The Research Of Harmonic Filtering And Its Application In Guixi Smelting Factory

In allusion to solve the harmonics problem of Guixi Smelter's 110KV transformer substation, this paper introduces chief issues about harmonic and the chief techniques of the equipment, and supply the whole design scheme of a new hybrid active power filter with high capacity for harmonic filter and reactive power compensation.This paper first introduces the present condition of harmonic problem, standard of harmonic in power system and development of active power filter.Secondly, this paper analyses the disadvantage of the hybrid active power filter using in high power system. A new hybrid active power filter is proposed and its principle is described in detail.In succession, some harmonic detecting ways is introduced, the development of an instrument for multi-channel harmonic detection and analysis were described including the system structure, hardware and software of the device. Then the technology of multi-channel data gathering was discussed, and some key techniques have been presented including high precision, high speed sampling of the voltage and current, Fast Flourier Transform(FFT), data compression and storage techniques, planar graphic fitting, three dimensional graphic projection, multithreading and the computer graphics techniques.Lastly, the key techniques of a new hybrid active power filter with high capacity for harmonic filter and reactive power compensation were proposed; the controller based on DSP have been discussed. Application results of the hybrid active power filter have confirmed the feasibility of the integrated compensation system.