Balanced Control System Based on Bidirectional Flyback DC Converter

Dongchen Qin, Shuai Qin (), Tingting Wang, Hongxia Wu and Jiangyi Chen
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Dongchen Qin: School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
Shuai Qin: School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
Tingting Wang: School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
Hongxia Wu: School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
Jiangyi Chen: School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China

Energies, 2022, vol. 15, issue 19, 1-25

Abstract: The inconsistency of the battery pack will cause the “barrel effect“ when the battery pack is working. The battery with lower power will first reach the discharge cut-off condition, resulting in the battery pack not being fully discharged, reducing the battery utilization rate. This paper uses the state of charge (SOC) as an equilibrium variable and the forgetting factor recursive least square–extended Kalman filter (FFRLS-EKF) method to estimate the SOC. Using a balanced topology based on a bidirectional impact direct current (DC) converter, the energy transfer can occur between any battery and only between batteries that need to be balanced, increasing energy utilization and the effect of equalization. The equalization system is simulated under various conditions, which proves the effectiveness of the equalization control system.

Keywords: lithium-ion battery; bidirectional flyback DC converter; balanced control strategy; availability energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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