Author(s)

Roozbeh Emami

Advisor(s)

Ali Abur (1957-)

Contributor(s)

Bahram Shafai, Aleksandar M. Stankovic

Date of Award

2011

Date Accepted

3-2011

Degree Grantor

Northeastern University

Degree Level

Ph.D.

Degree Name

Doctor of Philosophy

Department or Academic Unit

College of Engineering. Department of Electrical and Computer Engineering.

Keywords

Network Monitoring, Phasor Measurement Units, Security Analysis

Disciplines

Electrical and Computer Engineering | Engineering

Abstract

Among various facilitators of the smart grid are the phasor measurement units (PMU) which are rapidly populating substations in today's interconnected transmission systems. This dissertation investigates the use of PMUs for monitoring the state and topology of transmission systems. The first part of the dissertation is concerned about optimal placement of these devices in order to achieve a measurement design that is robust against bad data, loss of measurements as well as network switching. Unlike previously considered PMUs that have unlimited channels, this study considers PMUs which are manufactured for monitoring branches and therefore have limited reach. Placement problem is formulated as an integer programming problem which is implemented and solved using IEEE standard test systems as well as three actual transmission systems.


The second part of the dissertation focuses on the use of PMUs for improving the external network model. The impact of changes in the external system model on internal state estimation and subsequent security analysis is analyzed first. It is shown that this impact can be minimized by strategically managing the real-time data exchange between the neighboring transmission systems. Both conventional as well as PMU measurements are considered in the analysis. Developed strategy identifies the optimal conventional external measurements whose real-time exchange will bound errors in the static security analysis of the internal system within a desired threshold. The dissertation then extends this analysis to formulate the problem of tracking changes in external network topology using the internal network measurements along with PMU measurements from the external system. Given the importance of external topology errors in static security analysis of the internal system, solution of this problem is considered critical in operation of smart grids. Developed solution is tested using simulated scenarios on IEEE 118-bus test system involving both load and topology changes in the external system.

Document Type

Dissertation

Rights Holder

Roozbeh Emami


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