Design and Implementation of IoT Gateway with MQTT and IEC 61850 MMS Protocol

With microgrids deployed in multiple areas, communication technologies that control devices and collect data play an important role. Microgrid environments are similar to the internet of things (IoT) environment, where multiple devices exchange information. Recent studies have attempted to utilize IoT protocols as communication protocols for microgrids. Studies have also begun on interworking IoT protocols with IEC 61850, an existing protocol for power utility. In this study, we designed an IoT gateway that maps message queuing telemetry transport (MQTT), an IoT protocol, to the IEC 61850 data model. We built a testbed and performed a verification using TShark to verify that MQTT and IEC 61850 MMS traffic are properly generated and mapped by the IoT gateway. We also used IEEE 1588 to perform time synchronization between Raspberry Pi units, which are IoT devices. Performance analysis was conducted by measuring the mean transfer time of the MQTT and IEC 61850 MMS traffic for various Ethernet speeds and Wi-Fi protocols