Harmonic emission study of individual wind turbines and a wind park

Abstract

The paper analyses the measured emission from four individual modern turbines of about 2MW size equipped with power electronics. The four turbines show different long term spectra and their spectra also show different variations with time. The harmonic emission from individual turbines consists of harmonic and interharmonic spectra. This emission was shown to be low, with the exception of certain non-characteristic frequency components. The measured emission from individual wind turbines has been compared with emission limits. When IEEE Std 519 is applied, for two of the turbines the limits are exceeded for higher odd harmonics. At the same time, these turbines comply with the national French emission limits. Next, a study of the primary harmonic emission of a wind park as a whole was performed. It is concluded that the emission from a park can be higher as well as lower than the emission that would be obtained by adding the harmonic magnitudes of the individual turbine emissions.