DETECTION AND QUANTIFICATION OF HARMONIC EMISSIONS IN DOUBLY FED INDUCTION GENERATOR

In this paper, Discrete wavelet transform available in Wavelet toolbox, MATLAB/SIMULNIK has been used to analyze harmonics presented in DFIG. The wavelet toolbox is successfully used to calculate the energy levels presented in the harmonics of the voltage and current waveforms generated in the DFIG. A technique to find out the THD independent of FFT is implemented in MATLAB and the THD for all the phases in both the current and voltage waveforms are computed and tabulated in the simulation results. It is observed from the case study that the discrete wavelet transform is an effective tool to detect and quantify the harmonics present in the DFIG. The simulation results in each phase are presented in the simulation results. The results of the proposed approach has been compared with theoretical result and FFT and it is found from the results that the proposed approach provides better results.