广元电力系统谐波检测方案研究-电气工程专业论文.docxVIP

重庆大学硕士学位论文 重庆大学硕士学位论文 摘要 ABSTRACT This thesis is about studying the methods that application in the electric power supply system to detect the electric power harmonic in domestic and abroad．In this thesis，summarized the basic theories of Fourier transformation and the fast Fourier transformation that are generally adopted to detect and analyze the electric power harmonic in the electric power supply system．At the same time，summarized the even sample principle，the phenomenon of frequency mix，the window functions and the frequency leaking as so on，those closely—related to sample from figure signal． Furthermore，we analyzed the investigating reports which were concerned the present situation of the electric power harmonic pollution in the Guangyuan district’s electric power supply system，and presented the necessity and important of detecting and eliminating the electric power harmonic in the electric power supply system．The thesis’S main contents including： Summarized the main reasons why the electric power supply system produce the electric power harmonic，and the electric power harmonic may bring what harms to electric power supply system’S equipments and the other appliances which connected in electric power supply system the other electronic appliances beside the electric power supply system．Analyzed and explained the necessity and important that should detect and eliminate the electric power harmonic in the electric power supply system； Investigated and analyzed the no—line loads in Guangyuan district’S electric power supply system．Analyzed and studied the situations of this electric power supply system and its examination reports that were done by Sichuan Province Electric Power Company in 1 99 1，2000．Summarized no·line loads and the present situations of the electric power harmonic pollution in the Guangyxaan district’s electric power supply system； Explained the theories of F