EPE Association: EPE 2013 - LS7d: Resonant converters Topologies

EPE 2013 - LS7d: Resonant converters Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 04: Soft switching converters and control > EPE 2013 - LS7d: Resonant converters Topologies

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   Modelling and ZVS Control of an Isolated Three-Phase Bidirectional AC-DC Converter
By Felix JAUCH, Jurgen BIELA [View]
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Abstract: This paper presents an isolated three-phase bidirectional AC-DC converter with a novel modulation strategythat enables Zero-Voltage-Switching (ZVS) for all switches over the whole AC line period. The AC-DCconverter allows the direct coupling of a three-phase AC system with a DC port applying a singlehigh-frequency transformer. A novel modelling approach for the power flows and the derivation of thecontrol variables under ZVS conditions are provided. The design of components including loss modelsand simulation results of a 11 kW electric vehicle battery charger to connect to the 230 Vrms, 50 Hz mainsconsidering a battery voltage range of 380 V to 540 V validate the theoretical analysis.

   Predictive Control of a Direct Resonant Converter with Output Voltage Compensation for High Voltage DC Power Supply Applications
By Eduardo REYES-MORAGA, Alan WATSON, Jon CLARE, Pat WHEELER [View]
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Abstract: This paper presents a zero current switching predictive control strategy for a direct resonant converter which is part of a high voltage power supply. A voltage compensator is used to reduce the output distortion. The direct resonant converter and the voltage compensator consist of a three to single phase matrix converter supplying a series resonant circuit and an H-bridge converter, respectively. Input current, resonant tank capacitor voltage and compensator capacitor voltage are controlled by the predictive approach which selects the optimal switching state to be applied at every zero crossing of the resonant tank current. Since the converter is commutated at the zero current instants, the resonant tank current is controlled via the tank capacitor voltage. Simulation results verify the performance of the system.

   Soft Switching Three Level Inverter (S3L Inverter)
By Manfred W. GEKELER [View]
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Abstract: The Soft Switching Three Level Inverter – abbreviated to S3L Inverter – was first introduced in 2011. It is a novel circuit topology for PWM inverters, whose areas of application include electrical drives and grid-tie inverters for photovoltaic installations and wind power plants, and for power supplies. It is of very simple design and therefore inexpensive. It is implemented completely as soft switching and hence offers very low switching losses. This means that its efficiency is very high, and it can achieve very high values for the switching frequency. This paper begins by describing how the device functions. It then goes on to discuss specialised methods of control. A variant of the S3L Inverter with a deactivatable snubber circuit is presented. A quantitative comparison between a well-known hard switching NPC 3-level inverter and the novel S3L Inverter using 90 kVA (three-phase) prototypes illustrates the advantages of the S3L inverter.

EPE 2013 - LS7d: Resonant converters Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 04: Soft switching converters and control > EPE 2013 - LS7d: Resonant converters Topologies
	[return to parent folder]

	Modelling and ZVS Control of an Isolated Three-Phase Bidirectional AC-DC Converter By Felix JAUCH, Jurgen BIELA	[View] [Download]
Abstract: This paper presents an isolated three-phase bidirectional AC-DC converter with a novel modulation strategythat enables Zero-Voltage-Switching (ZVS) for all switches over the whole AC line period. The AC-DCconverter allows the direct coupling of a three-phase AC system with a DC port applying a singlehigh-frequency transformer. A novel modelling approach for the power flows and the derivation of thecontrol variables under ZVS conditions are provided. The design of components including loss modelsand simulation results of a 11 kW electric vehicle battery charger to connect to the 230 Vrms, 50 Hz mainsconsidering a battery voltage range of 380 V to 540 V validate the theoretical analysis.

	Predictive Control of a Direct Resonant Converter with Output Voltage Compensation for High Voltage DC Power Supply Applications By Eduardo REYES-MORAGA, Alan WATSON, Jon CLARE, Pat WHEELER	[View] [Download]
Abstract: This paper presents a zero current switching predictive control strategy for a direct resonant converter which is part of a high voltage power supply. A voltage compensator is used to reduce the output distortion. The direct resonant converter and the voltage compensator consist of a three to single phase matrix converter supplying a series resonant circuit and an H-bridge converter, respectively. Input current, resonant tank capacitor voltage and compensator capacitor voltage are controlled by the predictive approach which selects the optimal switching state to be applied at every zero crossing of the resonant tank current. Since the converter is commutated at the zero current instants, the resonant tank current is controlled via the tank capacitor voltage. Simulation results verify the performance of the system.

	Soft Switching Three Level Inverter (S3L Inverter) By Manfred W. GEKELER	[View] [Download]
Abstract: The Soft Switching Three Level Inverter – abbreviated to S3L Inverter – was first introduced in 2011. It is a novel circuit topology for PWM inverters, whose areas of application include electrical drives and grid-tie inverters for photovoltaic installations and wind power plants, and for power supplies. It is of very simple design and therefore inexpensive. It is implemented completely as soft switching and hence offers very low switching losses. This means that its efficiency is very high, and it can achieve very high values for the switching frequency. This paper begins by describing how the device functions. It then goes on to discuss specialised methods of control. A variant of the S3L Inverter with a deactivatable snubber circuit is presented. A quantitative comparison between a well-known hard switching NPC 3-level inverter and the novel S3L Inverter using 90 kVA (three-phase) prototypes illustrates the advantages of the S3L inverter.