Phase-shifting transformer system

Details Phase-shifting transformer system Phase-shifting transformer system

1991-08-08

1992-11-24

Stephan, Steven L.

Electricity: power supply or regulation systems

For phase shift or control

Using transformer

323216, 323218, 323255, G05F 504

Patent

active

051665972

ABSTRACT:
A faster, more controllable phase-shifting transformer system is provided, along with a method of retrofitting and upgrading a preexisting system for faster operation, and a method of applying a desired phase shift to the voltage on a polyphase transmission line. A phase-shifting transformer set has series and regulating transformers coupled together by a switching network, An optional modulator modulates the phase shift voltage about a nominal level established by the switching network. The modulator may be a variable susceptance switched inductor or a switched capacitor, or a variable source device, such as a voltage source inverter device or a synchronous condenser. A thyristor augmented switching network may have a pair of thyristor valves augmenting a reversing switch, or a thyristor augmented load tap changer for varying the phase shift discreet step magnitude. Continuous control over the effective phase shift is obtained by partial conduction control of a thyristor valve with a harmonic filter in parallel with each excited winding of the series transformer, and by including a harmonic filter across the ends of regulating winding of the regulating transformer.

REFERENCES:
patent: 3652925 (1972-03-01), Yamana
patent: 3944913 (1976-03-01), Kugler
patent: 4013942 (1977-03-01), Boshnyaga
patent: 4469997 (1984-09-01), Curtiss
P. Wood, et al., "Study of Improved Load-Tap Changing for Transformers and Phase-Angle Regulators," EPRI Report No. EL-6079, Nov. 1988.

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