525kV technology for Germany’s “power highways”

04.12.2019

SuedLink, SuedOstLink and A-Nord are large-scale DC connection projects that are essential for Germany’s low-carbon energy future, since these so-called “Stromautobahnen” (power highways) will transport green electricity generated in the north and east of the country to the consumption centres in the south and west. The three power lines will be implemented predominantly via underground cabling and are collaborative efforts of the four German transmission system operators (TSOs). TenneT and TransnetBW cooperate on SuedLink, 50Hertz and TenneT join forces on SuedOstLink and A-Nord is carried out by Amprion. Together with Ultranet, a joint project with TransnetBW, A-Nord forms the Korridor A.

The four TSCNET shareholders intend to install innovative plastic-insulated DC cables with a voltage level of 525kV in these projects. So far, 320kV cables have been used for comparable DC connections in Germany. As a matter of fact, it will be the first use of 525kV underground cables worldwide, which underlines the pilot character of the three high-performance connections. The decision by the TSOs was preceded by an extensive test phase on the technical suitability of the 525kV cables. The pre-qualification tests according to international standards of the Council on Large Electric Systems (CIGRE) were successful and proved that the 525kV cables are reliable and safe.

A higher voltage level of the cables translates into more transmission capacity. This has two possible effects for the planned DC lines, assuming technical feasibility for the entire system: On the one hand, more electricity can be transmitted in a certain corridor with the same number of cables. On the other hand, fewer cables are required to transmit the same power compared to 320kV cable systems. This allows the routing to be designed narrower, which reduces excavation work and environmental impact.

The four German TSOs opt for innovative 525kV solution for power highways with underground cabling (picture: TenneT)

Linkup
> See 50Hertz press release, in German (html)
> See Amprion press release, in German (html)
> See TransnetBW press release, in German (html)

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Variable shunt reactor for SINCRO.GRID

03.12.2019

The two transmission system operators (TSOs) and TSCNET shareholders ELES from Slovenia and HOPS from Croatia are cooperating in SINCRO.GRID. This cross-border smart grid initiative is coordinated by ELES and comprises in addition to the TSOs also two distribution system operators (DSOs) from both countries. The objective of the European Project of Common Interest (PCI) is to optimise the efficiency of the respective national transmission systems by means of advanced technologies and innovative data processing methods.

Since the substantial allocation of EU funding to SINCRO.GRID under the Connecting Europe Facility (CEF) programme in 2017, the project has made significant progress. A vital component of SINCRO.GRID is optimising and installing compensation devices for reactive power control, e.g. variable shunt reactors, which are used in high-voltage transmission systems for voltage stabilisation during load variations. Now the ELES substation in Divača in south-eastern Slovenia has been equipped with such a technically advanced device manufactured by Siemens in Austria. The assembly work is in full swing and is expected to be completed by 12 December. Preparatory work for commissioning will then commence immediately.

Another major component of SINCRO.GRID is a dynamic thermal rating system for power grid operating limits. The aim is to evaluate marginal capacities of transmission system components considering weather influences and thus to improve operational safety and utilisation of overhead lines and transformers. In addition to hard- and software in control centres, atmospheric measuring devices, which are installed directly at the pylons, are also part of the system. Corresponding tests of innovative weather stations are underway. Last week, the substructure for the weather station on the Kleče-Divača overhead line was field tested.

SINCRO.GRID advances technical innovations (picture: ELES)

Linkup
> See ELES press release (html)
> Visit SINCRO.GRID website (html)

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Swift progress for new 50Hertz overhead line

29.11.2019

This May, TSCNET shareholder 50Hertz, one of the four German transmission system operators (TSOs), started the construction of the first section of the 380kV Perleberg-Wolmirstedt overhead line. The new line will connect the Perleberg substation in Brandenburg with the Wolmirstedt substation in Saxony-Anhalt over a distance of 106km and replace the existing 220kV line from the 1950s. This grid extension is intended to ensure that the increasing quantities of regionally generated electricity from renewable sources are also available to consumers in southern and western Germany.

The first construction phase with 87 pylons and a length of 37km stretches between the substations Stendal West and Wolmirstedt. Construction work is progressing rapidly. More than half of the pylons have now been erected and some masts have already been fitted with power cables. Construction should be completed by mid-March next year.

