Research on Power Quality Monitoring Method of Distribution Network based on Intelligent Fusion Terminal*

Abstract

At present, distributed generation, microgrid, energy storage and electric vehicles are widely connected to the power grid, which makes the power grid show obvious imbalance in space and time. The power quality problem of distribution network is more and more prominent. It is necessary to realize the large-scale power quality monitoring of distribution network. In order to solve the lack of large-scale power quality monitoring of distribution network economically, this paper studies a power quality monitoring method of distribution network based on Intelligent Fusion terminal under the framework of Internet of things. The terminal and method realize the monitoring of voltage and current harmonics, three-phase imbalance and other power quality indexes, and meet the economic requirements of power quality monitoring of distribution network. The test results show that the method achieves 2–50th harmonic monitoring, the accuracy error is less than 2%, and the basic monitoring time window meets the requirements of gapless and non-overlapping 10 cycles; The accuracy error of three-phase unbalance monitoring is less than 0.065%. The test results verify the accuracy of the monitoring method, which can be applied to power quality monitoring of distribution network.