Method of suppressing harmonic and interharmonic noises in electric arc furnace current signal detection

• Main Authors: WANG XIN, LIANG GANG, WEI CHUNXIA, ZHANG XUEJIAO, HAN TAO, WANG XIAOYU, CHANG SIYAO, GUAN YING, ZHENG YE, LIU FENG, WANG BINGXIN, REN XIAOJIU, YANG HAILI, WAN LI, DUAN WEIRUN, JIANG LIYUAN, LENG XUE, LIU MENGJIE
• Format: Patent
• Language: Chinese; English
• Published: 20.06.2017
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The present invention relates to a method of suppressing harmonic and interharmonic noises in electric arc furnace current signal detection. The method includes the following steps that: (1) the time-frequency distribution of electric arc furnace current signals is obtained through using frequency slice wavelet transform; (2) on the basis of the differences of the time-frequency distribution of noise signals and the time-frequency distribution of harmonic and interharmonic signals, time-frequency regions are selected so as to be subjected to refining analysis, so that a time-frequency refined distributed map can be obtained; and (3) the harmonic and interharmonic signals are extracted through regional reconstruction, so that a noise interference-suppressed electric arc furnace current signal map can be obtained. According to the method of the invention, a selection mechanism is established for a frequency slicing function; the electric arc furnace current data are analyzed; the time-frequency distribution of