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Appl. Sci. 2018, 8(12), 2520; https://doi.org/10.3390/app8122520

Lithium Titanate Battery Management System Based on MPPT and Four-Stage Charging Control for Photovoltaic Energy Storage

1
Department of Mechanical and Electrical Engineering, Longyan University, Longyan 364012, China
2
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Received: 26 October 2018 / Revised: 28 November 2018 / Accepted: 29 November 2018 / Published: 6 December 2018
(This article belongs to the Section Energy)
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Abstract

To overcome the unstable photovoltaic input and high randomness in the conventional three-stage battery charging method, this paper proposes a charging control strategy based on a combination of maximum power point tracking (MPPT), and an enhanced four-stage charging algorithm for a photovoltaic power generation energy storage system. This control algorithm ensures that the charging process is not affected by fluctuations in the photovoltaic power. The discharge bus waveform, push–pull discharge load switching waveform, push–pull circuit efficiency, and voltage and current regulation accuracies of the system were investigated. The experimental results show that the charging process is consistent with the designed four-stage charging control algorithm, the voltage and current regulation accuracies satisfy the charging requirements, the busbar remained stable during the battery charging and discharging switch, and the battery balancing effect was good. View Full-Text
Keywords: photovoltaic energy storage; MPPT; four-stage charging control algorithm; charge and discharge control photovoltaic energy storage; MPPT; four-stage charging control algorithm; charge and discharge control
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Fu, Z.; Fan, Y.; Cai, X.; Zheng, Z.; Xue, J.; Zhang, K. Lithium Titanate Battery Management System Based on MPPT and Four-Stage Charging Control for Photovoltaic Energy Storage. Appl. Sci. 2018, 8, 2520.

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