A Comparative Study of Grid-Forming Controls and their Effects on Small-Signal Stability

• DOI: 10.36227/techrxiv.22006310
• Publication Date: 2023-02-13T18:18:42Z
• Authors: Yahya Lamrani; Frédéric Colas; Thierry Van Cutsem; Carmen Cardozo; Thibault Prevost; Xavier Guillaud

<p>This article provides a new take on the impact brought by Grid Forming (GFM) converters by showing that not all GFM converters improve the system stability with the same efficacy. It paper investigates the mechanisms behind converters driven stability and quantifies the stabilizing effect of grid-forming controls. The linearized state space model of different combinations of control strategies is analyzed in a multi-infeed system considering various operating points. Through a parametric sensitivity study and an examination of the participation factors of key eigenvalues of the linearized models, it is confirmed that grid-forming controls contribute to system stabilization. Moreover, this paper demonstrates that this stabilizing effect varies significantly depending on the specific grid-forming control implemented: whether a current control loop is used or not, notably impacts stability.</p>