In order to provide long distance capacity and secure the minimization of a cost function for electric vehicles, a new hybrid energy storage system for electric vehicle is create in this paper. For the hybrid energy storage system, the paper suggest an optimal control algorithm create using a Li-ion battery power dynamic limitation rule-based control based on the SOC of the super-capacitor. At the same time, the magnetic integration technology adding a second-order Bessel low-pass filter is introduced to DC-DC converters of electric vehicles. As a result, the size of battery is reduced, and the power quality of the hybrid energy storage system is increase. Finally, the efficiency of the proposed method is confirm by simulation and experiment.
- Hybrid energy storage system
- Integrated magnetic structure
- Electric vehicles
- DC-DC converter
- Power dynamic limitation
Fig.1 Topology of the hybrid energy storage system
EXPECTED SIMULATION RESULTS:
(a) Power command and actual power
(b) Power of the super-capacitor and Li-ion battery
Fig.2 Simulation results of the proposed HESS
- (a) Battery current
(b) Super-capacitor current
(c) Load current
- (d) Load voltage
Fig.3 Simulation results of the proposed HESS applied on electric vehicles
In this paper, a new hybrid energy storage system for electric vehicles is create based on a Li-ion battery power dynamic limitation rule-based HESS energy management and a new bi-directional DC/DC converter. The system is compared to traditional hybrid energy storage system, showing it has significant advantage of reduced volume and weight. Moreover, the ripple of output current is reduced and the life of battery is improved.
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