Electric power conversion systems – Current conversion – With interphase transformer
Patent
1995-09-11
1997-09-09
Wong, Peter S.
Electric power conversion systems
Current conversion
With interphase transformer
323208, H02M 702, G05F 170
Patent
active
056662777
ABSTRACT:
A series-compensated converter station in an installation for transmission of high-voltage direct current is connected to an alternating-voltage network (N) with three phases (A, B, C, respectively). The converter station comprises at least two direct-voltage series-connected six-pulse converter bridges (SR1, SR2, respectively), a three-phase transformer coupling with two secondary windings (SW1, SW2, respectively), and a star-connected primary winding (PW) with a neutral point (NP) connected to ground as well as a series capacitor unit (CN) for each one of the three phases. Each one of the converter bridges is connected to a respective secondary winding and the primary winding is connected to the alternating-voltage network via the series-capacitor units. The transformer coupling exhibits a high impedance to zero-sequence currents through the primary winding of the transformer coupling.
REFERENCES:
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patent: 4837671 (1989-06-01), Wild et al.
patent: 4858100 (1989-08-01), Tatara
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patent: 5414612 (1995-05-01), Bjorklund
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patent: 5499178 (1996-03-01), Mohan
International Search Report; PCT/SE 95/01020; dated 26 Apr. 1996.
Bjorklund Per-Erik
Holmgren Tommy
Jonsson Tomas
strom Urban
Asea Brown Boveri AB
Vu Bao Q.
Wong Peter S.
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