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Multilevel current reinjection self-commutated HVDC converter

Multilevel current reinjection self-commutated HVDC converter

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A new self-commutated AC–DC converter is proposed based on the reinjection of multilevel DC pulses via the mid-point of the series double-bridge converter using a GTO-switched multitapped single-phase transformer. The ideal reinjection waveform for complete elimination of the harmonic content of the AC-side current is derived and a practical approximation proposed to increase the pulse number of double-bridge converters to any multiple of 12. A 60-pulse configuration is analysed in detail to show effectiveness on both the AC and DC sides of the converter.

Inspec keywords: power transformers; power conversion harmonics; AC-DC power convertors; HVDC power convertors; harmonics suppression; switching convertors; thyristor convertors; bridge circuits

Other keywords: ideal reinjection waveform; AC-DC converter; self-commutated HVDC converter; harmonic elimination; DC pulses; multilevel current reinjection; multitapped single-phase transformer; double-bridge converter; GTO; gate turn-off

Subjects: Transformers and reactors; d.c. transmission; Power convertors and power supplies to apparatus

References

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      • Daher, S., Silva, R., Antunes, F.: `Multilevel current-source inverter: the switching control strategy for high-power application', Proc. of the 1996 IEEE IECON 22nd Int. Conf. on Industrial Electronics, Control and Instrumentation, 1996, 3, p. 1752–1757.
    2. 2)
      • Oguchi, K., Hama, H., Kubota, T.: `Multilevel current-source and voltage-source converter systems coupled with harmonic cancelling reactors', Conf. Record of the 1997 IEEE 32nd IAS Annual Meeting, IAS’97, 1997, 2, p. 1300–1308.
    3. 3)
      • J.F. Baird , J. Arrillaga . Harmonic reduction in DC-ripple reinjection. IEE Proc. Part-C , 294 - 303
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      • J. Arrillaga , M. Villablanca . 24-pulse HVDC conversion. IEE Proc.-Gener. Transm. Distrib., IEE Proc. C , 1 , 57 - 64
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      • J.-S. Lai , F.Z. Peng . Multilevel converters-a new breed of power converters. Ind. Appl., IEEE Trans. , 3 , 509 - 517
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      • Choi, N.S., Cho, J.G., Cho, G.H.: `A general circuit topology of multilevel inverter', Conf. Record of 22nd Annual IEEE Power Electronics Specialists Conf., 1991, 1991, p. 96–103.
    7. 7)
      • Villablanca, M., Arrillaga, J.: `High pulse HVDC transmission', Proc. of the 34th CIGRE, Int. Conf. on Large High-Voltage Electric Systems, Aug 30–Sep 5 1992, 1992, CIGRE, Paris, Fr, 1, p. 14–101.
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