EPE Association: EPE 2020 - DS2c-2: Modular Multilevel Converters-2

EPE 2020 - DS2c-2: Modular Multilevel Converters-2
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 - DS2c-2: Modular Multilevel Converters-2

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   Adaptive Thermal Control for MOSFET-Based Modular Multilevel Converter
By Tianxiang YIN [View]
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Abstract: This paper analyzes the working states of the MOSFET-based MMC submodule, and proposes a control scheme which makes full use of the bi-direction conducting characteristics of MOSFET to improve the unbalanced thermal distribution problem in MMC without adding additional devices. Simulation and calculation results verify the effectiveness of the scheme.

   Analysis of the impact of manufacturing dissymmetry on current distribution for magnetically coupled interleaved inverters
By Rita MATTAR [View]
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Abstract: The impact of realistic cases of manufacturing dissymmetry on the distribution of the leg currents ispresented for magnetically coupled interleaved inverters. The study of the parametric variations of thepassive elements constituting the equivalent electrical circuit is carried out with an open loop controlstrategy. This parametric variation is made in two stages. The first deals with simple cases ofdissymmetry that only affect one ICT. The second is based on the worst-case statistics, formed bymultiple cases of dissymmetry on several ICTs. This study allows the understanding of the evolution ofthe currents in the cases of dissymmetry to ensure their control and their balancing. Then, thesedissymmetries are simulated with a closed loop control strategy in order to test their impacts on the duty cycles.

   Five-level nested inverter with neutral point connection
By Juhamatti KORHONEN [View]
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Abstract: Multilevel inverter technology has been a well-established concept especially in medium voltage drives. This paper presents a new five-level nested inverter topology, that has a neutral point connection and two flying capacitors per phase. Compared to five-level topologies presented previously, the proposed topology has the same switch count, but fewer of the switching devices are rated at half of the DC link voltage. The operation of the topology is demonstrated with system level and thermal loss simulations. The simulations show that the topology produces an ideal five-level pulse width modulated output voltage without any unnecessary commutations. The loss simulations show the trending and the distribution of power losses for the phase-leg semiconductor devices as a function of output frequency with a linear u/f curve.

   Impact on the electrical characteristics, waveforms and losses of the zero-sequence injection on the Modular Multilevel Converter
By Francois GRUSON [View]
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Abstract: The MMC is the solution today to connect HVDC grids to the current HVAC grid. This paper proposes to evaluate the impact of Zero Sequence Voltage Injection variants, which until now, have not been extensively studied. Such techniques can involve, for example, a reduction of the SM capacitor value, the number of SM requirement and converter losses. The paper presents MMC current model, control and highlights the implication of the zero-sequence voltage. Grid current control structure with the introduction of the zero-sequence voltage is presented in different techniques. These modulation schemes are compared through two main quantities in MMC, the energy requirement defining the SM capacitance value and the power losses.

EPE 2020 - DS2c-2: Modular Multilevel Converters-2
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 - DS2c-2: Modular Multilevel Converters-2
	[return to parent folder]

	Adaptive Thermal Control for MOSFET-Based Modular Multilevel Converter By Tianxiang YIN	[View] [Download]
Abstract: This paper analyzes the working states of the MOSFET-based MMC submodule, and proposes a control scheme which makes full use of the bi-direction conducting characteristics of MOSFET to improve the unbalanced thermal distribution problem in MMC without adding additional devices. Simulation and calculation results verify the effectiveness of the scheme.

	Analysis of the impact of manufacturing dissymmetry on current distribution for magnetically coupled interleaved inverters By Rita MATTAR	[View] [Download]
Abstract: The impact of realistic cases of manufacturing dissymmetry on the distribution of the leg currents ispresented for magnetically coupled interleaved inverters. The study of the parametric variations of thepassive elements constituting the equivalent electrical circuit is carried out with an open loop controlstrategy. This parametric variation is made in two stages. The first deals with simple cases ofdissymmetry that only affect one ICT. The second is based on the worst-case statistics, formed bymultiple cases of dissymmetry on several ICTs. This study allows the understanding of the evolution ofthe currents in the cases of dissymmetry to ensure their control and their balancing. Then, thesedissymmetries are simulated with a closed loop control strategy in order to test their impacts on the duty cycles.

	Five-level nested inverter with neutral point connection By Juhamatti KORHONEN	[View] [Download]
Abstract: Multilevel inverter technology has been a well-established concept especially in medium voltage drives. This paper presents a new five-level nested inverter topology, that has a neutral point connection and two flying capacitors per phase. Compared to five-level topologies presented previously, the proposed topology has the same switch count, but fewer of the switching devices are rated at half of the DC link voltage. The operation of the topology is demonstrated with system level and thermal loss simulations. The simulations show that the topology produces an ideal five-level pulse width modulated output voltage without any unnecessary commutations. The loss simulations show the trending and the distribution of power losses for the phase-leg semiconductor devices as a function of output frequency with a linear u/f curve.

	Impact on the electrical characteristics, waveforms and losses of the zero-sequence injection on the Modular Multilevel Converter By Francois GRUSON	[View] [Download]
Abstract: The MMC is the solution today to connect HVDC grids to the current HVAC grid. This paper proposes to evaluate the impact of Zero Sequence Voltage Injection variants, which until now, have not been extensively studied. Such techniques can involve, for example, a reduction of the SM capacitor value, the number of SM requirement and converter losses. The paper presents MMC current model, control and highlights the implication of the zero-sequence voltage. Grid current control structure with the introduction of the zero-sequence voltage is presented in different techniques. These modulation schemes are compared through two main quantities in MMC, the energy requirement defining the SM capacitance value and the power losses.