Research on the Impact of Double-fed Wind Turbine Generator Drive System Modeling on Torsional Vibration Frequency

With the continuous increase of the wind power development strength in recent years, the rapid wind power development causes a series of problems. Based on the mechanism of the torsional vibration of double- fed wind turbine generator system, this paper researches the impact of the main drive system modeling method on the torsional vibration frequency. This paper first establishes mathematical models of three mass blocks and two mass blocks of the drive system, and then calculates the natural vibration frequency of two kinds of mathematical models by use of the small perturbation method and Dunkerley method, and also obtains the sensitivity of mechanical system parameters to the natural vibration frequency through calculation of the sensitivity, and finally obtains the difference of different mathematical models under different fault conditions through the numerical calculation and example simulation, thus providing a theoretical basis for correctly selecting the mathematical models.