50Hertz has already erected 48 pylons of the Perleberg-Wolmirstedt overhead line (picture of the substation Wolmirstedt: Otto-von-Guericke-Universität Magdeburg)

Linkup
> See 50Hertz press release, in German (html)

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Kick-off for new Weinviertel Line

19.11.2019

The Weinviertel Line (“Weinviertelleitung”) in Lower Austria is in operation for more than 70 years. An elementary component of the grid of TSCNET shareholder APG, the Austrian transmission system operator (TSO), the 220kV line is now in considerable need of rehabilitation. Apart from that, the routing of the existing line does not meet the requirements of the future energy system characterised by decentralised generation of the renewables. The Weinviertel Line reconstruction is therefore essential for the implementation of the Austrian energy and climate strategy “#mission2030”, which sets the national goal of covering 100% of electricity consumption with renewable energies by 2030.

The new 380kV Weinviertel Line will run from Seyring near Vienna to the substation in Neusiedl an der Zaya in the north-eastern Weinviertel. Here in Neusiedl, the ground-breaking ceremony for the new construction has now taken place. To the benefit of the environment and local residents, the new Weinviertel line requires 53 pylons less than the old one. “This is because we can dismantle the first eleven kilometres of the old line without replacement, as we will connect the new line with an existing line and feed it in there,” explained Gerhard Christiner and Thomas Karall, CTO and CFO of APG respectively. The investment costs for the new line amount to 200m euros.

Christiane Teschl-Hofmeister, a member of the Lower Austrian state government who attended the ceremony, commented: “With the new APG Weinviertel Line, Lower Austria will have an efficient and future-oriented grid connection for renewable energies from the region. The APG Weinviertel Line thus makes an important contribution to the Lower Austrian Climate and Energy Roadmap 2030.”

APG has started construction of the new Weinviertel Line (picture: APG; from left to right: Franz Mittermayer from Austrian energy company EVN, Thomas Karall, Christiane Teschl-Hofmeister and Gerhard Christiner)

Linkup
> See APG press release, in German (html)

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First pylon of new East Bavarian Ring erected

16.11.2019

The Ostbayernring (East Bavarian Ring) is an existing power line operated by the Dutch-German transmission system operator (TSO) TenneT, that stretches about 185km from the Upper Franconian town of Redwitz via Mechlenreuth and Etzenricht to Schwandorf in the Upper Palatinate. After the shutdown of Northeast Bavarian nuclear and conventional power plants, the Ostbayernring primarily transports renewable energies. On several days of the year, more energy is generated by wind turbines and photovoltaic plants in the regions along the East Bavarian Ring than is needed locally. Due to the resulting increase in the amount of renewable energy fed into the grid, the East Bavarian Ring regularly reaches its capacity limits.

To ensure the security of supply and the reliability of the grid and to prevent grid failures for the entire region of Upper Franconia and Upper Palatinate, the transmission capacities of the East Bavarian Ring need to be significantly improved. A replacement construction for the East Bavarian Ring was therefore included in the German Federal Requirements Plan and the urgency of the project for the energy market was legally determined. The new line is being constructed along the existing route, extending the current 380/220kV systems to two 380kV systems.

In the course of the construction of the new East Bavarian Ring and the related grid reinforcement, the Redwitz, Mechlenreuth, Etzenricht and Schwandorf substations of the TSCNET shareholder are also being upgraded. Now the first pylon of the new Ostbayerring has been erected on the site of the Etzenricht substation. TenneT has captured the construction on film in order to give a well-founded impression of the erection process.

The first pylon of the new East Bavarian Ring of TenneT has been erected (picture: TenneT / screenshot taken from TenneT-video “TenneT Ostbayernring: Der Projektleiter stellt sich vor”, YouTube)

Linkup
> See TenneT tweet, in German (html)
> Watch video of the pylon construction (YouTube)

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GIS with Clean Air technology for Daxlanden

14.11.2019

In present-day gas-insulated high-voltage systems, sulfur hexafluoride (SF6) is commonly used as insulating gas. It has excellent electrical and chemical properties, but also a strong greenhouse effect. For reasons of climate protection, TransnetBW, one of the four German transmission system operators (TSOs), focuses on eco-efficient technical concepts. In November last year, the TSCNET shareholder launched a pilot project at its substation in Obermooweiler, northeast of Lake Constance, with the world’s first gas-insulated switchgear (GIS) at extra-high voltage level using a climate-friendly alternative gas technology.

