NDLI: Demonstration of sustained and useful converter responses during balanced and unbalanced faults in microgrids

Content Provider	IEEE Xplore Digital Library
Author	Roscoe, A.J. Jackson, G. Elders, I.M. McCarthy, J. Burt, G.M.
Copyright Year	2012
Description	Author affiliation: Rolls-Royce PLC, UK (McCarthy, J.) \|\| University of Strathclyde, UK (Roscoe, A.J.; Jackson, G.; Elders, I.M.; Burt, G.M.)
Abstract	In large power grids where converter penetration is presently low and the network impedance is predominantly reactive, the required response from converters during faults is presently specified by phrases such as “maximum reactive output”. However, in marine and aero power systems most faults are unbalanced, the network impedance is resistive, and converter penetration may be high. Therefore a balanced reactive fault current response to an unbalanced fault may lead to over-voltages or over/under frequency events. Instead, this paper presents a method of controlling the converter as a balanced voltage source behind a reactance, thereby emulating the fault response of a synchronous generator (SG) as closely as possible. In this mode there is a risk of converter destruction due to overcurrent. A new way of preventing destruction but still providing fault performance as close to a SG as possible is presented. Demonstrations are presented of simulations and laboratory testing at the 10kVA 400V scale, with balanced and unbalanced faults. Currents can be limited to about 1.5pu while still providing appropriate unbalanced fault response within a resistive network.
Starting Page	1
Ending Page	6
File Size	1588080
Page Count	6
File Format	PDF
ISBN	9781467313704
ISSN	21659427
e-ISBN	9781467313728
e-ISBN	9781467313711
DOI	10.1109/ESARS.2012.6387439
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-16
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage measurement Limiting Current measurement Bridge circuits Switches Time domain analysis Inductors
Content Type	Text
Resource Type	Article

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