Degree Type


Date of Award


Degree Name

Master of Science


Electrical and Computer Engineering


Electrical Engineering

First Advisor

Ian Dobson


Synchrophasors are especially useful for wide area monitoring, state estimation, and various

other applications. Hence, electric utilities are installing these synchrophasors in their areas. Power

transfer through these areas stresses the system whenever there are outages inside the area. When

state estimator fails to converge, a fast indication of the amount of stress inside the area is necessary

whenever there are multiple outages in the area. We use the synchrophasor angle measurements at

the border buses of an area to calculate area angle which indicates the stress inside the area. The

operator can use this indication to take necessary actions. The area angle is a scalar measure of

power system area stress that responds to line outages within the area and is a weighted combination

of synchrophasor measurements of voltage angles around the border of the area. The area angle

has previously been tested in a transfer path areas on a reduced model. In this thesis, we further

explore and test this concept on a detailed western interconnection model. Working on a detailed

model has computational challenges. We explain techniques to achieve the computational efficiency.

We also design new power system areas to extend the fast synchrophasor monitoring of multiple

overloads with area angles. The new areas have loads in the middle of the area supplied by power

flows into the area along its outer border. We examine setting actionable thresholds for curtailing

area transfers when there are multiple outages and the robustness of the method to the pattern of



Copyright Owner

Vikram Kumar Reddy Chiluka



File Format


File Size

43 pages