Application of parameter estimation methods to the assessment of DFIG;s currents

Proliferation of nonlinear loads and development of renewable energy resources introduces new challenges in power quality monitoring due to the increased level of harmonic distortion of voltage and current signals. In this paper, the quality of harmonic distortion of currents recorded on a laboratory double fed induction generator drive is investigated. An efficient nonlinear estimation method is applied to evaluate the effects of interharmonic distortion in the estimation process. The results obtained are compared with those provided by the application of the fast Fourier technique (FFT).