Negative Sequence Current Control in Wind Power Plants With VSC-HVDC Connection
Location: USA
Publication date: 2012-06-15
Published in: IEEE Transactions on Sustainable Energy, May 2012
ref. DOI: 10.1109/TSTE.2012.2191581

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External members

Chaudhary S,K. , Teodorescu, R. , Kjaer, P.C. , Cole, A.M.



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 theVSC-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 negativesequence current injection is mathematically derived and then implemented in electromagnetic transients (EMT) simulation model. The simulated results show that the negative sequencecurrent control mitigates the power oscillations and therefore limits the dc voltage excursions in the VSC-HVDC system during the asymmetric faults.


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