EPE Association: EPE 2001 - Topic 04a: Optimal Control, Robust Control, Non-Linear Control

EPE 2001 - Topic 04a: Optimal Control, Robust Control, Non-Linear Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 04: APPLICATION OF CONTROL METHODS TO ELECTRICAL SYSTEMS > EPE 2001 - Topic 04a: Optimal Control, Robust Control, Non-Linear Control

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   Anti-windup Circuits with On-line Optimisation by Genetic Algorithm
By W.G. da Silva; P.P. Acarnley; J.W.Finch [View]
[Download]

Abstract: This work presents a study of some commonly used anti-windup circuits for use with proportionalintegral speed controllers for drive application in the presence of load disturbance. Optimisation of the controller parameters and the anti-windup settings is achieved on-line using a genetic algorithm. Experimental results are presented to illustrate the efficiency of each anti-windup circuit.

   Discrete Sliding Mode Control of a DC-AC Boost Converter
By J. Matas Alcalá; L. Garciá de Vicuña; O. López Lapeña [View]
[Download]

Abstract: This paper proposes the design of a discrete sliding control of a boost dc-ac converter. The sliding control surfaces are designed by imposing a desired dynamic behavior on the system, which allows us to determine the main parameters of the sliding mode controller, and is specially interesting in tracking problems. This procedure leads to a discrete-time switching surfaces, which provide robustness with regard to external disturbances, and a good dynamic response of the output voltage.

   Energy Efficient Self-Adj. Speed Controller for Ind. DC Motor Drives
By A.M.Sharaf ; S.I. Abu-Azab [View]
[Download]

Abstract: The paper presents a novel self adjusting speed (SAC) controller comprising two dynamic error regulation loops (speed and power) to ensure effective speed reference tracking as well as power/energy conservation for common cyclical loads driven by industrial large DC motor drives.

   Generalised model for robustness analysis of FOC induction machines
By E. Laroche; Y. Bonnassieux; H. Abou-Kandil; J.P. Louis [View]
[Download]

Abstract: A model is presented in this paper allowing robustness evaluation via µ-analysis of systems including induction motors with flux oriented control (FOC). The system considered is composed of an induction motor connected to a mechanical load via a flexible joint. Parameter uncertainties are simultaneously considered on both electric and mechanical parts. The model of flux oriented controlled induction machine, accounting for parameter errors, is developed and transformed in a shape ad-hoc for robustness analysis. µ-analysis background is presented and results are given in the case of a controller designed with H∞ “loop-shaping” method.

   Input-Output Linearisation based Sliding Mode for IM Control using Sliding Mode Flux Observer
By A. Benchaib; C. Edwards [View]
[Download]

Abstract: This paper proposes a new scheme for induction motor control. The controller is based on input- output linearisation and sliding mode techniques. Stator currents are derived using input-output linearisation methods to ensure speed and ßux tracking. Thereafter, stator voltages are designed which seek to provide stator current tracking using sliding mode ideas. The control scheme as- sumes that only the motor speed and stator currents are measured and the observer estimates the unmeasured ßux components. Some simulation results are given to show the performances of the scheme.

   Insensible Control To Parameter Variation Apllied To Induction Motor: a reference model approach
By S. Cauët; L. Rambault; E. Etien; G. Champenois [View]
[Download]

Abstract: A linearized feedback system with a reference model is designed for an induction motor. The use of a reference model enables the nearly decoupling between the rotor speed and the rotor flux modulus which yields the independence of their dynamics with respect to resistance and inductance deviations. An experimental comparison test is carried out.

   Linearization and Hinf controller applied to an Induction Motor
By L. Rambault; C. Chaigne; G. Champenois; S. Cauet [View]
[Download]

Abstract: After the input-output feedback linearization applied to an induction motor, this paper detail how to design a H‡ controller to control the rotor speed and the rotor flux modulus. This method use filters to translate some specifications to the synthesis work. Some experimental results are carried out.

   Near Time Optimal Position Control of El.Drives with Reluctance Motor
By J. Vittek; S. J. Dodds [View]
[Download]

Abstract: A new approach for the position control of electrical drives with reluctance synchronous motors is presented. The principles of time optimal control and forced dynamic control are combined to form a nearly time optimal position control performance in drives equipped with controllers enabling close following of time varying reference position inputs. The position response of a real time model of the closed-loop time optimal control system provides the reference input to the drive control loop. The method is applied here to reluctance synchronous motor with speed control loops based on forced dynamic. Simulation results confirm the near time optimal performance.

