The FREEDM Architecture of Fault Tolerant Network Routing through Software Overlays
نویسندگان
چکیده
Control decisions of intelligent devices in critical infrastructure can have a significant impact on human life and the environment. Insuring that the appropriate data is available is crucial in making informed decisions. Such considerations are becoming increasingly important in today’s cyber-physical systems that combine computational decision making on the cyber side with physical control on the device side. In the FREEDM system, power management of green energy is provided in a highly distributed and scalable manner. The system has to insure that Intelligent Energy Management (IEM) and Intelligent Fault Management devices have the appropriate data to make control decisions for microgrids and with respect of microgrid connectivity to an upstream utility power grid. The job of insuring the timely arrival of the data falls onto the network designed to support these intelligent devices. This network needs to be fault tolerant. When nodes, devices or communication links fail along a default route of a message from A to B, the underlying hardware and software layers should ensure that this message will actually be delivered as long as alternative routes exist. Insuring multi-route pathways and discovery of these pathways is critical in insuring delivery of critical data. In this work, we present methods of developing network topologies of smart devices that will enable multi-route discovery in an intelligent power grid. This will be accomplished through the utilization of software overlays (1) that maintain a digital representation of the physical network and (2) allow new route discovery in the case of fault. Also, in this work we aim to present a visualization of the connection states and pathways through the network aimed at helping external entities to understand the states of the network. Our vision is that the application of this approach in an intelligent power grid will enable IEM and IFM devices to make automated, decentralized decisions and to maintain state of lower-level devices.
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