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International Conference on control, Mechatronics and Automation (ICCMA)

作者： Shohan Banerjee Jiamei Deng Vineet Vajpayee Victor M. Becerra Nils Bausch S.R. Shimjith John Arul School of Built Environment Engineering and Computing Leeds Beckett University Leeds UK School of Energy and Electronic Engineering University of Portsmouth Portsmouth UK Reactor Control System Design Section Homi Bhabha National Institute Mumbai India Reactor Shielding and Data Division Indira Gandhi Centre for Atomic Research Kalpakkam India

Pressurized Water reactors are popular in the nuclear power generation industry due to their self-regulating and self-stabilizing features which in turn help them to perform load-following operation. However, fast power maneuvering is a challenging task due to inherent nonlinearity in a reactor. It leads to changes in the behavior with variation in reactor power. Further, the heat transfers from fuel to coolant and the reactivity changes due to variation in fuel and coolant temperatures introduces uncertainty in the system. Thus, it is essential to design a robust controller for load-following operation. In this paper, the point kinetics model of PWR coupled with the Mann's thermal-hydraulic model has been considered in addition to power sensor model and actuator model. This model has been identified as an interval system with bounded parametric uncertainties in measurements (fuel and coolant). The work then formulates a methodology to design a single robust PID controller using linear matrix inequalities by varying the weighting matrices. The outcomes have been validated using MATLAB simulations and discreetly exemplified in the result section.

关键词： actuators control system synthesis fission reactor kinetics heat transfer light water reactors linear matrix inequalities nuclear power stations reactivity (fission reactors) robust control three-term control uncertain systems

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Revisiting the Curie-Von Schweidler Law for Dielectric Relaxation and Derivation of Distribution Function for Relaxation Rates as Zipf’s Power Law and Manifestation of Fractional Differential Equation for Capacitor

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Journal of Modern Physics 2017年第12期8卷 1988-2012页

作者： Shantanu Das Scientist-Reactor Control System Design Section(E&I Group)Bhabha Atomic Research Centre(BARC)MumbaiIndia Honorary Senior Research Professor Condensed Matter Physics Research Centre(CMPRC)Department of PhysicsJadavpur UniversityKolkataIndia

The classical power law relaxation, i.e. relaxation of current with inverse of power of time for a step-voltage excitation to dielectric—as popularly known as Curie-von Schweidler law is empirically derived and is observed in several relaxation experiments on various dielectrics studies since late 19th Century. This relaxation law is also regarded as “universal-law” for dielectric relaxations;and is also termed as power law. This empirical Curie-von Schewidler relaxation law is then used to derive fractional differential equations describing constituent expression for capacitor. In this paper, we give simple mathematical treatment to derive the distribution of relaxation rates of this Curie-von Schweidler law, and show that the relaxation rate follows Zipf’s power law distribution. We also show the method developed here give Zipfian power law distribution for relaxing time constants. Then we will show however mathematically correct this may be, but physical interpretation from the obtained time constants distribution are contradictory to the Zipfian rate relaxation distribution. In this paper, we develop possible explanation that as to why Zipfian distribution of relaxation rates appears for Curie-von Schweidler Law, and relate this law to time variant rate of relaxation. In this paper, we derive appearance of fractional derivative while using Zipfian power law distribution that gives notion of scale dependent relaxation rate function for Curie-von Schweidler relaxation phenomena. This paper gives analytical approach to get insight of a non-Debye relaxation and gives a new treatment to especially much used empirical Curie-von Schweidler (universal) relaxation law.

