Design of NDI-SMC based robust hybrid nonlinear controller for load following operation in pressurized water reactor

•NDI plus SMC based robust controller is designed for PWR core.•Xenon oscillation is considered.•Robustness of NDI plus SMC controller over single NDI controller has been proved and demonstrated for PWR core.•Varying range of parametric uncertainty and external disturbances has been considered. The...

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Published in:Nuclear engineering and design Vol. 363; p. 110604
Main Authors: Yadav, Deepak Kumar, Gupta, Amitava, Munshi, Prabhat
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01.07.2020
Elsevier BV
Subjects:
Algorithms
Automatic control
Complex systems
Computer simulation
Control rods
Control systems design
Controllers
Disturbances
Dynamic inversion
Dynamical systems
Hybrid robust nonlinear controller
NDI
Nonlinear control
Nonlinear dynamics
Nuclear energy
Nuclear fuels
Oscillations
Parametric uncertainty/disturbances
Pressurized water reactor
Pressurized water reactors
Reactors
Robust control
Sliding mode control
SMC
State feedback
State feedback control
Tracking control
Uncertainty
Xenon
Xenon oscillation
State feedback control
NDI
SMC
Hybrid robust nonlinear controller
Xenon oscillation
Parametric uncertainty/disturbances
Pressurized water reactor
ISSN:0029-5493, 1872-759X
Online Access:Get full text
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Summary:•NDI plus SMC based robust controller is designed for PWR core.•Xenon oscillation is considered.•Robustness of NDI plus SMC controller over single NDI controller has been proved and demonstrated for PWR core.•Varying range of parametric uncertainty and external disturbances has been considered. The pressurized water reactor (PWR) is a natural choice for the load following operation due to its inherent self-regulating nature. The nonlinear mathematical model of PWR is derived considering the large parametric uncertainties due to power variation, Xenon oscillations and external disturbances in the reactor core. This paper proposes a robust and tracking hybrid nonlinear state feedback tracking controller which combines nonlinear dynamic inversion (NDI) and the sliding mode control (SMC) algorithm to achieve a smooth load following operation for such complex system. The proposed nonlinear controller is able to ensure satisfactory performances e.g. smooth tracking of reference power and nullify the xenon oscillations in PWR core. This designed controller is also capable to satisfy the limits of the variables like (a) zonal coolant temperature, (b) average fuel temperature and (c) external control rod reactivity for such system in PWR core during the operation. The performance of the proposed nonlinear controller is further compared with the single NDI based controller to show the effectiveness of the proposed methodology against the varying parametric uncertainties and external disturbances. This paper demonstrates the simulation results using Matlab/Simulink platform.
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ISSN:0029-5493
1872-759X
DOI:10.1016/j.nucengdes.2020.110604