Control of a lithium-ion battery interfacing input-voltage-controlled boost converter with virtual impedance compensation technique

Lithium-ion batteries are becoming increasingly popular for energy storage in various hybrid energy systems, hybrid ac/dc, micro-grid, e-mobility applications. However, due to the wide battery impedance range, the performance of lithium-ion battery interfacing dc-dc converter is affected, results in complicated task for design of this regulation. As the virtual impedance concept is increasingly used for the control of power electronic systems, this letter introduces virtual impedance into the Lithium-ion Battery interfacing boost converter controller, to reduce the impact of variable inner impedance. The proposed virtual-impedance based control structure, is derived with small-signal model of boost converter, and explained in detail in this letter. Finally, the performance of the strategy is verified on a lithium-ion battery pack equipped dc micro-grid.