EPE Association: EPE 1989 - 31 - Dialogue Session 1.4: FIELD ORIENTATION

EPE 1989 - 31 - Dialogue Session 1.4: FIELD ORIENTATION
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   FIELD ORIENTED CONTROL OF ASYNCHRONOUS MACHINES BY SYSTEM INVERSION
By C. Tuttas [View]
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Abstract: The field oriented control of an asynchronous machine is usually explained by using state phasor transformation. This paper shows that by system inversion it is also possible to obtain field oriented control schemes. There are presented three different types of speed controllers, working with impressed stator currents, impressed stator fluxes and impressed stator voltages. The relations between other known control concepts are pointed out.

   FIELD-ORIENTATED INDUCTION MOTOR DRIVES: PROGRESS
By J. W. Finch; P. P. Acarnley; D. J. Atkinson [View]
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Abstract: The work reported forms part of a programme of research at Newcastle into field orientated control of ac drives. The philosophy of possible control schemes is reviewed. One major aim of this research is to apply modern control theory to such drives, and to greatly improve the practical application of such schemes. A comprehensive 32 bit microprocessor based data acquisition, computation and control system is described. A versitile simulation facility has been developed, and examples of its use are presented.

   PARAMETER IDENTIFICATION TECHNIQUES FOR INDUCTION MOTOR DRIVES
By D. J. Atkinson; P. P. Acarnley; J. W. Finch [View]
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Abstract: The Kalman Filter (KF) in its basic form is a state estimator and can be applied to the direct field orientation problem. The paper shows how this filter combines information from the plant model with output measurements to produce an optimal estimate of the unmeasured states. Simulation results for the KF used as a rotor current state estimator are presented and indicate how the filter could be used in a direct vector control system. As the KF can deal with a time varying linear plant model, then the rotor current can be estimated while the rotor speed is varying. lt is shown that the extended Kalman filter (EKF) overcomes the unmeasureable rotor state problem by providing simultaneous state and parameter estimates, using linearisation about the most recent estimate. Simulation results for rotor current / rotor resistance estimation are presented. The extended Kalman filter should always be used with caution as divergence may occur if the assumptions required for the linearisation process are not upheld in the application.

   DIGITAL VOLTAGE VECTOR CONTROL WITH ADAPTIVE PARAMETER TUNING
By Poul Erik Nielsen; Erhard Chr. Thomsen; Michael Tonnes Nielsen [View]
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Abstract: This paper describes a completely digital control system for standard induction motors. A new inverter voltage vector control system for high frequency switching has been designed and a predictive frequency-voltage control system that eliminates the need of tacho feedback has been developed. In addition, an adaptive parameter tuning method has been developed. This method takes the large variation in electrical parameters of standard induction motors of different manufactures into account. For control purposes, switch protection and switch loss minimizing, custom designed integrated circuits have been used extensively . Steady-state and dynamic performances of the drive are documented.

   FIELD-ORIENTED SPEED CONTROL SYSTEM BASED ON A SINE-WAVE CURRENT CONVERTER
By R. Marschalko: A. Kelemen; Maria lmecs [View]
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Abstract: The paper refers particulary to a vector-controlled, sine-wave current converter fed induction motor drive system. The essential novelty consists in an original application of the vector-control principle. The magnetic flux in the air-gap is identified by means of the motor model, in a stator current oriented feedback loop. A control loop, oriented according to the magnetic flux in the air-gap was adopted, in order to determine the manipulated variables which control the power electronic converter. So, a vector-control system, in agreement with the converter and the identification part of the system was obtained. The paper presents the detailed field-oriented speed control system. The induction motor state identification is analysed, the rotor speed and phase currents measurements being discussed through the adequate test loops and digital recording programmes. The paper presents the strategies used for the motor acceleration and reversing regime too. The results refer to the dynamic behaviour of the drive system.

   PHASOR APPLIED CONTROL OF INDUCTION MOTORS - AN ECONOMIC CONCEPT FOR HIGH QUALITY MOTOR DRIVES
By A. K. Adnanes; T. M. Undeland; O. M. Stangvik [View]
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Abstract: A new method for control of induction motors is presented and analyzed. An induction motor drive with this Phasor Applied Control (PAC) algorithm is realized and tested. The theoretical and experimental results show good stationary and dynamic performances. PAC uses three motor parameters in the algorithmes, which might as an first and very good approximation be calculated from the information found on the nameplate of the machine. For improved dynamic performance, these parameters should be calculated from more exact machine data, and in special applications, adapted on-line. The PAC algorithm is simple and easy to understand, but robust, and may very well be implemented in a standard microcontroller.

