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International Symposium on Power Electronics, electrical Drives, automation and Motion, SPEEDAM

作者： K. Ghedamsi D. Aouzellag E.M. Berkouk Electrical engineering Department A.Mira University Bejaia Algeria Control Process Laboratory Algiers Algeria

In order to meet power needs, taking into account economical and environmental factors, wind energy conversion is gradually gaining interest as a suitable source of renewable energy. In this paper, a grid connected wind power generation scheme using a doubly fed induction generator with a direct AC-AC matrix converter is proposed. The aims of this paper are: to model and to simulate the operation of a doubly fed induction generator; the analysis employs a stator flux vector control algorithm and a space vector modulated matrix converter to control rotor current; the matrix converter-based rotor current control scheme is highlighted; the system enables optimal speed tracking for maximum energy capture from the wind and high performance active and reactive power regulation used the RST regulator. Lastly, the obtained simulation results, for different operating points, are presented illustrating the good control performances of the system

关键词： Matrix converters Wind turbines Induction generators Wind power generation Rotors Power generation economics Environmental economics Environmental factors Wind energy Renewable energy resources

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Optimization-based decomposition of a large-scale system

Optimization-based decomposition of a large-scale system

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1st IFAC Workshop on Applications of Large Scale Industrial Systems, ALSIS'06

作者： Rehák, Branislav Department of Control Engineering Faculty of Electrical Engineering Czech Technical University Technická 2 166 27 Praha 6 Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic P.O. Box 18 182 08 Prague Czech Republic

ISBN: (纸本)9783902661159

The problem of design of a controller for a large-scale system is studied. The design objective is to achieve behavior comparable with the standard controller that is LQ optimal. On the other hand the amount of interconnections between subsystems should be kept as small as possible. This is guaranteed by solving of an optimization problem where the number of interconnections is minimized while the difference in the values of the cost functional for the standard and decentralized controller is a constraint. To find the value of the cost of the decentralized control in presence of interconnections one can use linear matrix inequalities.

关键词： Linear matrix inequalities

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Design of verified logic control programs

Design of verified logic control programs

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IEEE International Conference on Computer-Aided Design

作者： Sven Lohmann Lan Anh Dinh Thi Olaf Stursberg Process Control Laboratory Department of Biochemical and Chemical Engineering University of Dortmund Dortmund Germany Institute of Automatic Control Engineering Department of Electrical Engineering and Information Technology Technical University Munich Munich Germany

To complement the largely manual design of logic control programs in industrial practice, this contribution proposes a method for systematically (and partly algorithmically) deriving logic controllers for given specifications. The main idea is to structure the information available for the design in form of specific intermediate formats which are iteratively refined and straightforwardly lead to controllers formulated as Sequential Function Charts. To analyze whether the design complies with all given specifications, model-based verification is applied subsequently, i.e. the controller is converted into timed automata, the latter are composed with a plant model, and model-checking algorithmically verifies (or falsifies) logic properties for the composed system. The procedure is described here for the example of a multi-product batch plant.

关键词： Logic design Automatic control Programmable control control systems Automata Algorithm design and analysis electrical equipment industry Industrial control Iterative algorithms Natural languages

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Symbolic Computation for Nonlinear Systems Using Quotients over Skew Polynomial Ring

Symbolic Computation for Nonlinear Systems Using Quotients o...

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Mediterranean Conference on control and automation (MED)

作者： Miroslav Halas Mikulas Huba Department of Automation and Control Faculty of Electrical Engineering and Information Technology Slovak University of Technology Bratislava Slovakia

Nonlinear control systems are more difficult to handle than linear, since the associativity is not valid. Laplace transforms and transfer functions, which form a symbolic computation for linear systems, are, therefore, disabled. A modern development of nonlinear control systems is thus related mainly to the systematic use of differential algebraic methods. However, such methods allow us to introduce similar symbolic computation also for nonlinear systems. To provide a basis for such a symbolic computation the theory of non-commutative polynomials over the field of meromorphic functions is introduced. In that respect, differential operators, which act on one-forms, play a key role. They form the left skew polynomial ring. Quotients of such polynomials stand for transfer functions of nonlinear systems. In other words, presented paper tries to show that there is no reason to believe well known dogma saying that nonlinear systems have no transfer functions

关键词： Nonlinear systems Polynomials Transfer functions Nonlinear control systems control systems Linear systems Algebra Switches automation Automatic control

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Implementation of Parameter Estimation in Mechanistic Models by Dynamic Optimization

Implementation of Parameter Estimation in Mechanistic Models...

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World Congress on Intelligent control and automation (WCICA)

作者： Xuemei Zhu Rucheng Liu Shuqing Wang College of Electrical and Automation Engineering Nanjing Normal University Nanjing Jiangsu China Institute of Advanced Process Control University of Zhejiang Hangzhou Zhejiang China

The main concern of this paper is the implementation of estimation of time-varying parameters in mechanistic models. A mechanistic model is always a set of nonlinear differential algebraic equations based on basic principles of physics, chemistry, biology etc. by writing down conservation or balance equations. These models usually involve parameters which are time-varying and must be estimated from experimental data or process data. The proposed parameter estimation approach is to minimize the discrepancy between the values of the measured and model simulated outputs. The dynamic optimization is employed due to the time-varying property of estimated parameters. The sequential quadratic programming and orthogonal collocation are used to solve the nonlinear dynamic optimization problem. The approach is verified on a pilot distillation column for estimating tray efficiencies of both the stripping and the rectifying sections and the feed composition

关键词： Parameter estimation Biological system modeling Differential algebraic equations Physics Chemistry Computational biology Writing Nonlinear equations Quadratic programming Dynamic programming

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Autotuning Autopilots for Micro-ROVs

