Follow us at  twitter
Not so Harmonious?
todeschiniThis article describes an aspect of wind turbine operation related to  control instability  which may result in excessive harmonic currents injection from wind turbines, well above the typical level. This phenomenon and has been reported for a number of wind plants. The excessive harmonic currents were the result of the interactions between harmonic currents on the power systems and turbine controls under particular operating conditions. These conditions can be summarised as follows: (1) the presence of background harmonics and resonance conditions in the power system and (2) undampened turbine control response at frequencies coinciding with one or more of the harmonic currents in the power system. Both these conditions will be explained in this article, and the resulting control interaction will be clarified. Harmonic interaction is a known problem among power electronics engineers and control designers, and mitigating solutions are available.
By Grazia Todeschini, EnerNex, USA

Want to read full articles? Sign up free of charge and login and read the full text of published articles on our website.

Joomla SEF URLs by Artio