MODELING, ANALYSIS AND SIMULATION OF A DC GRID SINGLE ENDED PRIMARY INDUCTANCE CONVERTER FOR DC LOAD


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TABLE OF CONTENTS

Title Page
Abbreviations and Symbols
Abstract

CHAPTER ONE: INTRODUCTION
1.1       Overview
1.2       Statement of Problem
1.3       Aim and Objectives of the Study
1.4       Significance of the Study
1.5       Thesis Outline

CHAPTER TWO: LITERATURE REIVIEW
2.1       Introduction
2.2       Review of Fundamental Concepts
2.2.1    Definition of Power Converter
2.2.2    Terminologies used to describe converter operations
2.2.3    SEPIC basic concept
2.2.4    Bi-directional Converter basic concept
2.2.5    Permanent Magnet dc motor
2.3       Review of Similar Works
2.4       Conclusion

CHAPTER THREE: MATERIALS AND METHODS
3.1       Introduction
3.2       Solar Insolation Data for Zaria
3.3       MATLAB/Simulink
3.4       Methodology
3.5       Model derivation and Design Considerations
3.5.1 Model Derivation of a Complete System
3.5.2 Steady State Equations
3.5.3 Design Considerations
3.6       Simulation Equations
3.7       Conclusion

CHAPTER FOUR: RESULTS AND ANALYSIS
4.1       Introduction
4.2       Steady State Analysis
4.2.1    Harmonic Balance Technique Applied to SEPIC System
4.2.2    Steady State Calculations
4.3       Results
4.4       Conclusion

CHAPTER FIVE: CONCLUSION AND RECOMMENDATIONS
5.1       Summary
5.2       Conclusion
5.3       Limitation of the Study
5.4       Recommendations for Further Work
References



ABSTRACT

This research studied a circuit topology of a solar based Single Ended Primary Inductance Converter (SEPIC) system and a battery furnishing a permanent magnet dc motor with current via a dc grid. The complete model equations of the entire system were derived. Harmonic balance technique was used to determine the converter steady state and ripple quantities. Analyses investigating the relationship of the converter state variables as a function of its duty ratio were developed. Results show that operating the converter between 0 – 0.4 duty ratio give best system performances. On the other hand, results show that operating the converter above this range limits the converter optimal performance. The consequence of operating the system with duty ratios above 0.4 is that the ripples in the voltage and current waveforms increase. More so, results also show that for a steady state current of 12 A, for the permanent magnet dc motor in a period of low solar insolation, operating a Bi-directional converter at specific values of duty ratio causes the battery to discharge much faster compare to operating at duty ratio of 0.78. Two solar insolation data for Zaria (Lat 11.0670N Long 7.70E) was obtained from National Aeronautics and Space Administration (NASA) for a period of January to December 2013 and another ground level captured from Electrical & Computer Engineering Department using the data acquisition module (model TQ 140876-002) from August 17 to September 24, 2014. These insolation data from both stations were used to validate the efficiency of the proposed design. The targeted load demand of approximately 2441.43W was achieved. This represents 97.66 % of the load demand designed for in this research. The designed solar energy system contributed 70% of the power to the load, while the battery supplied 30% of the load demand power. An effective hybrid storage system based on solar and battery was achieved, which met the designed objective of this research.




CHAPTER ONE

INTRODUCTION

1.1 Overview

Solar fed systems can be used as an alternative source of power in meeting the electricity requirement of some rural dwellers not connected to the national grid in Nigeria. Their application area is limited to low power level such as street lighting, battery charging, irrigation, etcetera. The application area nevertheless is further limited to difficulty in terrain, mountainous hills, topography of these rural areas just to mention but few. A suggestion for meeting the electricity requirement of these rural dwellers and the need for high power application area is to use a solar fed SEPIC system viz a viz a storage energy system

(Thouthong, 2011; Veerachary, 2012). The purpose of the SEPIC is twofold: (i) To buck or boost varying output voltage from the solar module to a voltage suitable for meeting the requirement of the dc grid. (ii) Furnish the dc load with power via a dc grid linking the output of the converter and the dc load. However, the approach in (ii) requires a battery in mitigating the load power demand for short fall in solar insolation. To determine the performance of a dc grid SEPIC based solar electricity for dc load equipped with a battery, the method of harmonic balance technique is used in the analysis of the SEPIC state variables (Sangho et al, 2006). The method is different from that of averaging technique in that it basic application in addition to solving for average values of the SEPIC variables can further be use to:

(i)                 Predict ripples

(ii)                 design filter

(iii)             predict ripple dynamics

The harmonic balance technique consequent to the fact that it is assumed the converter variables is decomposed into average and fundamental ripple component. This allows for studying the steady state current from the output of the SEPIC. Furthermore, the current........


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