Abstract
As the integration of Renewable Energy Sources (RES) increases in power grids, Inverter-based Resources (IBRs) are becoming more prevalent. Hence, there is a crucial need to integrate power-electronic devices, i.e. Voltage Source Converters (VSCs) to exchange power with the grid. Sources integrated with power electronics differ in principle from conventional Synchronous Machines (SMs) in the sense that they lack rotational inertia and utilize a driving circuit to synthesize the frequency. To control the operation of VSCs, prior work suggested control schemes that implement Virtual Inertia (VI) using assumptions of equating DC-link dynamics to the swing equation. The proposed work, based on the definition of "virtual frequency" for VI synthesis and damping, derives a mathematical relation between the swing equation and the mismatch of power between the converter's DC and AC sides, for a more fundamentally accurate emulation of the rotor dynamics. The proposed method has demonstrated promising results regarding the scheme's effectiveness in damping frequency oscillations following disturbances in MATLAB/Simulink® simulations.