In order to solve the problem of active power optimization being usually singleobject oriented and the coordination between distributed generators (DGs) and traditional voltage control method being poor

a comprehensive voltage control optimization using the twostage planning algorithm is proposed. Firstly

the differential evolution algorithm is used to obtain the feasible state when the status of underload tap changer (ULTC) and shunt capacitors is determined by the second stage. Then the DG optimal output from the first stage is fed back to the second stage

and the optimal values of the objective function are calculated by the dynamic programming algorithm while the voltage control plan for dayahead is obtained. Finally

the proposed method is implemented in MATLAB

its effectiveness in the coordination of DG output verified by simulation cases. This work is supported by National Natural Science Foundation of China (No. 51207051).