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Adaptive second-order nonsingular terminal sliding mode power-level control for nuclear power plants

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주제분류원자력공학

초록

This paper focuses on the power-level control of nuclear power plants (NPPs) in the presence of lumpeddisturbances. An adaptive second-order nonsingular terminal sliding mode control (ASONTSMC) schemeis proposed by resorting to the second-order nonsingular terminal sliding mode. The pre-existingmathematical model of the nuclear reactor system is firstly described based on point-reactor kineticsequations with six delayed neutron groups. Then, a second-order sliding mode control approach isproposed by integrating a proportional-derivative sliding mode (PDSM) manifold with a nonsingularterminal sliding mode (NTSM) manifold. An adaptive mechanism is designed to estimate the unknownupper bound of a lumped uncertain term that is composed of lumped disturbances and system statesreal-timely. The estimated values are then added to the controller, resulting in the control system capableof compensating the adverse effects of the lumped disturbances efficiently. Since the sign function iscontained in the first time derivative of the real control law, the continuous input signal is obtained afterintegration so that the chattering effects of the conventional sliding mode control are suppressed. Therobust stability of the overall control system is demonstrated through Lyapunov stability theory. Finally,the proposed control scheme is validated through simulations and comparisons with a proportionalintegral-derivative (PID) controller, a super twisting sliding mode controller (STSMC), and a disturbance observer-based adaptive sliding mode controller (DO-ASMC)

Abstract

This paper focuses on the power-level control of nuclear power plants (NPPs) in the presence of lumpeddisturbances. An adaptive second-order nonsingular terminal sliding mode control (ASONTSMC) schemeis proposed by resorting to the second-order nonsingular terminal sliding mode. The pre-existingmathematical model of the nuclear reactor system is firstly described based on point-reactor kineticsequations with six delayed neutron groups. Then, a second-order sliding mode control approach isproposed by integrating a proportional-derivative sliding mode (PDSM) manifold with a nonsingularterminal sliding mode (NTSM) manifold. An adaptive mechanism is designed to estimate the unknownupper bound of a lumped uncertain term that is composed of lumped disturbances and system statesreal-timely. The estimated values are then added to the controller, resulting in the control system capableof compensating the adverse effects of the lumped disturbances efficiently. Since the sign function iscontained in the first time derivative of the real control law, the continuous input signal is obtained afterintegration so that the chattering effects of the conventional sliding mode control are suppressed. Therobust stability of the overall control system is demonstrated through Lyapunov stability theory. Finally,the proposed control scheme is validated through simulations and comparisons with a proportionalintegral-derivative (PID) controller, a super twisting sliding mode controller (STSMC), and a disturbance observer-based adaptive sliding mode controller (DO-ASMC)

참고문헌 (39)

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