Voltage security analysis with high PVs penetration considering the interaction of transmission and distribution grids: Case studies

With the increasing of the capacity of PVs all over the world, the impact of power gird operation due to the output fluctuations of PVs has become increasingly significant. As a kind of PV, distributed PVs are closer to user side, which are difficult to observation and control at the transmission network side, and can bring unknown challenges to the operation of power grid. So the impact of distributed PVs on the voltage security of the transmission and distribution associated systems should be taken seriously. In this paper, a transmission and distribution associated system contains distributed PVs was built based on DIgSILENT/powerfactory. Then the article analysis the impact of distributed PVs to the voltage security of transmission and distribution two levels power grid containing high penetration distributed PVs in two aspects, the output fluctuations of distributed PVs and the faults in the transmission network lines using simulation. At last, the article makes a conclusion of the impact of grid connect distributed PVs to the power grid.