Analysis of the Influence Mechanism of Distributed Photovoltaic on the Voltage Distribution of Distribution Network

With the rapid development of distributed photovoltaic systems, the number of distributed photovoltaic systems connected to the distribution network is increasing, which leads to the gradual emergence of power quality problems, especially the problems of voltage fluctuation, harmonic pollution and power factor. In this paper, the working principle of distributed photovoltaic and its interaction with the power grid are first explained, and then the influence of single and multiple photovoltaic system access on the voltage distribution network is analyzed through theoretical calculations. In this study, the concept of virtual injection of active power at nodes is proposed, and the role of inverter coordination control strategy in voltage regulation is discussed, and it is pointed out that reasonable control of virtual injection of active power can effectively suppress the risk of voltage overrun. Finally, this paper summarizes the influence mechanism of distributed photovoltaic access on power quality, and proposes corresponding monitoring and governance measures.