Nowadays the electrical network companies put high effort in utilizing their distibution capacity into the full extent. For this of major importance is a good knowledge of load currents and other technical limiting quantities. The final objective is to know the margin between ultimate technical limits and the actual distribution system state. For this, different state estimation techniques have been developed. State estimation is a well known function in transmission network analysis. However, in distibution systems the idea is relatively new and practical applications are not that common. One reason for this is that, contrary to the circumstances in transmission systems, in distribution networks there are no excessive measurements, but one has to rely on both measurements and statistical load models.
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