The Exploration Of Harmonic Monitoring Apparatus For Power System Based On DSP

In order to monitor power network, this paper presents a new design of a harmonic test apparatus for power system based on DSP. The apparatus on the spot performs mathematics and numerical processing including FFT and so on to voltage and current sign and Data can be stored, query and display the menu of operation on LCD. Monitor apparatus can measure frequency of three phase voltage and current, power factor and harmonic within twenty -five, degree and harmonic distortion total. The paper are laid on the following:(1) Master plan and function of circuit, (2) Hardware design including circuit and principle of A/D conversion, phase lock, liquid crystal display and keystroke and so on, (3) Design of system software including digital filtering, FFT and menu of LCD (4) system test.