Distribution Network Line Loss Calculation Method Considering Distributed Photovoltaic Access

Abstract

With access to a high proportion of distributed photovoltaics, the power quality and line loss of distribution networks have become the focus of power grid enterprises. Traditional line loss management does not consider the impact of distributed photovoltaic access, which leads to incomplete line loss calculation methods and management means of distribution network. Therefore, this paper establishes a simulation analysis model of high proportion distributed generation connected to the distribution network and puts forward the overall loss method of the distribution network through theoretical analysis. On this basis, the IEEE 34-node system is used to calculate the impact of different capacities and locations of distributed access on the voltage distribution and line loss of the entire distribution network. The example shows that there is a corresponding relationship between the access capacity of DG and the lowest network loss. When the access capacity of distributed generation is too large, the system’s network loss will increase. Therefore, it is necessary to reasonably select the access capacity of distributed generation. The method proposed in this paper is accurate, and can also take the actual limitations of existing photovoltaic access and developable photovoltaic capacity into account, so it has strong engineering practicability.