DYNAMIC MODELING OF BATTERY ENERGY-STORAGE SYSTEM AND APPLICATION TO POWER-SYSTEM STABILITY

A useful and systematic dynamic model of a battery energy storage syst em (BES) is developed for a large-scale power system stability study. The model takes into account converter equivalent circuits, battery ch aracteristics and internal losses. Both charging mode and discharging mode are presented. The model is expressed in equivalent transfer func tion blocks, and it can be easily used in dynamic stability analysis o f a power system. To examine the dynamic behaviour of the model, appli cations to the damping of turbogenerator torsional oscillations are pe rformed. Active and reactive power modulation by the BES can be contro lled according to system requirements. Eigenvalue analysis and dynamic simulations are performed to demonstrate the damping effect of the BE S.