Abstract
There are various kinds of damage caused by large amount of harmonic in power grid. The research object of this paper is the harmonic in power grid. A simple and practical harmonic detection program is studied. And the harmonic analysis module is completed. First the principle of harmonic generation is analyzed. And then, the signals of the voltage and current in power grid are collecting. At last, the hardware and software of the module are designed. The signals are analyzed and calculated by the module. The harmonic content is put out. The test proved that the module has the advantages of high precision, good reliability and low cost. It can be used on a variety of equipment.
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