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Research Papers

Whole-Range Nonlinear Large Disturbance Attenuation Controller Design for Turbo Generator Steam Valve Systems

[+] Author and Article Information
Nan Jiang

e-mail: jiangnan@ise.neu.edu.cn

Ting Liu, Xiujuan Dong

Faculty of Information Science and Engineering,
Northeastern University,
Shenyang 110819, China

Shengtao Li

Faculty of Information Science and Engineering,
Shandong Normal University,
Shandong 250000, China

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received October 15, 2012; final manuscript received August 15, 2013; published online September 27, 2013. Assoc. Editor: YangQuan Chen.

J. Dyn. Sys., Meas., Control 136(1), 011009 (Sep 27, 2013) (9 pages) Paper No: DS-12-1345; doi: 10.1115/1.4025259 History: Received October 15, 2012; Revised August 15, 2013

For a class of strongly nonlinear reheat-type turbo generator steam valve control problem, a whole-range nonlinear adaptive large disturbance attenuation control scheme is investigated based on the Minimax and adaptive Backstepping method. The effect of unknown external disturbances on the rotor angle and the rotor speed of the generator are considered. The Minimax method is used to reduce effectively the conservativeness of the disturbance treatment, which is brought by the estimation of the upper bound of the disturbance and the inequality scaling. The purpose is to ensure the robustness and insensitivity to effects of large disturbances of the closed-loop system. By considering the effect of the short-circuit ground fault and the mechanical power of disturbances, an application of the single-machine infinite-bus system is researched. Simulation results show that the control scheme can effectively improve the dynamic process of the transient stability of the power system. Compared with the conventional nonlinear controller, the control scheme has more advantages for large disturbances, and the process of controller design is simple and intuitive.

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Figures

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Fig. 2

The transient responding curves of the closed-loop system with controllers (23) and (24) when 30% recoverable disturbance occurs in the mechanical power

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Fig. 3

The transient responding curves of the closed-loop system with the conventional controller when 30% recoverable disturbance occurs in the mechanical power

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Fig. 4

The transient responding curves of the closed-loop system with controllers (23) and (24) when 30% unrecoverable disturbance occurs in the mechanical power

Grahic Jump Location
Fig. 5

The transient responding curves of the closed-loop system with the conventional controller when 30% unrecoverable disturbance occurs in the mechanical power

Grahic Jump Location
Fig. 6

The transient responding curves of the closed-loop system with controllers (23) and (24) when a transmission line occurs in the recoverability of the short-circuit fault

Grahic Jump Location
Fig. 7

The transient responding curves of the closed-loop system with the conventional controller when a transmission line occurs in the recoverability of the short-circuit fault

Grahic Jump Location
Fig. 8

The transient responding curves of the closed-loop system with controllers (23) control system and (24) when a transmission line occurs in the permanent short-circuit fault

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Fig. 9

The transient responding curves of the closed-loop system with the conventional controller when a transmission line occurs in the permanent short-circuit fault

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