The study and design of inter-harmonic detection device based on quasi-synchronous technique in power system
Zheng Fan1 Xianfeng Zheng2
1Faculty of Electrical EngineeringHenan Mechanical and Electrical Engineering College,Xinxiang, Henan, China
2Faculty of Automatic Control Engineering Henan Mechanical and Electrical Engineering College,Xinxiang, Henan, China
On the basis ofanalyzing the characteristics of harmonic signals, the inter-harmonic detection algorithm of quasi-synchronous sampling is introduced in this paper. This algorithm pre-processes the original sampled signal and separates all the harmonics and inter-harmonics of the reconstructed signal with designed comb FIR filters, to restrain the mutual interference between them, and finally achieve accurate measurement of harmonic and inter-harmonic inpower system. At last, the validity of this algorithm is verified with harmonic and inter-harmonic signal generated from standard signal source.