Unit commitment in power systems with plug-in hybrid electric vehicles

摘要

With the continued development of renewable energy generation technologies and increasing pressure toncombat the global effects of greenhouse warming, plug-in hybrid electric vehicles (PHEVs) have receivednworldwide attention, finding applications in North America and Europe. When a large number of PHEVsnare introduced into a power system, there will be extensive impacts on power system planning andnoperation, as well as on electricity market development. It is therefore necessary to properly control PHEVncharging and discharging behaviors. Given this background, a new unit commitment model and its solutionnmethod that takes into account the optimal PHEV charging and discharging controls is presented in thisnpaper. A 10-unit and 24-hour unit commitment (UC) problem is employed to demonstrate the feasibilitynand efficiency of the developed method, and the impacts of the wide applications of PHEVs on the operatingncosts and the emission of the power system are studied. Case studies are also carried out to investigate thenimpacts of different PHEV penetration levels and different PHEV charging modes on the results of the UCnproblem. A 100-unit system is employed for further analysis on the impacts of PHEVs on the UC problemnin a larger system application. Simulation results demonstrate that the employment of optimized PHEVncharging and discharging modes is very helpful for smoothing the load curve profile and enhancing thenability of the power system to accommodate more PHEVs. Furthermore, an optimal Vehicle to Gridn(V2G) discharging control provides economic and efficient backups and spinning reserves for the securenand economic operation of the power system. Copyright © 2012 John Wiley & Sons, Ltd.