Autotuning Autopilots for Micro-ROVs

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Mediterranean Conference on control and automation (MED)

作者： N. Miskovic Z. Vukic M. Barisic B. Tovornik Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering University of Zagreb Zagreb Croatia Faculty of Electrical Engineering and Computer Science Institute of Automation University of Maribor Maribor Slovenia

Underwater vehicles are highly nonlinear and complex systems, that makes designing autopilots extremely difficult. This paper presents autotuning as a method for tuning parameters of a micro-ROV autopilot. The main benefit of this procedure is that the model of the process does not have to be known. Autotuning is often used for industrial processes but not on marine vessels. This procedure, which is performed in closed-loop, is completely automated and enables the operator to retune an autopilot whenever ROV performance is degraded (due to different operating points, tether influence, currents, etc.). In this article we use already known different autotuning recommendations (primarily designed for type 0 processes) with some modifications which we recommend for micro-ROVs. We also give results of using different types of PID controllers, whose parameters are being tuned. A real life demonstration on a VideoRay Pro II micro-ROV is provided

关键词： Automatic control Underwater vehicles Payloads control systems Remotely operated vehicles Three-term control Nonlinear control systems Employee welfare control engineering computing Nonlinear systems

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DYNAMIC ANALYSIS AND control OF CHEMICAL AND BIOCHEMICAL REACTION NETWORKS

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IFAC Proceedings Volumes 2006年第2期39卷 165-170页

作者： Irene Otero-Muras Gábor Szederkényi Antonio A. Alonso Katalin M. Hangos Department of Process Engineering IIM-CSIC Eduardo Cabello 6 36208 Vigo Spain Process Control Research Group Computer and Automation Research Institute H-1518 Budapest P.O.Box 63 Hungary

Metabolic or cell signalling pathways are examples of biochemical networks exhibiting possible complex dynamics in the form of steady-state multiplicity, sustained oscillations or even deterministic chaos. The origin of these nonlinear phenomena is not always well understood, nor it can be systematically predicted beyond a case by case basis. Despite considerable progress in dynamic aspects, efforts are still needed to develop efficient and robust methods of stabilization and control of reaction networks. In this work, we combine concepts and tools from irreversible thermodynamics and systems theory to explore the underlying dynamic properties of a general class of chemical and biochemical networks. Lyapunov and passivity based methods are given for the systematic design of globally stabilizing feedback controllers in both the concentration space and a novel minimal description of the kinetic networks dynamics: the reaction space.

关键词： biochemical reaction networks passivity nonlinear control entropy

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NN control of discrete-time MIMO systems with input delay

NN control of discrete-time MIMO systems with input delay

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American control Conference (ACC)

作者： Jin Zhang Shuling Dai Department of Automatic Control School of Automation Science and Electrical Engineering Beijing Aeronautics and Astronautics University Beijing China

In this paper, adaptive neural network (NN) control scheme is investigated for classes of discrete-time multi inputs multi outputs (MIMO) nonlinear systems with known input delay and triangular form inputs. By recursive substitution, the original system is transformed into an input-output based predictor model with the triangular form inputs structure unchanged. Neural networks are used to approximate the desired controls which can realize exact tracking. The closed loop system is proved to be semi-globally uniformly ultimately bounded (SGUUB) by using Lyapunov synthesis method

关键词： Neural networks control systems MIMO Delay systems Adaptive systems Programmable control Adaptive control Nonlinear control systems Nonlinear systems Predictive models

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Selective Harmonic Elimination in Multi-Modules Three-Phase Current-Source Converters

Selective Harmonic Elimination in Multi-Modules Three-Phase ...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Johan I. Guzman Jose R. Espinoza Navid R. Zargari Luis A. Moran Department of Electrical Engineering Concepcion University Concepcion Chile Rockwell Automation Canada Control System Cambridge ONT Canada

Modular current source converters (MCSC) can enhance the current capacity and improve the power quality at medium voltage PWM motor drives. A MCSC uses individual three-phase modules in a shunt connection to share the total power in a symmetrical manner. The modulation of these units is normally done using optimized patterns as selective harmonic elimination (SHE). However, the optimization is usually performed at each module. This paper proposes a modulating technique that optimizes the operation of a MCSC built up of P modules. Thus, for the same switching frequency, P times the number of harmonics are removed from the injected ac current as compared to the regular approach. A complete mathematical formulation as well as experimental results validate the theoretical considerations

关键词： Pulse width modulation Pulse width modulation converters Medium voltage Topology Switching frequency Power harmonic filters Power semiconductor switches Pulse width modulation inverters Space vector pulse width modulation Power system harmonics

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Modeling Issues in Three-Phase Current Source Rectifiers that use Damping Resistors

Modeling Issues in Three-Phase Current Source Rectifiers tha...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Pedro E. Melin Jose R. Espinoza Navid R. Zargari Miguel A. Sanchez Johan I. Guzman Department of Electrical Engineering Concepcion University Concepcion Chile Rockwell Automation Canada Control System Cambridge ONT Canada

The model of a three-phase current source rectifier (CSR) is a complex mathematical representation as it is nonlinear, multi-variable, and coupled. In order to work with a simplified but still accurate model, a representation in a rotating reference frame dq0 in combination with an average model are normally used. The result is a model that operates with ripple free inputs, outputs, and state variables that should be the accurate average value of the actual variables. However, the average model of these topologies could lead to errors if damping resistors are used. A case study shows as much as 10% error in the DC link current between the actual value and the predicted by the average model. This paper finds and shows systematically the source of the error and proposes a method for the accurate average modeling of CSRs with damping resistors. Simulated results show the validity of the theoretical considerations

关键词： Rectifiers Damping Resistors Mathematical model Power harmonic filters Power system modeling Voltage Topology Pulse width modulation Resonant frequency

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