EPE Association: EPE 2009 - Subtopic 05-1

EPE 2009 - Subtopic 05-1 - LS: 'Matrix Converters'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 05: 'Hard Switching Converters and Control' > EPE 2009 - Subtopic 05-1 - LS: 'Matrix Converters'

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   IMPLEMENTATION OF THREE-PHASE FREQUENCY CONVERTERS BASED ON PWM AC MATRIX-REACTANCE CHOPPER WITH BUCK-BOOST TOPOLOGY
By Zbigniew FEDYCZAK, PAWEl SZCZESNIAK, Jacek KANIEWSKI, Grzegorz TADRA [View]
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Abstract: This paper deals with three-phase direct matrix-reactance frequency converters (MRFC) based on unipolar PWM AC matrix-reactance choppers (MRC). Each MRC with conventional topology has two synchronous-connected switches (SCS) sets. In the MRFC, unlike the MRC topology, one of SCS sets is replaced by a matrix-connected switches (MCS) set in order to make possible of the load voltage frequency change. This paper presents a design and implementation of two of nine solutions of the MRFC which based on MRC with buck-boost topology. In proposed realizations 9 bipolar and bidirectional IGBT switches plus 3 bipolar and unidirectional IGBT switches are used. A simple low frequency transfer matrix control strategy (modified classical Venturini control strategy) is applied to control of the voltage or current source MC. The modification depends on MC switching during time interval, which is a part of the sequence period. The for step current-direction-based commutation strategy is also used. The specialized DSP and FPGA cards are used in the control circuit realization. Experimental test results of ca 1 kVA laboratory model are presented to confirm the viability of the proposed MRFC solutions.

   Power Density Improvement and Robust Commutation for a 100 kW Si-SiC Matrix Converter
By Lee EMPRINGHAM, Pat WHEELER, Jon CLARE [View]
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Abstract: A 100kW matrix converter designed for aerospace applications using Silicon Carbide schottky barrier diodes and silicon IGBTs to construct the power circuit is presented. Calorimetric methods will be used to determine improvements in switching losses with the final aim of reducing the size of the passive components. A robust commutation method which eliminates the need for extra external current direction sensors, further increasing the power density, is presented.

   Starting method of Permanent Magnet Syncronous Mortors using Simplified Matrix Converter
By Takaharu TAKESHITA, Yasuhiro MIURA [View]
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Abstract: From the reasons for fossil fuel depletion and global environmental problem in recent years, power electronics devices with higher efficiency have been required. In industrial field, electric power of seventy percentages in Japan is used for the application systems of motors. The motor drive systems are divided into two types. One is constant speed applications such as fans and blowers. Another is variable speed control applications such as air conditioners and electric vehicles. In the constant speed applications, induction motors are exclusively used because they can be driven by directly connecting them to commercial three-phase power supply without starter. However, the induction motors are not good at efficiency and size compared with Permanent Magnet Synchronous Motors (PMSM). The PMSM with the cage winding driven by the commercial power supply has been proposed for the constant speed applications. However, by the variation of the amplitude of the source voltage, the large reactive current is generated. This paper presents a starting system of the PMSM for constant speed application driven by the commercial three-phase power supply. The starting system has an LC filter and a simple power converter. The power converter configuration which is called Simplified Matrix Converter (SMC) reduces the number of bidirectional switches to four from nine of general three-phase to three-phase matrix converter. Therefore, the system can realize cost reduction and downsizing. The authors propose the control scheme for starting the PMSM and stable drive at synchronous speed. The effectiveness of the proposed control system has been verified by experiments.

EPE 2009 - Subtopic 05-1 - LS: 'Matrix Converters'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 05: 'Hard Switching Converters and Control' > EPE 2009 - Subtopic 05-1 - LS: 'Matrix Converters'
	[return to parent folder]

	IMPLEMENTATION OF THREE-PHASE FREQUENCY CONVERTERS BASED ON PWM AC MATRIX-REACTANCE CHOPPER WITH BUCK-BOOST TOPOLOGY By Zbigniew FEDYCZAK, PAWEl SZCZESNIAK, Jacek KANIEWSKI, Grzegorz TADRA	[View] [Download]
Abstract: This paper deals with three-phase direct matrix-reactance frequency converters (MRFC) based on unipolar PWM AC matrix-reactance choppers (MRC). Each MRC with conventional topology has two synchronous-connected switches (SCS) sets. In the MRFC, unlike the MRC topology, one of SCS sets is replaced by a matrix-connected switches (MCS) set in order to make possible of the load voltage frequency change. This paper presents a design and implementation of two of nine solutions of the MRFC which based on MRC with buck-boost topology. In proposed realizations 9 bipolar and bidirectional IGBT switches plus 3 bipolar and unidirectional IGBT switches are used. A simple low frequency transfer matrix control strategy (modified classical Venturini control strategy) is applied to control of the voltage or current source MC. The modification depends on MC switching during time interval, which is a part of the sequence period. The for step current-direction-based commutation strategy is also used. The specialized DSP and FPGA cards are used in the control circuit realization. Experimental test results of ca 1 kVA laboratory model are presented to confirm the viability of the proposed MRFC solutions.

	Power Density Improvement and Robust Commutation for a 100 kW Si-SiC Matrix Converter By Lee EMPRINGHAM, Pat WHEELER, Jon CLARE	[View] [Download]
Abstract: A 100kW matrix converter designed for aerospace applications using Silicon Carbide schottky barrier diodes and silicon IGBTs to construct the power circuit is presented. Calorimetric methods will be used to determine improvements in switching losses with the final aim of reducing the size of the passive components. A robust commutation method which eliminates the need for extra external current direction sensors, further increasing the power density, is presented.

	Starting method of Permanent Magnet Syncronous Mortors using Simplified Matrix Converter By Takaharu TAKESHITA, Yasuhiro MIURA	[View] [Download]
Abstract: From the reasons for fossil fuel depletion and global environmental problem in recent years, power electronics devices with higher efficiency have been required. In industrial field, electric power of seventy percentages in Japan is used for the application systems of motors. The motor drive systems are divided into two types. One is constant speed applications such as fans and blowers. Another is variable speed control applications such as air conditioners and electric vehicles. In the constant speed applications, induction motors are exclusively used because they can be driven by directly connecting them to commercial three-phase power supply without starter. However, the induction motors are not good at efficiency and size compared with Permanent Magnet Synchronous Motors (PMSM). The PMSM with the cage winding driven by the commercial power supply has been proposed for the constant speed applications. However, by the variation of the amplitude of the source voltage, the large reactive current is generated. This paper presents a starting system of the PMSM for constant speed application driven by the commercial three-phase power supply. The starting system has an LC filter and a simple power converter. The power converter configuration which is called Simplified Matrix Converter (SMC) reduces the number of bidirectional switches to four from nine of general three-phase to three-phase matrix converter. Therefore, the system can realize cost reduction and downsizing. The authors propose the control scheme for starting the PMSM and stable drive at synchronous speed. The effectiveness of the proposed control system has been verified by experiments.