  This paper focuses on the secure integration of distributed energy resources
(DERs), especially pluggable electric vehicles (EVs), with the power grid. We
consider the vehicle-to-grid (V2G) system where EVs are connected to the power
grid through an aggregator. In this paper, we propose a novel Cyber-Physical
Anomaly Detection Engine that monitors system behavior and detects anomalies
almost instantaneously. This detection engine ensures that the critical power
grid component (viz.,aggregator)remains secure by monitoring(a)cyber messages
for various state changes and data constraints along with (b)power data on the
V2G cyber network using power measurements from sensors on the physical/power
distribution network. Since the V2G system is time-sensitive, the anomaly
detection engine also monitors the timing requirements of the protocol messages
to enhance the safety of the aggregator. To the best of our knowledge, this is
the first piece of work that combines(a)the EV charging/discharging protocols,
the(b)cyber network and(c)power measurements from physical network to detect
intrusions in the EV to power grid system.
