Planning EV charging stations reasonably is significant to the development of whole EV industry. Taking constraints of charging capacity and investment limitation into account, the optimization model of EV charging station planning with the objective function of minimum annual cost is established. Constraint of service radius is replaced by constraint of battery capacity which takes the factor of EV itself in order to eliminate the possible planning failure. The model is solved by the chaos and harmony search algorithm and the optimal result of the charging stations planning is obtained. Case analysis shows that the method proposed in this paper has a certain practical and scientific, and can provide some reference for the planning of EV charging stations.

ERP plays an important role in company production and management. With the wide application of ERP, the evaluation of its application performance is particularly necessary in order to constantly improve its implementation effect. ERP engineering project performance evaluation is a holistic concept, which involves multiple aspects and needs to combine the qualitative and quantitative analysis. To assess the ERP implementation performance of Power Company, this paper firstly established a comprehensive evaluation index system. Secondly, the evaluation model of ERP implementation performance was proposed based on gray triangle whiten function. Then, this paper described the ERP project implementation performance evaluation process. Finally, through the empirical analysis, the practicability and effectiveness of the proposed method was verified.