A PMU Scheduling Scheme for Transmission of Synchrophasor Data in Electric Power Systems

摘要

With the proposition to install a large number of phasor measurement units(PMUs) in the future power grid, it is essential to provide robustcommunications infrastructure for phasor data across the network. We makeprogress in this direction by devising a simple time division multiplexingscheme for transmitting phasor data from the PMUs to a central server: Time isdivided into frames and the PMUs take turns to transmit to the control centerwithin the time frame. The main contribution of this work is a schedulingpolicy based on which PMU transmissions are ordered during a time frame. The scheduling scheme is independent of the approach taken to solve the PMUplacement problem, and unlike strategies devised for conventionalcommunications, it is intended for the power network since it is fully governedby the measure of electrical connectedness between buses in the grid. Toquantify the performance of the scheduling scheme, we couple it with a faultdetection algorithm used to detect changes in the susceptance parameters in thegrid. Results demonstrate that scheduling the PMU transmissions leads to animproved performance of the fault detection scheme compared to PMUstransmitting at random.