Induced voltages on HVDC systems by HVAC systems at the same support structure due to capacitive and inductive coupling

HVDC and HVAC systems at the same support structure are an important issue to increase the transmission capacity of a corridor. But due to the near vicinity of the different systems influences can occur. This paper describes the induced voltages on HVDC systems. These will be determined with a decoupled method for inductive and capacitive coupling of different tower structures to get a first impression of the magnitude of the induced voltages. Also the influence of transposition for double circuit lines was taken into account. To determine the influence of both couplings a distributed line model was applied and a transmission corridor consisting of different tower structures was investigated considering varying load flow directions for the AC Systems.