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The future smart grid is envisioned as a network of interconnected microgrids(MGs) - small-scale local power networks comprising generators, storagecapacities and loads. MGs bring unprecedented modularity, efficiency,sustainability, and resilience to the power grid as a whole. Due to the highshare of renewable generation, MGs require innovative concepts for control andoptimization, giving rise to a novel class of smart energy applications, inwhich communications represent an integral part. In this paper, we review powertalk, a communication technique specifically developed for direct current MGs,which exploits the communication potential residing within the MG powerequipment. Depending on the smart energy application, power talk can be usedeither as a primary communication enabler, or an auxiliary communication systemthat provides resilient and secure operation. The key advantage of power talkis that it derives its availability, reliability, and security from the very MGelements, outmatching standard, off-the shelf communication solutions.

Secure and Resilient Low-Rate Connectivity for Smart Energy Applications through Power Talk in DC Microgrids