3. Related workThere has been an increasing research activity and sur-vey papers on SG communications recently. Several surveyand positional papers on SG can be found in the literature[6–8,4,3].network to support its operations. This communicationsnetwork uses a variety of communications technologies,ranging from wired, such as copper cables, optical fiber,power line carrier, to wireless networks. The crucial com-ponent for communications is between control centersand individual substations.
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