EPE Association: EPE 1985 - 21 - Lecture Session 3.07: SPECIAL PROBLEMS

EPE 1985 - 21 - Lecture Session 3.07: SPECIAL PROBLEMS
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   HIGH DYNAMIC FOUR-QUADRANT AC-MOTOR DRIVE WITH IMPROVED POWER-FACTOR AND ON-LINE OPTIMIZED PULSE PATTERN WITH PROMC
By H. Kohlmeier; O. Niermeyer; D. Schröder [View]
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Abstract: The power factor and the waveforms of the currents of voltage source inverters can be improved essentially when two pulse inverters are used - one at the lineside and the other at the machine-side. Both inverters are controlled by similar current vector controllers. The reference value of the stator current can be calculated by field-oriented control or by decoupling (1), (2) for example. The reference value of the line current is derived from the actual state of the mains and the machine. Furthermore on-line optimization of the pulse pattern by PROMC is used.

   MlCROCOMPUTER GATE CONTROL METHODS FOR DC LINK CONVERTERS IN ELECTRIC DRlVES
By L. Reng; H. Schumann [View]
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Abstract: Microprocessors permit flexible open-loop and closed-loop control arrangements in electric drive engineering. For voltage-source and current-source DC link converters, parameterizable inverter trigger sets are presented for which the modulation calculation is carried out on line by a microcomputer (1). For current-source DC link converters, a special current pulse procedure for reducing torque ripple at low speeds is described. A trigger set for PWM inverters with voltage-source DC link is presented that makes it possible to adopt various modulation methods. Depending on the input parameters, the most favourable type of modulation available is assigned to each operating range. A description is given of a low-cost concept for the control and actual-value conditioning of a PWM inverter with voltage-source DC link. It features a microcomputer-friendly structure (polar coordinates and integrating actual current value acquisition) and operates without speed detector.

   SELF-EXCITED INDUCTION GENERATOR / FORCE-COMMUTATED RECTIFIER SYSTEM OPERATING AS A DC POWER SUPPLY
By A. Nunes Barreto; E. H. Watanabe [View]
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Abstract: This work presents a new dc energy generation system based on a three phase self-excited induction generator coupled to a force-commutated rectifier. This rectifier is switched in such a way that makes its input current fundamental component advanced with respect to the corresponding voltage, producing a capacitive characteristic on its terminals. This characteristic helps the self-excitation and improves the dc output voltage regulation, with respect to load variation, to the range of 1 to 2%, for some firing angle. Also, this capacitive effect increases greatly the output power limit, and allows the system to supply a constant dc output voltage over a reasonably wide range of rotor speed variation. The steady-state performance of the system is analyzed based on a simplified mathematical model, which is validated experimentaly. A study on the influence of the smoothing reactor, at the rectifier output, is presented and it is shown that the system can operate properly without this reactor, if there is no limit for ripple current in the load.

   TRANSISTOR INVERTER FOR AC MOTOR DRIVES
By P. Marincic; I. Vukadin [View]
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Abstract: This paper deals with the PWM transistor inverter using duty ratio modulation technique. The voltage and current harmonics are investigated for a different number of pulses per half cycle of the line voltage. The appropriate number of pulses is selected comparing rms value of current, control complexity and number of switchings per cycle. A 0,37 kW prototype induction motor drive system has been built. The calculated and experimental results are presented.

EPE 1985 - 21 - Lecture Session 3.07: SPECIAL PROBLEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1985 - Conference > EPE 1985 - 21 - Lecture Session 3.07: SPECIAL PROBLEMS
	[return to parent folder]

	HIGH DYNAMIC FOUR-QUADRANT AC-MOTOR DRIVE WITH IMPROVED POWER-FACTOR AND ON-LINE OPTIMIZED PULSE PATTERN WITH PROMC By H. Kohlmeier; O. Niermeyer; D. Schröder	[View] [Download]
Abstract: The power factor and the waveforms of the currents of voltage source inverters can be improved essentially when two pulse inverters are used - one at the lineside and the other at the machine-side. Both inverters are controlled by similar current vector controllers. The reference value of the stator current can be calculated by field-oriented control or by decoupling (1), (2) for example. The reference value of the line current is derived from the actual state of the mains and the machine. Furthermore on-line optimization of the pulse pattern by PROMC is used.

	MlCROCOMPUTER GATE CONTROL METHODS FOR DC LINK CONVERTERS IN ELECTRIC DRlVES By L. Reng; H. Schumann	[View] [Download]
Abstract: Microprocessors permit flexible open-loop and closed-loop control arrangements in electric drive engineering. For voltage-source and current-source DC link converters, parameterizable inverter trigger sets are presented for which the modulation calculation is carried out on line by a microcomputer (1). For current-source DC link converters, a special current pulse procedure for reducing torque ripple at low speeds is described. A trigger set for PWM inverters with voltage-source DC link is presented that makes it possible to adopt various modulation methods. Depending on the input parameters, the most favourable type of modulation available is assigned to each operating range. A description is given of a low-cost concept for the control and actual-value conditioning of a PWM inverter with voltage-source DC link. It features a microcomputer-friendly structure (polar coordinates and integrating actual current value acquisition) and operates without speed detector.

	SELF-EXCITED INDUCTION GENERATOR / FORCE-COMMUTATED RECTIFIER SYSTEM OPERATING AS A DC POWER SUPPLY By A. Nunes Barreto; E. H. Watanabe	[View] [Download]
Abstract: This work presents a new dc energy generation system based on a three phase self-excited induction generator coupled to a force-commutated rectifier. This rectifier is switched in such a way that makes its input current fundamental component advanced with respect to the corresponding voltage, producing a capacitive characteristic on its terminals. This characteristic helps the self-excitation and improves the dc output voltage regulation, with respect to load variation, to the range of 1 to 2%, for some firing angle. Also, this capacitive effect increases greatly the output power limit, and allows the system to supply a constant dc output voltage over a reasonably wide range of rotor speed variation. The steady-state performance of the system is analyzed based on a simplified mathematical model, which is validated experimentaly. A study on the influence of the smoothing reactor, at the rectifier output, is presented and it is shown that the system can operate properly without this reactor, if there is no limit for ripple current in the load.

	TRANSISTOR INVERTER FOR AC MOTOR DRIVES By P. Marincic; I. Vukadin	[View] [Download]
Abstract: This paper deals with the PWM transistor inverter using duty ratio modulation technique. The voltage and current harmonics are investigated for a different number of pulses per half cycle of the line voltage. The appropriate number of pulses is selected comparing rms value of current, control complexity and number of switchings per cycle. A 0,37 kW prototype induction motor drive system has been built. The calculated and experimental results are presented.