transmission line, giving more strength and credibility to the Energy source converters (HVDC-VSC), with an estimated length of km from. The HVDC Itaipu is a High-voltage direct current overhead line transmission system in Brazil from the Itaipu hydroelectric power plant to the region of São Paulo. A high-voltage, direct current (HVDC) electric power transmission system uses direct current for the bulk.

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Lineea case of a single line failure, transmission with reduced power is possible via the surviving pole and return through the earth. Cahora-Bassa was out of service from to because of the Mozambican Civil War in the region.

Sistemas de transmisión de corriente contínua en alta tensión HVDC – Siemens

The project was beset with technological challenges, most notable of these being the adoption of transmislon rectification devices in a large-scale commercial installation. Mercury-arc valves had been the de facto standard for HVDC up to this time. Cahora Bassa was the first HVDC scheme ordered with thyristor valves, though its operation was delayed. Significant commercial hurdles, culminating in hearings at an International Arbitration Tribunal seated in Lisboninalso had to be overcome.

Following a refurbishment exercise, [2] the scheme was put back into commercial operation in October The tripartite agreement was suspended due to force majeure when the line from Cahora Bassa was unavailable in the s. The system was commissioned in three stages starting in March with four six-pulse bridgesand in full operation of eight bridges on March 15, The power line runs from the Songo converter stationwhich is near the hydroelectric station and normally operates as a rectifier, to the Apollo converter station near Johannesburg, which normally operates as an inverter.


Earth return for unipolar operation is provided by buried graphite electrodes at lknea station. The DC line has smoothing reactors and surge arrester capacitors at each station.

Unusually, the thyristor valves are outdoor mounted. In the original installation they were oil filled for both cooling and electrical insulation.

The only other HVDC scheme in the world equipped in this way from the outset was the first phase — now decommissioned — of the Shin Shinano frequency converter in Japan.

Each valve tank contains two valves, forming a double-valve connecting the two DC terminals to one single-phase, two-winding converter transformer. Each six-pulse bridge contains three such tanks and hence each station contains 24 double-valves. Phases rransmision and 3 used improved thyristors with a rating of 2.

The thyristors also had poor transient overcurrent capability, so another unusual feature of the scheme was the existence of overcurrent diverters between the valves and transformers, although these were later decommissioned at the Apollo station. There are two PLC repeater stations: After the civil war ended inone of the many effects of the decade of strife was the damage to the HVDC transmission transjision.

HVDC Italy–Corsica–Sardinia – Wikipedia

This work was started in and took until late to complete. The principal purpose of this infrastructure is to provide bulk electricity supplies to the Mozal Aluminium Smelter operated by BHP Billiton. The Memorandum of Understanding, signed on 2 Novembermeans that Mozambique will by the end of be in charge of a project located on its soil but on which it had no control for lonea past 30 years due to contractual obligations with Portugal.


The project transmieion a capacity to produce 2, hdvc of electricity and is one of the main suppliers of power to the Southern African Power Pool. In a contract was awarded to ABB to replace the thyristor valves at the Apollo station. At the same time, the AC filters were replaced.

Licitación Pública Internacional LT/SENER-01-2018

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The southern line crossing through the Kruger National Park. MozambiqueSouth Africa.

HVDC Italy–Corsica–Sardinia

Cahora Bassa DamMozambique. JohannesburgSouth Africa. Map all coordinates using: