Synchrophasor based out-of-step protection in modern power grid

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SHAIK, M. A. H. A. B. O. O. B. S. U. B. H. A. N. (2017). Synchrophasor based out-of-step protection in modern power grid. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

Power systems are continually subjected to wide range of disturbances and they must adjust to these changes and continue to operate satisfactorily. Small disturbance instability and transient instability are major threats to power system security which can cause out of step conditions. The majority of out-of-step protection systems installed throughout the world use local measurements that is voltage and current measurements at one end of transmission line. The disadvantage of this scheme is its inability to have knowledge about the other parts of the complex power network. Even though, the out-of-step tripping system is well designed and appropriately set, it still has a number of disadvantages in minimizing the effects of the disturbance. In this context, there is a need for Special Protection Schemes (SPS) which receive the data from more than one locations and process the decisions in wide area orientation. More recent technological advancements in microprocessor based relays, combined with GPS receivers for synchronization and accurate time stamping, are providing synchronized measurements called synchrophasors. In this thesis an out-of-step detection algorithm is proposed using system total transient energy based on the synchrophasor data obtained from phasor measurement units. Conventional out-of-step detection techniques are discussed and compared with proposed algorithm. The main advantage of the proposed method is that, it detects unstable swings faster than conventional methods. Further, a method for power system stabilizer (PSS) design is discussed and the performance of the performance of out-of-step protection with PSS is studied.

Details
Author

SHAIK, MAHABOOB SUBHAN

Title

Synchrophasor based out-of-step protection in modern power grid

Physical Description

1 online resource (135 pages) : PDF

Date

2017

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

Power systems are continually subjected to wide range of disturbances and they must adjust to these changes and continue to operate satisfactorily. Small disturbance instability and transient instability are major threats to power system security which can cause out of step conditions. The majority of out-of-step protection systems installed throughout the world use local measurements that is voltage and current measurements at one end of transmission line. The disadvantage of this scheme is its inability to have knowledge about the other parts of the complex power network. Even though, the out-of-step tripping system is well designed and appropriately set, it still has a number of disadvantages in minimizing the effects of the disturbance. In this context, there is a need for Special Protection Schemes (SPS) which receive the data from more than one locations and process the decisions in wide area orientation. More recent technological advancements in microprocessor based relays, combined with GPS receivers for synchronization and accurate time stamping, are providing synchronized measurements called synchrophasors. In this thesis an out-of-step detection algorithm is proposed using system total transient energy based on the synchrophasor data obtained from phasor measurement units. Conventional out-of-step detection techniques are discussed and compared with proposed algorithm. The main advantage of the proposed method is that, it detects unstable swings faster than conventional methods. Further, a method for power system stabilizer (PSS) design is discussed and the performance of the performance of out-of-step protection with PSS is studied.

Genre

masters theses

Subjects--Topics

Electrical engineering

Degree

M.S.

Keywords

Out-Of-Step Protection
Protection

Subject Area

Electrical Engineering

Advisor(s)

Kamalasadan, Sukumar

Committee Members

Cecchi, Valentina
Chowdhury, Badrul

Degree Note

Thesis (M.S.)--University of North Carolina at Charlotte, 2017.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

SHAIK_uncc_0694N_11312

Permalink

http://hdl.handle.net/20.500.13093/etd:675