Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1997-03-25
1998-07-14
Berhane, Adolf
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 35, 323207, H02H 700
Patent
active
057814252
ABSTRACT:
The invention relates to the determination of short-circuit power (SCC1, SCC2) in an electric power network (N1, N2) for alternating current, which at a connection point (J1, J2) is connected to a converter installation (PL) for transmission of high-voltage direct current. A converter (SR1, SR2) comprised in the converter installation operates with a control angle (.alpha.1, .alpha.2). Power values (MQ(t'.sub.0)), (MQ(t'.sub.k), MQ(t'.sub.n)) of reactive power (Q1, Q2) consumed by the converter and voltage values (MU(t'.sub.0)), (MU(t'.sub.k), MU(t'.sub.n)) of the voltage (U1, U2) of the power network, sensed at the connection point, are formed and stored at a first calculating time (t'.sub.0) and at least one second calculating time (t'.sub.k, t'.sub.n). During a measurement interval (t1-t2) which at least partly coincides with the calculating interval (t'.sub.0 -t'.sub.n), the control angle (.alpha.1, .alpha.2) of the converter is given a control-angle addition (.DELTA..alpha.1, .DELTA..alpha.2). A power difference (.DELTA.Q'.sub.k) is formed in dependence on the difference of the respective power values, and a voltage difference (.DELTA.U'.sub.k) is formed in dependence on the difference of the respective voltage values. A measured value (MSSC1, MSSC2) of the short-circuit power of the power network is formed in dependence on the power difference and the first voltage difference.
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Asea Brown Boveri AB
Berhane Adolf
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