EPE Association: EPE 1993 - 06 - Lecture Session L2c: DRIVES: MATRIX CYCLOS AND INVERTERS

EPE 1993 - 06 - Lecture Session L2c: DRIVES: MATRIX CYCLOS AND INVERTERS
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   AN INTEGRATED BOOST-BUCK AND MATRIX CONVERTER TOPOLOGY FOR LOW SPEED DRIVES
By D. Antic; J. B. Klaassens; W. Deleroi [View]
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Abstract: A novel integrated buck-boost and matrix three-phase power converter topology is applied for an ac-drive. The combination performs some advantages: insignificant stator current harmonics at low converter switching frequencies which result in low torque ripple, boosting of the converter output voltage can be performed enabling higher than nominal stator voltages, simple implementation of the high performance induction motor vector control based only on stator currents monitoring. Main drawback is the number of switches for this configuration (12 bidirectional switches or a total of 24 IGBTs). However, with the expected break-through in the bidirectional semiconductor technology this motor drive concept gains popularity.

   A LOW LOSS MATRIX CONVERTER FOR AC VARIABLE-SPEED DRIVES
By P. W. Wheeler; D. A. Grant [View]
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Abstract: This paper reports the construction and testing of a matrix converter in which novel switching methods are employed to minimise the losses in the switching devices. A mixture of hard and soft commutation is used during each cycle of the output waveform. This permits losses to be reduced to a minimum while waveform quality is enhanced. It is demonstrated that at elevated switching frequencies the efficiency of a matrix converter can be comparable to that of the traditional inverter drives. IGBTs are used as the switching devices and a microcontroller is used to generate the switching waveforms and provide control. Reactive components have been minimised so that the matrix converter is now approaching an all-silicon solution to ac-ac power conversion. Practical results are presented.

   SYNTHESIS OF CYCLOCONVERTER AND CURRENT-SOURCE-INVERTER PRESENTATION OF A NEW CONTROL STRATEGY
By P. Hussels; M. Mehne; F. Hentschel [View]
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Abstract: Several proposals have been published to combine the principles of operation of the cycloconverter (CC) and of the current-source-inverter (CSI) in large power adjustable speed drives with synchronous motors. Converters allowing such a combination can be referred to as "CC/CSl-converters". The objective of this research has been to overcome the well-known difficulties of the load-commutated current-source-inverter at standstill and at low speeds (torque ripple and unsufficient commutating voltage). In this paper a novel control strategy is described for a CC/CSl-converter feeding a synchronous motor with six stator windings. This novel control strategy is compared to a control strategy previously published, where the same CC/CSl-converter feeds a usual synchronous motor with three stator windings. A first industrial application of a CC/CSI-converter drive will be described.

   DOUBLE-PULSE INVERTER FEEDS 6-PHASE ASYNCHRONOUS MOTOR FOR HARMONIC LOSS REDUCTION
By V. Weisgerber [View]
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Abstract: Especially for battery-fed drives e.g. in electric vehicles a dc link capacitor is needed to reduce harmonic losses caused by the de link current. For this a new drive with a double-pulse inverter and a double-fed asynchronous motor is presented. With this the dc link current harmonics can nearly be halved and the harmonic torque can be reduced as well. The double-pulse inverter consists of two inverters taking the same dc link voltage. So, the double-pulse inverter is redundant, e.g. in case of a defect in one inverter it is possible to drive with reduced power. The asynchronous motor has two 3-phase windings and can easily be developed out of a standard machine. With this, each inverter feeds 3 phases of the motor. A theoretical 6-phase model of the motor can be reduced to a 2-phase model. For simulation the motor can be described with space vectors. Simulation results and the experiences made show the advantages mentioned.

   3 LEVEL GTO CONVERTER-INVERTER PAIR SYSTEM FOR LARGE CAPACITY INDUCTION MOTOR DRIVE
By S. Tamai; M. Koyama; T. Fujii; S. Mizoguchi; T. Kawabata [View]
[Download]

Abstract: A 3 level converter-inverter pair system for large capacity induction motor drives is proposed. A new PWM method for the 3 level converter and inverter based on the space voltage vector is proposed. The experimental results clarify that the PWM method can minimize the harmonic components of the output voltage and current under the minimum pulse width limitation of the GTO's and suppress the fluctuation of the neutral point DC voltage. Loss factor sigma is calculated to analyze current distortion of the synchronous PWM method for 3 level converter. The characteristics of the converter-inverter pair system are confirmed by IGBT test equipment. High performance 4000KV A GTO converter-inverter pair system is made to drive an induction motor.

