Scheme for rapid adjustment of network impedance

Patent · Tue Jan 01 00:00:00 EST 1991

OSTI ID:867915

Vithayathil, John J ^[1]

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1. 3814 NE. 136th Pl., Portland, OR 97230

A static controlled reactance device is inserted in series with an AC electric power transmission line to adjust its transfer impedance. An inductor (reactor) is serially connected with two back-to-back connected thyristors which control the conduction period and hence the effective reactance of the inductor. Additional reactive elements are provided in parallel with the thyristor controlled reactor to filter harmonics and to obtain required range of variable reactance. Alternatively, the static controlled reactance device discussed above may be connected to the secondary winding of a series transformer having its primary winding connected in series to the transmission line. In a three phase transmission system, the controlled reactance device may be connected in delta configuration on the secondary side of the series transformer to eliminate triplen harmonics.

• Research Organization: BPA
• Assignee: Vithayathil; John J. (3814 NE. 136th Pl., Portland, OR 97230)
• Patent Number(s): US 5032738
• OSTI ID: 867915
• Country of Publication: United States
• Language: English

Related Subjects

scheme
rapid
adjustment
network
impedance
static
controlled
reactance
device
inserted
series
electric
power
transmission
line
adjust
transfer
inductor
reactor
serially
connected
back-to-back
thyristors
control
conduction
period
hence
effective
additional
reactive
elements
provided
parallel
thyristor
filter
harmonics
obtain
required
range
variable
alternatively
discussed
secondary
winding
transformer
primary
phase
delta
configuration
eliminate
triplen
secondary winding
power transmission
serially connected
electric power
transmission line
active element
active elements
primary winding
rapid adjustment
reactive elements
obtain required
thyristor controlled
reactive element
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