EPE 1989 - 31 - Dialogue Session 1.4: FIELD ORIENTATION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 31 - Dialogue Session 1.4: FIELD ORIENTATION
	[return to parent folder]

	FIELD ORIENTED CONTROL OF ASYNCHRONOUS MACHINES BY SYSTEM INVERSION By C. Tuttas	[View] [Download]
Abstract: The field oriented control of an asynchronous machine is usually explained by using state phasor transformation. This paper shows that by system inversion it is also possible to obtain field oriented control schemes. There are presented three different types of speed controllers, working with impressed stator currents, impressed stator fluxes and impressed stator voltages. The relations between other known control concepts are pointed out.

	FIELD-ORIENTATED INDUCTION MOTOR DRIVES: PROGRESS By J. W. Finch; P. P. Acarnley; D. J. Atkinson	[View] [Download]
Abstract: The work reported forms part of a programme of research at Newcastle into field orientated control of ac drives. The philosophy of possible control schemes is reviewed. One major aim of this research is to apply modern control theory to such drives, and to greatly improve the practical application of such schemes. A comprehensive 32 bit microprocessor based data acquisition, computation and control system is described. A versitile simulation facility has been developed, and examples of its use are presented.

	PARAMETER IDENTIFICATION TECHNIQUES FOR INDUCTION MOTOR DRIVES By D. J. Atkinson; P. P. Acarnley; J. W. Finch	[View] [Download]
Abstract: The Kalman Filter (KF) in its basic form is a state estimator and can be applied to the direct field orientation problem. The paper shows how this filter combines information from the plant model with output measurements to produce an optimal estimate of the unmeasured states. Simulation results for the KF used as a rotor current state estimator are presented and indicate how the filter could be used in a direct vector control system. As the KF can deal with a time varying linear plant model, then the rotor current can be estimated while the rotor speed is varying. lt is shown that the extended Kalman filter (EKF) overcomes the unmeasureable rotor state problem by providing simultaneous state and parameter estimates, using linearisation about the most recent estimate. Simulation results for rotor current / rotor resistance estimation are presented. The extended Kalman filter should always be used with caution as divergence may occur if the assumptions required for the linearisation process are not upheld in the application.

	DIGITAL VOLTAGE VECTOR CONTROL WITH ADAPTIVE PARAMETER TUNING By Poul Erik Nielsen; Erhard Chr. Thomsen; Michael Tonnes Nielsen	[View] [Download]
Abstract: This paper describes a completely digital control system for standard induction motors. A new inverter voltage vector control system for high frequency switching has been designed and a predictive frequency-voltage control system that eliminates the need of tacho feedback has been developed. In addition, an adaptive parameter tuning method has been developed. This method takes the large variation in electrical parameters of standard induction motors of different manufactures into account. For control purposes, switch protection and switch loss minimizing, custom designed integrated circuits have been used extensively . Steady-state and dynamic performances of the drive are documented.

	FIELD-ORIENTED SPEED CONTROL SYSTEM BASED ON A SINE-WAVE CURRENT CONVERTER By R. Marschalko: A. Kelemen; Maria lmecs	[View] [Download]
Abstract: The paper refers particulary to a vector-controlled, sine-wave current converter fed induction motor drive system. The essential novelty consists in an original application of the vector-control principle. The magnetic flux in the air-gap is identified by means of the motor model, in a stator current oriented feedback loop. A control loop, oriented according to the magnetic flux in the air-gap was adopted, in order to determine the manipulated variables which control the power electronic converter. So, a vector-control system, in agreement with the converter and the identification part of the system was obtained. The paper presents the detailed field-oriented speed control system. The induction motor state identification is analysed, the rotor speed and phase currents measurements being discussed through the adequate test loops and digital recording programmes. The paper presents the strategies used for the motor acceleration and reversing regime too. The results refer to the dynamic behaviour of the drive system.

	PHASOR APPLIED CONTROL OF INDUCTION MOTORS - AN ECONOMIC CONCEPT FOR HIGH QUALITY MOTOR DRIVES By A. K. Adnanes; T. M. Undeland; O. M. Stangvik	[View] [Download]
Abstract: A new method for control of induction motors is presented and analyzed. An induction motor drive with this Phasor Applied Control (PAC) algorithm is realized and tested. The theoretical and experimental results show good stationary and dynamic performances. PAC uses three motor parameters in the algorithmes, which might as an first and very good approximation be calculated from the information found on the nameplate of the machine. For improved dynamic performance, these parameters should be calculated from more exact machine data, and in special applications, adapted on-line. The PAC algorithm is simple and easy to understand, but robust, and may very well be implemented in a standard microcontroller.