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Power Electronics

Siemens Wins Order To Connect Lincs Offshore Wind Farm to the UK Grid

Siemens has been awarded a major order with Lincs Wind Farm Ltd to implement the grid connection for the Lincs offshore wind farm. The order volume for the grid connection is GBP101 million (approximately EUR120 million). Siemens Energy announced in Decemb er it is also supplying 75 of its high-performance 3.6 megawatts (MW) wind turbines for the wind farm. Construction is scheduled to start in late summer this year, with first generation planned for 2012. When operational, the Lincs wind farm could provide green power for approximately 200,000 homes in the East of England, contributing towards a significant reduction of carbon dioxide emissions.

The wind farm with an installed capacity of up to 270 MW will be installed 8 kilometres offshore, near Skegness, Lincolnshire on the east coast of the UK. Siemens will supply an offshore substation platform, which will bundle the power generated by the wind turbines before it is transported via high-voltage cable to the mainland. The substation will be equipped with two 240 MVA transformers as well as 132 kV high-voltage and 33 kV medium-voltage switchgear. The requisite protection and instrumentation and control equipment will also be installed on the platform.

The transformers on the substation platform will step up the 33 kV voltage from the wind turbines to a transmission voltage of 132 kV. High-voltage subsea cables will transport the power to the grid feed-in point, which is located at the Walpole 400 kV substation near King's Lynn. In addition to the offshore substation, an onshore substation is to be supplied, which will be equipped with two 300 MVA power transformers (400/132/13.9 kV), Siemens will install two filters, 132 kV and 400 kV switchgear, and a reactive-power compensation system in order to meet the requirements of the UK power supply network on the quality of the power infeed (Grid Code).

Siemens will use its new SVC Plus system for this purpose. SVC Plus operates with Siemens' innovative voltage-sourced converter (VSC) technology and can be continuously controlled with the aid of insulated-gate bipolar transistors (IGBTs). The central feature of SVC Plus, a refined statcom (static synchronous compensator) is its modular multilevel converter technology. By contrast with other self-commutated converter topologies, the voltage waveshape produced by SVC Plus is practically sinusoidal by virtue of the multilevel technology. This makes existing low-frequency harmonic filters, found in current solutions unnecessary, and significantly reduces the space requirements for the overall system.

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