电动汽车充电机运行状态多指标综合评估

Multi-index comprehensive evaluation of running state for electric vehicle charger

随着电动汽车的大规模应用,充换电设施在运行过程中的插拔接口接触不良、输出指标误差过大或安全性能测试不合格都将影响其使用性能。针对此问题,提出充电机运行状态多指标综合评估方法。在分析现有标准的基础上,提出各项指标模糊理论评分方法,构建了充电机运行状态评估指标体系;基于大量投用的充电机对电网稳定性、电池寿命及其自身安全可靠性三方面的影响,确定各项评估指标重要度,采用层次分析法及熵权修正法确定各项评估指标的权重值,建立综合权重矩阵。实例分析结果表明,采用充电机运行状态多指标综合评估方法得到的结果直观且与实际相符,具有较高的可靠性。

With the large-scale application of the electric vehicles, the bad performance of plug capability, the error of output index and the unqualified of safety performance will affect the performance of chargers during the opera- tional process. In this regard, a muhi-index comprehensive evaluation method of running state for charger is proposed. The grading method of the indexes is illustrated, and the evaluation index system of the running state for charger is constructed based on the analysis of existing standards. The influences of massive employment of chargers on power grid stability, power battery life and its own security and reliability are analyzed, based on which the impor- tance of each evaluation index can be determined. Then the weights of the evaluation indexes are achieved by the combination of AHP （Analytic Hierarchy Process） and the entropy weight correction methods. Consequently, the comprehensive weight matrix of evaluation indexes is formulated. Results of case analysis show that the multi-index comprehensive evaluation approach provides intuitive and reliable results ,which coincide practical engineering.