This paper studies the grid access capacity for distributed photovoltaic power

considering the existing distribution network and operation conditions. Firstly

the distribution network and load are analyzed

the initial value of distributed photovoltaic source grid connection location and capacity is set with the historical data

along with the initial correlation matrix constructed. Then

the correlation of distributed photovoltaic power and load is analyzed

a photovoltaic power local consumptive capability index is defined

thus the modified initial correlation matrix can be improved. Based on these analysis

this paper proposes an objective function as the minimum electricity export to the main network

the node voltage and the export power to the grid are the main constraints. The former back flow algorithm and simulated annealing algorithm are used to solve the model. The distribution network of Maxin 10 kV power station is taken as an example. When the correlation of distributed photovoltaic power and load is considered

the simulation results show that grid access capacity for distributed photovoltaic power can be increased effectively. This work is supported by State Key Program of National Natural Science Foundation of China(No. 51137003).