Variable-frequency transformer: Difference between revisions

Revision as of 14:16, 19 October 2011

Revision as of 14:25, 19 October 2011

Line 1:

A '''variable frequency transformer''' is used to transmit [[Electric power|electricity]] between two ([[asynchronous]] or synchronous) alternating current domains. The VFT is a relatively recent development (first deployed in 2004). Most asynchronous grid inter-ties use [[high-voltage direct current]] converters, while synchronous grid inter-ties are connected by lines & "ordinary" trtansfoemrerstransformers, but without the ability to control power flow between the systwemssystems.

Five small variable frequency transformers with a total power rate of 25 MVA were in use at [[Neuhof Substation]], Bad Sachsa, Germany for coupling power grids of former East and West Germany between 1985 and 1990.

Line 7:

AEP Texas installed a 100 MW VFT substation in [[Laredo, Texas|Laredo]], Texas, [[United States]] in early 2007. It connects the power systems of ERCOT (in the United States) to CFE (in Mexico). See [http://www.ettexas.com/projects/vft.asp The Laredo VFT Project]

XYZGE installed a 3 x 100 MW VFT substation in LyndenLinden, New Jersey, [[United States]] in 2009. It connects the power systems of PJM & NYSIO (in the United States). This installation is in parallel with three existing phase shifting transformers to regulate synchronous power flow. (See http://www.geenergyfinancialservices.com/LindenVFT_Inauguration.asp The Linden VFT Project])

(See [http://www.ettexas.com/projects/vft.asp The Laredo VFT Project])