Method and circuit arrangement for shaping a.c. voltage

Details Method and circuit arrangement for shaping a.c. voltage Method and circuit arrangement for shaping a.c. voltage

1998-03-05

1999-05-18

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 79, 363 98, H02M1/12

Patent

active

059056436

ABSTRACT:
A method and a circuit arrangement for shaping any actual a.c. voltage characteristic into any reference a.c. voltage characteristic are described, which store the excess power in voltage overshoots in the form of a current in a current storage device using power electronic switching elements, and thus they compensate for the power deficiency when there is a voltage shortfall. The power electronic switching elements are driven by a digital automatic state machine through appropriate control pulses so that there is no fixed switching rate. The preferred field of application is for active filtering of the voltage of an electric three-phase or a.c. power supply system.

REFERENCES:
patent: 4670827 (1987-06-01), Schneider
patent: 5018058 (1991-05-01), Ionescu et al.
patent: 5793623 (1998-08-01), Kawashima et al.
"A Simple Control Strategy for Shunt Power Line Conditioner with Inductive Energy Storage," Humberto Pinheiro et al., IEEE, Power Electronics, MAUI, Bd. 2, Nov. 15, 1993, pp. 1093-1098.
"A Novel Control of a Current Source Active Filter for AC Power System Harmonic Compensation," Yoichi Hayashi et al., Conference Record of the Industry Applications Society Annual Meeting (IAS), IEEE, Part 1, Oct. 2, 1988.

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