Power conversion system, and a method of power conversion using

Details Power conversion system, and a method of power conversion using Power conversion system, and a method of power conversion using

1994-03-11

1995-03-07

Stephan, Steven L.

Electric power conversion systems

Current conversion

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

363 35, H02M 545

Patent

active

053964110

ABSTRACT:
A power conversion system for converting between a.c. and d.c. power has a pair of line commutated converters connected in series, and each is connected to a corresponding transformer, one of which transformers is YY connected and the other of which is Y.DELTA. connected. A pair of minimum voltage detectors generate minimum voltage signals, a first one of the minimum voltage signals being YY related and a second one of the minimum voltage signals being Y.DELTA. related. The power conversion system has a control circuit which generate two phase control signals for controlling the pair of line commutated converters respectively. When a fault occurs in a.c. or d.c. apparatus connected to the power conversion system, the control circuit generates the phase control signals on the basis of the first and second minimum voltage signals respectively. In this way, each of the line commutated converters are controlled by an independent signal, so that the power conversion of each is optimized.

REFERENCES:
patent: 3832619 (1974-08-01), Pollard
patent: 4330815 (1982-05-01), Konishi
patent: 4441032 (1984-04-01), Sakurai et al.
patent: 4862340 (1989-08-01), Inokuchi
patent: 4884182 (1989-11-01), Ando et al.
patent: 5272617 (1993-12-01), Nakamura

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