The Experts below are selected from a list of 29496 Experts worldwide ranked by ideXlab platform
Stephen Jon Finney - One of the best experts on this subject based on the ideXlab platform.
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New Efficient Submodule for a Modular Multilevel Converter in Multiterminal HVDC Networks
IEEE Transactions on Power Electronics, 2017Co-Authors: Grain Philip Adam, Derrick Holliday, Ibrahim Abdelsalam, John Edward Fletcher, Graeme M. Burt, Stephen Jon FinneyAbstract:In high-voltage applications, the magnitude of total semiconductor losses (on-state and switching) determines the viability of modular-type multilevel converters. Therefore, this paper presents a new cell arrangement that aims to lower total semiconductor loss of the modular multilevel converter (MMC) to less than that of the half-bridge modular multilevel converter (HB-MMC). Additional attributes of the proposed cell are: it eliminates the protective thyristors used in conventional half-bridge cells that deviate part of the dc-fault current away from the antiparallel diode of the main switch when the converter is blocked during a dc short-circuit fault, and it can facilitate Continued Operation of the MMC during cell failures without the need for a mechanical bypass switch. Thus, the MMC that uses the proposed cell retains all advantages of the HB-MMC such as full modularity of the power circuit and internal fault management. The claimed attributes of the proposed cell are verified using illustrative simulations and reduced scale experimentations. Additionally, this paper provides brief and critical discussions that highlight the attributes and limitations of popular MMC control methods and different MMC cells structures proposed in the literature, considering the power electronic system perspective.
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Continued Operation of multi-terminal HVDC networks based on modular multilevel converters
2014Co-Authors: G. P. Ased, Stephen Jon Finney, Derrick Holliday, K. Kuroda, R. Yamamoto, H ItoAbstract:A comprehensive study that explores the possibility of using passive networks and active converter control to facilitate Continued Operation of multi-terminal HVDC networks with minimum interruption during pole-to-pole dc short-circuit faults is presented. The primary objective of this study is to achieve Continued Operation of any multi-terminal HVDC network using relatively slow dc circuit breakers (with minimum Operation time of 10ms), without over-stressing converter switches and without converter dc link voltages falling below the peak ac line voltage. The validity of the proposed method is confirmed using time-domain simulations. Results obtained from iterative simulations confirm the possibility of further extension of fault clearance time to more than 10ms, but at the expense of increased passive component size.
Nancy E Westcott - One of the best experts on this subject based on the ideXlab platform.
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Continued Operation of a 25 raingage network for collection reduction and analysis of precipitation data for lake michigan diversion accounting water year 2005
2006Co-Authors: Nancy E WestcottAbstract:A dense raingage network has operated in Cook County since the fall of 1989, to provide accurate precipitation measurements for use in simulating runoff for Lake Michigan diversion accounting. This report describes the network design, the Operations and maintenance procedures, the data reduction and quality control methodology, a comparison of rainfall amounts obtained via analog chart and data logger, and an analysis of precipitation for Water Year 2005 (October 2004 September 2005). The data analyses include 1) monthly and Water Year 2005 amounts at all sites, 2) Water Year 2005 amounts in comparison to patterns from network Water Years 1990-2004, and 3) the 16-year network precipitation average for Water Years 19902005. Also included are raingage site descriptions, instructions for raingage technicians, documentation of raingage maintenance, and documentation of high storm totals.
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Continued Operation of a 25 raingage network for collection reduction and analysis of precipitation data for lake michigan diversion accounting water year 2004
2005Co-Authors: Nancy E WestcottAbstract:"Final report to U.S. Army Corps of Engineers, Chicago District and U.S. Army Construction Engineering Research Lab."
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Continued Operation of a 25 raingage network for collection reduction and analysis of precipitation data for lake michigan diversion accounting water year 2002
2003Co-Authors: Nancy E WestcottAbstract:"Final report to the U.S. Army Corps of Engineers, Chicago District and U.S. Geological Survey."
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Continued Operation of a 25 raingage network for collection reduction and analysis of precipitation data for lake michigan diversion accounting water year 2000
2001Co-Authors: Nancy E WestcottAbstract:"Final report to the U.S. Army Corps of Engineers, Chicago District and U.S. Geological Survey and Mead and Hunt."
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Continued Operation of a raingage network for collection reduction and analysis of precipitation data for lake michigan diversion accounting water year 1995
1996Co-Authors: Nancy E WestcottAbstract:"Final report to the U.S. Army Corps of Engineers, Chicago District and U.S. Geological Survey on contracts DACW 23-92-C-0019 and 1434-95-C-30251."
Derrick Holliday - One of the best experts on this subject based on the ideXlab platform.
