Thomas D Geist

US Patent:

7633284, Dec 15, 2009

Filed:

Mar 8, 2006

Appl. No.:

11/276629

Inventors:

Michael R. Ingram - Harrison TN, US
Dale T. Bradshaw - Chattanooga TN, US
Thomas D. Geist - Knoxville TN, US
Haresh Kamath - Knoxville TN, US
Arshad Mansoor - Oak Ridge TN, US
Doni Nastasi - Knoxville TN, US
Scott Bunton - Powell TN, US

Assignee:

Tennessee Valley Authority - Knoxville TN

International Classification:

G01R 19/00
G01R 27/416
G01R 31/02
H02J 7/00

US Classification:

324 7611, 324426, 324537, 320167

Abstract:

A method and apparatus for automatically monitoring and controlling various parameters of individual ultracapacitor cells in a series string of such cells. These parameters are monitored, and a replacement charge current is delivered to any cell which has lost charge due to discharge either external or internal to the cell. Also, the application of this method and apparatus to energy storage systems for an electrical power transmission grid.