Research on Active Equalization Layered Cuk Topology Based on Fuzzy PID Control

This paper proposes and analyzes an equalization control strategy for series lithium-ion batteries based on active equalization and layered control when the charge and discharge states are inconsistent. It adopts a layered cuk equalization circuit structure and uses a fuzzy PID control algorithm to control the series battery pack which is controlled hierarchically. The inner layer control realizes energy balance between adjacent battery cells, and the outer layer control realizes energy transfer between adjacent balancing units. This paper builds a simulation experiment platform. By comparing the traditional series cuk balancing topology, the layered cuk balancing topology and the hierarchical cuk balancing topology based on fuzzy PID proposed in this paper, different balancing speeds are tested in the static, charging and discharging states, verifying the feasibility of the balancing scheme.