ISSN (print) 0914-4935
ISSN (online) 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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High-performance Energy Storage System Using Low-cost Sensors for a Photovoltaic and Battery Hybrid System

Pi-Yun Chen, Kuei-Hsiang Chao, and Yu-Sheng Tsai

(Received November 19, 2018; Accepted May 7, 2019)

Keywords: battery charger, photovoltaic module array, buck converter, maximum power point tracker, two-stage charging strategy

This paper presents a high-speed battery charger, powered by a photovoltaic (PV) 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 level of solar radiation. A two-stage charging strategy, with a temperature monitoring and constant current mode followed by a constant voltage mode, is employed in such a way that the battery charge process can be highly accelerated largely, while the damage caused by overcharging can be prevented. In the end, the performance of the proposed energy storage system using low-cost voltage, current and temperature sensors for a PV and battery hybrid system is validated experimentally.

Corresponding author: Kuei-Hsiang Chao




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