Analysis of Influence of Distributed Photovoltaic Access to Distribution Network on Voltage

Distributed photovoltaic power sources are developing rapidly with their economic and environmental advantages, but they will also have an impact on the power distribution network. Connecting distributed photovoltaic power generation to the grid will cause problems such as voltage deviation exceeding the standard limit the development of photovoltaic power generation, changing the distribution of power flows in the power distribution network during normal operation. Firstly, the modeling and control system of distributed photovoltaic system is introduced; then, under the condition of ignoring reactive power and line reactance, a simplified analysis model of voltage drop is proposed according to the topology of power distribution network, and the theoretical analysis is carried out. The different positions of the access point of distributed photovoltaics in the power grid system and the different capacities of photovoltaic access will have any impact on the voltage of the normal operation of the power distribution network. Finally, the simulation verification is carried out on PSCAD, and the conclusions and theories are drawn. The analysis is consistent: the larger the photovoltaic access capacity, the farther the access position is from the head end, the greater the increase in line voltage, and the greater the voltage deviation.