Reliability Constrained Unit Commitment with Improved V2G Penetration using Hybrid PSOGSA

Vehicle to grid is a new technology which is integrating huge amount of electric vehicles as modern energy storage into the electric utility grid. Plug in electric vehicles have bidirectional energy flow i.e. they can either inject power to grid or draw from it. Vehicles are charged at off peak time and they discharge their power at peak time which is acting as a spinning reserve. Thus it reduces the dependency on small expensive units , optimizing the fluctuation of the load curve and also reduces the emission. Reliability constrained unit commitment is applied to minimize the cost economically and schedule unit reserves like spinning reserves to provide system reliability. In this paper unit commitment is a master problem assigning on/off state of generating units and at the next step the sub problem solves the economic dispatch and finally the reliability issues. Reliability issues are considered as spinning reserves and the ability of the power system under study to supply loads. HPSOGSA is used to solve the unit commitment problem.