Simultaneous Tapping of AC and DC Power and their Independent Control from Composite AC–DC Power Transmission Lines

Abstract

Generating electrical energy stations (Hydro, thermal, nuclear) are generally located distant away from the load centers. EHV and HVDC lines transmit these generated powers from far-off places to the point of utilization. An alternate way of wheeling electrical power using composite AC-DC has already been reported, where conductors can transfer a definite amount of DC current superimposed on the normal AC. Small ac power tapping for rural electrification from composite AC-DC transmission lines has been reported earlier. This paper focuses on the possibility of several power tap-offs, AC and DC, from composite ac-dc power transmission lines with an insignificant impact on the main line’s stability and power transfer. The proposed model is simulated in PSCAD/EMTDC to justify the results.