Modeling Inverters with Grid Support Functions for Power System Dynamics Studies

A significant amount of converter-based generation, such as wind and photovoltaic, is being integrated into the bulk electric power grid to fulfill the future electric demand. Such converter-based distributed energy resources (DERs) will be providing multiple grid support functions (GSFs) to support voltage and frequency control of the power system. In this paper, we present the development of a MA /Simulink-based simulation model to study power system dynamics whenDERs are equipped with GSFs. The simulation model of an inverter with GSFs is validated through comparisons against the characteristic curves for each function of the IEEE 1547-2018standard. The normalized root-mean-square-error (NRMSE) was calculated to be less than 2%. The developed model is then used in a sample power systems dynamics study under various operating conditions. Results show the exnected resnonse of inverfers with GSFs, properly supporting the grid voltage and frequency and maintaining the value within an acceptable range.