Context:

Due to the low emissions of CO2 generated by electric systems, those solutions have been receiving attention from industries and academia. However, the electrical storage systems required for a large amount of applications must have high energy and power densities.

Method:

To meet those requirements, this paper proposes an active hybrid energy storage system formed by a battery, i.e. a device with a high energy density, and a capacitor, i.e. a device with a high power capability. The proposed solution also protects the battery by limiting the current derivative.

Results:

Two sliding-mode controllers are designed to regulate both the battery current and the load voltage. The design process guarantees global stability and safe battery operation.

Conclusions:

The controller avoids battery degradation caused by the high-frequency current components since the capacitor assumes those components as demanded by the load profile.

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