A voltage coordinated control method for distribution networks considering load characteristics and photovoltaic(PV)reactive power cost is proposed in the market environment where huge amounts of PV power of the third party is connected to the distribution network. The method includes the day-ahead optimization and the day-here optimization. For the day-ahead optimization

the objective function is optimizing the loss and cost of the on-load tap changer(OLTC)and the shunt capacitor

moreover

optimizing the OLTC tap and shunt capacitors action plan in the next 24 h. For the day-here optimization

a cost model of PV reactive output is developed. The objective is optimizing the optimal loss and the PV reactive power cost. The influence of the prediction error will be eliminated by adjusting the PV reactive power output. And the correction of day-ahead optimization is added. Furthermore

in order to achieve a better effect in the areas with more industrial and commercial loads

the load static voltage characteristics are taken into consideration in the reactive output optimization. In addition

a power flow calculation model in consideration of load characteristics is developed to improve the optimization performance. The results of actual simulation show that the coordinated control method can better eliminate the influence of prediction error

while stabilizing the voltage fluctuation and reducing the cost of control.