Research On Planning Method And Operating State Evaluation For Electric Vehicle Charging And Battery Swapping Stations

Shortage of fossil energy and environmental pollution have promoted the development of the electric vehicle industry, with the progress of electric vehicle battery technology, electric vehicles gradually achieved commercial operation. Electric vehicles are the most promising of a class of new energy vehicles, electric vehicles are the main strategic orientation of new energy vehicle development. Electric vehicle charging and battery swapping stations are important part of supporting facilities, the rapid development is under the support of government policy and active participation of enterprises. Construction and operation of large-scale electric vehicle charging and battery swapping stations is an important guarantee for the development of consumer market. Therefore, it is necessary to expand the study of planning and operational techniques of electric vehicle charging and battery swapping stati ons.The charging load of electric vehicle charging and battery swapping stations has some impact on the power grid. The charging load of electric vehicle charging and battery swapping stations has some characteristics like a fixed charging location, centralized charging time and a large charging load. Firstly, the influence of charging load on power qulity and ecomomic operation of power gird has been analyzed based on the calculation of charging load of electric vehicle charging and battery swapping stations. By comparing the two scenarios of including charging load and without charging load in power flow calculation at different periods, the results of voltage deviation and network loss rate indicate that the operation of electric vehicle charging and battery swapping stations has some adverse effects on the power grid.Secondly, the cost-benefit and life cycle cost calculation methods of the charging and battery swapping stations are detailed analyzed based on the analysis of the influence of charging load on power grid. Then, a new method to estimate the capacity of charging and battery swapping stations is proposed based on the information of traffic network. In the optimal planning model, getting maximum net present value(NPV) for operators is the optimal aim. The constrants include information of traffic network, power quality and economy, customer charging demand. Furthermore, the optimal planning model of charging and battery swapping stations considering LCC has been proposed. Quantum genetic algorithm is used to solve the model. Simulation examples show that the optimal planning model and its solution method are effective.Finally, from the perspective of improving charging and battery swapping stations' operation management level, an operating state evaluation method considering customer satisfaction is proposed. Firstly, taking the linguistic assessment information of the evaluation index by customers and operation state of charging and battery swapping stations equipment as evidence, the evidence is synthesized by DS/G2 Method. Then, the evaluation results of every charging and battery sw apping station are obtained. Secondly, the concept of evidence conflict is introduced and the weight optimization is used to synthesize the evaluation results by d ifferent customers. Finally, the overall evaluation results of charging and battery swapping stations are obtained and the pros and cons are compared in the end. Through the operation state evaluation of the charging and battery swapping stations, it makes sense to improve the service of the charging and battery swapping stations. The feasibility of this method is verified by the example in the paper.