DocumentCode :
3215102
Title :
Protective Relay Settings of Tie Line Tripping and Load Shedding for an Integrated Steel-Making Cogeneration System
Author :
Chen, Chao-Shun ; Hsu, Cheng-Ting ; Lee, Yih-Der ; Ting, D.S. ; Shen, C.C.
Author_Institution :
Dept. of Electr. Eng., I Shou Univ., Kaohsiung
fYear :
2008
fDate :
5-9 Oct. 2008
Firstpage :
1
Lastpage :
8
Abstract :
This paper presents the protective relay settings of tie line and design of load shedding scheme for an integrated steelmaking industrial power system to ensure the system stability after severe fault contingency on external utility power network. The transient stability analysis of the industrial power system with the equivalent external Taipower system has been executed for an actual fault contingency in 2005. The mathematical models of 13 cogeneration units in the plant and large generators of a nearby Taipower thermal plant are included in the computer simulation to solve the system transient response for the fault contingency to verify the accuracy of the models used. To prevent the shutdown of critical loads due to external fault contingency, the under voltage and under/over frequency relays with proper settings are applied for the tripping of external and internal tie lines. To restore the power system stability for the islanding operation of the industrial cogeneration system after tie line tripping, the load shedding is designed to disconnect a proper amount of non-critical loads according to the governor response and protective constraints of cogeneration units. After performing the transient stability analysis of the industrial power system with the proposed protective relay setting and load shedding scheme, it is found that the voltage sag and oscillation problem caused by external Taipower system fault contingency can be mitigated by the tie line tripping in time to prevent the shutdown of critical loads and tripping of cogeneration units.
Keywords :
cogeneration; fault diagnosis; industrial power systems; load shedding; power system transient stability; relay protection; Taipower thermal plant; fault contingency; industrial power system; integrated steel-making cogeneration system; islanding operation; load shedding; over frequency relays; protective relay settings; tie line tripping; transient stability analysis; under voltage frequency relays; Cogeneration; Industrial power systems; Mathematical model; Power system protection; Power system relaying; Power system stability; Power system transients; Protective relaying; Stability analysis; Transient analysis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industry Applications Society Annual Meeting, 2008. IAS '08. IEEE
Conference_Location :
Edmonton, Alta.
ISSN :
0197-2618
Print_ISBN :
978-1-4244-2278-4
Electronic_ISBN :
0197-2618
Type :
conf
DOI :
10.1109/08IAS.2008.334
Filename :
4659122
Link To Document :
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