Siemens to install HVDC link to boost Manhattan’s power supply

Orlando, Fla., May 26, 2011 Siemens Energy is installing a turnkey high-voltage direct-current back-to-back link to connect the power supply networks of New Jersey and New York.

It is estimated that an additional 660 MW of controlled electric power will be transmitted via a high-voltage cable link across the Hudson River from New Jersey to boost the power supply of New York City.

The customer is Hudson Transmission Partners, LLC of Fairfield, Connecticut. The total contract value for the consortium of Siemens and Prysmian is about 400 million U.S. dollars.

Siemens’ scope of supply includes the open- and closed-loop controls for the HVDC system, the thyristor valves, eight converter transformers and the AC filters, as well as operation and maintenance for five years. The power link is scheduled to come on line in summer 2013.

The Siemens HVDC turnkey back-to-back link will not only connect the two power supply networks, it will also enable control of the power flow on the new power highway to New York.

The HVDC technology, with its fast control function, will also contribute toward stabilization of the connected systems, which is a key benefit in the event of grid disturbances or blackouts. Furthermore this high capacity power link will make sure to avoid bottlenecks on the power supply for New York.

The station with the HVDC back-to-back link will be built in Ridgefield, New Jersey, where it will be connected via a substation with New Jersey’s 230-kV power supply network.

A 345-kV high-voltage cable spanning a total distance of twelve kilometers, part of which will be laid under water in the Hudson River, will provide the connection to the point where the power is fed into New York’s system. The infeed point is located on 49th Street in Manhattan.

In July 2005, Siemens received an order from the same project developer to install an HVDC link between New Jersey and Long Island, which was commissioned in late June 2007.

The HVDC submarine cable link, also known as the Neptune project, transmits as much as 660 MW of electrical energy at a direct voltage of 500 kV. It provides a low-loss, eco-friendly power link between New Jersey’s power supply network and Long Island and meets the continuously increasing power demand on Long Island.

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