Abstract: All-day Detailed Continuous Simulation and Impact Analysis of Voltage Control Strategy for High Penetration Distributed PV Based on Voltage Control System of Real Distribution Network At present, with the large-scale grid connection of high penetration distributed PV, one of the outstanding problems in the operation of distribution networks is the voltage violation. When the PV output power is large or the load is low, the PV grid-connected point or point of common coupling(PCC) voltage will exceed the secure operation requirements which also have an impact on the existing reactive automatic voltage control system (AVC). With consideration of the available reactive power regulation capability of PV inverters, PV power generation systems also need to participate in the reactive voltage regulation of the distribution network. Therefore, based on the actual grid data, this paper conducts a complete detailed modeling of a 110kV substation-level regional power grid, including substations, subordinate feeders and branch lines, all end-user loads, and user-side PV power generation systems, in a park with high penetration distributed PV of industrial and commercial users. With consideration of the substation AVC control system operation strategy and the minute-level fluctuation characteristics of solar irradiance, a system-level simulation model with 5 minutes time step was established, and a typical voltage control strategy model for PV inverter was established based on the OpenDSS simulation platform which includes three control strategies such as constant power factor, variable power factor, and reactive voltage control. On this basis, a system-level continuous control simulation was performed every 5 minutes throughout the day. Through comparative analysis, it was found that in the three control strategies, the reactive voltage control strategy is directly controlled by the local voltage of the PV power generation system, which can ensure that the voltage of PV grid-connected point is controlled within a preset target range with little impact on the operation of the existing AVC control system. Meanwhile, the regional power grid line loss is relatively small. Furthermore, in order to resolve the reactive voltage problem at this level of the power grid and avoid reactive power regulation at the higher-level power grid, it is recommended to equip the substation with a certain capacity of continuous dynamic reactive power compensation equipment to dynamically track the reactive power absorbed by the PV power generation system while maintaining the safe and stable operation of distribution networks.