To improve the power quality of the micro-network, it is first necessary to test the power quality of the power grid. In terms of technology for measuring the parameters of the power quality index, it has evolved from the original analog technology to the current digital technology. Divided into the following three types: method method of simulation in the time domain: ② analysis method in the frequency domain: ③ transforms the analysis method in the domain. In the research and development of power quality detection devices, many innovative achievements have been achieved at home and abroad. For example, the power quality monitoring devices introduced by FLUKE in the United States and the Electricity Measurement Company in the Canada, according to the different power quality detection methods,