Abstract: Due to the regularity of photovoltaic output, there is a phenomenon of high and low voltage cross‍ing and interweaving in the distribution substation area after photovoltaic integration, which seriously affects the safe and reliable operation of the distribution network. To address the issue of high and low voltage crossing caused by photovoltaic integration, the paper analyzes the mechanism of voltage crossing in the distribution network substation area, and studies the dual closed-loop control and active and reactive power output characteristics of photovoltaic inverters. On this basis, a voltage regulation strategy for the distribution transformer substation area based on photovoltaic inverter power control is proposed to achieve a reasonable range of terminal distribution transformer substation area voltage under different operating conditions. The effectiveness of the control strategy is verified through simulation.

Key words: distributed photostatic, photovoltaic inverters, distribution substations, high and low voltage overruns, voltage regulation strategies