EPE Association: EPE 2009 - Subtopic 05-3 - LS: 'Multi-Level Converters (I)'

EPE 2009 - Subtopic 05-3 - LS: 'Multi-Level Converters (I)'
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 05-3 - LS: 'Multi-Level Converters (I)'

   [return to parent folder]

   On Dynamics and Voltage Control of the Modular Multilevel Converter
By ANTONIOS ANTONOPOULOS, LENNART Ã„NGQUIST, HANS-PETER NEE [View]
[Download]

Abstract: This paper discusses the impact of modulation on stability issues of the Modular Multilevel Converter (M2C). The main idea is to describe the operation of this converter system mathematically, and suggest a control method that offers stable operation in the whole operation range. A possible approach is to assume a continuous model, where all the modules in each arm are represented by variable voltage sources, and as a result, all pulse width modulation effects are disregarded. After simulating this model and testing different control methods, useful conclusions on the operation of the M2C have been extracted. The control methods are then implemented on a model with discrete half-bridge modules, in order to compare the results and to validate the continuous model approach. When assuring that this model functions as expected, the goal of this paper is to conclude into a self-stabilizing voltage controller. A controller is proposed, which eliminates circulating currents between the phase legs and balances the arm voltages regardless of the imposed alteranting current.

   Three level MV converter using series connected IGBTâ€™s
By stig MUNK-NIELSEN, jan SUNDVALL, Mads VAERENS [View]
[Download]

Abstract: A simple method of serial connecting IGBTâ€™s is applied and standard low voltage IGBT modules are used in the MV test inverter to evaluate the method. The dc link voltage is 2.4 kV and the RMS output line to line voltage is 1.7kV. The method works and test experiences are presented in paper

   Multilevel Dodecagonal Space Vector Generation for Open-end Winding Induction Motor Drive Using Conventional Three Level Inverters
By Gopakumar K, Anandarup DAS, Rijil RAMCHAND, Sivakumar K, Chintan PATEL [View]
[Download]

Abstract: A novel dodecagonal space vector structure for induction motor drive is presented in this paper. It consists of two dodecagons, with the radius of the outer one twice the inner one. Compared to existing dodecagonal space vector structures, to achieve the same PWM output voltage quality, the proposed topology lowers the switching frequency of the inverters and reduces the device ratings to half. At the same time, other benefits obtained from existing dodecagonal space vector structure are retained here. This includes the extension of the linear modulation range and elimination of all 6nÂ±1 harmonics (n=odd) from the phase voltage. The proposed structure is realized by feeding an open-end winding induction motor with two conventional three level inverters. A detailed calculation of the PWM timings for switching the space vector points is also presented. Simulation and experimental results indicate the possible application of the proposed idea for high power drives.

EPE 2009 - Subtopic 05-3 - LS: 'Multi-Level Converters (I)'
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 05-3 - LS: 'Multi-Level Converters (I)'
	[return to parent folder]

	On Dynamics and Voltage Control of the Modular Multilevel Converter By ANTONIOS ANTONOPOULOS, LENNART Ã„NGQUIST, HANS-PETER NEE	[View] [Download]
Abstract: This paper discusses the impact of modulation on stability issues of the Modular Multilevel Converter (M2C). The main idea is to describe the operation of this converter system mathematically, and suggest a control method that offers stable operation in the whole operation range. A possible approach is to assume a continuous model, where all the modules in each arm are represented by variable voltage sources, and as a result, all pulse width modulation effects are disregarded. After simulating this model and testing different control methods, useful conclusions on the operation of the M2C have been extracted. The control methods are then implemented on a model with discrete half-bridge modules, in order to compare the results and to validate the continuous model approach. When assuring that this model functions as expected, the goal of this paper is to conclude into a self-stabilizing voltage controller. A controller is proposed, which eliminates circulating currents between the phase legs and balances the arm voltages regardless of the imposed alteranting current.

	Three level MV converter using series connected IGBTâ€™s By stig MUNK-NIELSEN, jan SUNDVALL, Mads VAERENS	[View] [Download]
Abstract: A simple method of serial connecting IGBTâ€™s is applied and standard low voltage IGBT modules are used in the MV test inverter to evaluate the method. The dc link voltage is 2.4 kV and the RMS output line to line voltage is 1.7kV. The method works and test experiences are presented in paper

	Multilevel Dodecagonal Space Vector Generation for Open-end Winding Induction Motor Drive Using Conventional Three Level Inverters By Gopakumar K, Anandarup DAS, Rijil RAMCHAND, Sivakumar K, Chintan PATEL	[View] [Download]
Abstract: A novel dodecagonal space vector structure for induction motor drive is presented in this paper. It consists of two dodecagons, with the radius of the outer one twice the inner one. Compared to existing dodecagonal space vector structures, to achieve the same PWM output voltage quality, the proposed topology lowers the switching frequency of the inverters and reduces the device ratings to half. At the same time, other benefits obtained from existing dodecagonal space vector structure are retained here. This includes the extension of the linear modulation range and elimination of all 6nÂ±1 harmonics (n=odd) from the phase voltage. The proposed structure is realized by feeding an open-end winding induction motor with two conventional three level inverters. A detailed calculation of the PWM timings for switching the space vector points is also presented. Simulation and experimental results indicate the possible application of the proposed idea for high power drives.