The SuperVAR dynamic synchronous condenser, developed by American Superconductor (AMSC; Westborough, Massachusetts, U.S.) in collaboration with Tennessee Valley Authority (TVA), has been chosen by R&D magazine as one of the most technologically significant products introduced over the past year. The SuperVAR, which was selected to receive the prestigious R&D 100 Award, stabilizes grid voltages, increases service reliability and can help maximize transmission capacity.

“We are delighted to accept this award that recognizes the importance of high-temperature superconductor technology in increasing the reliability of electric power transmission,” said Greg Yurek, president and CEO of AMSC. “This is particularly timely since the Energy Policy Act of 2005, recently signed by President Bush, highlights the need for increased investment in the reliability and modernization of the nation's transmission grid, including mandatory reliability standards. We expect SuperVAR machines to play a substantial role in meeting the new and enforceable reliability standards.”

SuperVAR machines are dynamic synchronous condensers, which are rotating machines, much like motors and generators. They use superconductor technology and serve as shock absorbers for power grids, dynamically generating or absorbing reactive power (measured in volt-amperes-reactive [VARs]). “SuperVAR machines will help protect the transmission system from voltage fluctuations and help ensure TVA's continued delivery of affordable, reliable power to the people of the Tennessee Valley.”

TVA installed AMSC's advanced prototype SuperVAR synchronous condenser in August 2004 at an electrical substation serving a steel mill operated by the Hoeganaes Corp. in Gallatin, Tennessee, U.S. The SuperVAR machine helps stabilize voltage on TVA's grid by injecting or absorbing reactive power to minimize the sudden and large voltage fluctuations caused by the mill during operation of its arc furnace.