Committee Chair

Eltom, Ahmed H.

Committee Member

Karrar, Abdelrahman A.; Kobet, Gary L.

Department

Dept. of Electrical Engineering

College

College of Engineering and Computer Science

Publisher

University of Tennessee at Chattanooga

Place of Publication

Chattanooga (Tenn.)

Abstract

During the past decades, voltage instability was the reason behind several major blackouts worldwide. Continuous assessment of the system voltage stability is vital to ensure a secured operation of the system. Several voltage stability indicators have been proposed and used in an attempt to quantify proximity to voltage collapse. Some of these are computationally expensive, and others are reported not to perform as expected under all conditions. In this work a new voltage stability indicator named the P-index is proposed. This index is based on normalized voltage and power sensitivities and as such, it provides an absolute measure of the system stability. It is robust and based on solid theoretical foundations. The index has been tested on static and dynamic test platforms, and for both platforms offered a correct assessment of proximity to voltage collapse and weakest system buses. Furthermore, a method for topology change detection suitable for online systems was proposed. Dynamic stability monitoring with PMU measurements was simulated in real-time on the well-known Kundur 10-bus system and the appropriate load shedding using the P-index was calculated. Compared to the another node-based indicator, the L-index, the results show that the P-index gives a better prediction of proximity to voltage collapse and is well suited for load shedding purposes.

Degree

M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science.

Date

8-2016

Subject

Electric power systems; Electric power distribution; Electric power system stability -- Mathematical models

Keyword

Voltage stability; Voltage collapse; Load shedding

Document Type

Masters theses

Extent

x, 59 leaves

Language

English

Rights

Under copyright.

License

http://creativecommons.org/licenses/by-nc-sa/3.0/

Date Available

8-29-2017

Available for download on Tuesday, August 29, 2017

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