This paper discusses the performcame of dyn,unic voltzzge control devices at the inverters of very we'& ac systems. The types of compensation considered are: a) Stzztic var compensator (SVC), b) Synchronous compensator (SC), c) A mix of the two and d) Fixed Capacitors. Although the primary purpose of these compensators is to control v o l~g e at the ac bus, their dynamic perform'mce during system disturb,ulces is a very important factor. The investigation includes the behavior of the v,Uous voltzzge control options under ac 'and dc disturbances. The paper shows that the SVC has the fastest response for load rejection type of overvoltages, but can cause serious problems with recovery during undervolmges caused by single phase faults.. . The CIGRE benchmark model for HVdc control studies has been modified and used in this study. In p'uticular the effect of local load has been included.

This paper investigates the dynamic performance of the advanced static var compensator or STATCON at a high voltage direct current (HVDC) converter terminal where the ac system has a very low short circuit ratio (SCR). The STATCON is based on a nine-level GTO thyristor inverter. The studies include operating characteristics of the STATCON under various ac and dc disturbances. The simulation results are compared with other types of reactive power compensation options available for such applications. It is shown that the STATCON has clear advantages over the other compensators, in areas such as; fault response time, voltage support ability, and dc recovery, while operating with very weak at systems.

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