Investigation of the Current Harmonic Parameters of Wind Energy Converters

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Current harmonic parameters of six grid connected
wind 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
$ S( V9 {$ @' n7 nconsideration of interharmonics (THDz) over the relative power
; ^( y; j( }) I8 `! A; Eof the WECs. Caused by the working principle of the power
electronic voltage-source-inverters (VSI) used, the harmonic
! j3 |. S+ R- i; Qparameters show a clearly definable pattern, depending on the
relative power of the WECs. The context between the power
! e% T5 A% o3 W$ ?; E9 _- v* q- gelectronic converter operation and the format of the power
* L! R: b  z2 \# T9 H  ?' ?# _quality curves over the relative power is given.