Erlangen, Germany, Aug. 21, 2008 -- After successfully completing the testing phase, Siemens Energy and the LÃ¼beck utility commissioned Germany's first shoreside power supply system for merchant shipping on August 21, 2008. The shoreside power supply, installed at the port of LÃ¼beck's Nordland dock, provides ships with an environmentally friendly and economical electrical power supply via the local medium-voltage system while they are berthed in port. The shoreside power supply has been built for the Swedish-Finnish paper, packaging and forest products company Stora Enso. The first customer of the shoreside power supply is the Swedish shipping line Transatlantic, which includes its paper-carrying ferries Transpaper, Transpulp and Transtimber.
The Transatlantic ships with their 400-V/50-Hz on-board systems have already been retrofitted for shoreside power supply systems at the port of Kemi in Finland and at the port of Gothenburg, Sweden. The ships have a cable drum with plug-in connector, a control system for the coupling process and a transformer on board. In LÃ¼beck, Siemens installed the matching connecting point on the dock. The LÃ¼beck utility created the connection to the medium voltage network as well as the connection between the transformer substation and the 6-kV socket outlet. For this purpose, the LÃ¼beck utility installed a 10-kV switchgear for connection to the utilities and a 6-kV switchgear for connection to the on-board system. A cast-resin insulated transformer rated at 2500 kVA was also installed in a concrete substation on the harbor site for separating the two networks electrically. Another component of the shore side connection is a smaller concrete substation with a 6-kV outlet at its side enabling power to be obtained from the dockside via the plug-in connector of the ship.
“As soon as the ships obtain the power they need via our shore side power supply system, they can switch off their diesel generators while they're berthed in port. These diesel generators not only produce electrical power but also exhaust emissions, soot, particulate matters and noise, so in this way these ships will help to reduce “harbor smog” which is becoming an increasingly serious environmental problem in many port cities,” said Ralf Christian, CEO of the Power Distribution Division in the Siemens Energy Sector.
The LÃ¼beck shore side power supply system operates at 50 Hz only because the on-board system of the ships uses the same frequency as the local power supply network. However, about 80 percent of the ships cruising the world's oceans are equipped with a 60-Hz on-board system. If these ships are to be supplied with shore side power, the frequency would have to be adapted. For this purpose, Siemens has developed the cold ironing system Siharbor, which enables on-board systems of ships and power supply systems on land to be connected together despite different voltages and frequencies.
The core element of this shore side power supply system is the Siplink system developed by Siemens (Siemens Multifunctional Powerlink), in which two converters are connected together by a DC link and are each connected to one power supply network. In this way, Siplink can not only feed a separate network from a distribution network but can connect power supply systems with different parameters and interconnect them. For example, at its shipyard in Flensburg, the Flensburger Schiffbau-Gesellschaft (FSG) utilizes Siplink when installing a vessel's on-board electrical system. Siplink provides a 60-Hz power supply with adjustable voltage, and can also be used later as a test load when checking the electrical system. Just as with the Siharbor solution, Siplink can link the electrical system of a ship while it's in the shipyard to the local power supply grid.
In order to use the Siemens solution, both the harbor and the ship must be specially equipped for the shore side power supply, among other things with a plug-in connection system. After connecting the plug-in connector of the ship, the automation system installed on shore can automatically initiate the start up of the shore side power supply system. The user dialog for this is conducted from the ship. The ship's power supply is not interrupted. Siplink is self-synchronizing and takes over the power supply within a few minutes. The diesel generators of the on-board power supply can then be shut down and the complete on-board network is supplied in an environmentally friendly way from the shore side power supply system. This energy efficient power supply solution for ships berthed in ports is an important feature of Siemens' environmental portfolio. In 2007, revenue from the products and solutions of Siemens' environmental portfolio was nearly EUR17 billion. The environmental portfolio is growing 10 percent annually; the revenue target for 2011 is EUR25 billion.
About Siemens Energy Sector
The Siemens Energy Sector is the world's leading supplier of a complete spectrum of products, services and solutions for the generation, transmission and distribution of power and for the extraction, conversion and transport of oil and gas. In fiscal 2007 (ended September 30), the Energy Sector had revenues of approximately EUR20.3 billion and received new orders totaling around EUR28.5 billion and posted a profit of EUR1.8 billion. The Energy Sector had a work force of 73,500 at the beginning of fiscal 2008. Further information is available at: www.siemens.com/energy.
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