LUẬN VĂN - Forward converter for solar power applications


Most solar arrays used today are connected in series and have tremendous power  losses in partially shaded conditions.  This document explores photovoltaic arrays in a  parallel connection to reduce the power losses in other solar cell connected applications.  
The two main issues with any photovoltaic arrays are solar modules being shaded and the efficiency of the power converters used within the solar array.  This thesis concentrates  on alleviating these problems with the development of a two phase dc to dc forward  converter with a snubber circuit as well as connecting a solar array in parallel to increase  the performance in partially shaded conditions.  This work illustrates a fully functional  forward converter that boost the input voltage within a solar array.  The experiments  include efficiency tests at certain voltage within the specifications as well as outdoor  solar testing in sunny and partially shaded conditions.  These tests illustrate that in a  parallel connected array, the shaded solar module does not have a dominating effect on  the overall output power of the combination, but rather the converter’s efficiency is the  main factor of the performance of the array. 

ABSTRACT ....................................................................................................................... iii
ACKNOWLEDGMENTS ................................................................................................. iv
LIST OF ILLUSTRATIONS ............................................................................................ vii
LIST OF TABLES ...............................................................................................................x
NOMENCLATURE .......................................................................................................... xi
SECTION
1. INTRODUCTION ....................................................................................................1
1.1 MOTIVATION ..................................................................................................... 1
1.2 SOLAR ARRAY OVERVIEW ............................................................................ 2
1.3 FORWARD CONVERTER ................................................................................. 6
1.4 VOLTAGE MODE CONTROL ........................................................................... 9
1.5 STRUCTURE OF THESIS................................................................................. 11
2. FORWARD CONVERTER DESIGN ....................................................................12
2.1 NEW FORWARD CONVERTER TOPOLOGY ............................................... 15
2.2 SELECTED COMPONENTS FOR FORWARD CONVERTER ...................... 18
2.3 TRANSFORMER DESIGN ............................................................................... 21
2.4 TRANSFORMER CALCULATED CORE LOSS ............................................. 29
2.5 TRANSFORMER CONSTRUCTION ............................................................... 33
3. RESULTS ...............................................................................................................38
3.1 SIMULATION PROCEDURE AND RESULTS ............................................... 38
3.2 EXPERIMENTAL RESULTS............................................................................ 43
4. CONCLUSION .......................................................................................................70
4.1 SUMMARY OF RESULTS ............................................................................... 70
4.2 EXTENSIONS OF PROJECT ............................................................................ 70
APPENDICES
A. PRINTED CIRCUIT BOARD DESIGN ............................................................. 72
B. SOLAR RESULTS TABLES .............................................................................. 78
BIBLIOGRAPHY ..............................................................................................................88
VITA ..................................................................................................................................91

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