Optimal determination of the size of energy resources in microgrids by considering uncertainties

Number of pages: 76 File Format: word File Code: 32222
Year: 2013 University Degree: Master's degree Category: Biology - Environment
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  • Summary of Optimal determination of the size of energy resources in microgrids by considering uncertainties

    Master's Thesis of Electrical-Power Engineering

    Abstract

    Microgrids are small-scale networks at the low voltage level that are used to supply thermal and electrical loads to small places and places that do not have access to the main power grid. Microgrids are used to supply energy to all types of consumers such as household, industrial and agricultural, and their cost estimation is based on pricing policies in the electricity market. Remote areas usually face the problem of not being connected to the main electricity grid. Microgrids can be a suitable solution for energy production considering environmental and economic issues for these areas. In this thesis, determining the optimal size of a grid-independent hybrid system is investigated. The studied hybrid system consists of wind turbines, solar arrays, fuel cells with hydrogen storage and diesel generator. The goals of this thesis are to minimize the cost of the system and reduce environmental pollution in the studied period. System costs include initial investment costs, replacement cost and annual maintenance cost of system components and diesel generator fuel consumption cost. GAMS software is used in this thesis, which is one of the most powerful commercial optimization software.

    This need drives human societies towards new and more productive resources. At the same time, industrialization and the increase in household consumption have led to an unpredictable increase in the demand for electrical energy. All these things cause the increasing production of gases that pollute the environment[1].

        Renewable energy sources[1] in recent decades, with the increase in the cost of fossil fuels and with the aim of producing clean energy, have received much attention from industrialized countries. This has led to many improvements in the exploitation of these resources; But renewable energy sources have variable behavior and as a result, production cannot be predicted correctly. In order to increase the reliability of the system, the use of diesel generators [2] to respond to the load demand in grid-independent systems is widely common [2]. However, the risk of scarcity and exhaustion of fossil energy sources, the increasing price of fossil fuels and the worsening of environmental issues due to the abnormal increase of various types of harmful compounds, including greenhouse gases, are also reasons for increasing the motivation of countries to use renewable energy sources.

         Using renewable resources, considering all the advantages and disadvantages, has created a branch in the electricity industry; which examines the limitations of hybrid systems operation [3], optimization of system operation [4], reduction of environmental pollution, improvement of the total cost of the system and in general optimal use of microgrids [5] and smart grids [6].

    Microgrids are small-scale networks At the low pressure voltage level, using CHP technology [7], they are used to supply heat and electric loads to small places and places that do not have access to the main electricity grid. In other words, microgrids are basically an active distribution network that consists of DG systems[8] with different loads at distribution voltage levels[3].

         Microgrids are used to supply energy to all types of consumers such as household, industrial and agricultural, and their cost estimation is based on pricing policies in the electricity market. The use of microgrids provides higher quality power[4], increases system reliability[9] and reduces costs, losses and pollution in C. Due to the use of new technologies such as wind turbines[10] and solar cells[11] in microgrids, as well as the random nature of renewable resources such as wind and sun, the management and safe and optimal operation of these networks has become one of the research priorities of researchers in this field[5].

     

     

