A Protection Strategy for Micro-Grids Based on Positive-Sequence Impedance
DOI:
https://doi.org/10.13052/dgaej2156-3306.3131Keywords:
Micro-grid protection, grid-connected mode, islanded mode, positive-sequence component.Abstract
In recent years, the concept of micro-grid has appeared as an appropriate way for the integration of Distributed Energy Resources (DERs)
in the distribution networks. However, micro-grids have encountered
a number of challenges from control and protection aspects. One of the
main issues relevant to the protection of micro-grids is to develop a suitable protection technique which is effective in both grid-connected and
stand-alone operation modes. This article presents a new micro-grid
protection strategy based on positive-sequence impedance using Phasor Measurement Units (PMUs) and a designed Microprocessor-Based
Relay (MBR) along with a narrowband communication system (only to
exchange digital information, not electrical power). The main attribution
of the proposed scheme is that it has the ability to protect micro-grids
containing either radial or looped feeders; additionally, the capabilities of automatic updating of pick-up threshold value and single-phase
tripping have been considered in the designed MBR. Finally, in order to
verify the effectiveness of the suggested scheme and the designed MBR,
several simulations have been undertaken by using DIgSILENT PowerFactory and Matlab software packages.
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