Research Papers

Analysis of Influence of Fast-Cut-Back Test on 1000-MW Steam Turbine Safety

[+] Author and Article Information
Dan-mei Xie

Mem. ASME Wuhan University, Wuhan, Hubei 430072, China
e-mail: dmxie@whu.edu.cn

Yi Yang

Wuhan University,
Wuhan, Hubei 430072, China
e-mail: whupwr@gmail.com

Chang Chen

Wuhan University,
Wuhan, Hubei 430072, China
e-mail: 490188604@qq.com

Peng-fei Hu

Wuhan University,
Wuhan, Hubei 430072, China
e-mail: 337819368@qq.com

Jie Guo

Wuhan University,
Wuhan, Hubei 430072, China
e-mail: 648069187@qq.com

Wei Jiang

Wuhan University,
Wuhan, Hubei 430072, China
e-mail: 1172672529@qq.com

1Corresponding author.

Manuscript received March 5, 2015; final manuscript received April 17, 2016; published online August 19, 2016. Assoc. Editor: Chimba Mkandawire.

ASME J. Risk Uncertainty Part B 2(4), 041004 (Aug 19, 2016) (5 pages) Paper No: RISK-15-1039; doi: 10.1115/1.4033452 History: Received March 05, 2015; Accepted April 17, 2016

The capacity of the power grid in China is increasing rapidly. Because of the reliability of the multi-infeed direct current (DC) system in the grid, power-system damping is relatively weak. Realizing isolated island operation of thermal power units with fast-cut-back (FCB) ability is considered to be the best solution for the quick restoration of the power grid. Taking a 1000-MW ultra-supercritical (USC) unit as an example, based on the field-test data of load rejection, this paper studies the dynamic responses of the turbine side during the FCB process. First, the maximum speed increase of the rotor during the FCB process with different loads is simulated using software. Second, the water levels of the deaerator and condenser during the FCB process are predicted with different loads using the same method. Third, the highest exhaust steam temperature of the high-pressure (HP) cylinder during the FCB process is calculated and predicted with different loads using finit-element modeling (FEM). Fourth, these key parameters are compared with the field FCB test data, and the comparison shows that the predicted results agree with the field-test data very well. Finally, the influence of the FCB test on the safety and life loss of the turbine side is analyzed.

Copyright © 2016 by ASME
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Grahic Jump Location
Fig. 1

Simulation block of digital electric hydraulic (DEH) control system

Grahic Jump Location
Fig. 2

Dynamic characteristics of the DEH control system




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