Study on Doubly-Fed Wind Turbine Based on Positive and Negative Sequence Double dq Current Control Strategy
In view of the problems existing in the double-fed wind motor system,the mathematical model of the double-fed wind motor and the electromagnetic torque of the generator are studied.Considering the voltage asymmetry of the power grid,in order to ensure the safe operation of the power system,we adopt the double dq current control strategy based on the positive and negative sequence rotation coordinate system,and the current of the power system is divided into two parts,respectively controlled by the positive and negative sequence rotation coordinate system,to further reduce the harm caused by the voltage imbalance of the power grid.The MATLAB/Simulink simulation proves the feasibility and effectiveness of the control strategy in solving the problem of power grid voltage imbalance.
grid asymmetryunbalanced grid voltagepositive and negative order separationgrid side converter
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