A new power quality detection device based on embedded technique

A new kind of monitoring device on power quality based on digital signal processing (DSP) chip and advanced RISC machine (ARM) microprogrammed control unit (MCU) is introduced in this thesis. And its power quality detection arithmetic and its hardware realization and software realization are expatiated on. The device use a kind of reformative FFT to measure harmonic frequency difference, with a digital filter method to survey voltage fluctuation and flicker, in a wavelet transform to detect transient power quality disturbance, on an embedded Linux operation system to develop management software, by DSP chip to implement power quality calculations and through ARM MCU to perform data management, so that the device can implement real-time, comprehensive and high-precision monitoring and management for all power quality parameters. Thus, the device not only structures a self-governed power quality monitoring system, but also acts as front placed part or local area network of wide area power quality monitoring system.