This topic was presented at the PSCAD Conference held October 6-7, 2016 in Houston, Texas.

Overview: A 200 MW DFIG wind farm is experiencing nuisance tripping.  These occur during switching of power factor correction cap banks comprising of 4×12 MVAR connected to the farm’s 34.5 KV collector buses.  Trip signals recorded by WTGs indicate power quality issues.  Harmonic distortion study of the Project did not indicate potential violations.

A more detailed analysis indicated presence of interharmonics.  The pdf file below presents the modeling, analysis and findings of the assessment.  Simulations were conducted using the PSCAD/EMTDC software, commercial product of Manitoba Hydro.