EPE Association: EPE 1987 - 23 - Lecture Session 3.5: INDUCTION MOTOR DRIVES (II)

EPE 1987 - 23 - Lecture Session 3.5: INDUCTION MOTOR DRIVES (II)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 23 - Lecture Session 3.5: INDUCTION MOTOR DRIVES (II)

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   MICROPROCESSOR CONTROL OF A DOUBLE-FED AC MACHINE WITH A VOLTAGE SOURCE GTO INVERTER IN THE ROTOR CIRCUIT
By D. Arsudis [View]
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Abstract: This paper deals with the control of a wound rotor induction machine, with the stator being connected to the constant frequency line and the rotor fed by a voltage source GTO inverter. Applying field orientation a variable speed generator is obtained, with a decoupled control of stator active and reactive power even during transient operation. All control tasks as well as the modulation of the inverter are carried out by a single 16-bit microprocessor. Feeding almost sinusoidal rotor currents, the variable frequency grid harmonics can be nearly eliminated.

   SIMPLE LOAD-ANGLE CONTROL METHOD FOR INDUCTION MACHINES FED BY CURRENT SOURCE INVERTERS
By D. Horstmann; A. Tarsoly [View]
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Abstract: In this paper a simple field orientated control method for induction machines fed by current source inverters is presented. The method is based on a feed forward control of the rotor frequency. A load-angle control circuit is added, which ensures by means of a fundamental frequency model that the necessary mean load-angle is suppIied to the induction machine. The dc-link current and the drive's speed are measured and used as inputs to the model. For sufficiently high speeds the control operates in the well known fundamental switching mode. In the lower frequency range the feed forward inverter control, which is subordinated to the closed loop control, generates a pulse pattern, synchronized to the fundamental frequency of the current, to reduce torque pulsations of low order. A free running mode of operation is performed in the range of even lower frequencies down to zero, where also a special shaping of the dc-link current is applied. The control is executed in a microcomputer system. The steady state and dynamic behaviour of the drive are demonstrated by virtue of measurements on a test stand in both the pulsing and in the fundamental switching mode.

   ON THE MUTUAL INFLUENCE OF PWM INVERTER AND D.C. CHOPPER IN FREQUENCY CONTROLLED INDUCTION MOTOR DRIVES
By E. CH. Andresen; U. Tenne [View]
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Abstract: PWM induction motor drives with d.c. chopper control of the voltage intermediate circuit may be disturbed by interactions generating d.c. components in the motor phases, mechanical resonance etc. Load dependent synchronization of inverter and chopper pulse frequency occurs automatically causing true motor running. The phenomena are investigated analytically, experimentally and by computer modelling.

EPE 1987 - 23 - Lecture Session 3.5: INDUCTION MOTOR DRIVES (II)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 23 - Lecture Session 3.5: INDUCTION MOTOR DRIVES (II)
	[return to parent folder]

	MICROPROCESSOR CONTROL OF A DOUBLE-FED AC MACHINE WITH A VOLTAGE SOURCE GTO INVERTER IN THE ROTOR CIRCUIT By D. Arsudis	[View] [Download]
Abstract: This paper deals with the control of a wound rotor induction machine, with the stator being connected to the constant frequency line and the rotor fed by a voltage source GTO inverter. Applying field orientation a variable speed generator is obtained, with a decoupled control of stator active and reactive power even during transient operation. All control tasks as well as the modulation of the inverter are carried out by a single 16-bit microprocessor. Feeding almost sinusoidal rotor currents, the variable frequency grid harmonics can be nearly eliminated.

	SIMPLE LOAD-ANGLE CONTROL METHOD FOR INDUCTION MACHINES FED BY CURRENT SOURCE INVERTERS By D. Horstmann; A. Tarsoly	[View] [Download]
Abstract: In this paper a simple field orientated control method for induction machines fed by current source inverters is presented. The method is based on a feed forward control of the rotor frequency. A load-angle control circuit is added, which ensures by means of a fundamental frequency model that the necessary mean load-angle is suppIied to the induction machine. The dc-link current and the drive's speed are measured and used as inputs to the model. For sufficiently high speeds the control operates in the well known fundamental switching mode. In the lower frequency range the feed forward inverter control, which is subordinated to the closed loop control, generates a pulse pattern, synchronized to the fundamental frequency of the current, to reduce torque pulsations of low order. A free running mode of operation is performed in the range of even lower frequencies down to zero, where also a special shaping of the dc-link current is applied. The control is executed in a microcomputer system. The steady state and dynamic behaviour of the drive are demonstrated by virtue of measurements on a test stand in both the pulsing and in the fundamental switching mode.

	ON THE MUTUAL INFLUENCE OF PWM INVERTER AND D.C. CHOPPER IN FREQUENCY CONTROLLED INDUCTION MOTOR DRIVES By E. CH. Andresen; U. Tenne	[View] [Download]
Abstract: PWM induction motor drives with d.c. chopper control of the voltage intermediate circuit may be disturbed by interactions generating d.c. components in the motor phases, mechanical resonance etc. Load dependent synchronization of inverter and chopper pulse frequency occurs automatically causing true motor running. The phenomena are investigated analytically, experimentally and by computer modelling.