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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 traditional grid-connection strategies of doubly fed VSCF wind power generator need to detect the grid voltage for vector orientation. This paper presented one novel strategy which doesn't need voltage measurement. It designed a kind of grid virtual flux (GVF) observer without voltage sensors, which realized the initial flux estimation by the cooperation of grid side converter (GSC) when it start...
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...
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