   Optimal State Feedback Control of a Vector Controlled Current Source R
By A. Kloenne; F. W. Fuchs [View]
[Download]

Abstract: Pulsewidth modulated current source rectifiers find their application in three phase current source power converters for variable speed drives. Special attention has to be given to the control at the line side because of the LC-Filter with low damping constant. This investigation firstly reports the design and analysis of the multivariable optimal state feedback control for the current source rectifier. Here the dc link is equipped with an ohmic load. In optimal control, the control strategy is sought that gives the best trade-off between performance and cost of control. High stability and robustness against parameter changes are two important advantages of optimal control. The line side rectifier has been modelled within the separated d-q-frame. The proposed method enables the independent control of the active and reactive component of the supply current vector. A performance index with quadratic weighting is chosen so that a stable operational behaviour and small resonances at the mains are achieved. The model of the system with multivariable optimal state feedback control was investigated in simulations with varying weighting parameters for stationary and dynamic behaviour. Finally, the control has been implemented in a DSP-system and FPGA-kit. Experimental results are presented to a 22 kW converter test bench.

   real time induction motor drive using sliding mode linearization
By E. Etien; L. Rambault; S. Cauët; G. Champenois [View]
[Download]

Abstract: In variable speed domain, many applications need high performances in term of torque and accuracy. To obtain high performances, several control methods have been developed few years ago. The variable structures of control methods were developed principally in Russia since 1950. Sliding mode theory has been used for Induction Motor (I.M) drive for a long time [1]. Introduce as a relative easier control design, sliding mode using switched control produces chattering phenomena and torque perturbations. Also, many solutions try to limit those drawbacks by using smoothed nonlinearities. In an other hand, many methods of non linear system control have been developed like linearization, backstepping [2] , [3]. This paper shows the utilization of sliding mode theory, well known by speed drive conceptors, in order to linearize the I.M behavior. Continuous feedbacks are designed to limit the chattering problem and a model based approach is used to impose motor state trajectories in despite of parameter variations.

   Robust Fuzzy-Sliding Mode Control for Motor Drives.
By J. Arellano-Padilla; G. M. Asher; M. Sumner [View]
[Download]

Abstract: This paper reviews and develops a new approach to Fuzzy Sliding Mode Control (FSMC) for the robust speed control of practical motor drives systems. Robustness is achieved through the definition of real time reference transient trajectory for the SMC switching function. This trajectory error is the input for a fuzzy interpolation between control laws corresponding to the boundary values of the plant parameters. The paper reviews the background of the approach and develops design procedures for the fuzzy interpolation and membership values to yield robust performance for a very large range of parameter variations and hence requiring little or no knowledge of the load by a commissioning engineer. Experimental results using a Vector Controlled Induction Machines (VCIM) for both drive and dynamometer are presented.

   Supervisory Control of Multiple AC Motors Coupled Through Rigid Shaft
By Z. Nowacki; S. Sikora; A. Jezierski [View]
[Download]

Abstract: The important problem in the multiple AC motors coupled through mechanical stiff shaft drives is non-uniform load distribution. This article introduces the structure of laboratory model of AC multi-motor drive system along with its supervising control unit. The results of laboratory and simulation tests are presented.

   Use of Co-simulation in the Design of Control Devices for Static Converters
By R. Ruelland; G. Gateau; J.C. Hapiot [View]
[Download]

Abstract: A new stage called co-simulation in the design cycle of the control devices dedicated to power electronics applications is proposed. In a first part, the interest of this new stage and the establishment of a cosimulation environment is explained. Then, the co-simulation environment is used in the design and the implementation of a non-linear control for multi-cell converter.

   Wide Bandwidth Single and Three-phase PLL Structures
By S. Magalhães Silva; L. Neto Arruda; B. J. Cardoso Filho [View]
[Download]

Abstract: Phase-locked Loop (PLL) systems have been widely used in many applications involving automatic control, such as communications, instrumentation and electric drives. This paper presents a detailed study of a PLL structure for three-phase grid-tied systems. Its operation under utility distorted conditions is analyzed, as well as its ability to give quasi-instantaneous information of phase, frequency and amplitude of the utility voltages. Additionally, a new PLL structure for single-phase systems is introduced. This new PLL is compared with the conventional zero-crossing PLL type. Small signal models and dynamic stiffness characteristics for the PLL's are presented. Experimental results from a DSP-based system are included to support the theoretical analysis.

