A recently proposed concept of simultaneous ac–dc power transmission enables the long extra high-voltage ac lines to be loaded close to their thermal limits. The conductors are allowed to carry a certain amount of dc current superimposed on usual ac. This paper presents the feasibility of small power tapping from composite ac–dc power transmission lines which would pass over relatively small communities/rural areas having no access to a major power transmission network.
The proposed scheme is digitally simulated with the help of a PSCAD/EMTDC software package. Simulation results clearly indicate that the tapping of a small amount of ac power from the composite ac–dc transmission line has a negligible impact on the normal functioning of the composite ac–dc power transmission system. This paper presents the power up gradation of existing EHV ac line corridor by converting it into composite ac-dc power transmission line. No alterations of conductors, insulator strings or towers of the original line are needed.
Project on Possibility of Power Tapping From Composite AC-DC Power Transmission Lines project