The utility model discloses a communication control unit, the feedback control route of its structure for forming between distribution network and dc -to -ac converter to electric parameter according to joining in marriage power grid operation provides the feedback signal of telecommunication to the dc -to -ac converter, communication control unit includes collection system, controller and is used for adjusting inverter output's regulator, wherein: collection system is connected with the distribution network electricity, gathers the electric parameter of joining in marriage power grid operation, the inlet side and the collection system of controller form the electricity and are connected, the regulator forms electric the connection with the outlet side of controller. The inverter output's among the output, especially distributed generator of dc -to -ac converter electric current can effectively be adjusted to this equipment to make the voltage can the stably fluctuation in order to reduce network voltage in the effective range of rated voltage deviation, and then improved electric energy quality, can also increase distributed generator's output, reduce electric energy power 's in the distribution network loss, also can in time close the dc -to -ac converter in order to guarantee electric wire netting safety when the distribution network breaks down.