EPE Association: EPE 2020 - DS2d-1: Modular Multilevel Converters-1

EPE 2020 - DS2d-1: Modular Multilevel Converters-1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - DS2d-1: Modular Multilevel Converters-1

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   A Comparison between Different Models of the Modular Multilevel Converter
By Rafael MEDEIROS [View]
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Abstract: In this article, we compare the detailed switching (DS) model of the modular multilevel converter (MMC) with the arm average model (AA), the state-space time-invariant (SSTI) model, and the harmonic state-space (HSS) model. We consider a five sub-modules (SM) and a 50 SM application. We evaluate their performance in terms of accuracy on the representation of dynamics and simulation speed. The results show that the AA can be 700 times faster than the DS model, while the SSTI and the HSS can be more than 7000 times faster than the DS model. The highest relative deviation between models is kept under 8\%.

   Active Current and Energy Control for the Quasi-Three-Level Operation Mode of an Extended Modular Multilevel Converter Topology
By Malte LORENZ [View]
[Download]

Abstract: Recently, a Quasi-Three-Level Operation Mode for a new modular multilevel converter topology hasbeen proposed. This paper presents a fundamental improvement of this operation mode which is achieved through a closed-loop branch current and energy control. The proposed approach uses the available degrees of freedom of the topology to actively balance the energies of the input capacitors and module capacitors. Moreover, the branch currents are controlled during both constant output voltage levels and transitions. In comparison to the operation mode from the literature, the proposed approach enables a stable operation with reduced input capacitances, module capacitances, peak branch currents, and converter losses. This is validated through simulations.

   An Isolated Medium-Voltage AC-DC Converter Using Level-Shifted PWM Control of a Modular Matrix Converter
By Kohei BUDO [View]
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Abstract: This paper presents level-shifted PWM control in a Modular Matrix Converter (MMxC) for an isolatedmedium-input AC-DC converter. The proposed control method can generate the multi-level output volt-age in the MMxC even when the MMxC generates the high-frequency AC voltage. The effectiveness ofthis control method is verified by experiments.

   Four-Level Inverter with Variable Voltage Levels for Hardware-in-the-Loop Emulation of Three-Phase Machines
By Manuel FISCHER [View]
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Abstract: In order to emulate the behavior of three-phase machines in a hardware-in-the-loop test bench, anapplicable power electronic device is required. For this purpose, an inverter concept with four variablevoltage levels per phase is presented. This concept precisely fulfills the requirements of three-phasemachine emulation. The presented inverter is theoretically able to adjust the ideal countervoltage coursewhich is needed to emulate three-phase machines' electrical behavior. In contrast, the countervoltagesof commonly used power electronic devices suffer from deviation caused by switched-mode operationor limited bandwidth.Within this paper the setup of the four-level inverter is presented. Besides, the paper discusses a controlstrategy for operating the four-level inverter as a three-phase machine emulator.

   Modular Multilevel Converter with Distributed Galvanic Isolation: A Decentralized Voltage Balancing Algorithm with Smart Gate Drivers
By Corentin DARBAS [View]
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Abstract: This work introduces a novel concept of Distributed Galvanic Insulation (DGI) for multilevel converters. By daisy chaining the submodule gate drivers, the requirement in terms of voltage of isolation is highly decreased. The use of Smart gate drivers, which implement advanced communication features, allows communication signals to flow along the chain. Applied to MMC, the DGI forbids the use of classical Voltage Balancing Algorithms. A new algorithm, directly integrated on the gate drivers, is proposed for DGI-MMC and is validated by simulation.

EPE 2020 - DS2d-1: Modular Multilevel Converters-1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - DS2d-1: Modular Multilevel Converters-1
	[return to parent folder]

	A Comparison between Different Models of the Modular Multilevel Converter By Rafael MEDEIROS	[View] [Download]
Abstract: In this article, we compare the detailed switching (DS) model of the modular multilevel converter (MMC) with the arm average model (AA), the state-space time-invariant (SSTI) model, and the harmonic state-space (HSS) model. We consider a five sub-modules (SM) and a 50 SM application. We evaluate their performance in terms of accuracy on the representation of dynamics and simulation speed. The results show that the AA can be 700 times faster than the DS model, while the SSTI and the HSS can be more than 7000 times faster than the DS model. The highest relative deviation between models is kept under 8\%.

	Active Current and Energy Control for the Quasi-Three-Level Operation Mode of an Extended Modular Multilevel Converter Topology By Malte LORENZ	[View] [Download]
Abstract: Recently, a Quasi-Three-Level Operation Mode for a new modular multilevel converter topology hasbeen proposed. This paper presents a fundamental improvement of this operation mode which is achieved through a closed-loop branch current and energy control. The proposed approach uses the available degrees of freedom of the topology to actively balance the energies of the input capacitors and module capacitors. Moreover, the branch currents are controlled during both constant output voltage levels and transitions. In comparison to the operation mode from the literature, the proposed approach enables a stable operation with reduced input capacitances, module capacitances, peak branch currents, and converter losses. This is validated through simulations.

	An Isolated Medium-Voltage AC-DC Converter Using Level-Shifted PWM Control of a Modular Matrix Converter By Kohei BUDO	[View] [Download]
Abstract: This paper presents level-shifted PWM control in a Modular Matrix Converter (MMxC) for an isolatedmedium-input AC-DC converter. The proposed control method can generate the multi-level output volt-age in the MMxC even when the MMxC generates the high-frequency AC voltage. The effectiveness ofthis control method is verified by experiments.

	Four-Level Inverter with Variable Voltage Levels for Hardware-in-the-Loop Emulation of Three-Phase Machines By Manuel FISCHER	[View] [Download]
Abstract: In order to emulate the behavior of three-phase machines in a hardware-in-the-loop test bench, anapplicable power electronic device is required. For this purpose, an inverter concept with four variablevoltage levels per phase is presented. This concept precisely fulfills the requirements of three-phasemachine emulation. The presented inverter is theoretically able to adjust the ideal countervoltage coursewhich is needed to emulate three-phase machines' electrical behavior. In contrast, the countervoltagesof commonly used power electronic devices suffer from deviation caused by switched-mode operationor limited bandwidth.Within this paper the setup of the four-level inverter is presented. Besides, the paper discusses a controlstrategy for operating the four-level inverter as a three-phase machine emulator.

	Modular Multilevel Converter with Distributed Galvanic Isolation: A Decentralized Voltage Balancing Algorithm with Smart Gate Drivers By Corentin DARBAS	[View] [Download]
Abstract: This work introduces a novel concept of Distributed Galvanic Insulation (DGI) for multilevel converters. By daisy chaining the submodule gate drivers, the requirement in terms of voltage of isolation is highly decreased. The use of Smart gate drivers, which implement advanced communication features, allows communication signals to flow along the chain. Applied to MMC, the DGI forbids the use of classical Voltage Balancing Algorithms. A new algorithm, directly integrated on the gate drivers, is proposed for DGI-MMC and is validated by simulation.