Monitoring of single and multiple line outages with synchrophasors in areas of the power system

Abstract

When power grids are heavily stressed with a bulk power transfer, it is useful to have a fast indication of the increased stress when multiple line outages occur. Reducing the bulk power transfer when the outages are severe could forestall further cascading of the outages. Phasor measurement units (PMUs) are vital elements for monitoring and control of these heavily stressed power system. This work presents a new approach to implement and utilize PMU information to monitor operational transfer capability and limits based on voltage phasor angles with respect to thermal limits of transmission lines. This work demonstrates an algorithm to obtain thresholds based on the angle and then quickly deploy PMU data to monitor stress changes due to single and multiple outages in real time to send fast notification of emergency situations. Area angle uses the topology and the synchronized measurements of angles across an area of power system to measure stress caused by outages within the area. The proposed

Real-Time Area Angle Monitoring Using Synchrophasors: A Practical Framework and Utility Deployment

“…[k] mod is the corresponding area angle with P k mod through the area. The results from section 4.4 in [27] show that θ…”

“…Moreover, there is a good approximation when the parallel paths outside the area have high impedance. In this case, when a non-islanding contingency k occurs, P k mod ≈ P mod [27], [28]. So we have:…”

Real-Time Monitoring of Area Angles with Synchrophasor Measurements

“…[k] mod is the corresponding area angle with P k mod through the area. The results from section 4.4 in [18] show that θ…”

“…Moreover, there is a good approximation when the parallel paths outside the area have high impedance. In this case, when a non-islanding contingency k occurs, P k mod ≈ P mod [18], [19]. So we have:…”