VSC HVDC transmission corridor: An option for PV power injection and AC network stability support

The pressure of increasing power demand and supply inequality is forcing utilities to interconnect AC systems to meet demands. High Voltage Direct Current (HVDC) schemes are becoming a more attractive solution as they have been used extensively in interconnected power systems worldwide. This paper investigates the role of voltage source converter (VSC) based HVDC transmission corridor for PV power injection and for AC network stability support. Overview of Namibia Caprivi-link interconnector a case study, potential of very large scale PV in Namibia and prospects of PV power injection on the DC-link is presented. The system is modelled simulated in Matlab/Simulink. Critical contingencies such as sudden island conditions, three-phase to ground fault are simulated with and without PV penetration. Results show the stability support on the AC side networks by PV power injection on the dc-link.