ŞEHİR e-arşiv

Characterization of a li-ion battery based stand-alone a-si photovoltaic system

Show simple item record

dc.contributor.advisor Tunaboylu, Bahadır
dc.contributor.author Vishkasougheh, Mehdi Hamid
dc.date.accessioned 2015-01-20T13:06:11Z
dc.date.available 2015-01-20T13:06:11Z
dc.date.issued 2015-01-20
dc.date.submitted 2014-04-29
dc.identifier.other 000110160002
dc.identifier.uri http://hdl.handle.net/11498/3023
dc.description Tezin basılısı İstanbul Şehir Üniversitesi Kütüphanesi'ndedir. en_US
dc.description.abstract The number of photovoltaic (PV) system installations is increasing rapidly. As more people learn about this versatile and often cost-effective power option, this trend will accelerate. This document presents a recommended design for a battery based stand- alone photovoltaic system (BSPV). BSPV system has the ability to have application in different areas. These include warning signals, lighting, refrigeration, communication, residential water pumping, remote sensing, and cathodic protection. The presented cal- culation method gives a proper idea for a system sizing technique. Based on application load, different scenarios are possible for designing a BSPV system. In this study a bat- tery based stand-alone system was designed. For the electricity generation part, A high efficiency silicon solar cells with a hetro-junction microcrystalline intrinsic thin layer was investigated. However, lack of availabilty of this type of panel made us to choose amorphous silicon panels. The electricity generation part is three a-Si panels, which are connected in parallel, and for the storage part LFP (Lithium Iron Phosphate) battery was used. The high power LFP battery packs are 40 cells each 8S5P (configured 8 series 5 parallel). Each individual pack weighs 0.5 kg and is 25.6V. In order to evaluate the efficiency of a-Si panels with respect to the temperature and the solar irradiation, cities of Istanbul, Ankara and Adana in Turkey were selected. Temperature and solar irra- diation were gathered from reliable sources and by using translation equations current and voltage output of panels were calculated. As a result of these calculations, current and energy outputs were camputed by considering an average efficient solar irradiation time value per day in Turkey. The calculated power values were inserted to a battery cycler system, and the behavior of high power LFP batteries in a time sequence of 7.2h was evaluated. The charging and discharging cycles were obtained and their behavior was discussed. According to the results, Istanbul has the lowest number of peak month’s energy, it followed by Ankara, and ultimately Adana has the highest number of peak months and energy storage. It was observed during the tests that, values up to 4 A was discharged by battery packages in a full discharge cycle depending on application and required load. This amount can be different depending on application and required load. Keywords: Photovoltaics, Amourphous Silicon, Li-ion Battery en_US
dc.description.tableofcontents Contents Declaration of Authorship ii Abstract iv Öz v Acknowledgments vii List of Figures x List of Tables xii Abbreviations xiii Physical Constants xv Symbols xvi 1 Introduction 1 1.1 Background of Photovoltaics . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Physical Theory of PV . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2 History of Photovoltaics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Amorphous Silicon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4 Types of Lithium-ion Batteries . . . . . . . . . . . . . . . . . . . . . . . . 7 1.5 Lithium Iron Phosphate (LiFePO4) Battery . . . . . . . . . . . . . . . . . 7 1.6 Battery Based Stand-alone PV Systems . . . . . . . . . . . . . . . . . . . 10 2 Rationale for Study 13 2.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.2 Problem Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3 Justification of the Study . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3.1 The application of BSPV in the world and Turkey . . . . . . . . . 15 2.4 Goal and Scope of the Study . . . . . . . . . . . . . . . . . . . . . . . . . 16 3 Theory and Calculations 18 3.1 High Efficiency Silicon Solar Cells with a Hetero-junction Microcrystalline Intrinsic Thin Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.1.1 Optimization of Emitter Layer . . . . . . . . . . . . . . . . . . . . 19 3.1.2 Optimization of the Intrinsic Layer . . . . . . . . . . . . . . . . . . 19 3.1.3 The Influence of TCO on the Effeciency of the Solar Cell . . . . . . 21 3.1.4 The Effect of Defects in c-Si(p) Layer on the Efficiency . . . . . . . 22 3.1.5 The Effect of a-Si(p+) BSF Doping Concentration on the Device Efficiency . . . . . . 23 3.1.6 The Effect of BSF Thickness . . . . . . . . . . . . . . . . . . . . . 24 3.1.7 The Effect of Temperature on the Efficiency . . . . . . . . . . . . . 24 3.2 Applied Silicon Solar Cell Material . . . . . . . . . . . . . . . . . . . . . . 26 3.3 Solar Irradiation Data of Istanbul, Adana, and Ankara . . . . . . . . . . . 27 3.4 The Formulas for Theoretical PV Calculations . . . . . . . . . . . . . . . . 27 3.5 Li Iron Phosphate Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.6 Battery Cycler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.6.1 Universal Battery Tester . . . . . . . . . . . . . . . . . . . . . . . . 32 4 Results and Discussion 39 4.1 PV Calculation Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.2 System Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4.3 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4.4 A-Si Panel Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4.5 LiFePO4 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 5 Conclusion 53 5.1 Future Research and Recommendations . . . . . . . . . . . . . . . . . . . 54 Bibliography en_US
dc.language.iso eng en_US
dc.rights info:eu-repo/semantics/openAccess en_US
dc.subject Photovoltaic Power Systems en_US
dc.subject Photovoltaic Power Generation en_US
dc.subject Fotovoltaik Güç Sistemleri en_US
dc.subject Fotovoltaik Enerji Üretimi en_US
dc.title Characterization of a li-ion battery based stand-alone a-si photovoltaic system en_US
dc.type Thesis en_US
dc.contributor.department The Graduate School of Natural and Applied Sciences of Istanbul Sehir University en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search ŞEHİR e-arşiv


Advanced Search

Browse

My Account

Statistics