Small-signal modelling and stability analysis of grid-following and grid-forming inverters dominated power system

• Main Authors: Li, Yaran, Fu, Long, Li, Qiang, Wang, Wei, Jia, Yubin, Dong, Zhao Yang
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2024
• Subjects: Engineering; Grid-Following Control; Grid-Forming Control
• Online Access: https://hdl.handle.net/10356/173552
• Institution: Nanyang Technological University

In this paper, the explicit state-space model for a multi-inverter system including grid-following inverter-based generators (IBGs) and grid-forming IBGs is developed by the two-level component connection method (CCM), which modularized inverter control blocks at the primary level and IBGs at the secondary level. Based on the comprehensive state-space model representing full order of system dynamics, eigenvalues of the overall system are thoroughly analyzed, identifying potential adverse impacts of not only grid-following inverters, but also grid forming inverters on the system small- signal stability, with the underlying principle of oscillations also understood. Numerical and simulation results validate effectiveness of the proposed methodology on IEEE benchmarking 39-bus system