Research on Fault Characteristics of Distribution Networks with Doubly-Fed Induction Generator Wind Turbines
The integration of wind power generation systems into the grid is random in terms of both location and power output.When a fault occurs in the distribution network,traditional three-stage current protection devices are no longer applicable,which affects the performance of the relay protection system and may lead to malfunc-tions.This paper derives the fault current characteristics of a three-phase distribution network in the event of a symmetrical short-circuit fault,considering the mathematical model and control strategy of doubly-fed induction generator(DFIG)wind turbines.It also focuses on the fault current characteristics of DFIG wind turbines with low-voltage ride-through capability under fault conditions.A simulation model is built to verify the proposed algo-rithm.The simulation results show that,compared to traditional power systems,the current output of DFIG wind turbines exhibits characteristics such as amplitude attenuation,frequency shift,and high harmonic content.
doubly-fed induction generator(DFIG)fault current characteristicsdistributed power generation system
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