Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1995-10-03
1997-04-15
Nappi, Robert
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 51, H02J 336
Patent
active
056216262
ABSTRACT:
An installation for transmission of high-voltage direct current comprises a first and a second converter (SR1, SR2, respectively), each one controlled by a separate piece of control equipment (CE1, CE2, respectively). Each one of the pieces of control equipment comprises a current controller (CC). The current controller of the second converter is supplied with a second current reference value (IOL2) and a current margin (IOM). The control equipment of the second converter comprises a function-forming member (11), which in dependence on an applied measured value (UD) of the direct voltage forms the current margin such that, when the direct voltage exceeds a first preselected voltage level (Udf), it assumes a first value (IOMf) and, when the direct voltage is lower than the first voltage level, it assumes a second value (IOMs), the magnitude of the second value being greater than the magnitude of the first value.
REFERENCES:
patent: 4459492 (1984-07-01), Rogowsky
patent: 4578743 (1986-03-01), Inokuchi et al.
patent: 4672519 (1987-06-01), Liss
Bjorklund Per-Erik
Jonsson Tomas
Juhlin Lars-Erik
Asea Brown Boveri AB
Han Y. J.
Nappi Robert
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