Droop control method in power converter system for balancing state-of-charge of energy storage units in EV

Abstract

A proficient power management between proposed multiple battery units in an EV is entailed to achieve the prolonged lifespan of batteries and to impede these from overcharging and overburdening during operation. At first, system configuration with three batteries has been developed for BEV architecture. Based on availability of their state-of-charge (SoC), power-sharing among these battery units is realised by applying a droop control method on power converter system (PCS), which acts as interfacing between battery units and powertrain of EV. To get optimal use of these supplies, balancing of SoCs among these parallel modules is performed by gradual equalisation of power using droop control. Droop control is implemented for both charging and discharging modes of operation using a bi-directional converter. SoC-based droop control method is performed on MATLAB/Simulink model included three energy storage units (ESUs) with PCS and simulation results at the constant speed of EV are shown to demonstrate and verify the approach.

Keywords

• distributed power generation
• battery powered vehicles
• power convertors
• power generation control
• energy storage
• secondary cells
• power converter system
• state-of-charge
• energy storage units
• ev
• proficient power management
• proposed multiple battery units
• prolonged lifespan
• batteries
• overcharging overburdening
• system configuration
• power-sharing
• charging discharging modes
• bi-directional converter
• soc-based droop control method