Penetration Level of Photovoltaic in Distribution Network Considering Voltage Constraint

Abstract

A large number of distributed PV connected to the distribution network may cause the voltage deviation of the grid to exceed the limit. Firstly, the calculation model of voltage loss caused by load under different distribution rules and the calculation model of voltage rise caused by photovoltaic are established. On the premise that the voltage deviation of the bus can reach the upper limit of the standard, the maximum allowable PV capacity of the line without overvoltage is derived. For a typical 10 kV line, the maximum PV permeability under the same distribution rule of PV and load and the voltage margin at the head of feeder without overvoltage are given. The results show that the overhead line can accommodate more PV capacity than the cable line, the voltage regulation of PV power can prevent overvoltage, and the bus voltage reduction can allow access to more PV capacity.