On line multi-location power system harmonics measurement via the internet

Traditional methods to measure power system harmonics employ either the power harmonic analyser or the software package such as Matlab. They, however, usually have limited capability in the Internet connection and/or human graphical interface even for multi-point measurement. In this paper, a PC-based virtual instrument (VI) to implement a remote multi-point power system harmonics analysis and monitoring using LabVIEW is proposed. The nearby PC (Server) can collect real-time waveform data from multi-locations and transmit it to remote PCs (Clients) for on line harmonic analysis and monitoring via the Internet. The history of Total Harmonic Distortion (THD) in the waveform signals can be also recorded and tracked in the database. Experimental results have testified its good performance and remote Web-based capability.