Deadbeat Predictive Current Control Strategy of DFIG under Unbalanced Grid Conditions
Classic vector control is widely used in the control of doubly-fed induction generators(DFIG)due to its simplicity and stability.However,the parameter tuning process of classic vector control heavily relies on empirical values and is adversely affected by negative sequence currents under unbalanced grid conditions.This can lead to issues such as rotor overcurrent and overvoltage in the generator system,significant fluctuations in the DC bus voltage of the converter,and oscillations in electromagnetic torque.To address these drawbacks of classic vector control,a deadbeat predictive current control strategy is proposed.The mathematical model for the current loop of the DFIG rotor-side converter using deadbeat predictive current control is derived,allowing the system to obtain the optimal voltage vector within one control cycle.Finally,the effectiveness of the deadbeat predictive current control in mitigating rotor overcurrent and overvoltage,large DC-side bus voltage fluctuations,and electromagnetic torque oscillations under grid unbalanced grid conditions is validated using the MATLAB/Simulink software platform.
doubly-fed induction generatorsdeadbeat predictive current controlclassic vector controlrotor-side con-vertergrid voltage unbalance dips
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