Phase angle regulating transformer with a single core per phase

Details Phase angle regulating transformer with a single core per phase Phase angle regulating transformer with a single core per phase

1993-03-30

1995-10-24

Wong, Peter S.

Electricity: power supply or regulation systems

For phase shift or control

Using transformer

323217, G05F 502

Patent

active

054613000

ABSTRACT:
A dynamic phase angle regulator for enhancing the transient stability of a three phase AC power system includes a controller, a switching assembly of thyristor switches, and a single transformer coupled to a power line. The transformer includes a balanced three phase configuration of exciting windings coupled to nodes at each phase of a three phase transmission system. Each phase of the transformer further includes a pair of regulating windings electrically coupled to the node and magnetically coupled to a corresponding exciting winding. Each exciting winding induces a voltage on the corresponding pair of regulating windings. To provide a selected phase shift, the controller actuates the switching assembly in response to a transient event to add a voltage induced on the regulating windings to the line voltage. A method is also provided for regulating the phase angle in a polyphase power transmission system.

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"Solid-State Tap Changer Applied as Fast Phase Shifter," Study of Improved Load-Tap-Changing for Transformers and Phase-Angle Regulators, EPRI EL-6079 Project 2763-1, Final Report, Nov., 1988, Section 4, pp. 4-1 to 4-7.
Ooi et al., "A Solid-State PWM Phase-Shifter," IEEE/PES 1992 Winter Meeting, New York, Jan. 1992, p. 1-7.
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Appendix A: A schematic block diagram of the Brown Boveri Corporation (BBC) design discussed in the Background portion of the Specification, circa 1981.
Arnold et al., "Transient Stability Improvement Using Thyristor Controlled Quadrature Voltage Injection," IEEE Transactions on Power Apparatus and Systems, vol. PAS-100, No. 3, Mar. 1981, pp. 1382-1388.

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