Sensitivity Analysis and Small-Signal Stability of Grid Following Converters

This article presents a small-signal study, based on sensitivity analysis, of voltage source converter (VSC) operating as grid-following device. type operation is standard for integrating distributed energy resources directly into primary grid without considering the control over specific variables (e.g., and frequency), thus maximizing amount injected active power. The present study adopted classical vector-oriented linearization method averaged model; hence, this analysis limited to linear controls. main objective evaluate how each controller parameter influences system’s stability. To conduct an model in dq reference frame VSC was employed describe system dynamics equivalent state-space model. Afterward, stability analyzed through eigenvalues corresponding state matrix. numerical results demonstrate that problems VSCs converters are threefold: high value filter inductance, non-ideal impedance appears depending connection point, poor coordination parameters Kp controllers. These compared simple bifurcation matrix, which consists diagram describes variation when changes, proving their validity.