Control equipment for a series capacitor connected into an elect

Details Control equipment for a series capacitor connected into an elect Control equipment for a series capacitor connected into an elect

1995-05-17

1998-09-01

Shoop, Jr,, William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307102, 323211, H02J 324

Patent

active

058014594

ABSTRACT:
Control equipment (CE) for a series capacitor (1) connected into an electric power line (2) has a semiconductor valve (3), which is controllable in both directions, for connection in parallel with the capacitor. An inductor (4) is adapted to form, together with the capacitor, an oscillation circuit in which the semiconductor valve is included. The equipment has control members (PLL, TC) for firing the semiconductor valve for reversal of the capacitor charge and for control of the times (t.sub.p) for the zero crossings of the capacitor voltage (u.sub.C) such that these become substantially equidistant also in the presence of subsynchronous components in the power line current.

REFERENCES:
patent: 5202583 (1993-04-01), Larsen
patent: 5227713 (1993-07-01), Bowler et al.
patent: 5367197 (1994-11-01), Klerfors
patent: 5374853 (1994-12-01), Larsen et al.

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