EPE Association: NORpie 2002 - Topic 08: CONTROL OF INDUCTION MOTORS

NORpie 2002 - Topic 08: CONTROL OF INDUCTION MOTORS
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   Zero-Speed Operation of Sensorless Induction Motors Using Full-Order Flux Observer
By M. Hinkkanen; J. Luomi [View]
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Abstract: This paper deals with the flux estimation for sensorless induction motor drives. Stable zero-speed operation is achieved by using a speed-adaptive full-order flux observer and a simple software compensation of of inverter nonlinearities. No voltage feedback is needed for the compensation and hardware costs can be lowered. Experimental results including stable zero-speed operation are shown.

   Feedforward Synchronised PWM for Adjustable Speed AC Drives with Different Control Modes
By V. Oleschuk; F. Blaabjerg; F. Buus Jensen [View]
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Abstract: This paper presents a novel method of direct synchronised pulsewidth modulation (PWM) for three-phase voltage source inverters, feeding induction motors with different control regimes. It is based on the universal algorithm with either simplified algebraic or accurate trigonometric control functions, with vector approach for determination of the pulse patterns. Different control modes of the drive systems with synchronised PWM, including standard scalar V/F control, and also V²/F = constant and V/F² = constant control regimes, have been analysed in the paper. Simulations give the behavior of the PWM techniques proposed. Both continuous and discontinuous schemes of synchronised PWM, applied for the corresponding control regime, have been analysed and compared.

   Voltage Sag Ride-Through Control for Induction Motor Drives
By K. Pietiläinen, M. Jansson; L. Harnefors [View]
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Abstract: In this paper, the voltage sag ride-through capabilities of the torque-maximizing control scheme for induction motor (IM) drives proposed in [1] are investigated. The results are verified experimentally. The paper also shows the benefits compared to an ordinary controller, i.e., a controller without the ride-through algorithm. The proposed field-weakening scheme will improve voltage sag ride-through capability significantly.

   A Tracking Controller for a Speed Sensorless Induction Machine Drive
By V. M. Leppänen; J. Luomi [View]
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Abstract: A speed sensorless controller structure for tracking the rotor flux orientation of an induction motor down to zero speed and frequency is introduced. The controller is based on the fundamental-wave motor model, which is augmented with the equation of mechanical motion. A low-frequency AC test signal is superimposed on the stator current of the motor. The response in the stator voltage to this signal depends on the orientation of the signal relative to that of the rotor flux. This dependency is used to control the orientation error to zero. Derivation of the controller structure is given, and simulation results validating the approach are shown.

   Design and Analysis of Inherently Sensorless Rotor-Flux-Oriented Vector Control System
By R. Ottersten; L. Harnefors [View]
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Abstract: Reduced-order observers for rotor flux estimation of induction machines are considered. Only observers that do not u!se the rotor speed in their equations are studied (inherently sensorless schemes). An observer, which significantly improves the damping of the traditional "voltage model", is presented. It is shown that the flux dynamics form a nonlinear closed-loop system when the flux estimate is used for field orientation, and instability at low speeds is indicated.

NORpie 2002 - Topic 08: CONTROL OF INDUCTION MOTORS
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2002 > NORpie 2002 - Topic 08: CONTROL OF INDUCTION MOTORS
	[return to parent folder]

	Zero-Speed Operation of Sensorless Induction Motors Using Full-Order Flux Observer By M. Hinkkanen; J. Luomi	[View] [Download]
Abstract: This paper deals with the flux estimation for sensorless induction motor drives. Stable zero-speed operation is achieved by using a speed-adaptive full-order flux observer and a simple software compensation of of inverter nonlinearities. No voltage feedback is needed for the compensation and hardware costs can be lowered. Experimental results including stable zero-speed operation are shown.

	Feedforward Synchronised PWM for Adjustable Speed AC Drives with Different Control Modes By V. Oleschuk; F. Blaabjerg; F. Buus Jensen	[View] [Download]
Abstract: This paper presents a novel method of direct synchronised pulsewidth modulation (PWM) for three-phase voltage source inverters, feeding induction motors with different control regimes. It is based on the universal algorithm with either simplified algebraic or accurate trigonometric control functions, with vector approach for determination of the pulse patterns. Different control modes of the drive systems with synchronised PWM, including standard scalar V/F control, and also V²/F = constant and V/F² = constant control regimes, have been analysed in the paper. Simulations give the behavior of the PWM techniques proposed. Both continuous and discontinuous schemes of synchronised PWM, applied for the corresponding control regime, have been analysed and compared.

	Voltage Sag Ride-Through Control for Induction Motor Drives By K. Pietiläinen, M. Jansson; L. Harnefors	[View] [Download]
Abstract: In this paper, the voltage sag ride-through capabilities of the torque-maximizing control scheme for induction motor (IM) drives proposed in [1] are investigated. The results are verified experimentally. The paper also shows the benefits compared to an ordinary controller, i.e., a controller without the ride-through algorithm. The proposed field-weakening scheme will improve voltage sag ride-through capability significantly.

	A Tracking Controller for a Speed Sensorless Induction Machine Drive By V. M. Leppänen; J. Luomi	[View] [Download]
Abstract: A speed sensorless controller structure for tracking the rotor flux orientation of an induction motor down to zero speed and frequency is introduced. The controller is based on the fundamental-wave motor model, which is augmented with the equation of mechanical motion. A low-frequency AC test signal is superimposed on the stator current of the motor. The response in the stator voltage to this signal depends on the orientation of the signal relative to that of the rotor flux. This dependency is used to control the orientation error to zero. Derivation of the controller structure is given, and simulation results validating the approach are shown.

	Design and Analysis of Inherently Sensorless Rotor-Flux-Oriented Vector Control System By R. Ottersten; L. Harnefors	[View] [Download]
Abstract: Reduced-order observers for rotor flux estimation of induction machines are considered. Only observers that do not u!se the rotor speed in their equations are studied (inherently sensorless schemes). An observer, which significantly improves the damping of the traditional "voltage model", is presented. It is shown that the flux dynamics form a nonlinear closed-loop system when the flux estimate is used for field orientation, and instability at low speeds is indicated.