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The INELFE/Siemens transmission links 1 and 2 between
Baixas, west of Perpignan in France, and Santa Llogaia,
south-west of Figueras in Spain, is an important component
of the trans-European electricity network. The
installation can transmit rated power of 1,000 MW per
link with minimal transmission losses. The converter stations
use HVDC PLUS voltage-sourced converters in a modular
multilevel converter arrangement (VSC-MMC) with a
transmission voltage of ±320 kV DC. The power will be
transmitted over a distance of about 65 kilometers with
underground cables in trenches and in a tunnel through
the Pyrenees for about eight kilometers. The project illustrates
the unique capability of VSC technology to meet special technical demands. The independent exchange of reactive power for each network, as well as the black-start capability, which enables the HVDC system to restart a collapsed network, are particularly worth mentioning.

Press release (PDF): Siemens erects power converter stations for HVDC link between France and Spain as part of the Trans-European Network

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Trans Bay Cable, LLC, awarded Siemens a contract to construct a submarine High Voltage Direct Current (HVDC) transmission link between San Francisco’s city center and a Pacific Gas & Electric substation near Pittsburg, California. The Trans Bay Cable Project will transmit 400 MW active power and ± 170 Mvar reactive power (statcom function) and is the first order for the innovative HVDC PLUS technology by Siemens. This project is a milestone of the HVDC PLUS technology in terms of providing densely populated areas with new transmission capacity. Siemens HVDC PLUS System is based on a multilevel Voltage Sourced Converter Technology. Its innovative design offers technical and economical advantages. HVDC PLUS enhances the performance of the transmission grid, improves reliability, and reduces maintenance costs. HVDC PLUS is the preferred solution in space-constrained environments, as you will find them in San Francisco. The heart of the HVDC PLUS converter stations is the multilevel converter where the conversion from AC to DC transmission, and vice versa, takes place. In comparison with line-commutated converters based on thyristor technology, the HVDC PLUS system operates with powered semiconductors with turn-on and turn-off capability (IGBT). After commissioning in 2010, the Trans Bay Cable Project is anticipated to meet the California Independent System Operator’s (ISO) planning and reliability standards.

Press release (PDF): Siemens to deliver new HVDC technolgy for low-loss power supply via submarine cable to San Francisco