Negative Sequence Current Control in Wind Power Plants With VSC-HVDC Connection

Large offshore wind power plants may have multi-MW wind turbine generators (WTG) equipped with full-scale converters (FSC) and voltage source converter (VSC) based high voltage direct-current (HVDC) transmission for grid connection. The power electronic converters in the WTG-FSC and the VSC-HVDC all...

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Bibliographic Details
Published in:IEEE transactions on sustainable energy 2012-07, Vol.3 (3), p.535-544
Main Authors: Chaudhary, Sanjay K., Teodorescu, Remus, Rodriguez, Pedro, Kjaer, Philip Carne, Gole, Ani M.
Format: Article
Language:English
Subjects:
Current control
Full-scale converter
high voltage direct-current (HVDC)
HVDC transmission
Power conversion
Reactive power
second-order generalized integrator (SOGI)
sequence components
Voltage control
voltage source converter (VSC)
Wind power generation
wind power plant
wind turbine generator
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Summary:Large offshore wind power plants may have multi-MW wind turbine generators (WTG) equipped with full-scale converters (FSC) and voltage source converter (VSC) based high voltage direct-current (HVDC) transmission for grid connection. The power electronic converters in the WTG-FSC and the VSC-HVDC allow fast current control in the offshore grid. This paper presents a method of controlling the negative sequence current injection into the offshore grid from the VSC-HVDC as well as WTG-FSCs. This would minimize the power oscillations and hence reduce the dc voltage overshoots in the VSC-HVDC system as well as in the WTG-FSCs; especially when the offshore grid is unbalanced due to asymmetric faults. The formulation for negative sequence current injection is mathematically derived and then implemented in electromagnetic transients (EMT) simulation model. The simulated results show that the negative sequence current control mitigates the power oscillations and therefore limits the dc voltage excursions in the VSC-HVDC system during the asymmetric faults.
ISSN:1949-3029
1949-3037
DOI:10.1109/TSTE.2012.2191581