Wavelet Denoise Simulation on DC Arc Heating Furnace

Abstract:

90 MW DC arc furnace uses the current 2transformer rectifier bridge thyristor controlled by adjusting the angle trigger to compose 24 pulse wave rectifier circuit.The 24 pulse wave rectifier circuit generates harmonics mainly about 11,13,23 and 25 times harmonic,these highfrequency harmonics do great harm to arc furnace on the effectiveness of the current regulation.A variety of wavelet is employed in thresholding 90 MW DC arc furnace power system harmonic signal noise,and the optimal choice from the noise threshold optimize the signal processing correspondingly.The simulation results show that 90 MW DC arc furnace system harmonic signal wavelet denoises the optimal threshold for sqrt (2log (length (X))) threshold,and the harmonic components reduce obviously,as a result,the operation of the 90 MW DC arc furnace is ensured.