipped with Computer-ized Load Despatch Centres. These Load Despatch Centres are to function as Supervisory Control and Data Acquisition Centres (ScAJ*) , which collect status data of breakers and switches, and analog data of active and reactive power flow, injection and bus voltages. These data when combined with supervisory control sys-tem allows operator to control circuit breakers and transformer taps and disconnect switches remotely. Presently in our country, the telemetered data is used by the operators to send the switch-ing commands and filtering of data errors is not yet carni d out. This motivated the author, who is an utility engineer to work on State Estimation so as to have a feeling of the problem and build confidence to incorporate it as an integeral part of the SCADA for real time application. The computational speed and efficienc/ y i the main crite-ria in implementing State Estimation for realtime security, mon-itoring and assessment. Therefore, the latest reported Hachtel's augmented Matrix method has been compared and implemented with _Normal 5quation method, the basic method. Experience of imple-menting both the methods in their Fast Decoupled version using single precision was not favourable. Hachtel's Augmented Matrix method has been developed using full Jacobian in single precision. MI The growing size of system has diverted the efforts to the Hierarchical State estimation for gaining computational speed and reliability. The State Estimation by Network Ilecomposition has been presented. The thesis concludes with findings during this work and areas identified as future scope of work.