The origin for the low power quality at the output of a 132 MW wind farm has been investigated. A resonant circuit formed by the wind farm components is found to be responsible for a high level of the 7th current harmonic. The structure of the investigated wind farm is similar to those of offshore wind farms with AC cable connection. The same resonance problem is expected to occur in offshore installations with long high voltage AC cables. Various compensation strategies are proposed and analyzed.
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