The Effect of a High Proportion of Distributed Photovoltaic Access on Distribution Network Voltage Power Flow

The voltage and current of the distribution network will be impacted to some extent by a large percentage of distributed solar power supply access. It can cause problems such as voltage overruns and current reversals. This research studies the power flow change law of the distribution network after PV access theoretically and through simulation in order to tackle this problem. The impact of PV access on distribution network voltage and network loss under different access locations, capacities, power factors and other parameters is investigated. Furthermore, the effect of distributed PV access on distribution network trend is examined in less than a day, taking into account the PV daily output and load characteristics in the Qinghai region. The findings indicate that the lifting impact on the distribution network's voltage is more pronounced the higher the distributed solar power supply's access capacity and the later the access location. At the same time, PV power access also reduces the line power flow and thus reduces the network loss. When the PV access position is at the end of the line, there is a noticeable decrease in line losses. In addition, the PV output is insufficient when the load peaks during the daytime. This phenomenon causes an increase in network losses and a decrease in voltage. This study can lay the foundation for reasonable access of distributed PV to effectively support line voltage and reduce network losses. The influence of distributed PV access on the distribution network current law is made clear in this paper, which can serve as a theoretical guide for research on distributed PV power access to the grid.