Abstract
The security control of an electric power system requires a knowledge in real-time of the system state expressed as the vector of complex voltages at all buses of the network. The most practical way known of obtaining the system state is through State Estimation. Although introduced to the power industry about 10 years ago, State Estimation as a part of power system control centers had a very slow start until in recent years when due to the availability of cost-effective computers and the maturity of algorithms, State Estimation is now becoming more widely applied. The basic method of weighted least squares is the most widely used approach inspite of early attempts at other variations. This paper serves as an introduction to a more detailed inquiry into the subject by the interested reader.
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