EPE 2001 - Topic 04a: Optimal Control, Robust Control, Non-Linear Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 04: APPLICATION OF CONTROL METHODS TO ELECTRICAL SYSTEMS > EPE 2001 - Topic 04a: Optimal Control, Robust Control, Non-Linear Control
	[return to parent folder]

	Anti-windup Circuits with On-line Optimisation by Genetic Algorithm By W.G. da Silva; P.P. Acarnley; J.W.Finch	[View] [Download]
Abstract: This work presents a study of some commonly used anti-windup circuits for use with proportionalintegral speed controllers for drive application in the presence of load disturbance. Optimisation of the controller parameters and the anti-windup settings is achieved on-line using a genetic algorithm. Experimental results are presented to illustrate the efficiency of each anti-windup circuit.

	Discrete Sliding Mode Control of a DC-AC Boost Converter By J. Matas Alcalá; L. Garciá de Vicuña; O. López Lapeña	[View] [Download]
Abstract: This paper proposes the design of a discrete sliding control of a boost dc-ac converter. The sliding control surfaces are designed by imposing a desired dynamic behavior on the system, which allows us to determine the main parameters of the sliding mode controller, and is specially interesting in tracking problems. This procedure leads to a discrete-time switching surfaces, which provide robustness with regard to external disturbances, and a good dynamic response of the output voltage.

	Energy Efficient Self-Adj. Speed Controller for Ind. DC Motor Drives By A.M.Sharaf ; S.I. Abu-Azab	[View] [Download]
Abstract: The paper presents a novel self adjusting speed (SAC) controller comprising two dynamic error regulation loops (speed and power) to ensure effective speed reference tracking as well as power/energy conservation for common cyclical loads driven by industrial large DC motor drives.

	Generalised model for robustness analysis of FOC induction machines By E. Laroche; Y. Bonnassieux; H. Abou-Kandil; J.P. Louis	[View] [Download]
Abstract: A model is presented in this paper allowing robustness evaluation via µ-analysis of systems including induction motors with flux oriented control (FOC). The system considered is composed of an induction motor connected to a mechanical load via a flexible joint. Parameter uncertainties are simultaneously considered on both electric and mechanical parts. The model of flux oriented controlled induction machine, accounting for parameter errors, is developed and transformed in a shape ad-hoc for robustness analysis. µ-analysis background is presented and results are given in the case of a controller designed with H∞ “loop-shaping” method.

	Input-Output Linearisation based Sliding Mode for IM Control using Sliding Mode Flux Observer By A. Benchaib; C. Edwards	[View] [Download]
Abstract: This paper proposes a new scheme for induction motor control. The controller is based on input- output linearisation and sliding mode techniques. Stator currents are derived using input-output linearisation methods to ensure speed and ßux tracking. Thereafter, stator voltages are designed which seek to provide stator current tracking using sliding mode ideas. The control scheme as- sumes that only the motor speed and stator currents are measured and the observer estimates the unmeasured ßux components. Some simulation results are given to show the performances of the scheme.

	Insensible Control To Parameter Variation Apllied To Induction Motor: a reference model approach By S. Cauët; L. Rambault; E. Etien; G. Champenois	[View] [Download]
Abstract: A linearized feedback system with a reference model is designed for an induction motor. The use of a reference model enables the nearly decoupling between the rotor speed and the rotor flux modulus which yields the independence of their dynamics with respect to resistance and inductance deviations. An experimental comparison test is carried out.

	Linearization and Hinf controller applied to an Induction Motor By L. Rambault; C. Chaigne; G. Champenois; S. Cauet	[View] [Download]
Abstract: After the input-output feedback linearization applied to an induction motor, this paper detail how to design a H‡ controller to control the rotor speed and the rotor flux modulus. This method use filters to translate some specifications to the synthesis work. Some experimental results are carried out.

	Near Time Optimal Position Control of El.Drives with Reluctance Motor By J. Vittek; S. J. Dodds	[View] [Download]
Abstract: A new approach for the position control of electrical drives with reluctance synchronous motors is presented. The principles of time optimal control and forced dynamic control are combined to form a nearly time optimal position control performance in drives equipped with controllers enabling close following of time varying reference position inputs. The position response of a real time model of the closed-loop time optimal control system provides the reference input to the drive control loop. The method is applied here to reluctance synchronous motor with speed control loops based on forced dynamic. Simulation results confirm the near time optimal performance.

