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Abstract: To solve the voltage control problem caused by high penetration level of distributed photovoltaic (DPV) in distribution network (DN), based on the voltage control characteristics of the reactive power compensated PV and the voltage-controlled PV, a multi-time scale coordinated control method based on point of common coupling (PCC) reactive power/voltage optimization of PV is proposed. On the long-time scale, an optimal reactive power dispatch (ORPD) model considering the chance constraint of voltage is proposed, which sets minimum operating cost as its target, including the adjusting cost of discrete devices. On the short-time scale, an adaptively slack optimal control strategy for PCC reactive power and voltage (Q/V-ASOC) is proposed, which can adaptively adjust the PCC reactive power and voltage according to the real-time changes of PV and load output. By comparing the control effect of different coordinated control methods for multiple PVs, an advise on the decision of reactive power and voltage coordinated control scheme for DN with high penetration level of PV can be provided.

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