I. Introduction
The distributed generator is a vital energy choice in the 21st century. It plays an essential role in promoting the process of carbon neutrality. Photovoltaic (PV) has the advantages of clean environmental protection, safety, and reliability. It often exists in the form of distributed PV in the distribution network (DN). However, with the continuous increase of PV permeability, the DN has various problems, such as over-voltage, line overload, and power quality exception[1]. Therefore, to ensure the coordinated development of DN and PV, it is necessary to evaluate the PV capacity that each bus of the DN can be connected to guide the planning and construction of PV and DN[2].