EPE Association: EPE 2013 - LS4d: HVDC/FACTS I

EPE 2013 - LS4d: HVDC/FACTS I
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 16: Power electronics in transmission and distribution > EPE 2013 - LS4d: HVDC/FACTS I

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   A Three-Phase 10 kVAC-750 VDC Power Electronic Transformer for Smart Distribution Grid
By Zixin LI, Ping WANG, Haibin ZHU, Zunfang CHU, Zhandong SUN, Yaohua LI [View]
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Abstract: In this paper, a power electronic transformer (PET) topology for distribution grid is presented based on modular multilevel converter (MMC). The presented topology is of three-phase type and have two dc voltage terminals, i.e. the high-voltage dc terminal and the low-voltage dc terminal. So, it can be connected directly to high-voltage direct current (HVDC) systems and renewable energy systems simultaneously. This feature makes it possible to perform as an “energy router” in smart grids. What is more important, the proposed PET can substantially reduce (by 44.4\% for the studied case) the number of medium frequency transformers (MFTs), compared with the existing solutions. Computer simulation and experimental results on a 10 kV prototype show validity of this PET.

   Energy Diverting Converter Topologies for HVDC Transmission Systems
By Fainan HASSAN, Jose MANEIRO, Sarath TENNAKOON, Carl BARKER [View]
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Abstract: Grid codes imposed by utilities regulate the operation of Voltage Source Converter – High Voltage Direct Current (VSC-HVDC) interconnected offshore wind farms. Fault ride-through (FRT) specifications require the adoption of specific measures to avoid over-voltages of the HVDC link during faults in order to protect the HVDC equipment. Implementing Energy Diverting Converters (EDC), for instance Dynamic Braking Resistor (DBR) circuits, at the DC link is an established method to comply with the grid codes, where the excess energy of the wind farm is diverted into the parallel circuit during the fault. In this paper an evaluation of three different state-of-the-art DBR circuits is performed in order to establish the advantages and disadvantages of each circuit. The evaluation has shown that although the three solutions meet the FRT requirements, the modular topologies generate reduced slope current and voltage step changes during their operation, while being larger in size and requiring a higher number of semiconductors as compared to the traditional DC chopper circuit employing hard switched series connected semiconductor arrangements.

   Power Electronic Voltage Regulator for Increasing the Distributed Generation Capacity in Low Voltage Networks
By Wolfram KRUSCHEL, Jean Patric DA COSTA, Benjamin DOMBERT, Denis MENDE, Thorsten BULO, Peter ZACHARIAS [View]
[Download]

Abstract: Because of the rapid increase of distributed generation, active voltage regulation becomes relevant for low voltage networks. In this paper, several power electronic voltage regulation approaches are presented and compared to each other through a Monte-Carlo-based network analysis. The focus of the investigation is on a series voltage regulator, for which simulation results and experimental results of a prototype are shown.

EPE 2013 - LS4d: HVDC/FACTS I
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 16: Power electronics in transmission and distribution > EPE 2013 - LS4d: HVDC/FACTS I
	[return to parent folder]

	A Three-Phase 10 kVAC-750 VDC Power Electronic Transformer for Smart Distribution Grid By Zixin LI, Ping WANG, Haibin ZHU, Zunfang CHU, Zhandong SUN, Yaohua LI	[View] [Download]
Abstract: In this paper, a power electronic transformer (PET) topology for distribution grid is presented based on modular multilevel converter (MMC). The presented topology is of three-phase type and have two dc voltage terminals, i.e. the high-voltage dc terminal and the low-voltage dc terminal. So, it can be connected directly to high-voltage direct current (HVDC) systems and renewable energy systems simultaneously. This feature makes it possible to perform as an “energy router” in smart grids. What is more important, the proposed PET can substantially reduce (by 44.4\% for the studied case) the number of medium frequency transformers (MFTs), compared with the existing solutions. Computer simulation and experimental results on a 10 kV prototype show validity of this PET.

	Energy Diverting Converter Topologies for HVDC Transmission Systems By Fainan HASSAN, Jose MANEIRO, Sarath TENNAKOON, Carl BARKER	[View] [Download]
Abstract: Grid codes imposed by utilities regulate the operation of Voltage Source Converter – High Voltage Direct Current (VSC-HVDC) interconnected offshore wind farms. Fault ride-through (FRT) specifications require the adoption of specific measures to avoid over-voltages of the HVDC link during faults in order to protect the HVDC equipment. Implementing Energy Diverting Converters (EDC), for instance Dynamic Braking Resistor (DBR) circuits, at the DC link is an established method to comply with the grid codes, where the excess energy of the wind farm is diverted into the parallel circuit during the fault. In this paper an evaluation of three different state-of-the-art DBR circuits is performed in order to establish the advantages and disadvantages of each circuit. The evaluation has shown that although the three solutions meet the FRT requirements, the modular topologies generate reduced slope current and voltage step changes during their operation, while being larger in size and requiring a higher number of semiconductors as compared to the traditional DC chopper circuit employing hard switched series connected semiconductor arrangements.

	Power Electronic Voltage Regulator for Increasing the Distributed Generation Capacity in Low Voltage Networks By Wolfram KRUSCHEL, Jean Patric DA COSTA, Benjamin DOMBERT, Denis MENDE, Thorsten BULO, Peter ZACHARIAS	[View] [Download]
Abstract: Because of the rapid increase of distributed generation, active voltage regulation becomes relevant for low voltage networks. In this paper, several power electronic voltage regulation approaches are presented and compared to each other through a Monte-Carlo-based network analysis. The focus of the investigation is on a series voltage regulator, for which simulation results and experimental results of a prototype are shown.