Wideband impedance characterization of energy storage within a diversified new energy cluster

The problem of broadband oscillations in different frequency bands caused by the interaction between power electronic equipment and the power grid, the modeling of the oscillation mechanism as well as its analysis need to be studied urgently. In this paper, forthe topology and impedance model of the energy storage system, we establish the frequency domain distribution model of the influence of phase-locked loop, voltage loop, current loop and filter link on the impedance characteristics, and analyze the influence of different controllers between different frequency bands in each frequency band. Finally, the developed model is validated by Matlab simulation platform and the effect of each band controller on the impedance characteristics is analyzed.