Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2002-06-19
2008-08-12
Vu, Bao Q (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S056020, C363S098000
Reexamination Certificate
active
07411797
ABSTRACT:
The invention relates to a converter provided with a resonant circuit (16), which comprises a control device (24) adapted, in connection with a commutation of the phase current (iph) from a semiconductor element of turn-off type of a first current valve (2, 3) to a rectifying member of a second current valve (3, 2) to effectuate a turn-on of the auxiliary valve (18) of the resonant circuit with a varaible time delay (td) after the turn-off of the first current valve, the converter comprising a member (35) for determining said time delay in dependence on the magnitude and the direction of the phase current (iph) and the magnitude and the direction of a determined unbalance so that the unbalance is corrected at least partly when the control device applies the time delay (td). The invention also relates to a method for controlling such a converter.
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Anders Lindberg; “PWM and Control of Two and Three Level High Power Voltage Source Converters”; Kungl Tekniska Hogskolan; Royal Institute of Technology, Department of Electric Power Engineering, Division of High Power Electronics, Stockholm, 1995; Sweden.
V. Pickert and C.M. Johnson; “DSP Controlled Auxiliary Resonant Commutated Pole Inverter Without Switch Status Sensors”; Seventh International Conference on Power Electronics and Variable Speed Drives (IEE Conf. Publ. No. 456); Sep. 21-23. 1998; pp. 650-655; ISBN 0-85296-704-7; London UK.
Yuan Xiaoming et al.; ARCPI Resonant Snubber for the Neutral-Point-Clamped (NPC) Inverter; Conference Record of the 1999 IEEE Industry Applications Conference;; Thirty-Fourth IAS Annual Meeting (Cat. No. 99CH36370), Proceedings of 34thAnnual Meeting of the IEEE Industry Applications; Oct. 3-7, 1999; pp. 1157-1164; ISBN 0-7803-5589-X; vol. 2; Phoenix, AZ.
Bijlenga Bo
Norrga Staffan
ABB AB
Franklin Eric J.
Venable LLP
Vu Bao Q
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