This paper addresses the challenges of integrating existing PHEV charging algorithms, which optimize PHEV charging per market timeslot (e.g. 15 minutes), into an environ- ment with realistic communication conditions. To address this hallenge, we propose a dual coordination mechanism, which controls a cluster of devices on two different operation levels: market operation and real-time operation. The market operation level uses an existing timeslot-based algorithm to calculate a charging schedule per timeslot. The real-time operation level translates this schedule into event-based control actions for a realistic communication environment, wherein a limited number of messages can be exchanged. A case study of 1000 PHEVs shows that it is possible to achieve results on par with the timeslot based algorithm but with significantly reduced communication with the PHEVs
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