Modeling the inherent damping of high-power inverters

In order to decide whether passive or active damping is required in a three-phase inverter, a previous step is to assess the intrinsic damping of the system. However, few works focus on modeling this damping for DC/AC operation. This paper proposes two models to reproduce the damping sources: the simulation model, used to validate the system in large-signal, and the small-signal model, which can be employed for the controller design. Both models have been validated by means of experimental results for a 1.64 MVA inverter. This work was supported by the Spanish State Research Agency (AEI) under grants PID2019-110956RB-I00/AEI/10.13039 and DPI-2016-80641-R, and by the Public University of Navarre through a doctoral scholarship.