Harmonics analysis of the direct current power system based on multi-frequency range of wavelet

At present, our country electrical power system overtone analysis is based on the time domain scope Fourier transformation, this method has the frequency range to localize completely, but does not have the topicality in the time domain. The authors synthesized the domestic and foreign research results, proposed the use of four frequency bands wavelets method in which its transformation takes the mathematical model, and the overtone analysis is carried out for the direct current transmission system. The method uses mature overtone generatrix impedance matrix model which Austrian J Wekileh proposed, based on MATLAB software analysis to compute voltage, electric current distortion factors. In this foundation, the authors further proposed to use existing active filters for the implementation of wavelet compensation by the computer control of the filter output signals through the development of corresponding connection software in order to complete the harmonic suppression.