The Argentina -Brasil interconnection first phase of 1000 MW, reported elsewhere, has recently been increased to 2000 MW total power delivery. The second phase is very similar to the first, also employing a back-to-back HVDC converter at Garabi, in Brasil, close to the border with Argentina. A back-to-back HVDC converter can be used when two asynchronous AC systems need to be interconnected for bulk power transmission or for AC system stabilization reasons. In an HVDC back-to-back station there are no overhead lines or cables separating the rectifier and the inverter, hence the DC current can be kept high and the DC voltage low. The low DC voltage means that the air clearance requirement is low, which is in favor of a compact design of the valve housings. This enabled the modular back-to-back HVDC concept to be developed. The back-to-back HVDC converter stations utilized at Garabi are of the modular type with Capacitor Commutated Converters (CCC). The CCC is used to ensure satisfactory performance at low short circuit levels and to reduce the impact of reactive power variations.
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