Abstarct: . Abstract: Nowadays, the electric vehicles (EVs) have gained the great attention due to the decrease of fossil fuel resources and increase of greenhouse gas emissions. Increasing the EVs in recent years provide a special opportunity to support the power network. In this regard the salient characteristics of EVs such as considerable energy storage, fast response, quite high EV availability and etc. are of a great importance. The EVs can be supposed as a provider of ancillary services such as frequency regulation, reactive power control and spinning reserve in modern power system. The ability of EVs to control the frequency of the system is investigated in this thesis. An intensive management of sparse EVs in the network and scheduling for using the extra charge of EV batteries are attractive issues to smart grid experts. Therefore an independent entity is offered to aggregate all EVs and manage them to present charging services in spinning reserve market. The aim of the aggregator of electric vehicles is gaining the maximum profit by self-scheduling to participate in the reserve market. The EVs are embedded in a three bus islanded power network and provide the auxiliary frequency control service after a typical disturbance. A MATLAB/Simulixnk baxsed simulation confirms the ability of EVs to damp the frequency fluctuations with respect to providing spinning reserve.