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International Workshop on Variable Structure systems, VSS

作者： S. Janardhanan B. Bandyopadhyay A.G. Abera Interdisciplinary Programme in Systems and Control Engineering Indian Institute of Technology Bombay India

Though continuous-time sliding mode control has a variety of desirable properties, its discrete-time counterpart does not guarantee the same performance. This is due to the fact that most of the discrete-time sliding mode control algorithms are based on reaching laws that are only approximations of continuous-time reaching laws and thus may not give a performance close to continuous-time sliding mode control. This paper presents a method of multirate output feedback based discrete-time control design which guarantees the closest possible performance for a pre-designed continuous-time sliding mode control algorithm

关键词： Output feedback Sliding mode control control systems Sampling methods Robust control Digital control Signal design control design State-space methods Uncertain systems

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DIAGNOSIS OF FAULTS WITH VARYING INTENSITIES USING POSSIBILISTIC CLUSTERING AND FAULT LINES

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IFAC Proceedings Volumes 2006年第2期39卷 905-910页

作者： K.P. Detroja R.D. Gudi S.C. Patwardhan Interdisciplinary Programme on Systems and Control Engineering Department of Chemical Engineering Indian Institute of Technology Bombay Powai Mumbai – 400076 India

In this paper, a new approach for fault detection and isolation that is based on the possibilistic clustering algorithm is proposed. Fault detection and isolation (FDI) is shown here to be a pattern classification problem, which can be solved using clustering and classification techniques. The possibilistic clustering approach was proposed to address some of the short comings of the fuzzy c-means (FCM) algorithm. The probabilistic constraint imposed on the membership value in the FCM algorithm is relaxed in the possibilistic clustering algorithm. Because of this relaxation, the possibilistic approach is shown in this paper to give more consistent results in the context of the FDI tasks. The proposed approach addresses the issue of correctly isolating a fault that may occur with varying intensities. The concept of fault lines is introduced, which in conjunction with possibilistic clustering has been effectively used for FDI. Fault signatures that change as a function of the fault intensities are represented as fault lines, which are shown to be useful to classify faults that can manifest with different intensities. The proposed approach has been validated here through simulations involving a co-polymerization reactor simulation.

关键词： Possibilistic clustering Fuzzy c-means clustering Gustafson-Kessel algorithm Fault Detection (FDD)

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Relay-free Second Order Sliding Mode control

Relay-free Second Order Sliding Mode Control

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IEEE International Conference on Industrial technology (ICIT)

作者： S. Janardhanan IDP in Systems and Control Engineering Indian Institute of Technology Bombay Mumbai India

The paper presents an approach for achieving second order sliding mode in continuous-time systems. The existing methods of second order sliding mode control are based on relay control in the derivative of the input. Such a control, though continuous, is not smooth in close proximity of the sliding surface. The proposed control algorithm achieves second order sliding mode by using a smooth control signal which avoids the use of a relay in the control.

关键词： Relays Sliding mode control control systems Switches State-space methods Actuators Frequency Terminology Closed loop systems Fatigue

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FAULT DETECTION USING CORRESPONDENCE ANALYSIS: APPLICATION TO TENNESSEE EASTMAN CHALLENGE PROBLEM

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IFAC Proceedings Volumes 2006年第2期39卷 705-710页

This paper presents an approach based on the use of correspondence analysis (CA) for the task of fault detection and diagnosis. Unlike other tools (PCA / DPCA) that are used for this latter task, CA is shown to use a different metric to represent the information content in the data matrix X . Decomposition of the information represented in the metric is shown to yield superior performance from the viewpoints of data compression, discrimination and classification as well as early detection of faults. We demonstrate these performance improvements over PCA and DPCA on the Tennessee Eastman problem, which is a representative benchmark problem used in the literature. CA is shown to yield vastly superior performance for the monitoring of the TE problem, when compared with PCA and DPCA.

关键词： Correspondence Analysis (CA) Principal Components Analysis (PCA) Dynamic PCA (DPCA) Fault Detection (FD)

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Digital Redesign of Sliding Mode control Algorithms Using Saturation Function: State and Multirate Output Feedback Approach

Digital Redesign of Sliding Mode Control Algorithms Using Sa...

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IEEE Conference on Decision and control

作者： Alemayehu G/E Abera B. Bandyopadhyay S. Janardhanan Interdisciplinary Programme Systems and Control Engineering Indian Institute of Technology Bombay India

ISBN: (纸本)1424401704;9781424401703

Though continuous-time sliding mode control has a variety of desirable properties, its discrete-time counterpart does not guarantee the same performance. This is due to the fact that most of the discrete-time sliding mode control algorithms are based on reaching laws that are only approximations of continuous-time reaching laws and thus may not give a performance close to continuous-time sliding mode control. This paper presents a method for digital redesign of sliding mode control using saturation function based on state feedback. The method is extended to multirate output feedback case. It is shown that performance of the proposed controller is close to the performance of a pre-designed continuous-time sliding mode control algorithm. The method is illustrated by a numerical example

关键词： Sliding mode control Output feedback control systems State feedback Digital control Sampling methods Signal design USA Councils State-space methods Closed loop systems

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PLL-less one cycle controlled bi-directional high power factor ac to dc converter

PLL-less one cycle controlled bi-directional high power fact...