    1.1 Definition of the problem

    Microgrids are used to provide energy to all types of consumers such as domestic, industrial and agricultural, and their cost estimation is based on pricing policies. It takes place in the electricity market. Remote areas usually face the problem of not being connected to the main electricity grid. Microgrids can be a suitable solution for energy production considering environmental and economic issues for these areas. In this thesis, determining the optimal size of a network-independent hybrid system is investigated. The studied hybrid system consists of wind turbines, solar array, fuel cells with hydrogen storage and diesel generator. The goals of this article are to minimize the cost of the system and reduce environmental pollution in the study period. System costs include initial investment costs, replacement cost and annual maintenance cost of system components and diesel generator fuel consumption cost. GAMS software, which is one of the most powerful commercial optimization software, is used in this thesis. The considered microgrid obtains its desired energy from wind turbine, solar arrays, fuel cell and diesel generator. The hydrogen storage includes an electrolyzer that stores the surplus power as a source of supply when the power production is reduced. The diesel generator acts as a backup source. During the hours of the day when wind turbines and solar arrays alone are not able to supply the load, the storage system contributes to supply the load by generating electricity. Also, many mixed systems are equipped with diesel generators to respond to the peak load in short times when the energy produced from the existing energy sources is not able to meet the demand. Theses will be reviewed. In the fourth chapter, the simulation results are presented and discussed. In the fifth chapter, conclusions and suggestions for further work are given. Remote communities, characterized by no connection to the main power grid. Microgrids used for supplying domestic, industrial and agricultural demands. Microgrids are a good solution for energy production, taking into account environmental and economic for remote communities. The studied hybrid system consisting of wind turbines, solar arrays, fuel cells, and hydrogen storage and diesel generator.

    The studies examine the method for operating the microgrid with the goal of optimizing the system both economically and environmentally. The cost of electricity depends on annual capital cost, operating costs of components and fuel prices.

    Gams is one of the strongest commercial software optimization software has been used for simulation.

  • Contents & References of Optimal determination of the size of energy resources in microgrids by considering uncertainties

    List:

    1. Chapter One: Preface. 1

    1.1 Preface 2

    1.2 Definition of the problem. 4

    2. Chapter Two: Introduction of microgrid components and research background. 6

    2.1 Introduction of micro-networks 7

    2.2 Review of previous works. 9

    2.3 Introduction of distributed generation technologies in microgrids 12

    2.3.1 Non-renewable distributed generators. 14

    2.3.1.1 Piston engines (reciprocating) 14

    2.3.1.2 Fuel cells. 17

    2.3.1.3 Gas turbines. 20

    2.3.1.4 Microturbines 21

    2.3.2 Distributed renewable generators. 22

    2.3.2.1 Solar energy. 22

    2.3.2.2 Photovoltaic system. 24

    2.3.2.3 Wind power plants. 26

    2.3.2.4 Hydropower plants. 28

    2.4 Storage system in microgrids 29

    2.4.1 Storage pump energy storage system. 30

    2.4.2 Superconducting magnet energy storage system 31

    2.4.3 Compressed air energy storage system 32

    2.4.4 Supercapacitor energy storage system. 33

    2.4.5 Hydrogen-based energy storage system. 33

    2.4.6 Thermal energy storage. 34

    2.5 Effects of microgrids in the system. 35

    2.5.1 Microgrids and their effects on power quality. 35

    2.5.2 Microgrids and its effects on the cost of production power. 36

    2.5.3 Effects of microgrids on the environment. 37

    3.Chapter 3: Definition of the objective function based on the economic model. 40

    3.1 Introduction 41

    3.2 The economic model of the studied system. 42

    3.2.1 Initial investment cost (ACC) 43

    3.2.2 Annual replacement cost (ARC) 44

    3.2.3 Annual fuel cost (AFC) 44

    3.2.4 Maintenance cost (AOC) 44

    3.3 Objective function and constraints of the problem. 45

    3.3.1 Limitations of the problem. 46

    3.3.2 Algorithm based on the scenario for the uncertainty of the generated power from wind turbine and solar array. 47

    4. Chapter four: simulation results. 49

    4.1 Simulation results. 50

    4.2 Specifications of microgrid components. 50

    4.3 Load of the studied area. 51

    4.4 Production of renewable energy sources. 52

    4.5 Possible scenarios. 53

    4.5.1 Determining the optimized size of units in the microgrid with uncertainty in the production of renewable units. 55

    4.5.2 Checking the cost in case of definite production. 56

    5. The fifth chapter: summary and conclusion. 57

    5.1 Conclusion. 58

    5.2 Suggestions for continuing work 59

    Resources and references. 60

    Abstract 65

    Source:

     

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Optimal determination of the size of energy resources in microgrids by considering uncertainties