A three-stage robust voltage control（TSRVC） method with soft open point（SOP） is proposed to solve the problem of voltage violations and fluctuations in the active distribution network（ADN） with high penetration photovoltaic（PV）. At the first stage

the uncertainties of PV output and load are considered on a long time scale. The tap position of OLTC and the set number of CBs are optimized robustly. At the second stage

the active power of each SOP is optimized on a short time scale based on the short-term prediction of PV and load

and the voltage-var control curves are optimized. At the third stage

the local reactive power output of each SOP is dynamically adjusted according to the real-time measured voltage and the voltage-var control curve on the minute scale. Finally

the proposed method is simulated on the improved IEEE 33 node system. The results show that the proposed TSRVC method can be adopted to fully deal with the uncertainty of PV output and load

effectively control the node voltage in an ideal range

and significantly reduce the power loss of the system

realizing the voltage control of ADN with high penetration PV.