Abstract
Hybrid Energy Storage System (HESS), which combines the battery and supercapacitor (SC), is a potential solution for the energy system of Electric Vehicles (EV). In this paper, a battery and SC hybrid system for small-scale EV with Energy Management Strategy (EMS) and power interface design is introduced. The energy management and power sharing strategy based on frequency-varying filter method is proposed, aiming to realize both high energy density output and high power density output from HESS. The design and control aspects of the converter as the interface of SC bank are introduced. The experiment results in reduced scale test validate that the energy management strategy is effective and the converter control satisfies the requirement of HESS in our hybrid EV prototype.
Highlights
As an energy storage device, Supercapacitor(SC) has many advantages such as high power density, quick charging and extended lifetime
Our research focuses on the application of supercapacitor to electric vehicles
Another solution to improve the energy system of Electric Vehicles (EV), is the usage of Hybrid Energy Storage Systems (HESS), which is based on the combination of two energy storage devices
Summary
As an energy storage device, Supercapacitor(SC) has many advantages such as high power density, quick charging and extended lifetime. Our laboratory has already developed an EV prototype which is only powered by SC in the past year It can be driven for 20 minutes after one time quick charging in 30 seconds [1]. In current stage, EV only powered by SC still has some problems such as the cost and the low energy density of SC bank. Another solution to improve the energy system of EV, is the usage of Hybrid Energy Storage Systems (HESS), which is based on the combination of two energy storage devices. The hybrid energy system using super capacitor and low cost lead acid batteries is considered for the design of our hybrid electric vehicle prototype.
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