EPE Association: EPE 2017 - DS3c: Advanced Power Converter Topologies III

EPE 2017 - DS3c: Advanced Power Converter Topologies III
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 02: Power Converter Topologies and Design > EPE 2017 - DS3c: Advanced Power Converter Topologies III

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   All-SiC 5 kW/50 kHz Three-Phase Hybrid Rectifier with Reduced Input Current Harmonics
By Krzysztof GEDROYC [View]
[Download]

Abstract: This paper provides conclusions on design and laboratory tests of a hybrid recti_er prototype whichemploys the newest generation of SiC transistors and diodes. For the presented hardware prototype theAC-DC ef_ciency is about 98\%. Based on simulation analysis and the practical realization pros and consof this topology were identi_ed. It should be noted that hybrid recti_ers importance is growing becauseof their unique features such as: its natural short circuit robustness and protection therefore a dead timeis not needed. Moreover, these features are available with a relatively simple control method.

   Analysis and design of a series resonant converter with wide operating range and minimized transformer ratings
By Catalin DINCAN [View]
[Download]

Abstract: This paper is introducing a new method of operation for a series resonant converter, with intended application in megawatt high voltage DC wind turbines. Compared to a frequency-controlled series resonant converter operated in sub-resonant mode, the new method (entitled pulse removal technique) allows the transformer design to be determined by peak load and maximum switching frequency, while still avoiding over-excitation at reduced load and reduced excitation frequency. This promises transformer size reduction of more than 50\%, while losses are kept below 1\% from zero to nominal power. A step by step design procedure is proposed and circuit component ratings and efficiency are compared for two variants.

   Application of DC/DC/AC dual voltage source inverter for current harmonics reduction in PMSM drive
By Lukasz NIEWIARA [View]
[Download]

Abstract: In this paper a dual DC/DC/AC inverter with discrete non-stationary state feedback controller ispresented. Neural network based control algorithm is proposed to optimal control of PMSM drive. Theconsidered converter topology and designed control structure with discrete state feedback controllerssignificantly reduces the harmonics content in phase currents.

   Combined Voltage Balancing Techniques of the DC Link in Five-Level Medium Voltage NPC Back-to-Back Converters for Offshore Renewable Generation
By Georgios MADEMLIS [View]
[Download]

Abstract: The voltage balancing of the dc-link capacitors in an electric drive system with five-level neutral-point-clamped converters is investigated in this paper. A properly modified space-vector-modulation technique is utilized in combination with a multilevel dc/dc converter for controlling the capacitor voltages. An advanced algorithm has been developed for reducing the losses of the electric drive system and for ensuring that the capacitor voltages are balanced in every operating condition. The developed electric drive system can be used in offshore power plants for driving medium voltage generators. Selective simulation results are presented to validate the theoretical considerations.

   Comparative analysis of GaN HEMT vs. Si CoolMOS for a High-Frequency MMC Topology
By ANDER AVILA [View]
[Download]

Abstract: The performance of a Modular Multilevel Converter (MMC) is presented in this paper, comparing Silicon(Si) and Gallium Nitride (GaN) semiconductors. Moreover, the benefits of high-frequency operation ina MMC topology are analysed along with a power loss distribution evaluation, highlighting the mainadvantages and drawbacks of different semiconductor technologies.

   High Performance Voltage-Sensorless Model Predictive Control for Grid Integration of Packed U Cells based PV System
By Mohamed TRABELSI [View]
[Download]

Abstract: The current energy constraints are pushing researchers to design and optimize power electronic devices for integrating and consuming renewable energy more efficiently. In this paper, a voltage sensorless Model Predictive Control (MPC) solution is proposed for the grid integration of a Packed U Cells (PUC) based PV system. The studied topology is a grid-connected 4-cell 15-level PUC inverter. The control scheme is based on an adaptive observer allowing the appropriate estimation of the capacitors' voltages at each sampling time using the measured grid current. The estimated voltages are then fed to a multi-objective MPC algorithm ensuring the simultaneous regulation of the capacitors' voltages and grid current with low THD. Theoretical analysis and simulation results are given to show the high performance of the proposed solution.

   Improving Passive Current Sharing in Multiphase Active-Clamp Flyback Converter with High Step-up Ratio
By Jacinto JIMENEZ-MARTINEZ [View]
[Download]

Abstract: Output impedance of active-clamp converters is a valid method to achieve current sharing among parallel-connected power stages. Nevertheless, parasitic capacitances result in resonances that modify converter behavior and current balance. A solution is presented and validated. The current balance is achieved without a dedicated control.

