The world is seeing a surge in the application of renewable energy sources (RES) such as hydro, wind, solar, and stored energy solutions. This RES penetration impacts overall grid performance due to its fluctuating nature and distance from load sources. New rights-of-way (ROWs) are highly opposed by landowners, expensive to build, and in some instances, not fully utilized due to system load flow dynamics. Transmission from RES to load centers to meet load growth is difficult within the existing AC transmission ROWs. To overcome these challenges, utilities and private RES developers are examining the option of converting AC transmission lines to DC, which would allow for an increase in both transmission capacity and controllability to meet these challenges. This report aims to provide a practical application guide for converting an AC transmission line to DC. The opportunity, evaluation, and design requirements of the DC conversion option are discussed in this report.
AC to DC conversion, Rights-of-way, Transmission capacity