Title page for ETD etd-03062007-192213


Type of Document Master's Thesis
Author Jeffers, Robert Fredric
Author's Email Address rjeffers@vt.edu
URN etd-03062007-192213
Title Techniques for Wide-Area State Estimation in Power Systems
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
De La Ree Lopez, Jaime Committee Co-Chair
Thorp, James S. Committee Co-Chair
Centeno, Virgilio A. Committee Member
Keywords
  • Regional Transmission Organization
  • State Estimation
  • Wide-area monitoring
Date of Defense 2006-11-29
Availability unrestricted
Abstract
Because of a move from Independent System Operators (ISOs) to Regional Transmission Operators (RTOs), a need for real-time wide-area system monitoring has arisen. The state estimator (SE) is the tool currently used in power systems for real-time monitoring. Because current SE techniques become operationally expensive on such large systems, it is beneficial to consider alternate methods for wide-area state estimation (WASE). In particular, hierarchal methods for WASE become beneficial for large systems because of their speed of operation and relatively low data volume. This study tests four hierarchal WASE methods - two taken from literature, and two developed by the author – and compares them with the use of an integrated wide-area estimator. Additionally, because of their accurate and readily available measurement capability, the inclusion of phasor measurement unit (PMU) data in the WASE methods is examined. For the purpose of realistically integrating an RTO WASE with current ISOs, the methods are constrained so that they do not require sensitive data, nor do they alter the operation of the ISOs SE in any way. The methods are tested for speed of operation, global and local accuracy, and robustness under bad data and data loss.
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