关键词： Power Law Relaxation Rate Distribution Fractional Derivative Fractional Integration Curie-Von Schweidler Law Time-Constants Laplace Integral Zipf’s Law Integral Representation Time Dependent Relaxation Rate Scale Dependent Relaxation Rate Non-Debye Relaxation

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A multiresolution wavelet based subspace identification

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IFAC-PapersOnLine 2016年第1期49卷 247-253页

作者： Vajpayee, Vineet Mukhopadhyay, Siddhartha Tiwari, Akhilanand Pati Homi Bhahha National Institute Mumbai400094 India Seismology Division Bhabha Atomic Research Centre Trombay Mumbai400085 India Reactor Control System Design Section Bhabha Atomic Research Centre Trombay Mumbai400085 India

This paper presents multiresolution subspace identification as an extension of classical subspace modeling, thus inheriting features of robust subspace identification with added advantages of wavelet based modeling enabling multiresolution state-space model development. Identification of a noisy process in presence of mild nonlinearity can be approximated by estimating multiple multiresolution time invariant models. Parameter estimation in projection space at appropriate scales is achieved using least squares method. The efficacy of the proposed approach has been demonstrated by modeling nuclear reactor in prediction as well as simulation environment. It is shown that root mean squared error reduces significantly as compared to their single scale counterparts providing better modeling performances. © 2016, IF AC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Least squares approximations Identification (control systems) Mean square error Nuclear reactors State space methods Least squares methods Multi resolution subspace Multiresolution wavelets Root mean squared errors Simulation environment Subspace identification Subspace modeling Wavelets

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Demo Abstract: Observability-driven sensor deployment in smart academic environments 14

Demo Abstract: Observability-driven sensor deployment in sma...

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14th ACM Conference on Embedded Networked Sensor systems, SenSys 2016

作者： Agarwal, A. Jaiswal, K. Gudhaka, U. Munigala, V. Ramamritham, Krithi Karmakar, Gopinath Department of Computer Science Engineering Indian Institute of Technology Bombay United States Reactor Control System Design Section Bhabha Atomic Research Centre India

ISBN: (纸本)9781450342636

Saving energy without causing discomfort and without de-manding human intervention is the need of the day. It is important to develop sensor systems which not only satisfy user requirements, but also take energy consumption into consideration. In this demo, we present the sensing subsys-tems of a Smart Academic Environment, based upon the core concept of Observability' [1] which-while satisfying user needs-helps to reduce the number of sensors required. © 2016 Copyright held by the owner/author(s).

关键词： Observability

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Observability-driven Sensor Deployment in Smart Academic Environments: Demo Abstract 16

Observability-driven Sensor Deployment in Smart Academic Env...

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Proceedings of the 14th ACM Conference on Embedded Network Sensor systems CD-ROM

作者： A. Agarwal K. Jaiswal U. Gudhaka V. Munigala Krithi Ramamritham Gopinath Karmakar Department of Computer Science & Engineering Indian Institute of Technology Bombay Reactor Control System Design Section Bhabha Atomic Research Centre

ISBN: (纸本)9781450342636

Saving energy without causing discomfort and without demanding human intervention is the need of the day. It is important to develop sensor systems which not only satisfy user requirements, but also take energy consumption into consideration. In this demo, we present the sensing subsystems of a Smart Academic Environment, based upon the core concept of 'Observability' [1] which -- while satisfying user needs -- helps to reduce the number of sensors required.

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Subspace-based Wavelet preprocessed Data-driven Predictive control

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INCOSE International Symposium 2016年第S1期26卷 357-371页

作者： Vajpayee, Vineet Mukhopadhyay, Siddhartha Tiwari, Akhilanand Pati Research Scholar HBNI Mumbai400094 India Seismology Division BARC Mumbai400085 India Reactor Control System Design Section BARC Mumbai400085 India

This paper introduces a methodology for designing a subspace-based data-driven predictive control with wavelet preprocessing. In a data-driven control, especially when SNR is low, it becomes difficult to obtain reliable predictor coefficients. Therefore, it is imperative to have a processed and informative dataset for stable controller operation. Wavelet being capable of better noise rejection from process dynamics motivates to perform wavelet filtering before designing the control law. Methodology for deriving the predictor from subspace matrices of processed data is presented. A predictive controller, estimated from the dataset, is designed for power control of a nuclear reactor core for a load-following operation. The efficacy of the proposed technique is demonstrated by Monte Carlo simulations in stationary as well as non-stationary noise cases. Copyright © 2016 by Vineet Vajpayee, Siddhartha Mukhopadhyay, and Akhilanand Pati Tiwari. Published and used by INCOSE with permission.

