EPE Association: EPE 2017 - LS2c: High Power Converters

EPE 2017 - LS2c: High Power Converters
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 - LS2c: High Power Converters

   [return to parent folder]

   A Novel Dual Active Bridge Configuration for Wide Voltage Conversion Ratios
By Martin WATTENBERG [View]
[Download]

Abstract: A novel configuration of the dual active bridge (DAB) DC/DC converter is presented, enabling moreefficient wide voltage range conversion at light loads. A third phase leg as well as a center-tapped transformer are introduced to one side of the converter. This concept provides two different turn ratios, thusextending the zero voltage switching operation resulting in higher efficiency. A laboratory prototype wasbuilt converting an input voltage of 40V to an output voltage in the range of 350V to 650V. Measurements show a significant increase up to 20\% in the efficiency for light-load operation.

   Grid-Tie Isolated Bidirectional DC-AC-AC Converter Based on High Frequency Transformer with High Efficiency and Low THD
By Mahmoud ABDALLAH [View]
[Download]

Abstract: This paper presents a new mathematical model and a PWM switching technique for a three-phase grid-tie bidirectional DC-AC converter. The converter topology is designed based on linking an H-bridge to a three-to-single-phase matrix converter through a single-phase high-frequency transformer. The proposed mathematical model uses the trapezoidal waveform approximation for the high-frequency current waveform in order to obtain the accurate duty cycles of all matrix converter switches. The system performance based on trapezoidal approximation is compared with square-wave approximation. Also, the proposed PWM switching technique regulates battery DC current and injects a sinusoidal three-phase current to grid at unity power factor. Therefore, the grid injected current has low total harmonic distortion (THD), and the system overall efficiency is high. The system validity has been verified experimentally using a 200 V/1.8 kW laboratory prototype.

   Implications of Capacitor Voltage Imbalance on the Operation of the Semi-Full-Bridge Submodule
By Stefanie HEINIG [View]
[Download]

Abstract: An investigation of the voltage imbalance of the two capacitors of the semi-full-bridge submodule is performed. Since the capacitances are not exactly the same, there may be a difference between the capacitor voltages. The resulting current-spike when they are connected in parallel has been analyzed in a full-scale laboratory experiment.

   Transformer Design in a Medium Voltage DC/DC Converter for a DC Collection Network
By YU SANG [View]
[Download]

Abstract: DC is regarded as an attractive alternative to conventional AC technology in collection networks forlarge-scale wind and PV generation systems. Playing the role in the stepping up voltage and exportingthe power from the individual generation units, DC/DC converters are one of the most crucial parts ofthe DC collector. Isolated medium-power DC/DC converters would require a medium voltage mediumfrequency (MVMF) transformer. The design of such transformer is not straightforward and several designtrade-offs have to be taken into account in the process. This paper presents a DC/DC convertersolution based on a three-phase single active bridge (SAB) topology for DC collection network, andintroduces its operational principles. After proposing a general modeling and design procedure of theMVMF transformers, this paper compares different parameter choices and their effects on the transformerperformance.

EPE 2017 - LS2c: High Power Converters
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 - LS2c: High Power Converters
	[return to parent folder]

	A Novel Dual Active Bridge Configuration for Wide Voltage Conversion Ratios By Martin WATTENBERG	[View] [Download]
Abstract: A novel configuration of the dual active bridge (DAB) DC/DC converter is presented, enabling moreefficient wide voltage range conversion at light loads. A third phase leg as well as a center-tapped transformer are introduced to one side of the converter. This concept provides two different turn ratios, thusextending the zero voltage switching operation resulting in higher efficiency. A laboratory prototype wasbuilt converting an input voltage of 40V to an output voltage in the range of 350V to 650V. Measurements show a significant increase up to 20\% in the efficiency for light-load operation.

	Grid-Tie Isolated Bidirectional DC-AC-AC Converter Based on High Frequency Transformer with High Efficiency and Low THD By Mahmoud ABDALLAH	[View] [Download]
Abstract: This paper presents a new mathematical model and a PWM switching technique for a three-phase grid-tie bidirectional DC-AC converter. The converter topology is designed based on linking an H-bridge to a three-to-single-phase matrix converter through a single-phase high-frequency transformer. The proposed mathematical model uses the trapezoidal waveform approximation for the high-frequency current waveform in order to obtain the accurate duty cycles of all matrix converter switches. The system performance based on trapezoidal approximation is compared with square-wave approximation. Also, the proposed PWM switching technique regulates battery DC current and injects a sinusoidal three-phase current to grid at unity power factor. Therefore, the grid injected current has low total harmonic distortion (THD), and the system overall efficiency is high. The system validity has been verified experimentally using a 200 V/1.8 kW laboratory prototype.

	Implications of Capacitor Voltage Imbalance on the Operation of the Semi-Full-Bridge Submodule By Stefanie HEINIG	[View] [Download]
Abstract: An investigation of the voltage imbalance of the two capacitors of the semi-full-bridge submodule is performed. Since the capacitances are not exactly the same, there may be a difference between the capacitor voltages. The resulting current-spike when they are connected in parallel has been analyzed in a full-scale laboratory experiment.

	Transformer Design in a Medium Voltage DC/DC Converter for a DC Collection Network By YU SANG	[View] [Download]
Abstract: DC is regarded as an attractive alternative to conventional AC technology in collection networks forlarge-scale wind and PV generation systems. Playing the role in the stepping up voltage and exportingthe power from the individual generation units, DC/DC converters are one of the most crucial parts ofthe DC collector. Isolated medium-power DC/DC converters would require a medium voltage mediumfrequency (MVMF) transformer. The design of such transformer is not straightforward and several designtrade-offs have to be taken into account in the process. This paper presents a DC/DC convertersolution based on a three-phase single active bridge (SAB) topology for DC collection network, andintroduces its operational principles. After proposing a general modeling and design procedure of theMVMF transformers, this paper compares different parameter choices and their effects on the transformerperformance.