Abstract At present, the research on short-circuit current characteristics of DFIG considering Crowbar protection generally assumes that Crowbar protection acts at the moment of fault. In fact, the Crowbar protection does not act instantaneously at the moment of fault because of the control system, but has a certain delay. In view of this practical problem, this paper divides the fault process into two stages, adopts the rotor flux linkage as a bridge between the two stages, and takes the last value of the first stage rotor flux linkage as the initial value of the second stage rotor flux linkage. In addition, the frequency components of stator and rotor flux linkage before and after fault are analyzed, and the analytical expressions of rotor flux linkage are deduced by Laplace and inverse Laplace transformations. Finally, the electromagnetic transient simulation model of DFIG is established on Matlab/Simulink platform. The simulation results verify the correctness of the expression of short-circuit full current of DFIG, and the effect of Crowbar protection action time on short-circuit current is also analyzed.
Fan Xiaohong,An Dechao,Sun Shiyun等. Three-Phase Short Circuit Current Characteristic Analysis of Doubly Fed Induction Generator Considering Crowbar Protection Action Time[J]. Transactions of China Electrotechnical Society, 2019, 34(16): 3444-3452.
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2019, Vol. 34 
