2017-07-20
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Wind Energy Keyword: "DC grid"

Latest Wind Energy News

  • Newlist_logo.siemens
    Siemens receives major order from TenneT for DolWin6 offshore grid connection 07/17/2017
    ... to supply technology for DolWin6 DC grid connection in German North Sea Siemens will supply the technology for direct-current transmission / Dragados partner is responsible for building and installing the offshore platform / Six out of ten DC grid connections of the German North Sea were equipped by Siemens Siemens, DolWin6, TenneT, DC grid, transmission Siemens has received another order from the German-Dutch grid operator, TenneT TSO, for a grid connection for offshore wind power plants in the German waters of the North Sea. The company will supply the entire technology for efficient direct-current transmission for the "DolWin6" grid connection. The Spanish partner, Dragados Offshore S.A., is a leading general contractor in the energy sector and is responsible for construction and offshore installation of the associated platform. The French supplier Nexans will supply the direct-current cables. TenneT tendered the supply and laying of the cables separately, and these services are therefore not part of Siemens' scope of supply. The order placed with Siemens is valued in high three-digit millions euros range. After it is completed, DolWin6 will be able to transmit enough electricity to supply just under one million German homes. Commercial commissioning is scheduled for 2023. "DolWin6 marks a new milestone for the success of the energy transition. We are very pleased with the new order from TenneT for an offshore grid connection in the German waters of the North Sea," said Ralf Christian, CEO of Siemens' Energy Management Division. "This makes Siemens the technology partner in six out of ten DC projects. After BorWin3 and DolWin6 are commissioned, approximately 4.7 gigawatts of electrical power will be converted and transmitted to shore using Siemens technology alone. This is enough to supply just under five million homes." Siemens will supply the entire technology for efficient high-voltage direct-current transmission (HVDC) and will use DC CS direct-current compact switchgear for the first time. The new gas-insulated switchgear for 320 kilovolts (kV) requires as much as 95 percent less space compared to the current air-insulated solutions. If they are used on an offshore platform, the size of the platform can thus be reduced by approximately 10 percent. As a result, Siemens is significantly helping to lower the cost of grid connections for offshore wind farms and thus to the cost parity of offshore wind energy in general. The switchgear is manufactured in Siemens' switchgear factory in Berlin. Other components, such as HVDC transformers and converters for converting current, are produced in Siemens' factories in Nuremberg. The offshore platform is being built by our partner Dragados in Cadiz, Spain, and will then be transported to its installation site. Siemens will be responsible for complete construction of the HVDC onshore station in Emden, East Frisia, where the company already built the onshore converter for the BorWin3 direct-current connection earlier this year. The DolWin6 grid connection, which is around 90 kilometers in length, can connect multiple offshore wind turbines to the mainland. A number of offshore wind farms are competing for a connection to DolWin6 in an auction held by the German Gederay Network Agency. The Gode Wind 3 project has already been awarded a contract, and additional offshore wind warms will bid on the coveted grid connection in the next round of the auction. The 155 kV alternating current supplied by the wind turbines will be converted into 320 kV direct current on the DolWin6 offshore platform and transported to Hilgenriedersiel on the mainland via a 45-kilometer subsea cable. On the ocean, the cable will pass underneath the island of Norderney by means of horizontal bore holes. Once on land, the electricity will be transported by another 45-kilometer underground cable to Emden, East Frisia, where Siemens is building another converter station for converting the direct current back into three-phase current and feeding it into the high voltage grid. The HVDC Plus converter technology used by Siemens is a voltage-sourced converter of a modular multilevel converter design (VSC MMC). As a pioneer in VSC-MMC systems, Siemens is the technology leader in this field. In contrast to the classic HVDC variant, which can be used only in grids with sufficient short-circuit power, systems equipped with HVDC Plus facilitate the black start of island grids. This is an important prerequisite for operating the offshore grid. The modular VSC technology reduces complexity and thus the space