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New Efficient Submodule for a Modular Multilevel Converter in Multiterminal HVDC Networks
IEEE Transactions on Power Electronics, 2017Co-Authors: Grain Philip Adam, Derrick Holliday, Ibrahim Abdelsalam, John Edward Fletcher, Graeme M. Burt, Stephen Jon FinneyAbstract:In high-voltage applications, the magnitude of total semiconductor losses (on-state and switching) determines the viability of modular-type multilevel converters. Therefore, this paper presents a new cell arrangement that aims to lower total semiconductor loss of the modular multilevel converter (MMC) to less than that of the half-bridge modular multilevel converter (HB-MMC). Additional attributes of the proposed cell are: it eliminates the protective thyristors used in conventional half-bridge cells that deviate part of the dc-fault current away from the antiparallel diode of the main switch when the converter is blocked during a dc short-circuit fault, and it can facilitate Continued Operation of the MMC during cell failures without the need for a mechanical bypass switch. Thus, the MMC that uses the proposed cell retains all advantages of the HB-MMC such as full modularity of the power circuit and internal fault management. The claimed attributes of the proposed cell are verified using illustrative simulations and reduced scale experimentations. Additionally, this paper provides brief and critical discussions that highlight the attributes and limitations of popular MMC control methods and different MMC cells structures proposed in the literature, considering the power electronic system perspective.
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Continued Operation of multi-terminal HVDC networks based on modular multilevel converters
2014Co-Authors: G. P. Ased, Stephen Jon Finney, Derrick Holliday, K. Kuroda, R. Yamamoto, H ItoAbstract:A comprehensive study that explores the possibility of using passive networks and active converter control to facilitate Continued Operation of multi-terminal HVDC networks with minimum interruption during pole-to-pole dc short-circuit faults is presented. The primary objective of this study is to achieve Continued Operation of any multi-terminal HVDC network using relatively slow dc circuit breakers (with minimum Operation time of 10ms), without over-stressing converter switches and without converter dc link voltages falling below the peak ac line voltage. The validity of the proposed method is confirmed using time-domain simulations. Results obtained from iterative simulations confirm the possibility of further extension of fault clearance time to more than 10ms, but at the expense of increased passive component size.
Grain Philip Adam - One of the best experts on this subject based on the ideXlab platform.
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New Efficient Submodule for a Modular Multilevel Converter in Multiterminal HVDC Networks
IEEE Transactions on Power Electronics, 2017Co-Authors: Grain Philip Adam, Derrick Holliday, Ibrahim Abdelsalam, John Edward Fletcher, Graeme M. Burt, Stephen Jon FinneyAbstract:In high-voltage applications, the magnitude of total semiconductor losses (on-state and switching) determines the viability of modular-type multilevel converters. Therefore, this paper presents a new cell arrangement that aims to lower total semiconductor loss of the modular multilevel converter (MMC) to less than that of the half-bridge modular multilevel converter (HB-MMC). Additional attributes of the proposed cell are: it eliminates the protective thyristors used in conventional half-bridge cells that deviate part of the dc-fault current away from the antiparallel diode of the main switch when the converter is blocked during a dc short-circuit fault, and it can facilitate Continued Operation of the MMC during cell failures without the need for a mechanical bypass switch. Thus, the MMC that uses the proposed cell retains all advantages of the HB-MMC such as full modularity of the power circuit and internal fault management. The claimed attributes of the proposed cell are verified using illustrative simulations and reduced scale experimentations. Additionally, this paper provides brief and critical discussions that highlight the attributes and limitations of popular MMC control methods and different MMC cells structures proposed in the literature, considering the power electronic system perspective.
John Edward Fletcher - One of the best experts on this subject based on the ideXlab platform.
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New Efficient Submodule for a Modular Multilevel Converter in Multiterminal HVDC Networks
IEEE Transactions on Power Electronics, 2017Co-Authors: Grain Philip Adam, Derrick Holliday, Ibrahim Abdelsalam, John Edward Fletcher, Graeme M. Burt, Stephen Jon FinneyAbstract:In high-voltage applications, the magnitude of total semiconductor losses (on-state and switching) determines the viability of modular-type multilevel converters. Therefore, this paper presents a new cell arrangement that aims to lower total semiconductor loss of the modular multilevel converter (MMC) to less than that of the half-bridge modular multilevel converter (HB-MMC). Additional attributes of the proposed cell are: it eliminates the protective thyristors used in conventional half-bridge cells that deviate part of the dc-fault current away from the antiparallel diode of the main switch when the converter is blocked during a dc short-circuit fault, and it can facilitate Continued Operation of the MMC during cell failures without the need for a mechanical bypass switch. Thus, the MMC that uses the proposed cell retains all advantages of the HB-MMC such as full modularity of the power circuit and internal fault management. The claimed attributes of the proposed cell are verified using illustrative simulations and reduced scale experimentations. Additionally, this paper provides brief and critical discussions that highlight the attributes and limitations of popular MMC control methods and different MMC cells structures proposed in the literature, considering the power electronic system perspective.