Abstract
The application of Internet-of-Things (IoT) technology in microgrid has converted them into intelligent and efficient systems and facilitated new applications such as smart metering. However, the introduction of these technologies have opened up new opportunities for security attacks that can destabilize the control operation of the power system. In this paper we consider a solar powered IoT-enabled DC microgrid and propose a new design that enhances the security of the communication using TLS 1.3 integrated version of MQTT (Secure-MQTT). We evaluate the design using a hardware based prototype. Results show the design provides communication encryption, integrity, and authentication with minimal impact to performance.