Study on the negative effect mechanism of the active damping suppression strategy of the wind power grid-connected inverter based on the damping factor

With the development of new power system towards high proportion of new energy and high proportion of power electronic equipment, various problems caused by broadband oscillation will seriously affect the daily normal operation of power system. For the existing oscillation suppression strategy, due to the frequency width, there is a correlation between different frequency bands. When the oscillation of a specific frequency band is suppressed, it will affect the impedance of other frequency bands. The above phenomenon is called the negative effect of the oscillation suppression strategy. In this paper, by defining the damping factor, based on the generation mechanism of broadband oscillation, the damping characteristics of the full frequency band of the grid-connected system are analyzed, and the generation mechanism of the negative effect of the oscillation suppression strategy is studied,which provides a reference for the improvement of the control strategy and the optimization of the parameters, so as to realize the oscillation suppression of the full frequency band.