One example of that is the DolWin2 project Figure 1. ABB designed, supplied, installed, and commissioned the compact offshore and onshore converter stations, as well as the subsea and underground cable systems. Siemens has also completed projects of this nature.
One thing that often puts the kibosh on an HVDC project is cost. Converter stations are expensive. Three main factors need to be considered. Culbertson recalled a study he had been involved with early in his career. It was completed for a gas company that was trying to determine if it was more cost-effective to build a natural gas pipeline or an HVDC transmission line from Turkmenistan, where gas was plentiful, to Pakistan, where power was needed, by way of Afghanistan.
Both options were very expensive. Ultimately, the project never got off the ground due in large part to political unrest in the region. But there are plenty of projects that are moving forward. Siemens is supplying two converter stations with two 1,MW parallel converters, while Sumitomo Electric is responsible for the cross-linked polyethylene HVDC cable system in the DC circuit.
Grid connection is scheduled in the first half of Siemens is also involved in a couple of UK projects. The Nemo Link will interconnect the British and Belgian national grids via subsea cable. Siemens is responsible for the turnkey installation of a converter station on an 8-hectare site in southeast England, formerly occupied by the Richborough Power Station, and a similar converter station in the Herdersbrug industry zone in Bruges, Belgium.
The U. The mile line transmits electricity between the Pacific Northwest and the Los Angeles area, moving surplus electricity from one region to the other as seasonal demands shift.
Since its original construction, modernizations have more than doubled its DC capacity to 3, MW. A proposed HVDC line with a capacity of 4, MW would transmit wind-generated electricity from the Oklahoma panhandle miles east to the western tip of Tennessee.
Construction could begin later this year, according to one of the developers, but that hinges on receiving the necessary reviews and approvals from various governmental entities involved. Beta Engineering provided the engineering, procurement and construction for an HVDC converter station in Colorado, and has completed a wide range of high voltage projects across the country. Browse our portfolio and contact Beta today to discuss your next substation or other high-voltage project.
About Services Projects Careers Contact. Voltage Converters. Soft Starters. Lot of literature can be found in French since France and Quebec are the countries where the HVDC transmission is very developed and already mature technology. Why it is used? Few more European countries than France are on the way to use this new technology more and more even the distances are not the main factor for it. Second advantage of the HVDC transmission is that there is not a problem with the synchronization of the different parts of the system.
The DC is flowing with the overhead lines and at the user end again DC is converted into AC by using inverters, which are placed in converter substation. The power remains the same at the sending and receiving ends of the line. DC is transmitted over long distances because it decreases the losses and improves the efficiency.
Similarly, if substation has more than two converter stations and interconnecting DC terminal lines, it is called multiterminal DC substation. DC lines are cheaper than the AC lines, but the cost of DC terminal equipment is very high as compared to AC terminal cables shown in the graph below.
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