Power quality mainly includes the quality of voltage, frequency, and waveform.Power quality monitoringdeviceIt mainly measures voltage deviation, voltage fluctuation and flicker, frequency deviation, harmonics and voltage asymmetry, imbalance, etc. Monitoring the reliability of power supply is also one of the important tasks. Power supply reliability refers to the ability of a power supply system to continuously supply electricity, which is an important indicator for assessing the quality of power supply system energy. It reflects the degree to which the power industry meets the national economic energy demand and has become one of the standards for measuring a country's economic development level.

Power supply reliability can be measured by a series of indicators such as power supply reliability rate, average user outage time, average user outage frequency, and equivalent system outage hours; The reliability rate of power supply in general urban areas in China currently exceeds 99.9%, and the average annual power outage time for users does not exceed 8.76 hours; The central area of important cities has reached over 99.99%, and the average annual power outage time of users does not exceed 53 minutes.

The goals of conducting research on smart grids include: achieving stable operation and reducing the risk of large-scale power outages; Effectively utilizing distributed power sources; Improve the utilization rate of power grid assets; Improve user electricity efficiency, reliability, and power quality. The introduction of smart grids provides users with the opportunity to choose power supply companies, power supply quality, and power supply prices.

The two sides include detection terminals, communication networks, and monitoring centers. With the continuous development of the power grid, the power grid is becoming larger and more points need to be detected. The power quality monitoring system needs to be able to perform multi-point monitoring, and at the same time, it has functions such as storing and analyzing power quality data, predicting accidents, identifying disturbance types, locating power quality disturbance sources, analyzing the causes of voltage sags, comprehensively evaluating power quality, and publishing power quality information for judgment and decision-making.

At the same time, after achieving online and real-time monitoring, power quality monitoring is moving towards networking, informatization, and standardization. Networking, informatization, standardization, and intelligence have become an inevitable trend in the development of power quality monitoring systems, which can provide necessary basic data for the implementation of other functions of the smart grid.