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37th IEEE Power Electronics Specialists Conference 2006, PESC'06

作者： Ghodke, Dharmraj V. Fernandes, B.G. Chatterjee, Kishore Centre for Advanced Technology Laser System Engineering Division Indore-452013 Indian Institute of Technology Bombay Department of Electrical Engineering Power Electronics and Power Systems Mumbai-400076

ISBN: (纸本)0780397169

Ac to dc converters based on one cycle control (OCC) exhibits instability in current control at light load conditions as well as when it is operating in the inverting mode. In this paper a modified OCC for a bi-directional ac to dc converter is proposed. The proposed technique neither requires the knowledge of the 60° angular sectors of input voltage nor it requires the service of additional multiplexers or any other complicated circuitry. A fictitious current component in phase with the utility voltage is synthesized. The sum of this current component and the actual load current is compared with the triangular waveform to generate the gating pulses for the switches. This modification not only renders stability to the converter at light load conditions and inverting mode of operations, but also enable the converter to transfer its operation seamlessly from rectifying mode to inverting mode and vice versa. Detailed simulation studies are carried out to verify the effectiveness of the proposed scheme. In order to validate the viability of the scheme, detailed experimental studies are carried out on a scaled down 2 kW laboratory prototype developed for the purpose.

关键词： Power converters

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Effects of information synchronization frequency on the stability of supply chains

Effects of information synchronization frequency on the stab...

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2006 IIE Annual Conference and Exposition

作者： Venkateswaran, Jayendran Son, Young-Jun Industrial Engineering and Operations Research Indian Institute of Technology Bombay Mumbai 400076 India Department of Systems and Industrial Engineering University of Arizona Tucson AZ 85721 United States

With modern supply chains hurtling towards 'information overloading,' it is of great interest to know what data is required for effective decision making and how often the data needs to be updated. The latter part on how often is the focus of this paper. The inventory and production ordering policies among the players (Manufacturer and Distributors) of a two echelon supply chain are studied. System dynamics models of the different players are developed. Z-transform techniques are employed to derive the general stability condition. Stability of the supply chain under different strategies (communicative vs. vendor managed inventory) is appraised and their implications on the information synchronization needs are analyzed.

关键词： Supply chain management

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Backstepping technique based nonlinear controller for a textile dyeing process

Backstepping technique based nonlinear controller for a text...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： B. Bandyopadhyay J. V. Desai C. D. Kane Systems & Control Engineering Indian Institute of Technology Bombay Mumbai India Textile and Engineering Institute Ichalkaranji India

This paper describes a control scheme for a MIMO system using backstepping method. Backstepping method is preferred in case of uncertainties in the process and constraints acting on the control input. In the present work, backstepping method for a PMTD process is investigated in order to maintain the concentration and volume of the dye bath thereby reduce the tailing effect. The proposed control strategy is designed and simulated using Matlab/simulink and results are presented to validate the proposed control scheme

关键词： Backstepping Fabrics Mathematical model Nonlinear control systems control systems Feeds Nonlinear equations control engineering Textile technology MIMO

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Modified Sector Scheme to Overcome Flux Drooping of Direct Torque controlled IPMSM

Modified Sector Scheme to Overcome Flux Drooping of Direct T...

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Annual Conference of Industrial Electronics Society

作者： Priya Verma B.G. Fernandes Department of Energy Systems Engineering Indian Institute of Technology Bombay India Department of Electrical Engineering Indian Institute of Technology Bombay India

Flux drooping occurs at the sector transition in direct torque controlled drives especially at low speed and high load operating conditions. A comprehensive analysis of this phenomenon and the schemes reported in the literature to address this limitation are presented in the paper. In addition, an efficient control scheme is proposed to minimize the flux drooping at sector boundaries. The proposed scheme is independent of the machine parameters and is easy to implement. Results of the hardware-in-the-loop (HIL) simulation studies carried out on DSP TMS320F240 prove the validity of the proposed scheme

关键词： Torque control Stators Sensorless control Sampling methods Voltage control Functional analysis Hysteresis motors control systems Power engineering and energy systems engineering and theory

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Novel maximum power point tracker for stand-alone self-excited induction generator

Novel maximum power point tracker for stand-alone self-excit...

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India International Conference on Power Electronics (IICPE)

作者： G.V. Jayaramaiah B.G. Fernandes Energy Systems Engineering Indian Institute of Technology Bombay Mumbai Maharashtra India Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai Maharashtra India

In this paper, a simple control strategy for maximum power extraction from stand-alone wind energy conversion system using induction generator under variable speed and load conditions is proposed. This is achieved by varying the inverter frequency and modulation index depending upon the changes in load at the IG terminal. The proposed method eliminates the need of a speed encoder, and hence itpsilas an attractive sensor-less control method. The developed model is simulated in MATLAB/SIMULINK. The simulation results are presented to validate the developed control strategy. The control algorithm is implemented on TMS320F243 DSP. Experimental results closely resemble the simulated results.

关键词： Induction generators Pulse width modulation inverters control systems Frequency Capacitors Digital signal processing Reactive power Wind turbines Voltage control Power electronics

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