Higher and higher demands of power quality detection are asked approach to the further demand to understanding of power quality. Moreover, harmonics in the grid is detected how fast and synchronous appears especially important. An approach to detect harmonics is presented in this paper. The design is mainly composed of a single ATT7022C chip and a microcontroller. Working principle is introduced firstly. Then the structure of the system is discussed. A software design approach of data acquisition, based on the chip ATT7022C and low cost DSP TMS320F2812 (F2812), is given in this paper. This design is given to verify fast speed, high detection accuracy and poor calculation.
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