DISTRIBUTED FLOATING SERIES ACTIVE IMPEDANCES FOR POWER TRANSMISSION SYSTEMS

WIPO Patent Application WO2005034318

A3

Floating electrically isolated active impedance modules are formed to attach to power transmission lines without breaking the lines such that the power line forms a secondary of the main transformer of the module. Each module includes an electrical energy storage device and a switching circuit, such as a single phase inverter, connected to the storage device and to the main transformer primary winding. The inverter can be controlled to couple a selected voltage to the transmission line through the main transformer primary winding which can provide effective positive impedance, negative impedance, or a voltage at or near phase quadrature with the line current. Many active impedance modules may be distributed over a power system grid to allow control of the impedance of the power lines in the grid and to steer power through the grid, with each module electrically isolated from ground and from other phase lines of the transmission system.

DIVAN DEEPAKRAJ M (US)
SCHNEIDER ROBERT (US)
BRUMSICKLE WILLIAM E (US)

PCT/US2004/031122

October 13, 2005

September 23, 2004

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SOFT SWITCHING TECHNOLOGIES CO (US)
DIVAN DEEPAKRAJ M (US)
SCHNEIDER ROBERT (US)
BRUMSICKLE WILLIAM E (US)

H01F30/16; H01F38/14; H02J1/10; H02J3/18; H02M; (IPC1-7): H02J1/10

US4551700A	1985-11-05
US4829298A	1989-05-09
US5343139A	1994-08-30
US5585651A	1996-12-17
US6486569B2	2002-11-26

GYUGYI L. ET AL: "Static synchronous series compensator: a solid-state approach to the series compensation of transmission lines", IEEE TRANSACTIONS ON POWER DELIVERY, vol. 12, no. 1, 1 January 1997 (1997-01-01), pages 406 - 417, XP002990559

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