The continuous development of nonlinear loads raises harmonic pollution to a considerable extent on power systems and requires new tools to analyze these disturbances. For simplified studies, a statistical approach of harmonic propagation conditions in meshed systems is an efficient alternative to the tedious implementation of a simulation process. Under these circumstances, a new method has been designed to give a probabilistic estimate of harmonic disturbance levels. It consists of defining statistical models for the impedances of the system. This method has been validated by a specific set of measurements on the French 400 kV system.
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