TransnetBW has now commissioned the new construction of the switchgear for the 380kV substation in Daxlanden near Karlsruhe, where the existing open-air facility will be replaced by two new GIS. Here, the TSO has opted for the so-called Clean Air technology, which exclusively uses processed air as an insulating medium instead of SF6. This significantly reduces the greenhouse effect of the entire switchgear system. The new GIS facilities will be built and commissioned gradually over the next few years and the existing open-air installation will be dismantled during ongoing operation.

The Daxlanden substation is an important network node in TransnetBW’s transmission grid and the central link between two grid construction projects from the German national Grid Development Plan for electricity (NEP), which contains essential grid extension projects to realise the energy transition. “A successful energy transition requires an efficient and future-proof transmission grid,” explains Dr. Werner Götz, Chairman of the TransnetBW Executive Board. “The more we are pleased to be able to make an additional contribution to the environment and climate protection by using the innovative Clean Air technology in Daxlanden.”

TransnetBW will build two GIS with Clean Air technology in the substation Daxlanden (computer simulation of the reconstructed Daxlanden substation: TransnetBW)

Linkup
> See TransnetBW press release, in German (html)

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TYNDP 2020 Scenario Report

13.11.2019

The Ten-Year Network Development Plans (TYNDPs) are published every two years by the European Network of Transmission System Operators for Electricity (ENTSO-E) and for gas (ENTSOG) with the participation of the respective member transmission system operators (TSOs). The TYNDPs support the European Commission in selecting Projects of Common Interest (PCIs) to be subsidised by European funds.

An EU regulation requires the ENTSOs to develop scenarios for their TYNDPs, and with the TYNDP 2020 the ENTSOs have designed these scenarios jointly for the second time. This cooperation makes sense because the scenarios not only serve to test the future needs and projects of the electricity and gas infrastructure, but also to investigate the interactions between gas and electricity grids in order to assess the infrastructure of a hybrid energy system.

The supply and demand data obtained from TSOs have resulted in the “National Trends” scenario, the central policy-based scenario that takes into account Member States’ national energy and climate plans as well as EU climate targets. The “Global Ambition” and “Decentralised Energy” scenarios are developed as full energy scenarios (not only for gas and electricity) and are in line with the objective of the Paris Convention. “These scenarios represent a comprehensive, reliable and contrasted set of possible energy futures that will allow the ENTSOs to perform a sound assessment of European infrastructure projects in the TYNDPs,” comments Laurent Schmitt, Secretary General of ENTSO-E.

The “TYNDP 2020 Scenario Report” featuring the draft versions of the scenarios has now been released by the ENTSOs and a formal public consultation on the scenarios will be launched shortly and will run until January. On 5 December, the ENTSOs will organise a public workshop in Brussels to present the TYNDP 2020 Scenario Report.

The ENTSOs have published their joint “TYNDP 2020 Scenario Report” (illustration using a picture by ENTSO-E/ENTSOG)

Linkup
> See ENTSO-E press release (html)
> Visit TYNDP 2020 Scenario Report website (html)
> Open TYNDP 2020 Scenario Report (pdf, 4.48MB)
> Visit Scenarios data visualisation platform (html)
> Register for Scenario workshop (html)

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New Amprion phase shifter in operation

06.11.2019

The German transmission system operators (TSOs) have to react with innovative technology to the changes in the German energy landscape caused by the shutdown of nuclear and other large power plants in the course of the energy transition. An important issue is the loss of reactive power, and an appropriate technological response are rotating phase shifters, which are highly efficient and flexible in the provision of reactive power to maintain voltage.

