Abstract
The transient fault characteristics of power systems undergo profound changes with the large-scale application of doubly fed wind turbines. Thus, the short-circuit current (SCC) contributed by doubly fed induction generation (DFIG) should be fully understood for the operation of power systems. However, the SCC of DFIG is difficult to analyze under excitation control when the voltage drops partially. A requisite analysis of the coupling between excitation control and the electromagnetic process under symmetric fault is conducted in this study. The transient disturbances in the control loop under fault are analyzed by constructing a vector dynamic model of rotor current. The simplified expressions of SCCs under different control modes are deduced. The characteristics of the SCCs are obtained from these simplified expressions. The effects of excitation control on transient behavior are analyzed considering that controls are usually designed under normal conditions. The theoretical analyses are validated by simulations.
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