In order to better study the dynamic response of wind turbines under certain grid voltage drop faults, a single 1.5 MW doubly-fed wind turbine (DFIG) was taken as the research object, and a Crowbar circuit was designed. By building a grid voltage drop simulation model, the dynamic responses of the terminal voltage, current, rotor current, output active power and reactive power, DC side voltage, and electromagnetic torque during the fault period were simulated. The corresponding control strategy was discussed, which provided a basis for further research on the control strategy under the low voltage ride-through standard, and also laid a foundation for the development of megawatt-class inverters. The measurement results show that this control method can enable DFIG to achieve uninterrupted operation under voltage drop faults, effectively improving the reliability of DFIG wind turbine operation.
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