Three channel distributed power quality detection system
LIU Ying-jie，XV Fang，PAN Guo-bing
（The MOE Key Laboratory of Special Purpose Equipment and Advanced Machining Technology，Zhejiang University of Technology，Hangzhou 310014，China）
Abstract：In order to solve the problem of detecting power quality in real-time and the complexity of networking in the system of onlinedistributed micro-grid，after the detailed analysis of the hardware and soft structure of the power quality detection system，a three channeldistributed power quality detection device was designed. Micro-gird system nodes' three-phase voltages，three-phase currents，systemfrequency，power factor，active power，reactive power，harmonies of power system，three-phase imbalance and other basic power quality
parameters can be monitored in real time，and the data can be uploaded to a host computer to display and storage through serialcommunication. Finally，the results between this device and the one with FLUKE5000 were compared. The test results indicate that thesystem can meet the requirement of designation for the power quality detection system，which can verify the effectiveness and practicalityof the device.
Key words：power quality detection；micro-grid；three channel；online distributed