Abstract:

This paper introduced leadacid battery classic first order model and topological structure of charging and discharging circuit. Control method of bidirectional converter under active and positive power source and V/f source accumulation system was studied. Base on the incident of micro grid failure caused by V/f source overcharged, a stable state of charge (SOC) control strategy based on island mode was indicated. Which is keeping low rate charge and discharge by controlling the SOC to slightly fluctuate around threshold. The simulation on EMTDC/PSCAD software proved the effectiveness. This strategy provided a solution for the stability of micro grid under island mode.

Key words:

leadacid battery, classic first order model, V/f source accumulation system, PQ source accumulation system, battery state of charge