Method and apparatus for decoupling the active and reactive powe

Details Method and apparatus for decoupling the active and reactive powe Method and apparatus for decoupling the active and reactive powe

1988-12-21

1989-12-19

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 51, H02J 336

Patent

active

048886742

ABSTRACT:
A high-voltage d-c transmission system in which one of the converters is operated as a rectifier and the other as an inverter. A first cascade control which sets the rectifier control angle includes a superimposed active power controller and a subordinated d-c controller. A second cascade control which sets the inverter control angle includes a superimposed voltage/active power controller, a superimposed quenching angle control and a subordinated quenching angle controller. The setting signal of each of the two superimposed controllers are controlled in dependence on the control deviation of the other one of the superimposed controllers via a first or second pilot control for decoupling the cascade controls. The gain factors of the pilot control quantities depend on the operating point in such a manner that a small engagement of the pilot control variable exists for small control angles and a large engagement exists for large control angles.

REFERENCES:
patent: 3949291 (1976-04-01), Kanngiesser et al.
patent: 4494179 (1985-01-01), Inokuchi et al.
patent: 4517634 (1985-05-01), Sakai
patent: 4649466 (1987-03-01), Rogowsky
patent: 4685044 (1987-08-01), Weibelzahl et al.
patent: 4727467 (1988-02-01), Bendl et al.

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