Overview of State Estimation Technique for Power System Control

Abstract

The state estimator processes the information available and produces the best possible estimate of the true state of the system. .It is a digital processing scheme which provides a real-time data base for many of the central control and dispatch functions in a power system. The real-time data are processed by state estimator, a computer program which calculates voltage magnitudes and relative phase angles of the system buses. While the state estimator gives result similar to those available from conventional power-flow program, the input data and calculation procedure are quite different. Bus injections along with line flow measurements form the measurement vector in the state estimator in order to evaluate the final states of the power system. Test results without and with measurement noises have been presented. Estimator is also capable of identifying the bad data present in the measurement vector.