EPE Association: EPE 2021 - Converter Modelling and Low-level Control, including Gate-Drives

EPE 2021 - Converter Modelling and Low-level Control, including Gate-Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 03: Measurement and Control > EPE 2021 - Converter Modelling and Low-level Control, including Gate-Drives

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   An Analytical Model for the Prediction of the Maximum Output Voltage Reachable with an Ultra-high Voltage Flyback Converter Driving Capacitive Actuators
By Raphael MOTTET [View]
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Abstract: The DC-DC flyback converter is one of the most suitable topologies to generate the voltages necessary to operate Dielectric Elastomer Actuators. Voltages which can range from 5 to 20 kV.Previous works demonstrated through experiments the flyback's ability to generate such voltages but also revealed that parasitic elements - mainly parasitic capacitances - have a major influence on limiting how high the output voltage could be increased.In this paper, through the development of an analytical model of the system, the influence of each of the aforementioned parasitic elements is confirmed and also quantifiable. Thanks to this model, it is now possible to anticipate the theoretical maximum output voltage a given system is capable to reach.

   Investigation of Gate Current Shaping for SiC-based Power Modules on Electrical Drive System Power Losses
By Mohamad SAYED [View]
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Abstract: An adjustable current source driver based on shaping the gate current of a SiC MOSFET is presented in this paper. A sequential optimization algorithm to reduce the turn-on and turn-off switching losses while maintaining equal device stress is developed. The proposed driver uses the maximum operating conditions in the entire operating range, in contrast to commercial drivers which are usually designed for a worst-case operating point. Thus, an improvement on full load as well as on partial load conditions is attained in comparison to the conventional voltage source driver. At system level, the reduction of switching losses lead to an improvement of the inverter efficiency and to a reduction of the electrical drive WLTP cycle losses by 7\%.

   Stability Analysis of a DC-link with Nonlinear Load - An Overview
By Mohamad KOTEICH [View]
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Abstract: This paper studies the stability of a dc-link when supplying a nonlinear load through a power converter. The dc-link often comprises an LC filter, which is subject to oscillation. The nonlinear behavior of the load reduces the damping of the system and may result in an unstable operation and system failure. This paper reviews the major modeling and active stabilization methods. It shows the shortcomings of the common assumption of constant-power load, namely, it fails to predict the practical stability limits and leads to an over-conservative design. A more realistic and systematic approach, based on the small-signal model of the system, is presented and analyzed. A comprehensive review of active stabilization methods is presented. Numerical simulation is used to validate the theoretical concepts.

EPE 2021 - Converter Modelling and Low-level Control, including Gate-Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 03: Measurement and Control > EPE 2021 - Converter Modelling and Low-level Control, including Gate-Drives
	[return to parent folder]

	An Analytical Model for the Prediction of the Maximum Output Voltage Reachable with an Ultra-high Voltage Flyback Converter Driving Capacitive Actuators By Raphael MOTTET	[View] [Download]
Abstract: The DC-DC flyback converter is one of the most suitable topologies to generate the voltages necessary to operate Dielectric Elastomer Actuators. Voltages which can range from 5 to 20 kV.Previous works demonstrated through experiments the flyback's ability to generate such voltages but also revealed that parasitic elements - mainly parasitic capacitances - have a major influence on limiting how high the output voltage could be increased.In this paper, through the development of an analytical model of the system, the influence of each of the aforementioned parasitic elements is confirmed and also quantifiable. Thanks to this model, it is now possible to anticipate the theoretical maximum output voltage a given system is capable to reach.

	Investigation of Gate Current Shaping for SiC-based Power Modules on Electrical Drive System Power Losses By Mohamad SAYED	[View] [Download]
Abstract: An adjustable current source driver based on shaping the gate current of a SiC MOSFET is presented in this paper. A sequential optimization algorithm to reduce the turn-on and turn-off switching losses while maintaining equal device stress is developed. The proposed driver uses the maximum operating conditions in the entire operating range, in contrast to commercial drivers which are usually designed for a worst-case operating point. Thus, an improvement on full load as well as on partial load conditions is attained in comparison to the conventional voltage source driver. At system level, the reduction of switching losses lead to an improvement of the inverter efficiency and to a reduction of the electrical drive WLTP cycle losses by 7\%.

	Stability Analysis of a DC-link with Nonlinear Load - An Overview By Mohamad KOTEICH	[View] [Download]
Abstract: This paper studies the stability of a dc-link when supplying a nonlinear load through a power converter. The dc-link often comprises an LC filter, which is subject to oscillation. The nonlinear behavior of the load reduces the damping of the system and may result in an unstable operation and system failure. This paper reviews the major modeling and active stabilization methods. It shows the shortcomings of the common assumption of constant-power load, namely, it fails to predict the practical stability limits and leads to an over-conservative design. A more realistic and systematic approach, based on the small-signal model of the system, is presented and analyzed. A comprehensive review of active stabilization methods is presented. Numerical simulation is used to validate the theoretical concepts.