Preprint Article Version 1 This version is not peer-reviewed

A Smart Two-Stage Charging Strategy Implemented on a PV Module Array with a Simple MPPT for LiFePO4 Batteries

Version 1 : Received: 16 June 2018 / Approved: 18 June 2018 / Online: 18 June 2018 (15:55:50 CEST)

How to cite: Chen, P.; Chao, K.; Tsai, Y. A Smart Two-Stage Charging Strategy Implemented on a PV Module Array with a Simple MPPT for LiFePO4 Batteries. Preprints 2018, 2018060277 (doi: 10.20944/preprints201806.0277.v1). Chen, P.; Chao, K.; Tsai, Y. A Smart Two-Stage Charging Strategy Implemented on a PV Module Array with a Simple MPPT for LiFePO4 Batteries. Preprints 2018, 2018060277 (doi: 10.20944/preprints201806.0277.v1).

Abstract

This paper aims to present a smart high speed battery charger, powered by a photovoltaic module array, for a LiFePO4 battery as a solar energy storage device. With a battery charging strategy, the presented battery charger involves a Buck converter as the core equipped with a simple maximum power point (MPP) tracker. Considering complexity reduction and easy hardware implementation, a constant voltage MPP tracking approach is adopted such that the maximum amount of output power can be delivered to the load in response to an arbitrary change in the solar radiation. A smart two-stage charging strategy, with a constant current mode followed by a constant voltage mode, is employed in such a way that the battery charge process can be accelerated largely, while the damage caused by overcharging can be prevented. In the end, the performance of this proposal is validated experimentally.

Subject Areas

battery charger; photovoltaic module array; LiFePO4 battery; Buck converter; maximum power point tracker; smart two-stage charging strategy

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