TenneT installs first TCSC system in Germany


Series compensation is an innovative technology that significantly increases voltage stability in transmission systems. The Dutch-German transmission system operator (TSO) TenneT is constructing Germany’s first series compensation system in the Stadorf substation in the Lüneburger Heath. From 2023, this will prevent grid bottlenecks in the German state of Lower Saxony. On 15 July 2020, the future heart of the upgraded substation reached Stadorf after an intricate transport by ship, rail and road and was placed on its foundation: a direct-coupling transformer with a transport weight of 528 tonnes.

The TSCNET shareholder supplies large areas of the eastern part of Lower Saxony with electricity via the Stadorf substation. Due to the energy transition and the corresponding transmission of wind power from the north of Germany to the consumption centres in the south, the substation will assume a supra-regional and important function in the future. For this purpose, Stadorf is being comprehensively modernised and extended by a so-called Thyristor Controlled Series Capacitor (TCSC) facility, the first of its kind in Germany.

TCSC allows a fast-dynamic modulation of the inserted reactance and in this case specifically to relieve persistently overloaded lines and redirect load flows. The new direct coupling transformer with a transmission capacity of 300MVA connects the 380kV lines of TenneT with the 110kV lines of the regional distribution system operator (DSO). It provides load flow in both directions, so that locally generated surplus green electricity can be transferred if required. As a result of the substation upgrade with TCSC equipment, the disconnection of wind turbines, regulatory intervention in the grid, and the associated costs will be reduced – and overall system security increased. TenneT anticipates annual savings in the double-digit million euro range.

TenneT is implementing a TCSC facility in the Stadorf substation, the first of its kind in Germany (picture: TenneT)

> See TenneT press release, in German (html)

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TenneT appointed as offshore grid operator


As wind energy continues to grow strongly, the Dutch Senate has confirmed TSC member TenneT, the Dutch-German transmission system operator (TSO), in its role as the developer and operator of the Dutch offshore grid.

In the next few years, TenneT will use a standardised design to build five platforms with a total capacity of 3,500MW to connect offshore wind farms (OWFs) to the onshore grid. The TSO is the world’s first company to connect OWFs at a voltage level of 66kV instead of 33kV to curb both costs and energy losses during transport.

> See TenneT press release (html)

> Watch TenneT animation offshore grid concept (Youtube video)

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50Hertz launches Ostwind 1


Yesterday, TSC member 50Hertz, one of the four German transmission system operators (TSOs), started the construction of the new Ostwind 1 offshore connection. The billion-euro project with a 93-kilometre cable route connecting the offshore wind farm in the Westlich Adlergrund Cluster (CWA) is 50Hertz’s largest investment so far.

> See 50Hertz press release (html)

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G7 ministers visit converter platform


This Monday and Tuesday, the energy ministers and their representatives of Canada, France, Germany, Italy, Japan, the United Kingdom, and the United States met in Hamburg, Germany, to discuss possibilities to ensure long-term sustainable energy security. One of the items on the agenda was the visit of HelWin alpha converter platform in the North Sea, operated by the Dutch-German transmission system operator (TSO) TenneT.

See TenneT press release (html, in German)

See BMWi press release (html)

Image using a picture by BMWi / Maurice Weiss


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World’s largest offshore grid connection


The Dutch-German transmission system operator (TSO) TenneT took SylWin1 into operation. SylWin1 is the world’s most powerful grid connection with a capacity of 864MW. The now-operational link around 70km west of the island of Sylt in the German North Sea connects three offshore wind facilities (“Butendiek”, “DanTysk” and “Sandbank”) with a generation capacity of 288MW each.

> See Siemens feature page (html)

Graphic using a press picture of Siemens AG


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Windy weather brings trouble


Germany produces more and more wind power with more than 21,600 wind turbines. In 2014, the country doubled its offshore wind energy and installed on- and offshore wind turbines with a total output of 4.8 GW. A massive weather front on Monday and today leads to daytime peaks of up to 25 or 30 GW of wind power being fed into the grid and takes a heavy toll on the extra-high voltage grids. The stormy weather boosts power output, and means a lot of work for the operators both at the control centres of transmission system operators (TSOs) and TSCNET Services to avoid congestions. Besides, such large influxes of renewable power make the case for expanding the power network.

Graphics used: www.siemens.com/presse

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