Hello everyone
is Back to back VSC HVDC is consider as a FACTS device and if so, who got the best performance between the HVDC back to back and the UPFC
Thank's in advance
Dear DJILANI KOBIBI Youcef Islam ,
I will assume only you mean the back to back VSC which take ac and convert it to dc then the last stage is ac.
It is a generic topology that can be utilised in many applications such as FACTS and HVDC transmission.
Moreover, line commutated converters (LCC) which based on CSCs are widely used for HVDC transmission.
VSC -HVDC is basically converting AC to DC and then DC to the AC. FACTS devices are basically for the increase in transfer capability, improvement in transient stability voltage stability etc. In VSC-HVDC both controllers are series-series connected. None of the controllers inject any voltage either in series or parallel. FACTs devices are basically injecting the voltage in phase with with terminal voltage, in loss or perpendicular with the current. Therefore in my view VSC-HVDC shall not be included in the FACTS category.
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