Analysis and control of a nonlinear boiler-turbine unit

Tan, Wen; Marquez, Horacio J.; Chen, Tongwen; Liu, Jizhen

doi:10.1016/j.jprocont.2005.03.007

Cited by 151 publications

(74 citation statements)

References 19 publications

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“…In our experiments we used a normal operating point for the BWPP in which the pressure equals 108 kg/cm 2 , that was achieved by keeping the three valves in the following normal valve positions (NVP): u 1 = 0.34, u 2 = 0.69 and u 3 = 0.433 [14]. As a consequence, TCCs, that implement the control logic code, must maintain constant the position of the three valves in order to provide a constant steam pressure of 108 kg/cm 2 .…”

Section: Boiling Water Power Plantmentioning

confidence: 99%

Impact of Network Infrastructure Parameters to the Effectiveness of Cyber Attacks Against Industrial Control Systems

Genge

Siaterlis

Hohenadel

2014

INT J COMPUT COMMUN

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Abstract:The fact that modern Networked Industrial Control Systems (NICS) depend on Information and Communication Technologies (ICT), is well known. Although many studies have focused on the security of SCADA systems, today we still lack the proper understanding of the effects that cyber attacks have on NICS. In this paper we identify the communication and control logic implementation parameters that influence the outcome of attacks against NICS and that could be used as effective measures for increasing the resilience of industrial installations. The implemented scenario involves a powerful attacker that is able to send legitimate Modbus packets/commands to control hardware in order to bring the physical process into a critical state, i.e. dangerous, or more generally unwanted state of the system. The analysis uses a Boiling Water Power Plant to show that the outcome of cyber attacks is influenced by network delays, packet losses, background traffic and control logic scheduling time. The main goal of this paper is to start an exploration of cyber-physical effects in particular scenarios. This study is the first of its kind to analyze cyber-physical systems and provides insight to the way that the cyber realm affects the physical realm.

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Section: Boiling Water Power Plantmentioning

confidence: 99%

Impact of Network Infrastructure Parameters to the Effectiveness of Cyber Attacks Against Industrial Control Systems

Genge

Siaterlis

Hohenadel

2014

INT J COMPUT COMMUN

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“…Recently, a nonlinearity measure via gap metric is proposed to assess the nonlinearity of the nonlinear system [20], [21]. Grid the operating space of the forcedcirculation byNoperating points, and the nonlinearity measure is defined as [21] (27) where L i N L, L j N L are linearization systems of the nonlinear plant at the i -th and the j -th operating point, respectively.…”

Section: ) Gap-metric-based Nonlinearity Measure For the Forcedcircumentioning

confidence: 99%

Adaptive Decoupling Switching Control of the Forced-Circulation Evaporation System Using Neural Networks

Wang

Chai

et al. 2013

IEEE Trans. Contr. Syst. Technol.

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Abstract-For the forced-circulation evaporation process of alumina production, the control objectives include maintaining the liquid level and fast tracking of the product density with respect to its setpoint. However, with the strong coupling between the level control and product density control loops and the process exhibits strong nonlinearities, conventional control strategies, such as proportional-integral-derivative and other linear control design, cannot achieve satisfactory control performance and meet production demands. By augmenting the forced-circulation evaporation system model with dynamics of its operating valves, a nonlinear adaptive decoupling switching control strategy is proposed. This control strategy includes a linear adaptive decoupling controller, a neural-network-based nonlinear adaptive decoupling controller, and a switching mechanism. The linear adaptive decoupling controller is used to reduce the coupling between the two control loops. The neural-network-based nonlinear adaptive decoupling controller is employed to improve the transient performance and reduce the effects of the nonlinearities on the system, and the switching mechanism is introduced to guarantee the input-output stability of the closed-loop system. Simulation results show that the proposed method can decouple the loops effectively for the forced-circulation evaporation system and thus improve the evaporation efficiency.

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“…The boiler-turbine dynamics can be described by a nonlinear model of the 3 rd order, [1,8]. For individual subsystems we use the linearized model derived in [1], respective to one of operating points.…”

Section: Boiler-turbine Modelmentioning

confidence: 99%

Robust Decentralized Controller Design: Subsystem Approach

Rosinová¹,

Thuan²,

Veselý³

et al. 2012

Journal of Electrical Engineering

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The paper addresses the problem of the robust output feedback PI controller design for complex large-scale stable systems with a state decentralized control structure. A decentralized control design procedure is proposed for static output feedback control which is based on solving robust control design problems of subsystems' size. The presented approach is based on the Generalized Gershgorin Theorem and uses the so-called equivalent subsystems approach to consider the interactions in the local robust controller design. The resulting decentralized control scheme has been successfully tested on two examples: a linearized model of three interconnected boiler-turbine subsystems and a linear model of four cooperating DC motors where the problem is to design four local PI controllers for a large scale system which will guarantee robust stability and performance of the closed-loop uncertain system.

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Analysis and control of a nonlinear boiler-turbine unit

Cited by 151 publications

References 19 publications

Impact of Network Infrastructure Parameters to the Effectiveness of Cyber Attacks Against Industrial Control Systems

Impact of Network Infrastructure Parameters to the Effectiveness of Cyber Attacks Against Industrial Control Systems

Adaptive Decoupling Switching Control of the Forced-Circulation Evaporation System Using Neural Networks

Robust Decentralized Controller Design: Subsystem Approach

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