Predictive Energy Function Based Power System Transient Stability Assessment and Improvement

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SAHAMI, A. M. I. R. R. E. Z. A. (2019). Predictive Energy Function Based Power System Transient Stability Assessment and Improvement. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

Transient stability assessment and improvement are critical for power grid operation. It deals with the assessment of transient behavior of the power grid (especially the generators) when subjected to large disturbances. State-of-the-art approaches for transient assessment are classified into two: a) numerical methods and b) direct energy functions methods. Numerical methods are computationally expensive and current energy function methods require extensive system knowledge in advance. In this dissertation, two new approaches for transient stability assessment is investigated. First, a new method for predicting the behavior of power system generators is presented. The main advantage of this method is that it helps to find the critical generators, their critical clearing times and angles. Consequently, the system transient stability prediction can be performed. Also, using the Lyapunov theory and energy concept, the prediction can be used to find the unstable equilibrium point of the system. Second, an approach for assessing the potential energy capacity of the power system to prevent and control the transient instability of the power system is proposed. The approach can be used to find the appropriate control strategy so that system instability can be prevented.The proposed methods are tested on IEEE 9 bus, IEEE 39 bus, and North Carolina - South Carolina 500 bus systems. The results and discussions are provided.

Details
Author

SAHAMI, AMIRREZA

Title

Predictive Energy Function Based Power System Transient Stability Assessment and Improvement

Physical Description

1 online resource (216 pages) : PDF

Date

2019

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

Transient stability assessment and improvement are critical for power grid operation. It deals with the assessment of transient behavior of the power grid (especially the generators) when subjected to large disturbances. State-of-the-art approaches for transient assessment are classified into two: a) numerical methods and b) direct energy functions methods. Numerical methods are computationally expensive and current energy function methods require extensive system knowledge in advance. In this dissertation, two new approaches for transient stability assessment is investigated. First, a new method for predicting the behavior of power system generators is presented. The main advantage of this method is that it helps to find the critical generators, their critical clearing times and angles. Consequently, the system transient stability prediction can be performed. Also, using the Lyapunov theory and energy concept, the prediction can be used to find the unstable equilibrium point of the system. Second, an approach for assessing the potential energy capacity of the power system to prevent and control the transient instability of the power system is proposed. The approach can be used to find the appropriate control strategy so that system instability can be prevented.The proposed methods are tested on IEEE 9 bus, IEEE 39 bus, and North Carolina - South Carolina 500 bus systems. The results and discussions are provided.

Genre

doctoral dissertations

Subjects--Topics

Electrical engineering

Degree

Ph.D.

Keywords

Direct Methods
Energy Function
Power System
Taylor Series
Transient Stability

Subject Area

Electrical Engineering

Advisor(s)

Kamalasadan, Sukumar

Committee Members

Kamalasadan, Sukumar
Cecchi, Valentina
Parkhideh, Babak
Pulugurtha, Srinivas
Salami, Zia

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2019.

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Identifier

SAHAMI_uncc_0694D_12022

Permalink

http://hdl.handle.net/20.500.13093/etd:1930