EPE Association: EPE 2020 - DS3a: Converter Design and Optimization

EPE 2020 - DS3a: Converter Design and Optimization
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 - DS3a: Converter Design and Optimization

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   Asynchronized electromechanical converter in the electrical supply system of powerful energy consumers
By Anastasiia STOTCKAIA [View]
[Download]

Abstract: In power supply systems of large energy consumers, it is possible to use electric machine converters with asynchronized generator-engines. These devices provide uninterrupted power supply to consumers as well as guarantee such advantages as galvanic isolation, separate parameters stabilization, limitation of short-circuit currents, accumulation and conversion of kinetic energy with its subsequent conversion into electrical energy. Active frequency converters in the excitation systems of electrical machines allow the start-up of units and provide other modes of operation, including using the accumulated kinetic energy. The structure and operating modes of these converters are discussed.

   Automated Design Method for Sine Wave Filters in Motor Drive Applications with SiC-Inverters
By Thorben SCHOBRE [View]
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Abstract: This work describes a design method for sine filters used for servo motor drive applications with a two level voltage source inverters (VSI) with 1200V SiC MOSFETs. To assess the filter effectiveness inattenuating conducted EMI emissions a worst case distortion spectrum of a PWM modulated half bridge midpoint voltage is calculated. The filter and the drive system are transformed to single phase differential (DM) and common mode (CM) equivalent circuits (EQC). The implemented algorithm enables parameter studies with various filter topologies, drive systems and values of filter components. The result of an example parameter study is analyzed and a suitable filter is built up and measured. The measured filter is then compared to the design results and the deviations are discussed.

   Design Flow of a Compact High-Frequency DC/DC Converter with Optimum Average Efficiency in a Wide Operation Range
By Maximilian NITZSCHE [View]
[Download]

Abstract: The design of an LLC stage for a wide output voltage range imposes stringent challenges regardingelectrical and thermal performance. To match these requirements this paper presents the design approach and measurements of a resonant LLC converter stage, optimized for a maximum average efficiency over a wide operating range.

   Modeling of Converter Systems Paralleled via Interphase Transformers inCyclic Cascade Topology and Optimization of PWM Carrier Shifts
By Duro BASIC [View]
[Download]

Abstract: High power converters can be constructed by paralleling N interleaved converters via InterphaseTransformers (ITRs) to produce multilevel output voltages while minimizing circulating currents amongconverters. With the ITRs connected in cyclical cascade topology, the ITR voltage stress is highlydependent on number of parallel converters and phase shifts between Pulse Width Modulation (PWM)triangular carriers. To analyse the ITR system performance a model of cross-coupling produced by ITRsis needed to establish links between the converter voltages and ITR voltages and cross currentscirculating among converters. The main goal of this paper is to give a comprehensive overview of amodel of the system based on the ITR cyclical cascade topology which can be used for estimation of itsperformance. Based on this model, opportunities for minimisation of the ITR voltages and core losses,via optimization of the converter PWM carrier shifts, are identified and discussed. Application of thetheoretical results is illustrated in an example case with N=5 converters.

   Symmetric and asymmetric operating modes of hybrid cascade frequency converters
By Anastasiia STOTCKAIA [View]
[Download]

Abstract: The hybrid cascade frequency converter contains a diode rectifier connected to the network and a three-phase autonomous voltage inverter, as well as a transformer connected in parallel to the network, supplying units with active rectifiers and single-phase voltage inverters. On the load side, three-phase and single-phase inverters are connected in series. The structure of the converter allows to use the transformer for a partial load power, increase the voltage at the output, provide the required quality of voltages and currents at the input and output of the converter, power the load when some of the blocks fail. The model of the converter and investigation results are described. Control algorithms that provide power distribution between the blocks, the required quality of voltages and currents at the input and output, as well as the efficient operation of the converter when disconnecting part of the power blocks are proposed.

EPE 2020 - DS3a: Converter Design and Optimization
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 - DS3a: Converter Design and Optimization
	[return to parent folder]

	Asynchronized electromechanical converter in the electrical supply system of powerful energy consumers By Anastasiia STOTCKAIA	[View] [Download]
Abstract: In power supply systems of large energy consumers, it is possible to use electric machine converters with asynchronized generator-engines. These devices provide uninterrupted power supply to consumers as well as guarantee such advantages as galvanic isolation, separate parameters stabilization, limitation of short-circuit currents, accumulation and conversion of kinetic energy with its subsequent conversion into electrical energy. Active frequency converters in the excitation systems of electrical machines allow the start-up of units and provide other modes of operation, including using the accumulated kinetic energy. The structure and operating modes of these converters are discussed.

	Automated Design Method for Sine Wave Filters in Motor Drive Applications with SiC-Inverters By Thorben SCHOBRE	[View] [Download]
Abstract: This work describes a design method for sine filters used for servo motor drive applications with a two level voltage source inverters (VSI) with 1200V SiC MOSFETs. To assess the filter effectiveness inattenuating conducted EMI emissions a worst case distortion spectrum of a PWM modulated half bridge midpoint voltage is calculated. The filter and the drive system are transformed to single phase differential (DM) and common mode (CM) equivalent circuits (EQC). The implemented algorithm enables parameter studies with various filter topologies, drive systems and values of filter components. The result of an example parameter study is analyzed and a suitable filter is built up and measured. The measured filter is then compared to the design results and the deviations are discussed.

	Design Flow of a Compact High-Frequency DC/DC Converter with Optimum Average Efficiency in a Wide Operation Range By Maximilian NITZSCHE	[View] [Download]
Abstract: The design of an LLC stage for a wide output voltage range imposes stringent challenges regardingelectrical and thermal performance. To match these requirements this paper presents the design approach and measurements of a resonant LLC converter stage, optimized for a maximum average efficiency over a wide operating range.

	Modeling of Converter Systems Paralleled via Interphase Transformers inCyclic Cascade Topology and Optimization of PWM Carrier Shifts By Duro BASIC	[View] [Download]
Abstract: High power converters can be constructed by paralleling N interleaved converters via InterphaseTransformers (ITRs) to produce multilevel output voltages while minimizing circulating currents amongconverters. With the ITRs connected in cyclical cascade topology, the ITR voltage stress is highlydependent on number of parallel converters and phase shifts between Pulse Width Modulation (PWM)triangular carriers. To analyse the ITR system performance a model of cross-coupling produced by ITRsis needed to establish links between the converter voltages and ITR voltages and cross currentscirculating among converters. The main goal of this paper is to give a comprehensive overview of amodel of the system based on the ITR cyclical cascade topology which can be used for estimation of itsperformance. Based on this model, opportunities for minimisation of the ITR voltages and core losses,via optimization of the converter PWM carrier shifts, are identified and discussed. Application of thetheoretical results is illustrated in an example case with N=5 converters.

	Symmetric and asymmetric operating modes of hybrid cascade frequency converters By Anastasiia STOTCKAIA	[View] [Download]
Abstract: The hybrid cascade frequency converter contains a diode rectifier connected to the network and a three-phase autonomous voltage inverter, as well as a transformer connected in parallel to the network, supplying units with active rectifiers and single-phase voltage inverters. On the load side, three-phase and single-phase inverters are connected in series. The structure of the converter allows to use the transformer for a partial load power, increase the voltage at the output, provide the required quality of voltages and currents at the input and output of the converter, power the load when some of the blocks fail. The model of the converter and investigation results are described. Control algorithms that provide power distribution between the blocks, the required quality of voltages and currents at the input and output, as well as the efficient operation of the converter when disconnecting part of the power blocks are proposed.