Efficiency improvement of non-uniformly-aged PV arrays

Hu, Yihua, Zhang, Jiangfeng, Wu, Jiande, Cao, Wenping, Tian, Gui Yun and Kirtley, James L. (2017). Efficiency improvement of non-uniformly-aged PV arrays. IEEE Transactions on Power Electronics, 32 (2), pp. 1124-1137.

Abstract

The utilization of solar energy by photovoltaic (PV) systems have received much research and development (R&D) attention across the globe. In the past decades, a large number of PV array have been installed. Since the installed PV arrays often operate in harsh environments, non-uniform aging can occur and impact adversely on the performance of PV systems, especially in the middle and late periods of their service life. Due to the high cost of replacing aged PV modules by new modules, it is appealing to improve energy efficiency of aged PV systems. For this purpose, this paper presents a PV module reconfiguration strategy to achieve the maximum power generation from non-uniformly aged PV arrays without significant investment. The proposed reconfiguration strategy is based on the cell-unit structure of PV modules, the operating voltage limit of gird-connected converter, and the resulted bucket-effect of the maximum short circuit current. The objectives are to analyze all the potential reorganization options of the PV modules, find the maximum power point and express it in a proposition. This proposition is further developed into a novel implementable algorithm to calculate the maximum power generation and the corresponding reconfiguration of the PV modules. The immediate benefits from this reconfiguration are the increased total power output and maximum power point voltage information for global maximum power point tracking (MPPT). A PV array simulation model is used to illustrate the proposed method under three different cases. Furthermore, an experimental rig is built to verify the effectiveness of the proposed method. The proposed method will open an effective approach for condition-based maintenance of emerging aging PV arrays.

Publication DOI: https://doi.org/10.1109/TPEL.2016.2544842
Divisions: Engineering & Applied Sciences
Additional Information: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Funding: FP7 HEMOW and Marie Curie International Outgoing Fellowship
Uncontrolled Keywords: maximum power tracking,nonuniform aging,offline reconfiguration,output characteristics,photovoltaics (PVs),solar energy,Electrical and Electronic Engineering
Full Text Link: http://ieeexplo ... rnumber=7442880
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2017-02
Authors: Hu, Yihua
Zhang, Jiangfeng
Wu, Jiande
Cao, Wenping ( 0000-0002-8133-3020)
Tian, Gui Yun
Kirtley, James L.

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