The Comparison Study of System Damping Characteristics in Different Models of Doubly Fed Induction Generators
Abstract: The detailed model of DFIG, which includes the model of turbine, the model of rotor side control (RSC) control and the model of grid side converter (GSC) control. Then the detailed modes are reduced to the different degree to get the reduced modes. The reduced models include three different kinds: neglecting the effect of GSC control, which means that the GSC control is an ideal one; neglecting the effect of rotor transient based on the former kind; neglecting all the dynamic effects of DFIG, which are equivalent to the negative impedance. At last, the 10-generator 39-bus New Englandsystem is studied to analyze the damping characteristics of detailed model and different reduced models. The results show that: different models have different deviations of the oscillation mode; the more reduced of the model, the bigger error of the result. To a degree, the reduced models of neglecting GSC control and the zero-axis model can be used to replace the detailed model to analyze the damping characteristics of system.
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