| Developing electric vehicles is one of the important ways to mitigate environmentalpollution and to shift from the reliance on petroleum resources. Now Electric vehicles (EVs)are becoming popular as to the increasing government support and the continuousimprovements of charging technology and the equipment. Power system faces newchallenges because of the growing EV charging scale. It is particularly necessary toresearch the grid’s adaptability of charging load and assess its economic impact, whichhelps developing not only EV industry but also the grid itself. This paper focus oneconomic assessment on the grid integrating EV charging, the main work and the resultsachieved are summarized as follows:Firstly, this paper surveyed the main content and direction of the EV charging research,focusing on the influence that charging load brings to power quality, distribution networkplanning and economic operation, which lays a solid theoretical foundation to establish theassessment index system.Based on the analysis of influence factors of the EV charging load modeling, itsummarized the main method of charging load modeling at present and established aload-determine model based on the travel regularities and a charging (or changing) station’sprobability load model. In addition, an orderly charging control strategy is proposed basedon controlling charging load demand between different regions, which determines thecharge time and place and aims to a smooth load curve and provides comparativeassessment to EV charging’s impact on the distribution network.The EV charging load is spatially and temporally uncertainty. This paper appliespower system probabilistic production simulation method, considering the system supplyreliability index, to calculate the amount of coal burning savings under local and globalorderly charging. The calculation example shows that by controlling the EV charging cannot only save energy, but also improve system’s reliability and capacity utilization. Amathematical method is proposed to evaluate EV coordinated charging benefits, which haspositive significance to similar issues.This paper established assessment index system for the EV charging economic impacton distribution network, and specific steps of economical fuzzy comprehensive assessmenton distribution network including EV charging load is given. In order to assess the degree of impact on different types of load area, different types of basic load is provided; differentEV proportions involved in the coordination charging formed comparison to assesscoordination charging’s effect on improving charging load’s influence and the distributionnetwork’s ability to accept the charging load. Assessment process achieved a mathematicalquantification to a qualitative problem, and it can be programmed and transplanted easily. |
