求翻译：文献[2]研究了不同电动汽车汇聚度和接入水平下充电行为对配电网电压水平的影响。文献[3]表明如果不能对电动汽车充电行为进行协调控制，将会影响配电网的安全经济运行，导致区域配变和线路的过载，大大降低配网运行经济性和安全性。是什么意思？

[2] studied the convergence and access level of different electric vehicle charging behavior under the influence of the distribution network voltage level. [3] that if not the electric car charging behavior of coordination and control, will affect the safe and economic operation of distribution netw

Literature [ 2] studied the different electric car pooling, and the access level of the distribution network charging behavior of the voltage level. Literature [ 3] shows that if you do not conduct the electric car charging control coordination, will be affected by power distribution network securit

Literature (2) has studied under the different electric automobile gathering and the turning on level charges the behavior to the distribution network voltage level influence.Literature (3) indicated if cannot carry on the coordination control to the electric automobile charge behavior, will be able

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