  In this work, we propose a multi-layer market for vehicle-to-grid energy
trading. In the macro layer, we consider a double auction mechanism, under
which the utility company act as an auctioneer and energy buyers and sellers
interact. This double auction mechanism is strategy-proof and converges
asymptotically. In the micro layer, the aggregators, which are the sellers in
the macro layer, are paid with commissions to sell the energy of plug-in hybrid
electric vehicles (PHEVs) and to maximize their utilities. We analyze the
interaction between the macro and micro layers and study some simplified cases.
Depending on the elasticity of supply and demand, the utility is analyzed under
different scenarios. Simulation results show that our approach can
significantly increase the utility of PHEVs.