required by the machines, which is essential particularly for use on offshore platforms. HVDC Plus also ensure an almost ideal sinusoidal alternating voltage and a smooth voltage in the direct voltage circuit. This eliminates the need to use harmonic filters. Siemens is now implementing a total of six out of ten DC North Sea grid connections for TenneT. The earlier projects were HelWin1 (576 MW) and HelWin2 (690 MW) off the coast of Helgoland, BorWin2 (800 MW) off the coast of Borkum and SylWin1 (864 MW) off the coast of Sylt. These grid connections have been placed into service successively since 2015; the BorWin3 (900 MW) and DolWin6 (900 MW) are currently being executed. The grid connections equipped with Siemens technology now have a total transmission power of 4.7 gigawatts – enough to supply just under 5 million homes. ...
  • Portuguese Association of Renewable Energies Award given to Bernardo Marques Amaral Silva 01/03/2017
    ... a successful accomplishment on mitigating an interconnected mainland grid frequency disturbance. In a second phase, DC grids control schemes were... developed and tested aiming at the operation of the DC grid during an AC mainland fault event (Fault Ride-Through  - FRT capability) and also to assure the operation of the DC grid following a permanent fault events or the disconnection of an onshore converter. According to the former MIT Portugal Program student, the major outcome of this project consists on allowing the management of more wind energy production and consequently increasing energy coming from renewable sources. The idea has already been tested in laboratory and its feasibility has been verified so, in a near future, the goal is to test it in an existing wind farm. The main objective of the second edition of the APREN Award was to support the best and most relevant academic Thesis held in Portuguese higher education institutions (related to renewable electricity) and to contribute to the disclosure and knowledge transfer between Research Centers and companies. ...
  • Newlist_windfair_logo_pos
    Netherlands: TenneT publishes Annual Report 2015 03/09/2016
    ... MW of offshore wind capacity to be operational by 2023. In Germany TenneT is investing in onshore AC infrastructure and offshore DC grid connections. The German onshore high-voltage grid is undergoing considerable expansion with a view to the energy transition (Energiewende). New or upgraded electricity connections are required to accommodate the strong growth in renewable energy generation, frequently at non-traditional locations. Over twenty large projects are currently in the planning or implementation phase. In addition, TenneT is currently planning two first of a kind DC connections on land to secure the power supply in southern Germany in the future. Integrated Annual Report 2015 More information about TenneT may be found in our Integrated Annual Report 2015, which is published at annualreport.tennet.eu. A shortenend version in Dutch is available at jaarverslag.tennet.eu. ...
  • Switzerland: ABB invests in most advanced cable-laying vessel for subsea installation and service 09/21/2015
    ... technologies. The award-winning Onboard DC Grid and power distribution solution, for instance, will use a single DC circuit for ship propulsion to reduce...
  • Newlist_logo.siemenswindpower
    Siemens receives grid connection order for Dudgeon offshore wind farm 09/04/2014
    ... as the clear market leader not only in offshore wind turbines but also in grid connections.” Siemens is also installing five DC grid connections with cable lengths of up to 200 kilometers (km) off the coast of Germany in the North Sea. This technology ensures efficient power transmission in wind farms situated at a great distance from the shore. The Dudgeon wind project is being build 32 kilometers north of Cromer, a city in the north of Norfolk County. The cable run extends 42 km offshore and another 47 km onshore. The scope of supply for the grid connection covers all necessary components, such as the offshore transformer substations which convert the wind power to 132 kilovolts (kV), as well as the onshore station which converts the electricity into 400 kV for feeding into the transmission grid. Grid connections and the associated service are part of Siemens’ Environmental Portfolio. Around 43 percent of its total revenue stems from green products and solutions. That makes Siemens one of the world’s leading providers of eco-friendly technology.   ...
  • Newlist_windeurope_primary_rgb
    EWEA Blog - Build a European supergrid for jobs and energy 12/18/2012
    ... to existing transmission systems. We propose to do this using many supernodes connected in a DC grid to allow multidirectional power flows depending...

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