Advanced lithium ion battery modeling and power stage integration technique

This paper focuses on the system modeling aspect of energy storage, power conversion and digital power control involved in non-renewable power systems. Lithium based batteries, the energy storage devices were modeled at different state of charges (SOC) using Electro chemical Impedance Spectroscopy (EIS). EIS based impedance measurements were fitted to a standard electrochemical battery model. The AC impedance model of the battery was integrated to the power supply control loop. The battery impedance changes with SOC of the battery and its effect on the control loop was observed. Based on the battery impedance based control loop performance, a dynamic compensation technique was proposed to optimally stabilize different control loops in the battery charging cycle. The system model and design aspects were verified using a synchronous buck based charging system.