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Approaches to network protection for inverter dominated electrical distribution systems

Tumilty, R. and Brucoli, M. and Burt, G.M. and Green, T. (2006) Approaches to network protection for inverter dominated electrical distribution systems. In: 3rd IET International Conference on Power Electronics, Machines and Drives, 2006-04-04 - 2006-04-06.

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The use of the micro-grid paradigm with extensive inverter interfaced generation raises the problem of severely restricted fault levels when operating in a power island. This paper presents a review of the conventional distribution network protection practices and then discusses their limitations when applied to inverter dominated micro-grids. The use of voltage measurement based fault detection is considered and is followed by consideration of how to apply this technique in conjunction with an adaptive form of protection. A potential solution for small micro-grids is presented in the form of voltage controlled overcurrent devices to enable the use of lower current threshold settings. Key issues for the design of network protection within micro-grids are summarised