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access icon openaccess Control and operation of a hybrid HVDC integrating wind farm based on SB-MMC and LCC

To integrate offshore wind power, a hybrid high-voltage DC (HVDC) system consisting of the self-blocking modular multilevel converter (SB-MMC) and line commutated converter (LCC) is investigated. The SB-MMC is installed at the sending end to support the wind farm and the LCC is installed at the power grid side. The start-up strategy of the hybrid system is studied. To eliminate the transients during start-up, a virtual limiting resistor is introduced for the LCC and a grouping sequentially charging method is proposed for the SB-MMC. The DC fault behaviour and isolation of the hybrid system is analysed. The response during AC fault and commutation failure at LCC is considered. Finally, the feasibility of start-up, DC fault isolation and AC fault ride through of the hybrid HVDC system is verified by simulations in power systems computer-aided design/electro-magnetic transient design and control.

References

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      • 3. Jie, X., Zhao, C.Y., Tan, L., et al: ‘The hybrid HVDC transmission using line commutated converter and full bridge modular multilevel converter’. IET Renewable Power Generation Conf., 2013, pp. 14.
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      • 4. Xue, Y., Xu, Z.: ‘DC fault ride-through mechanism and improved topology scheme of C-MMC’, Proc. CSEE, 2013, 33, (21), pp. 6370.
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http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2017.0444
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content/journals/10.1049/joe.2017.0444
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