According to the instant distribution of reactive power current（ or power） on busbar load of power grid

the linear density distribution of daily average reactive current（ or power） can be obtained. In this paper

on the basis of this

the optimal energy-saving distribution model of reactive power compensation shunt capacitor is obtained

optimal energy capacity distribution at specified compensation position of shunt capacitor

the optimal energy saving position distribution at specified compensation capacity as well as combined distribution of optimal energy-saving and position are discussed. Finally

applicability of the optimal energy-saving distribution model is verified by specific calculation example.