	Optimal State Feedback Control of a Vector Controlled Current Source R By A. Kloenne; F. W. Fuchs	[View] [Download]
Abstract: Pulsewidth modulated current source rectifiers find their application in three phase current source power converters for variable speed drives. Special attention has to be given to the control at the line side because of the LC-Filter with low damping constant. This investigation firstly reports the design and analysis of the multivariable optimal state feedback control for the current source rectifier. Here the dc link is equipped with an ohmic load. In optimal control, the control strategy is sought that gives the best trade-off between performance and cost of control. High stability and robustness against parameter changes are two important advantages of optimal control. The line side rectifier has been modelled within the separated d-q-frame. The proposed method enables the independent control of the active and reactive component of the supply current vector. A performance index with quadratic weighting is chosen so that a stable operational behaviour and small resonances at the mains are achieved. The model of the system with multivariable optimal state feedback control was investigated in simulations with varying weighting parameters for stationary and dynamic behaviour. Finally, the control has been implemented in a DSP-system and FPGA-kit. Experimental results are presented to a 22 kW converter test bench.

	real time induction motor drive using sliding mode linearization By E. Etien; L. Rambault; S. Cauët; G. Champenois	[View] [Download]
Abstract: In variable speed domain, many applications need high performances in term of torque and accuracy. To obtain high performances, several control methods have been developed few years ago. The variable structures of control methods were developed principally in Russia since 1950. Sliding mode theory has been used for Induction Motor (I.M) drive for a long time [1]. Introduce as a relative easier control design, sliding mode using switched control produces chattering phenomena and torque perturbations. Also, many solutions try to limit those drawbacks by using smoothed nonlinearities. In an other hand, many methods of non linear system control have been developed like linearization, backstepping [2] , [3]. This paper shows the utilization of sliding mode theory, well known by speed drive conceptors, in order to linearize the I.M behavior. Continuous feedbacks are designed to limit the chattering problem and a model based approach is used to impose motor state trajectories in despite of parameter variations.

	Robust Fuzzy-Sliding Mode Control for Motor Drives. By J. Arellano-Padilla; G. M. Asher; M. Sumner	[View] [Download]
Abstract: This paper reviews and develops a new approach to Fuzzy Sliding Mode Control (FSMC) for the robust speed control of practical motor drives systems. Robustness is achieved through the definition of real time reference transient trajectory for the SMC switching function. This trajectory error is the input for a fuzzy interpolation between control laws corresponding to the boundary values of the plant parameters. The paper reviews the background of the approach and develops design procedures for the fuzzy interpolation and membership values to yield robust performance for a very large range of parameter variations and hence requiring little or no knowledge of the load by a commissioning engineer. Experimental results using a Vector Controlled Induction Machines (VCIM) for both drive and dynamometer are presented.

	Supervisory Control of Multiple AC Motors Coupled Through Rigid Shaft By Z. Nowacki; S. Sikora; A. Jezierski	[View] [Download]
Abstract: The important problem in the multiple AC motors coupled through mechanical stiff shaft drives is non-uniform load distribution. This article introduces the structure of laboratory model of AC multi-motor drive system along with its supervising control unit. The results of laboratory and simulation tests are presented.

	Use of Co-simulation in the Design of Control Devices for Static Converters By R. Ruelland; G. Gateau; J.C. Hapiot	[View] [Download]
Abstract: A new stage called co-simulation in the design cycle of the control devices dedicated to power electronics applications is proposed. In a first part, the interest of this new stage and the establishment of a cosimulation environment is explained. Then, the co-simulation environment is used in the design and the implementation of a non-linear control for multi-cell converter.

	Wide Bandwidth Single and Three-phase PLL Structures By S. Magalhães Silva; L. Neto Arruda; B. J. Cardoso Filho	[View] [Download]
Abstract: Phase-locked Loop (PLL) systems have been widely used in many applications involving automatic control, such as communications, instrumentation and electric drives. This paper presents a detailed study of a PLL structure for three-phase grid-tied systems. Its operation under utility distorted conditions is analyzed, as well as its ability to give quasi-instantaneous information of phase, frequency and amplitude of the utility voltages. Additionally, a new PLL structure for single-phase systems is introduced. This new PLL is compared with the conventional zero-crossing PLL type. Small signal models and dynamic stiffness characteristics for the PLL's are presented. Experimental results from a DSP-based system are included to support the theoretical analysis.