Design and realization of a new power quality monitoring device

To improve accuracy and speed of a power quality monitoring device, the monitoring device with field-programmable gate array (FPGA) as the core of processing and controlling is designed. The hardware of the device includes signal acquisition unit, communication unit, power supply unit, etc; the software includes an NIOS II embedded core, optimizing the flow of data processed parallel, and Phase-locked frequency multiplication module and FFT harmonic analysis module implementing the synchronous sampling and analysis of power quality data are built. Test results show that the device has advantages of fast response, high accuracy and satisfactory real-time performance, and conforms to the national standards of power quality monitoring.