Small-Signal Stability Analysis of a Vanadium Redox Flow Battery-based Energy-Storage System

This paper establishes the state-space model by integrating both electrical equivalent-circuit model and thermal equivalent-circuit model of a vanadium redox flow battery (VRFB)-based energy-storage system (ESS) of rated 5 kW/3 kWh for small-signal stability analysis. The steady-state analysis, eigenvalue analysis, and root-loci plots of the studied VRFB-based ESS under various values of charging current, temperature, and state of charge (SOC) are performed.