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High penetration of energy resources and energy storage in smart grids has increased capability of reactive power production. The accurate performance of inverters which connect resources to grids can quickly provide the necessary reactive power consumption or injection for voltage correction. Using the communication infrastructure and management created in smart grids, these end-user reactive-power-capable devices can be coordinated for voltage support. Energy management system (EMS) is responsible for network management in smart grids. The assistants, as Distribution Management System (DMS), can be used in very widespread grid to make some of the decisions to control different parts of networks. In this paper, a framework for voltage control by EMS and DMS by introducing a new coefficient is presented. This coefficient is calculated in real time for selection a group of buses that is used for reactive power compensation and voltage correction. Finally discussed how resources selected by DMS.