   Modular power converter with superconducting magnetic energy storage for electric power distribution system - analysis and simulation
By Marcin PARCHOMIUK [View]
[Download]

Abstract: This paper describes selected issues concerningrealization of energy storage system (ESS) designed to operate inpower distribution system. This paper presents a modularapproach of 300 kVA power converter operating withsuperconducting magnetic energy storage (SMES), which giveshigh dynamics together with high power and suitable capabilityfor instantaneous energy storage. Analysis and simulationstudies of selected power converter topologies are conducted,which are also commonly used to connect electric powerdistribution system and energy storage system. In order to verifyassumed technical parameters, a single prototype of ESS ispresented together with experimental results. Proposed solutionsupports scalability of the system in power as well as in energystorage capacity of ESS. Presented full scale prototype module isa result of conducted analysis and proposition for futurerenewable energy storage installations.

   Quasi-resonant DC-link voltage inverter with enhanced zero-voltage switching control
By Marek TURZYNSKI [View]
[Download]

Abstract: A new topology modification of the parallel quasi-resonant circuit for a dc-link voltage inverter enables regulation of the zero voltage dc-link subperiods and the dc-link voltage gradient settings. The proposed circuit is based on four MOSFET switches with free-wheeling diodes for controlled quasi-resonant recharging between L-C tank in order to assure inverter zero voltage switching (ZVS) conditions. Design optimization of the prototype quasi-resonant inverter and timing sequences for common mode voltage reduction are described. Preliminary experimental results confirm precise controllability of the inverter ZVS operation.

   Switch yard and isolation control design for DC/AC/DC converter operating at power reversal condition in LCC-HVDC system
By Chuanyue LI [View]
[Download]

Abstract: As one type of the interconnected device between HVDC systems, the DC/AC/DC converter is able toachieve high-voltage connection and bulk-power transportation, which makes this device fit theinterconnection of LCC-HVDCs. To achieve an efficient interconnected LCC-HVDC system, theDC/AC/DC converter is possible to operate under the condition that one LCC-HVDC runs at normaloperation and the other at the operation of power reversal. This requests the DC/AC/DC converter toregulate power in terms of the interconnection between positive voltage and the negative. Consideringthe economy of the interconnection, the DC/AC/DC converter uses half-bridge sub-modules, which isnot able to connect the negative-voltage system. To achieve the ability of negative-voltage connection,a switch yard is proposed to reverse the voltage polarity of DC/AC/DC converter. And a controlsystem of the DC/AC/DC converter is proposed to protect the normal LCC-HVDC from the influenceof LCC-HVDC during power reversal.

EPE 2017 - DS3c: Advanced Power Converter Topologies III
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 02: Power Converter Topologies and Design > EPE 2017 - DS3c: Advanced Power Converter Topologies III
	[return to parent folder]

	All-SiC 5 kW/50 kHz Three-Phase Hybrid Rectifier with Reduced Input Current Harmonics By Krzysztof GEDROYC	[View] [Download]
Abstract: This paper provides conclusions on design and laboratory tests of a hybrid recti_er prototype whichemploys the newest generation of SiC transistors and diodes. For the presented hardware prototype theAC-DC ef_ciency is about 98\%. Based on simulation analysis and the practical realization pros and consof this topology were identi_ed. It should be noted that hybrid recti_ers importance is growing becauseof their unique features such as: its natural short circuit robustness and protection therefore a dead timeis not needed. Moreover, these features are available with a relatively simple control method.

	Analysis and design of a series resonant converter with wide operating range and minimized transformer ratings By Catalin DINCAN	[View] [Download]
Abstract: This paper is introducing a new method of operation for a series resonant converter, with intended application in megawatt high voltage DC wind turbines. Compared to a frequency-controlled series resonant converter operated in sub-resonant mode, the new method (entitled pulse removal technique) allows the transformer design to be determined by peak load and maximum switching frequency, while still avoiding over-excitation at reduced load and reduced excitation frequency. This promises transformer size reduction of more than 50\%, while losses are kept below 1\% from zero to nominal power. A step by step design procedure is proposed and circuit component ratings and efficiency are compared for two variants.

	Application of DC/DC/AC dual voltage source inverter for current harmonics reduction in PMSM drive By Lukasz NIEWIARA	[View] [Download]
Abstract: In this paper a dual DC/DC/AC inverter with discrete non-stationary state feedback controller ispresented. Neural network based control algorithm is proposed to optimal control of PMSM drive. Theconsidered converter topology and designed control structure with discrete state feedback controllerssignificantly reduces the harmonics content in phase currents.

