TY  - EJOU
AU  - Liu, Qiang 
AU  - Zhou, Yongqiang 
AU  - Lu, Chaoyang 
AU  - Yan, Zhen 
AU  - Yan, Gangui 
AU  - Yang, Cheng 
AU  - Wang, Yupeng 

TI  - Low-Frequency Oscillation Analysis of Grid-Forming Energy Storage Converters Based on a Multi-Damping Path Model
T2  - Energy Engineering

PY  - 
VL  - 
IS  - 
SN  - 1546-0118

AB  - The increasing proportion of power generated by new energy has meant that grid-forming energy storage has become a key method for improving power grid flexibility. However, the small disturbance stability problem has become an important challenge. The issue is that grid-forming energy storage is prone to low-frequency oscillation under strong grid conditions. Therefore, this study proposes a multi damping torque model to analyze the small signal stability of grid-forming energy storage converters. The impact of grid strength, operating conditions, and control parameters on the damping characteristics of the low-frequency oscillation by the system was quantitatively evaluated. The results revealed the mechanism underlying the low-frequency oscillation associated with grid-forming energy storage under strong grid conditions and key factors controlling the low-frequency oscillation. The results also provide theoretical guidance for the tuning of grid-forming energy storage control parameters. The accuracy of the multi damping torque model and theoretical analysis were verified using the electromagnetic simulation results.
KW  - Multi-damping path; grid-forming energy storage; small signal stability; low-frequency oscillation

DO  - 10.32604/ee.2025.073028