A Study on a Solar Photovoltaic driven Irrigation System in Ethiopia

Table of Contents

CHAPTER 1- INTRODUCTION

1.1 Renewable and Solar Energy

1.2 Energy and Irrigation in Ethiopia

1.3 Research Review

1.4 Statement of problem

1.5 Main Objective of This Study

1.6 Significance of Study

1.7 Proposed System Overview

1.8 Scope of Work

1.9 Dissertation Layout

CHAPTER 2- SOLAR PV DRIVEN IRRIGATION SYSTEM

2.1 Rural Electricity in Ethiopia

2.2 Principles of Solar PV Powered Irrigation Technology

2.3 Solar PV Pumping Configurations

2.3.1 Direct Coupled Solar Driven Irrigation System

2.3.2 Battery Coupled Solar Driven Irrigation system

2.4 Proposed System

2.4.1 Physical Model of Proposed system

2.5 Photovoltaic (PV) Power System Components

2.5.1 Photovoltaic Array Structure

2.5.2 Power Conversion and Control System

2.5.3 Method of Irrigation System

2.5.4 Sprinkler Irrigation

CHAPTER 3- SYSTEM SIZING AND DESIGNING METHODOLOGY

3.1 Methodology

3.2 System Sizing

3.2.1 Study Site

3.2.2 Data collection

3.2.3 Determining required water

3.2.4 Water storage design

3.2.5 Solar Insolation

3.2.6 Pump Flow Rate

3.2.7 Total Dynamic Head

3.2.8 Motor and Pump

3.2.9 Sizing and Selecting of Solar PV Module

3.2.10 Sizing of Inverter

CHAPTER 4- SYSTEM MODELING IN SIMULINK

4.1 Modelling Solar PV

4.2 DC-DC Boost Converter Modeling

4.3 Modeling Maximum Power Point tracking

4.4 Invertor Modeling Using Simulink

4.4.1 LC Filter

4.5 Modeling Induction Motor

4.6 Modeling Centrifugal Pump

4.7 Mathematical Modeling Storage Tank

4.7.1 Tank Control

4.8 Complete Model of Solar Driven Irrigation System

CHAPTER 5- SIMULATION RESULT AND DISCUSSION

5.1 Result and Analysis

5.1.1 Solar Array Output Power and Voltage

5.1.2 Effect of Solar radiation on the output Power

5.1.3 DC- DC Boost converter Output Voltage

5.1.4 Three-Phase Voltage Source Inverter Simulation Result

5.1.5 Induction Motor Simulation Result

5.1.6 Water Flow Output Result

CHAPTER 6- ECONOMIC AND ENVIRONMENTAL ANALYSIS

6.1 Economic and Environmental Analysis of the System

6.2 Solar PV Driven Irrigation System

6.2.1 Diesel Systems

6.3 Life Cycle Operating Cost Analysis

6.3.1 Cost -Benefit analysis

6.4 Socio -Economic Advantage

6.5 Environmental analysis

CHAPTER 7- CONCLUSION

7.1 Conclusion

7.2 Scope of Future Work

Objectives and Topics

This study aims to design and model an efficient, cost-effective solar photovoltaic (PV) water pumping system for irrigation in Ethiopia, specifically for the Wonka site in Debre Markos. The research addresses the challenge of rural electrification and the reliance on inefficient, polluting diesel-powered irrigation by leveraging Ethiopia's abundant solar energy resources to support agricultural productivity and food security.

• Design and simulation of a solar PV driven irrigation system without batteries.
• Technical system modeling using MATLAB/Simulink and software tools like RETScreen and CROPWAT.
• Comprehensive economic evaluation comparing solar PV versus diesel-powered irrigation systems.
• Environmental impact assessment through CO2 emission reduction analysis.

Excerpt from the Book

Summary of Chapters

CHAPTER 1- INTRODUCTION: Provides the context of energy and irrigation in Ethiopia, identifying problems with existing systems and outlining the scope and objectives of the study.

CHAPTER 2- SOLAR PV DRIVEN IRRIGATION SYSTEM: Describes the components and design philosophy of the proposed solar irrigation infrastructure, including technical configurations and control mechanisms.

CHAPTER 3- SYSTEM SIZING AND DESIGNING METHODOLOGY: Details the systematic design approach, including site data collection, water requirement estimates, and the sizing of pumps, converters, and arrays.

CHAPTER 4- SYSTEM MODELING IN SIMULINK: Presents the mathematical modeling and simulation configurations for solar arrays, converters, pumps, and storage tanks using MATLAB/Simulink.

CHAPTER 5- SIMULATION RESULT AND DISCUSSION: Evaluates the system performance through various simulation outputs such as power, voltage levels, motor speed, and water flow rates.

CHAPTER 6- ECONOMIC AND ENVIRONMENTAL ANALYSIS: Analyzes the cost-benefit ratio and environmental impact of the solar system compared to traditional diesel-powered methods.

CHAPTER 7- CONCLUSION: Summarizes the key research findings and provides recommendations for future developments and optimizations of the system.

Keywords

Solar Photovoltaic, Irrigation, Ethiopia, MATLAB/Simulink, Rural Electrification, Renewable Energy, Diesel Alternatives, CO2 Reduction, Pumping System, Water Management, Life Cycle Cost, Economic Feasibility, Sustainability, Poverty Alleviation, DC-DC Converter.

Frequently Asked Questions

What is the core focus of this research?

The research focuses on the design and simulation of a solar-driven irrigation system tailored for the remote Wonka site in Ethiopia to replace traditional, expensive, and polluting fossil-fuel-based pumps.

What are the primary challenges addressed by this study?

The work addresses the energy crisis in rural Ethiopia, high maintenance costs of diesel pumps, lack of national grid access, and the vulnerability of smallholder farmers to unpredictable, seasonal rain-fed agriculture.

What is the primary objective of this dissertation?

The goal is to design an efficient and cost-effective solar PV-powered irrigation system, evaluate its technical and economic viability, and demonstrate a significant reduction in CO2 emissions compared to conventional systems.

Which scientific methods are utilized for this design?

The study employs mathematical modeling and simulations using MATLAB/Simulink, as well as analytical tools for water requirement estimation (CROPWAT) and environmental/economic viability assessments (RETScreen).

What content is covered in the main section of the document?

The main part of the work provides a detailed system design, including sizing for a 10-hectare farm, modeling of PV subarrays, DC-DC boost converters, three-phase inverters, induction motors, and a gravity-fed water storage system.

Which keywords best describe the paper's scope?

Key topics include Eco-friendly irrigation, Poverty alleviation, PV driven irrigation, and Rural Electrification.

Why did the author choose to exclude batteries from the proposed design?

Batteries were excluded because they increase initial investment costs and maintenance requirements. Instead, a cylindrical water storage tank was designed to provide water autonomy for two days.

How does this solar system compare to a diesel pump from an economic standpoint?

While the initial cost of the solar PV system is slightly higher, the life cycle operating and maintenance costs are 6.63 times lower than those of a diesel-powered pumping system over 20 years.

What is the significance of the "Total Dynamic Head" calculated in the study?

The Total Dynamic Head represents the total resistance the pump must overcome—combining vertical static lift and frictional losses—which is crucial for selecting the appropriate centrifugal pump for the site.