	Combined Voltage Balancing Techniques of the DC Link in Five-Level Medium Voltage NPC Back-to-Back Converters for Offshore Renewable Generation By Georgios MADEMLIS	[View] [Download]
Abstract: The voltage balancing of the dc-link capacitors in an electric drive system with five-level neutral-point-clamped converters is investigated in this paper. A properly modified space-vector-modulation technique is utilized in combination with a multilevel dc/dc converter for controlling the capacitor voltages. An advanced algorithm has been developed for reducing the losses of the electric drive system and for ensuring that the capacitor voltages are balanced in every operating condition. The developed electric drive system can be used in offshore power plants for driving medium voltage generators. Selective simulation results are presented to validate the theoretical considerations.

	Comparative analysis of GaN HEMT vs. Si CoolMOS for a High-Frequency MMC Topology By ANDER AVILA	[View] [Download]
Abstract: The performance of a Modular Multilevel Converter (MMC) is presented in this paper, comparing Silicon(Si) and Gallium Nitride (GaN) semiconductors. Moreover, the benefits of high-frequency operation ina MMC topology are analysed along with a power loss distribution evaluation, highlighting the mainadvantages and drawbacks of different semiconductor technologies.

	High Performance Voltage-Sensorless Model Predictive Control for Grid Integration of Packed U Cells based PV System By Mohamed TRABELSI	[View] [Download]
Abstract: The current energy constraints are pushing researchers to design and optimize power electronic devices for integrating and consuming renewable energy more efficiently. In this paper, a voltage sensorless Model Predictive Control (MPC) solution is proposed for the grid integration of a Packed U Cells (PUC) based PV system. The studied topology is a grid-connected 4-cell 15-level PUC inverter. The control scheme is based on an adaptive observer allowing the appropriate estimation of the capacitors' voltages at each sampling time using the measured grid current. The estimated voltages are then fed to a multi-objective MPC algorithm ensuring the simultaneous regulation of the capacitors' voltages and grid current with low THD. Theoretical analysis and simulation results are given to show the high performance of the proposed solution.

	Improving Passive Current Sharing in Multiphase Active-Clamp Flyback Converter with High Step-up Ratio By Jacinto JIMENEZ-MARTINEZ	[View] [Download]
Abstract: Output impedance of active-clamp converters is a valid method to achieve current sharing among parallel-connected power stages. Nevertheless, parasitic capacitances result in resonances that modify converter behavior and current balance. A solution is presented and validated. The current balance is achieved without a dedicated control.

	Modular power converter with superconducting magnetic energy storage for electric power distribution system - analysis and simulation By Marcin PARCHOMIUK	[View] [Download]
Abstract: This paper describes selected issues concerningrealization of energy storage system (ESS) designed to operate inpower distribution system. This paper presents a modularapproach of 300 kVA power converter operating withsuperconducting magnetic energy storage (SMES), which giveshigh dynamics together with high power and suitable capabilityfor instantaneous energy storage. Analysis and simulationstudies of selected power converter topologies are conducted,which are also commonly used to connect electric powerdistribution system and energy storage system. In order to verifyassumed technical parameters, a single prototype of ESS ispresented together with experimental results. Proposed solutionsupports scalability of the system in power as well as in energystorage capacity of ESS. Presented full scale prototype module isa result of conducted analysis and proposition for futurerenewable energy storage installations.

	Quasi-resonant DC-link voltage inverter with enhanced zero-voltage switching control By Marek TURZYNSKI	[View] [Download]
Abstract: A new topology modification of the parallel quasi-resonant circuit for a dc-link voltage inverter enables regulation of the zero voltage dc-link subperiods and the dc-link voltage gradient settings. The proposed circuit is based on four MOSFET switches with free-wheeling diodes for controlled quasi-resonant recharging between L-C tank in order to assure inverter zero voltage switching (ZVS) conditions. Design optimization of the prototype quasi-resonant inverter and timing sequences for common mode voltage reduction are described. Preliminary experimental results confirm precise controllability of the inverter ZVS operation.

	Switch yard and isolation control design for DC/AC/DC converter operating at power reversal condition in LCC-HVDC system By Chuanyue LI	[View] [Download]
Abstract: As one type of the interconnected device between HVDC systems, the DC/AC/DC converter is able toachieve high-voltage connection and bulk-power transportation, which makes this device fit theinterconnection of LCC-HVDCs. To achieve an efficient interconnected LCC-HVDC system, theDC/AC/DC converter is possible to operate under the condition that one LCC-HVDC runs at normaloperation and the other at the operation of power reversal. This requests the DC/AC/DC converter toregulate power in terms of the interconnection between positive voltage and the negative. Consideringthe economy of the interconnection, the DC/AC/DC converter uses half-bridge sub-modules, which isnot able to connect the negative-voltage system. To achieve the ability of negative-voltage connection,a switch yard is proposed to reverse the voltage polarity of DC/AC/DC converter. And a controlsystem of the DC/AC/DC converter is proposed to protect the normal LCC-HVDC from the influenceof LCC-HVDC during power reversal.