Reliability Assessment of Composite Power System With Large-Scale Grid-Integration of Plug-in Hybrid Electric Vehicles

In view of the randomness of electric vehicles(EV) charging,the large-scale grid-integration of plug-in hybrid electric vehicles(PHEVs) will leads to evident impact on reliable operation of composite power system.The model,indices and algorithm of reliability assessment on composite power system under large-scale grid-integration of PHEVs are systemically researched.Firstly,a simulation model of PHEV charging demand,including the model of the driving and battery characteristics of PHEVs,the model of the travelling habits of users,and the simulation approach for the PHEV charging power demand,is established;secondly,the indices of PHEV penetration rate to power system and the sensitivity index of grid-integration scale of PHEVs to power system reliability that can characterize the impact of grid-integration of PHEVs on power system are put forward;finally,a quick and effective reliability assessment algorithm of composite power system under large-scale grid-integration of PHEVs,in which the extended state-space partitioning method(ESSP) is utilized to assess the reliability level of composite power system after the grid-integration of PHEVs,is proposed.By means of IEEE reliability test system(RTS),the impacts of such factors as grid-integration scale of PHEVs and charging strategy on load curve and reliability level of composite power system are analyzed,and the effectiveness of the proposed indices and algorithm is verified.