TSCNET shareholder Amprion has now commissioned such a high-performance system at its Illingen-Uchtelfangen substation in the German federal state of Saarland. It is the second rotating phase shifter in the Amprion grid after the TSO commissioned the first one in September 2018 in Oberottmarshausen (Bavarian Swabia). Amprion has invested €60m in the new state-of-the-art equipment, which keeps the transmission grid stable and thus further increases supply security in Saarland.

The commissioning ceremony was attended by Anke Rehlinger, Saarland Minister for Economic Affairs, Labour, Energy and Transport. Together with Amprion Managing Director Dr. Klaus Kleinekorte, General Manager of GE Grid Solutions Gerhard Seyrling and representatives of district and municipal politics, she pressed the “red button”, which symbolically put the facility into operation. Mrs Rehlinger commented on the new device: “Against the backdrop of the energy transition, grid stability and security of supply are becoming increasingly important. With the installation of the rotating phase shifter, Amprion is making an important contribution to the future of power transmission grids.”

Amprion has commissioned a new rotating phase shifter at the Illingen-Uchtelfangen substation (picture: Amprion;  Amprion CTO Klaus Kleinekorte and Saarland Minister Anke Rehlinger in the middle)

Linkup
> See Amprion press release, in German (html)

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Two transformers reach Garenfeld

05.11.2019

The last weekend was literally “heavy” for TSCNET shareholder Amprion, one of the four German transmission system operators (TSOs). Not one but two 276-tonne transformers were transported to Amprion’s Garenfeld substation in Hagen in North Rhine-Westphalia. It took both days of the weekend for the 30 kilometre stretch from the railway station to the substation. The special road transport units each had a total length of around 80 metres and together with the transformer each weighed 519 tonnes.

About 40 employees from various companies were involved in the transport during the two nights. At the end of August, the first of a total of five transformers had already been delivered to the substation. Amprion is currently planning to move the last two transformers to Garenfeld at the end of November.

Two transformers have been delivered to the Garenfeld substation operated by Amprion (picture: Amprion)

Linkup
> See last week’s announcement press release, in German (html)
> See Amprion tweet, in German (html)

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TenneT quadruples capacity across the Elbe

29.10.2019

A new Elbe crossing between the German federal states of Schleswig-Holstein and Lower Saxony for the transport of green electricity from North to South Germany has been completed. Tim Meyerjürgens, COO of the Dutch-German transmission system operator (TSO) TenneT, together with the State Secretaries Andreas Feicht and Enak Ferlemann, the Energy Ministers Olaf Lies (Lower Saxony) and Jan Philipp Albrecht (Schleswig-Holstein), has commissioned the new power line between the substations Hamburg/Nord (near Norderstedt/Schleswig-Holstein) and Dollern (Lower Saxony).

The new 380kV line of the TSCNET shareholder consists of four sections and is a replacement of existing lines with predominantly lower voltage levels to meet the requirements of the energy transition. A total of 110 masts were built or modified and 37 temporary masts were erected on several sections of the line. Almost all of them have now been dismantled. The installation of new conductor ropes at “Elbe Crossing 2” which has the highest pylons in Europe with a height of 227 meters, was also part of this demanding grid expansion project.

Tim Meyerjürgens explained on the occasion of the commissioning: “The extension of the 45-kilometre-long power line is an important component of the energy transition. This also includes the optimisation of the ‘Elbe Crossing 2’, the main artery in the three-phase transmission grid between Schleswig-Holstein and Lower Saxony, which serves as a bridge between the two largest wind power states in Germany.” With these reconstruction measures, Tennet has quadrupled the available capacity for the transmission of wind power in this area to 9.6 GW. The transit capacity between Denmark and Germany will also be increased, which is why the new connection is of central importance not only for the energy transition in Germany, but also at European level.

Picture: TenneT

TenneT has put new power line across the Elbe into operation (picture: TenneT; from left to right: TenneT COO Tim Meyerjürgens; Olaf Lies, Lower Saxony Minister for the Environment, Energy, Construction and Climate Protection; Jan Philipp Albrecht, Schleswig-Holstein Minister of Energy, Agriculture, the Environment, Nature and Digitalisation; Parliamentary State Secretary Enak Ferlemann; Andreas Feicht, State Secretary at the Federal Ministry for Economic Affairs and Energy)

Linkup
> See TenneT press release, in German (html)

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