Electricity: power supply or regulation systems – For phase shift or control – Using transformer
Patent
1997-03-11
1998-11-24
Berhane, Adolf
Electricity: power supply or regulation systems
For phase shift or control
Using transformer
323207, G05F 504
Patent
active
058412670
ABSTRACT:
A power flow controller seeks to inject a voltage V.sub.ser on a transmission path between a first electrical area and a second electrical area, in order to cause a desired power flow into the second electrical area. The power flow controller (20) includes a series transformer (40), a regulating transformer (44), a rotary phase shifting transformer network (44), and a control system (46). The rotary phase shifting transformer network (44) includes a first rotary phase shifting transformer (102.sub.1) and a second rotary phase shifting transformer (102.sub.2). The first rotary phase shifting transformer and the second rotary phase shifting transformer have first terminals (windings of one of either rotors or stators) connected in parallel to a regulating winding 62) of the regulation transformer. Second terminals (windings of the other of rotors or stators) are connected in series with an excited winding (52) of the series transformer. The control system applies control signals to the first rotary phase shifting transformer and the second rotary phase shifting transformer to obtain desired phase angles .theta..sub.E1, .theta..sub.E2 between the rotor (110) and stator (112) of each transformer, and thereby achieve an effective phase shift .theta..sub.PFC and a voltage magnitude ratio T.sub.PFC between the first electrical area and the second electrical area.
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Berhane Adolf
General Electric Co.
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