关键词： Signal to noise ratio

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Application of model order reduction techniques to space-time kinetics model of AHWR

Application of model order reduction techniques to space-tim...

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International Conference on Industrial Instrumentation and control (ICIC)

作者： A. Rajasekhar A. P. Tiwari Madhu. N. Belur Reactor Control System Design Section Electronics & Instrumentation Group Bhabha Atomic Research Centre Mumbai Dept. of Electrical Engineering Indian Institute of Technology Mumbai

ISBN: (纸本)9781479971664

Advanced Heavy Water reactor (AHWR), a large nuclear reactor in which heat removal is based on natural circulation of light water in coolant channels, is described by an 80 th order model for accurate representation of its core neutronics behavior. The model, besides being nonlinear, is stiff and control design and analysis studies for AHWR are accompanied by serious numerical ill-conditioning problems. Hence, there is a strong motivation for obtaining reduced order model for AHWR. In particular, the application of model order reduction based on Davison's and Marshall's dominant mode retention and Singular Perturbation techniques has been explored. Also, their performance, relative to each other, has been assessed by comparing the characteristics of the three model reduction techniques with the characteristics of the original higher order model. All of these three techniques are found to be very effective in obtaining a lower order simpler models for AHWR.

关键词： Eigenvalues and eigenfunctions Zirconium Distance measurement

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An approach to the design of fault-tolerant spatial control system for a large PHWR

An approach to the design of fault-tolerant spatial control ...

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IEEE International Conference on Industrial Technology (ICIT)

作者： A.P. Tiwari B. Bandyopadhyay Bhabha Atomic Research Centre Reactor Control System Design Section Mumbai India Systems and Control Engineering Indian Institute of Technology Bombay Mumbai India

The paper presents the design of spatial control system of a large pressurized heavy water reactor (PHWR) with the constraint that the closed loop system be stable even if one output sensor has failed. Linear state models are obtained corresponding to the normal operating condition and different failure modes of the reactor. Each model is found to possess two time scale property. Application of a standard singular perturbation approach decouples the fast varying modes which are ignored to eliminate the stiffness. Thus a reduced model is obtained for each operating mode of the reactor. Convex programming is used to search for an output injection gain which stabilizes all reduced models simultaneously. This output injection gain is then realized simultaneously in all operating modes by a controller based on periodic output feedback.

关键词： Fault tolerant systems control systems Inductors Power distribution Power system modeling Output feedback State feedback Sensor systems Fission reactors Detectors

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design of fault-tolerant spatial control system for a large pressurized heavy water reactor

Design of fault-tolerant spatial control system for a large ...

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1999 European control Conference, ECC 1999

作者： Tiwari, A.P. Bandyopadhyay, B. Reactor Control System Design Section Bhabha Atomic Research Centre Trombay Mumbai400085 India Systems and Control Engg. Deptt. of Electrical Engg. IIT Bombay Mumbai400076 India

ISBN: (纸本)9783952417355

The paper presents the design of spatial control system of a large Pressurized Heavy Water reactor(PHWR) with the constraint that the closed loop system be stable even if one of the output sensors has failed. Linear state models are obtained corresponding to the normal operating condition and different failure modes of the reactor. Each model is found to possess two time scale property. Application of a standard singular perturbation approach decouples the fast varying modes which are ignored to eliminate the stiffness. Thus a reduced model is obtained for each operating mode of the reactor. Convex programming is used to search for an output injection gain which stabilizes all reduced models simultaneously. This output injection gain is then realized simultaneously in all operating modes by a controller based on periodic output feedback. © 1999 EUCA.

关键词： Convex optimization

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