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It is pointed out in this paper that the connection between DFVSCF (doubly-fed variable speed constant frequency) wind power generator and the grid is flexible, which means that by excitation regulation, the stator output voltage can fulfill the condition of grid-connection and the generator can be safely connected to the grid at variable speed. Using the method of field-oriented vector control, the...
The appropriate control strategy of grid-side converter (GSC) under unbalanced grid fault is important for wind power generator's fault-ride-through (FRT) capacity. Based on the basic principles of voltage space vector control, this paper studied the mathematical model of GSC under unbalanced grid conditions, and developed one efficient separation method of positive and negative sequence components...
The reactive power characteristics of doubly fed variable speed constant frequency (DFVSCF) wind power generator are important for grid's voltage stability and generator's low voltage ride-though (LVRT) capability. From the equivalent circuit of doubly-fed induction generator (DFIG), the balance equation of reactive power was deduced. Based on the balance equation, this paper first discussed the reactive...
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