DYNAMIC PERFORMANCE OF A STATCON AT AN HVDC INVERTER FEEDING A VERY WEAK AC SYSTEM

This paper investigates the dynamic performance of the advanced static var compensator or STATCON at a high voltage direct current (HVDC) co nverter terminal where the ac system has a very low short circuit rati o (SCR). The STATCON is based on a nine-level GTO thyristor inverter T he studies include operating characteristics of the STATCON under vari ous ac and de disturbances. The simulation results are compared with o ther types of reactive power compensation options available for such a pplications. It is shown that the STATCON has clear advantages over th e other compensators, in areas such as; fault response time, voltage s upport ability, and de recovery, while operating with very weak ac sys tems.