Title page for ETD etd-61797-12279


Type of Document Master's Thesis
Author Vidalinc, Antoine Jr.
Author's Email Address avidalin@vt.edu
URN etd-61797-12279
Title On-Line Transient Stability Analysis of a Multi-Machine Power System Using the Energy Approach
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Mili, Lamine M. Committee Chair
Liu, Yilu Committee Member
Phadke, Arun G. Committee Member
Keywords
  • power systems
  • transient stability
  • real-time
  • phasor
  • on-line
Date of Defense 1997-07-15
Availability unrestricted
Abstract
This thesis investigates and develops a direct method for transient

stability analysis using the energy approach [1] and the Phasor Measurement

Units (PMUs). The originality of this new method results from a combination

of a prediction of the post-fault trajectory based on the PMUs and the

Transient Energy Function of a multimachine system. Thanks to the PMUs, the

weakness of the direct methods, which is the over-simplification of the

generator model, is overcome. This new method consists of fitting a curve to

the data of the post-fault path provided by PMUs and identifying the

controlling unstable equilibrium point (c.u.e.p.). Two second-order linear

models have been estimated and evaluated from a prediction viewpoint. These

are a polynomial function and an auto-regressive model. These parameters

have been estimated by means of the least-squares estimator. They have been

compared to the model proposed by Y. Ohura et al. [6], which has been upgraded

into an iterative algorithm. The post-fault trajectory is predicted until

the exit point located on the Potential Energy Boundary Surface (p.e.b.s.) is

reached. In order to detect with efficiency this exit point and to find the

c.u.e.p., it is proposed a combination of the so called "Ball-Drop" method

[22] and an improved version of the Shadowing method. These combined

procedures give accurate results when they are compared to the step-by-step

method, which directly integrates the differential equations using a

fourth-order Runga-Kutta method. The simulations have been carried out on

a 3-machine system and on the 10-machine New-England power system.

Files
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  Chapt1.pdf 9.03 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01
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  Chapt3c.pdf 25.06 Kb 00:00:06 00:00:03 00:00:03 00:00:01 < 00:00:01
  Chapt4a.pdf 60.94 Kb 00:00:16 00:00:08 00:00:07 00:00:03 < 00:00:01
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  Chapt4c.pdf 48.06 Kb 00:00:13 00:00:06 00:00:06 00:00:03 < 00:00:01
  Chapt4d.pdf 34.93 Kb 00:00:09 00:00:04 00:00:04 00:00:02 < 00:00:01
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  Chapt6.pdf 11.96 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  Dixa.pdf 13.13 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01
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  Etd.pdf 17.82 Kb 00:00:04 00:00:02 00:00:02 00:00:01 < 00:00:01
  Refrs.pdf 7.42 Kb 00:00:02 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01
  Vita.pdf 3.80 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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