| Abstract: |
| The operation mode of power grids with intermittent distributed generations (DGs) changes frequently due to the
bidirectional power flow. In comparison with the conventional grids, the protection relays in power grids with
micro-sources are more difficult to set. To tackle this problem, this paper proposes an extended bus differential
protection (EBDP) strategy based on the limited wide area (LWA). In this method, the micro-grids are divided into
several protection areas at the core of the bus. The whole protection areas are protected by the wide area current
differential relays, which are also configured to protect each component in this protection area. Moreover, the
protection areas can be changed adaptively according to the power flow direction. Finally, a micro-grid model with
multiple DGs is developed using the PSCAD/EMTDC platform. The simulation results indicate that the proposed
adaptive limited wide area differential protection (LWADP) has better performance than the traditional relaying
protection in detecting the faulty area in micro-grids and isolating the fault, and can be widely utilized in larger
micro-grids. |
| Key words: Micro-sources, Distributed generation (DG), Extended bus differential protection (EBDP), Limited widearea differential protection (LWADP), Micro-grids |
| DOI：10.1186/s41601-017-0052-2 |
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| Fund: |
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