EPE 1993 - 06 - Lecture Session L2c: DRIVES: MATRIX CYCLOS AND INVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 06 - Lecture Session L2c: DRIVES: MATRIX CYCLOS AND INVERTERS
	[return to parent folder]

	AN INTEGRATED BOOST-BUCK AND MATRIX CONVERTER TOPOLOGY FOR LOW SPEED DRIVES By D. Antic; J. B. Klaassens; W. Deleroi	[View] [Download]
Abstract: A novel integrated buck-boost and matrix three-phase power converter topology is applied for an ac-drive. The combination performs some advantages: insignificant stator current harmonics at low converter switching frequencies which result in low torque ripple, boosting of the converter output voltage can be performed enabling higher than nominal stator voltages, simple implementation of the high performance induction motor vector control based only on stator currents monitoring. Main drawback is the number of switches for this configuration (12 bidirectional switches or a total of 24 IGBTs). However, with the expected break-through in the bidirectional semiconductor technology this motor drive concept gains popularity.

	A LOW LOSS MATRIX CONVERTER FOR AC VARIABLE-SPEED DRIVES By P. W. Wheeler; D. A. Grant	[View] [Download]
Abstract: This paper reports the construction and testing of a matrix converter in which novel switching methods are employed to minimise the losses in the switching devices. A mixture of hard and soft commutation is used during each cycle of the output waveform. This permits losses to be reduced to a minimum while waveform quality is enhanced. It is demonstrated that at elevated switching frequencies the efficiency of a matrix converter can be comparable to that of the traditional inverter drives. IGBTs are used as the switching devices and a microcontroller is used to generate the switching waveforms and provide control. Reactive components have been minimised so that the matrix converter is now approaching an all-silicon solution to ac-ac power conversion. Practical results are presented.

	SYNTHESIS OF CYCLOCONVERTER AND CURRENT-SOURCE-INVERTER PRESENTATION OF A NEW CONTROL STRATEGY By P. Hussels; M. Mehne; F. Hentschel	[View] [Download]
Abstract: Several proposals have been published to combine the principles of operation of the cycloconverter (CC) and of the current-source-inverter (CSI) in large power adjustable speed drives with synchronous motors. Converters allowing such a combination can be referred to as "CC/CSl-converters". The objective of this research has been to overcome the well-known difficulties of the load-commutated current-source-inverter at standstill and at low speeds (torque ripple and unsufficient commutating voltage). In this paper a novel control strategy is described for a CC/CSl-converter feeding a synchronous motor with six stator windings. This novel control strategy is compared to a control strategy previously published, where the same CC/CSl-converter feeds a usual synchronous motor with three stator windings. A first industrial application of a CC/CSI-converter drive will be described.

	DOUBLE-PULSE INVERTER FEEDS 6-PHASE ASYNCHRONOUS MOTOR FOR HARMONIC LOSS REDUCTION By V. Weisgerber	[View] [Download]
Abstract: Especially for battery-fed drives e.g. in electric vehicles a dc link capacitor is needed to reduce harmonic losses caused by the de link current. For this a new drive with a double-pulse inverter and a double-fed asynchronous motor is presented. With this the dc link current harmonics can nearly be halved and the harmonic torque can be reduced as well. The double-pulse inverter consists of two inverters taking the same dc link voltage. So, the double-pulse inverter is redundant, e.g. in case of a defect in one inverter it is possible to drive with reduced power. The asynchronous motor has two 3-phase windings and can easily be developed out of a standard machine. With this, each inverter feeds 3 phases of the motor. A theoretical 6-phase model of the motor can be reduced to a 2-phase model. For simulation the motor can be described with space vectors. Simulation results and the experiences made show the advantages mentioned.

	3 LEVEL GTO CONVERTER-INVERTER PAIR SYSTEM FOR LARGE CAPACITY INDUCTION MOTOR DRIVE By S. Tamai; M. Koyama; T. Fujii; S. Mizoguchi; T. Kawabata	[View] [Download]
Abstract: A 3 level converter-inverter pair system for large capacity induction motor drives is proposed. A new PWM method for the 3 level converter and inverter based on the space voltage vector is proposed. The experimental results clarify that the PWM method can minimize the harmonic components of the output voltage and current under the minimum pulse width limitation of the GTO's and suppress the fluctuation of the neutral point DC voltage. Loss factor sigma is calculated to analyze current distortion of the synchronous PWM method for 3 level converter. The characteristics of the converter-inverter pair system are confirmed by IGBT test equipment. High performance 4000KV A GTO converter-inverter pair system is made to drive an induction motor.