EPE Association: EPE 2011 - LS4e: Topic 05: Matrix converters

EPE 2011 - LS4e: Topic 05: Matrix converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 05: Hard Switching Inverters and Control > EPE 2011 - LS4e: Topic 05: Matrix converters

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   A High Power Density SiC-JFet-based Matrix Converter
By Liliana DE LILLO, Lee EMPRINGHAM, Martin SCHULZ, Pat WHEELER [View]
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Abstract: Continuous development in semiconductor material allows designers engineers to push power density of inverter technology to new limits. The Matrix Converter topology itself, by not including the large DC-link capacitors of a typical rectifier-DC-link – Inverter topology offers an advantageous starting point in order to achieve a reliable and compact implementation of a power converter capable of working at higher operating temperatures. This paper describes the design of a Silicon Carbide JFET-based matrix converter which has been developed to reach a target of power density of 20kW/dm3 with forced air cooling, based on Infineon Technology for the power circuit and its control.

   DC circulating Current for Capacitor Voltage Balancing in Modular Multilevel Matrix Converter
By Colin OATES, Gopal MONDAL [View]
[Download]

Abstract: A high voltage matrix converter for interconnecting two AC power networks has been described previous in which the links bridging the phases of the two AC networks are formed from a large number of capacitive submodules linked in series. The operation of the converter was described, including the method of maintaining the charge in the individual submodules equal within a link, but did not consider the method of maintaining the net charge of the links. This paper presents a method of equalising the net link charge by circulating DC current within the converter over a series of successive steps. A set of simultaneous expressions are derived presenting a “cost function” for each of the possible solutions considered and showing the comparative affect each solution will have on the overall variation from the ideal set point. A selection is made at each sample point of the best current path, its magnitude and polarity. The MATLAB model described in the original paper has been adapted to show the operation of the algorithm and its operation, this being demonstrated by varying the submodule capacitance across the converter. Further work required is to explore the stability of the algorithm for a wide range of conditions ranging from the presence of non-positive sequence being present on the AC supplies to the occurrence of phase faults.

   Resonant Controllers for the Control of 4-Leg Matrix Converters
By Roberto CARDENAS, Carlos JURI, Ruben PEÑA, Jon CLARE, Patrick WHEELER [View]
[Download]

Abstract: Matrix Converters (MCs) have some advantages when compared to conventional back-to-back PWM voltage source converters. The converter is considered more reliable and smaller because the bulky DC capacitors are eliminated from the topology. For AC to AC power conversion, the size and weight of the whole generation system are much reduced when back to back converters are replaced by MCs. To supply electrical energy to an unbalanced 3-phase stand-alone load, a fourth leg is required to provide a path for the zero sequence load current. Moreover, closed loop regulation of the load voltage is required. In this paper the design and implementation of a resonant control system for 4-leg MCs is presented. Experimental results, obtained from a prototype, are discussed.

EPE 2011 - LS4e: Topic 05: Matrix converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 05: Hard Switching Inverters and Control > EPE 2011 - LS4e: Topic 05: Matrix converters
	[return to parent folder]

	A High Power Density SiC-JFet-based Matrix Converter By Liliana DE LILLO, Lee EMPRINGHAM, Martin SCHULZ, Pat WHEELER	[View] [Download]
Abstract: Continuous development in semiconductor material allows designers engineers to push power density of inverter technology to new limits. The Matrix Converter topology itself, by not including the large DC-link capacitors of a typical rectifier-DC-link – Inverter topology offers an advantageous starting point in order to achieve a reliable and compact implementation of a power converter capable of working at higher operating temperatures. This paper describes the design of a Silicon Carbide JFET-based matrix converter which has been developed to reach a target of power density of 20kW/dm3 with forced air cooling, based on Infineon Technology for the power circuit and its control.

	DC circulating Current for Capacitor Voltage Balancing in Modular Multilevel Matrix Converter By Colin OATES, Gopal MONDAL	[View] [Download]
Abstract: A high voltage matrix converter for interconnecting two AC power networks has been described previous in which the links bridging the phases of the two AC networks are formed from a large number of capacitive submodules linked in series. The operation of the converter was described, including the method of maintaining the charge in the individual submodules equal within a link, but did not consider the method of maintaining the net charge of the links. This paper presents a method of equalising the net link charge by circulating DC current within the converter over a series of successive steps. A set of simultaneous expressions are derived presenting a “cost function” for each of the possible solutions considered and showing the comparative affect each solution will have on the overall variation from the ideal set point. A selection is made at each sample point of the best current path, its magnitude and polarity. The MATLAB model described in the original paper has been adapted to show the operation of the algorithm and its operation, this being demonstrated by varying the submodule capacitance across the converter. Further work required is to explore the stability of the algorithm for a wide range of conditions ranging from the presence of non-positive sequence being present on the AC supplies to the occurrence of phase faults.

	Resonant Controllers for the Control of 4-Leg Matrix Converters By Roberto CARDENAS, Carlos JURI, Ruben PEÑA, Jon CLARE, Patrick WHEELER	[View] [Download]
Abstract: Matrix Converters (MCs) have some advantages when compared to conventional back-to-back PWM voltage source converters. The converter is considered more reliable and smaller because the bulky DC capacitors are eliminated from the topology. For AC to AC power conversion, the size and weight of the whole generation system are much reduced when back to back converters are replaced by MCs. To supply electrical energy to an unbalanced 3-phase stand-alone load, a fourth leg is required to provide a path for the zero sequence load current. Moreover, closed loop regulation of the load voltage is required. In this paper the design and implementation of a resonant control system for 4-leg MCs is presented. Experimental results, obtained from a prototype, are discussed.