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Information and Communication Technology (ICT) infrastructures play a keyrole in the evolution from traditional power systems to Smart Grids.Increasingly fluctuating power flows, sparked by the transition towardssustainable energy generation, become a major issue for power grid stability.To deal with this challenge, future Smart Grids require precise monitoring andcontrol, which in turn demand for reliable, real-time capable andcost-efficient communications. For this purpose, we propose applyingSoftware-Defined Networking (SDN) to handle the manifold requirements of SmartGrid communications. To achieve reliability, our approach encompasses fastrecovery after failures in the communication network and dynamic service-awarenetwork (re-)configuration. Network Calculus (NC) logic is embedded into ourSDN controller for meeting latency requirements imposed by the standard IEC61850 of the International Electrotechnical Committee (IEC). Thus, routingprovides delay-optimal paths under consideration of existing cross traffic.Also, continuous latency bound compliance is ensured by combining NC delaysupervision with means of flexible reconfiguration. For evaluation we considerthe well-known Nordic 32 test system, on which we map a correspondingcommunication network in both experiment and emulation. The describedfunctionalities are validated, employing realistic IEC 61850 transmissions anddistributed control traffic. Our results show that hard service guarantees canbe ensured with the help of the proposed SDN solution. On this basis, we deriveextremely time critical services, which must not be subjected to flexiblereconfiguration.

Enabling Hard Service Guarantees in Software-Defined Smart Grid Infrastructures