Work

System States and Disturbance Estimation Using Adaptive Integral Terminal Sliding Mode Observer for U‐Tube Steam Generator Model in Nuclear Power Plant

Year: 2025

Type: article

Abstract: ABSTRACT Designing water level control for a U‐tube steam generator (UTSG) in nuclear power plants (NPP) remains a challenge, especially at low power demand due to unreliable steam flow measurements. This paper addresses the steam flow rate as a disturbance to the plant, treating it as an inaccessible variable. To estimate the disturbance (steam flow rate) and system states, an adaptive integral terminal sliding mode observer is developed. These estimated values can be utilized in the water level control design to enhance the reliability and performance of the control system. An adaptive observer is developed such that the augmented systems formed by the error dynamical systems and the designed adaptive laws are globally uniformly ultimately bounded. This technique is applied to a non‐minimum phase system model representing the UTSG system to improve water level control and prevent possible serious consequences. Various disturbance signal forms with different amplitudes are simulated to demonstrate the reliability of the proposed technique. The simulation results show the effectiveness of the method proposed in this paper.

Source: IET Control Theory and Applications

DOI: 10.1049/cth2.70050

Authors: Mokhtar Mohamed, Iestyn Pierce, Xinggang Yan, Hafiz Ahmed

Institutions: University of Bristol, Bangor University, University of Kent, University of Sheffield

Language: English

Topic: Adaptive Control of Nonlinear Systems

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,300

Funders: Bangor University, Engineering and Physical Sciences Research Council, European Regional Development Fund, CHIST-ERA