Influence of 380 kV AC systems on the maintenance conditions of the HVDC system in a hybrid AC/DC overhead line

Abstract

The growth of the energy production from renewable sources causes the necessity of the transportation of significant power volumes over long distances. Parallel operation of a bipolar high-voltage direct-current (HVDC) power transmission system with the 380-kV alternating-current (AC) power transmission systems on the same line route can be seen as one of the solutions for the increasing of the power transmission capability. One of possible realizations of this solution is the use of so-called hybrid AC/DC overhead transmission lines containing EHV AC and HVDC power circuits on the same pylons. Consequences of this are various AC/DC interaction phenomena. The paper deals with the AC impact on the DC power circuits switched off for maintenance purposes.