英国工程技术协会
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作者:A.A. Aboushady , K.H. Ahmed , D. Jovcic
来源:[C].11th IET International Conference on AC and DC Power Transmission2015IET
摘要:This paper focuses on the behaviour of the cell capacitor discharge currents during DC faults in half-bridge modular multilevel converters. Active switches, not designed for fault conditions, are tripped to minimize discharge currents effect on the semiconductor switches. Two lev...
作者:Weixing Lin , D. Jovcic
来源:[C].11th IET International Conference on AC and DC Power Transmission2015IET
摘要:As the future DC grids will involve numerous converter systems, the accuracy and speed of their modeling becomes of high importance. The modelling in a rotating dq frame is able to transform the quantities from ac variables to dc variables resulting in a significantly improved si...
作者:S.M. Fazeli , D. Jovcic , Weixing Lin
来源:[C].11th IET International Conference on AC and DC Power Transmission2015IET
摘要:The multiport LCL dc hub is a high power electronic dc substation used to interconnect multiple dc systems in the future dc transmission grids. This paper proposes a distributed power balance controller for high power multiport LCL DC hub. The hub controller follows dispatcher de...
作者:D. Jovcic , M. Hajian , L. Zhang
来源:[C].10th IET International Conference on AC and DC Power Transmission (ACDC 2012)2012IET
摘要:The introduction of HVDC light technology has been a significant step towards developing DC transmission grids. However, all voltage source converters (VSC) employed with HVDC are completely defenceless against DC faults, and significant further technical advances are required to...
作者:D. Jovcic , M. Hajian ...
来源:[C].10th IET International Conference on AC and DC Power Transmission (ACDC 2012)2012IET
摘要:DC power flow can be controlled though N-1 different DC lines/cables in a DC grid having N individual AC/DC converters. A large meshed DC grid can have more DC lines, and since we can not control power in all lines/cables, an overload may result. In this paper, two methods are pr...
作者:... D.E. Macpherson , W. Blewitt , D. Jovcic
来源:[C].6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012)2012IET
摘要:This paper compares six DC/DC converter topologies for offshore wind HVDC applications. The topologies include five conventional transformer based topologies and one novel transformerless topology. Detailed models of the DC/DC converters are simulated using PLECS, and the compone...
作者:D. Jovcic
来源:[C].Seventh International Conference on AC and DC Transmission2001IET
摘要:This paper studies dynamic aspects of HVDC system operation with long DC cables. The eigenvalue analysis of CIGRE HVDC system with extended DC cable is presented. It is concluded that significant aggravation in the system stability is present with cables of 1000 km and the system...
作者:D. Jovcic
来源:[C].8th IEE International Conference on AC and DC Power Transmission (ACDC 2006)2006IET
摘要:This paper studies a novel converter configuration for HVDC systems. The converter is based on a resonant circuit and the forced commutation principle, which enables thyristor commutation to be independent of the AC voltage. The theoretical analysis elaborates the methods for cal...
作者:D. Jovcic , J.V. Milanovic
来源:[C].8th IEE International Conference on AC and DC Power Transmission (ACDC 2006)2006IET
摘要:This paper studies a large offshore wind farm interconnected to the grid using a multiterminal HVDC link. The 200 W wind farm consists of 100 individual 2 MW turbines connected using 25 CSI (current source inverters) to a common DC link. Since The CSI converters are in series con...

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