Journal of Applied Mathematics

Piecewise Model and Parameter Obtainment of Governor Actuator in Turbine

Jie Zhao, Li Wang, Dichen Liu, and Jun Wang

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Abstract

The governor actuators in some heat-engine plants have nonlinear valves. This nonlinearity of valves may lead to the inaccuracy of the opening and closing time constants calculated based on the whole segment fully open and fully close experimental test curves of the valve. An improved mathematical model of the turbine governor actuator is proposed to reflect the nonlinearity of the valve, in which the main and auxiliary piecewise opening and closing time constants instead of the fixed oil motive opening and closing time constants are adopted to describe the characteristics of the actuator. The main opening and closing time constants are obtained from the linear segments of the whole fully open and close curves. The parameters of proportional integral derivative (PID) controller are identified based on the small disturbance experimental tests of the valve. Then the auxiliary opening and closing time constants and the piecewise opening and closing valve points are determined by the fully open/close experimental tests. Several testing functions are selected to compare genetic algorithm and particle swarm optimization algorithm (GA-PSO) with other basic intelligence algorithms. The effectiveness of the piecewise linear model and its parameters are validated by practical power plant case studies.

Article information

Source
J. Appl. Math., Volume 2015 (2015), Article ID 709272, 9 pages.

Dates
First available in Project Euclid: 11 June 2015

Permanent link to this document
https://projecteuclid.org/euclid.jam/1434042414

Digital Object Identifier
doi:10.1155/2015/709272

Mathematical Reviews number (MathSciNet)
MR3347335

Citation

Zhao, Jie; Wang, Li; Liu, Dichen; Wang, Jun. Piecewise Model and Parameter Obtainment of Governor Actuator in Turbine. J. Appl. Math. 2015 (2015), Article ID 709272, 9 pages. doi:10.1155/2015/709272. https://projecteuclid.org/euclid.jam/1434042414


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