Using the internet in networking of synchronized phasor measurement units

This paper describes the design and implementation of an experimental phasor measurement unit (PMU) network. The PMUs synchronically measures current and voltage phasors at key system buses in real time. They are synchronised using time transmission from the Global Positioning System (GPS) satellites. The measurements are transmitted either via dedicated links between specified sites, or over a switched link that is established for the purpose of the communication. At the communication and functional level, we implemented TCP/IP protocols as a flexible way of accessing and controlling the PMUs. Use of the Internet technology and client-server concept gives the ability to add any number of PMUs to the network and give access to any number of users at any location.