Investigation of the Current Harmonic Parameters of Wind Energy Converters
Current harmonic parameters of six grid connectedwind energy converters (WECs) with a power of 1.5 MW and
1.8 MW were investigated. The evaluation was done according to
the basic guidelines for harmonic limits EN 61000-3-2 and IEC
1000-3-3. Focus was on the definition and explanation of a typical
shape of the standard parameters Total Harmonic Distortion
(THD), Partial Weighted Harmonic Distortion (PWHD) and the
self-defined parameter Total Harmonic Distortion with
consideration of interharmonics (THDz) over the relative power
of the WECs. Caused by the working principle of the power
electronic voltage-source-inverters (VSI) used, the harmonic
parameters show a clearly definable pattern, depending on the
relative power of the WECs. The context between the power
electronic converter operation and the format of the power
quality curves over the relative power is given.
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