In this paper, a false data injection prevention protocol (FDIPP) for smart grid distribution systems is proposed. The protocol is designed to work over a novel hierarchical communication network architecture that matches the distribution system hierarchy and its vast number of entities. The proposed protocol guarantees both system and data integrity via preventing packet injection, duplication, alteration, and rogue node access. Therefore, it prevents service disruption or damaging power network assets due to drawing the wrong conclusions about the current operating status of the power grid. Moreover, the impact of the FDIPP protocol on communication network performance is studied using intensive computer simulations. The simulation study shows that the proposed communication architecture is scalable and meets the packet delay requirements of inter-substation communication as mandated by IEC 61850-90-1 with a minimal packet loss while the security overhead of FDIPP is taken into account.
Supervisory control and data acquisition (SCADA) systems are used extensively to monitor/control utility power distribution networks. However, the current SCADA systems cannot accommodate the demand of smart grid high data rate applications such as asset monitoring using video surveillance for fault prediction and self-healing purposes. Consequently, wireless networking is envisioned as a strong candidate to extend the monitoring capabilities of SCADA systems with easy-to-deploy high data rate devices. Nevertheless, the limited resources of a single wireless network may not allow transferring a large volume of delay-sensitive smart grid information while satisfying the packet delay requirements. This paper investigates, via a hardware measurement-based study, the packet delay performance of multihomed wireless transceivers. Multihomed transceivers are capable of sending different data packets (not packet replicas) over heterogeneous wireless networks simultaneously. The paper also offers a packet delay analysis for dual-homed wireless nodes connected to a WiFi network via one of their interfaces. A comparative experimental and analytical study is conducted for the delay performance of single-interface WiFi transceivers and multihomed transceivers.Our results show that the traffic load distribution among different interfaces has a significant impact on the effectiveness of using multihoming for smart grids.
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