DC Microgrids

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The electric grid is on the threshold of a paradigm shift. In the past few years, the picture of the grid has changed dramatically due to the introduction of renewable energy sources, advancements in power electronics, digitalization, and other factors. All these megatrends are pointing toward a new electrical system based on Direct Current (DC). DC power systems have inherent advantages of no harmonics, no reactive power, high efficiency, over the conventional AC power systems. Hence, DC power systems have become an emerging and promising alternative in various emerging applications, which include distributed energy sources like wind, solar and Energy Storage System (ESS); distribution networks; smart buildings, remote telecom systems; and transport electrification like electric vehicles (EVs) and shipboard.
All these applications are designed at different voltages to meet their specific requirements individually because of the lack of standardization. Thus, the factors influencing the DC voltages and system operation needed to be surveyed and analyzed, which include voltage standards, architecture for existing and emerging applications, topologies and control strategies of power electronic interfaces, fault diagnosis and design of the protection system, optimal economical operation, and system reliability.
This groundbreaking new volume presents these topics and trends of DC microgrids, bridging the research gap on DC microgrid architectures, control and protection challenges to enable wide-scale implementation of energy-efficient DC microgrids. Whether for the veteran engineer or the student, this is a must-have for any library.

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Table of Contents

1 Cover

2 Title Page

3 Copyright

4 Preface

5 1 On the DC Microgrids Protection Challenges, Schemes, and Devices – A Review 1.1 Introduction 1.2 Fault Characteristics and Analysis in DC Microgrid 1.3 DC Microgrid Protection Challenges 1.4 DC Microgrid Protection Schemes 1.5 DC Microgrid Protective Devices (PDs) 1.6 Conclusions References

6 2 Control Strategies for DC Microgrids 2.1 Introduction: The Concept of Microgrids 2.2 Introduction: The Concept of Control Strategies 2.3 Control Strategies for DGs in DC MGs 2.4 Conclusions and Future Scopes References

7 3 Protection Issues in DC Microgrids 3.1 Introduction 3.2 Fault Detection in DC MGs 3.3 Fault Location 3.4 Islanding Detection (ID) 3.5 Protection Coordination Strategy 3.6 Conclusion and Future Research Scopes References

8 4 Dynamic Energy Management System of Microgrid Using AI Techniques: A Comprehensive & Comparative Study Nomenclature 4.1 Introduction 4.2 Problem Statement 4.3 Mathematical Modelling of Microgrid 4.4 Optimization Algorithm 4.5 Results 4.6 Conclusion References

9 5 Energy Management Strategies Involving Energy Storage in DC Microgrid 5.1 Introduction 5.2 Literature Review 5.3 Case Study 5.4 Conclusion References

10 6 A Systematic Approach for Solar and Hydro Resource Assessment for DC Microgrid Applications 6.1 Introduction 6.2 Methodology6.2.1 Data Collection 6.3 Result and Discussion 6.4 Conclusion References

11 7 Secondary Control Based on the Droop Technique for Power Sharing 7.1 Introduction 7.2 Voltage Deviation and Power Sharing Issues in Droop Technique 7.3 Design and Implementation of the Communication System 7.4 Conclusions References

12 8 Dynamic Analysis and Reduced-Order Modeling Techniques for Power Converters in DC Microgrid 8.1 Introduction 8.2 Need of Dynamic Analysis for Power Converters 8.3 Various Modeling Techniques 8.4 Reduce-Order Modeling 8.5 Illustrative Example with the Power Converter 8.6 Controllers for Power Converter 8.7 Conclusion References

13 9 Matrix Converter and Its Probable Applications 9.1 Introduction 9.2 Classification of Matrix Converter 9.3 Problems Associated with the MC and the Drives 9.4 Control Techniques 9.5 Basic Components of the Matrix Converter Fed Drive System 9.6 Industrial Applications of Matrix Converter 9.7 Summary References

14 10 Multilevel Converters and Applications 10.1 Introduction 10.2 Multilevel Inverters 10.3 Traditional Multilevel Inverter Topologies 10.4 Advent of Active Neutral Point Clamped Converter 10.5 Conclusion References

15 11 A Quasi Z-Source (QZS) Network-Based Quadratic Boost Converter Suitable for Photovoltaic-Based DC Microgrids 11.1 Introduction 11.2 Proposed Converter 11.3 Steady-State Analyses 11.4 Comparison with Other Structures 11.5 Converter Analyzes in Discontinuous Conduction Mode (DCM) 11.6 Simulation Results 11.7 Real Voltage Gain and Losses Analyzes 11.8 Dynamic Behavior of the Proposed Converter 11.9 The Maximum Power Point Tracking (MPPT) 11.10 Conclusions 11.11 Appendix References

16 12 Research on Protection Strategy Utilizing Full-Scale Transient Fault Information for DC Microgrid Based on Integrated Control and Protection Platform 12.1 Introduction 12.2 Topological Structure and Grounding Model of Studied Microgrid 12.3 Fault Characteristics of DC Microgrid 12.4 DC Microgrid Protection Strategy 12.5 Simulation Verification 12.6 Conclusion References

17 13 A Decision Tree-Based Algorithm for Fault Detection and Section Identification of DC Microgrid Acronyms Symbols 13.1 Introduction 13.2 DC Test Microgrid System 13.3 Overview of Decision Tree-Based Proposed Scheme 13.4 DC Microgrid Protection Using Decision Tree Classifier 13.5 Performance Evaluation 13.6 Conclusion References

18 14 Passive Islanding Detection Method Using Static Transfer Switch for Multi-DGs Microgrid 14.1 Introduction 14.2 Islanding 14.3 Static Transfer Switch (STS) 14.4 Proposed Scheme of Islanding 14.5 Flow Chart 14.6 Simulation Results 14.7 Experimental Results 14.8 Conclusion References

19 Index

20 Also of Interest

21 End User License Agreement

List of Tables

1 Chapter 1 Table 1.1 Grounding configurations comparison [11, 30, 71–75]. Table 1.2 DC microgrids protection challenges, problems and solution methodology... Table 1.3 DC microgrid protection strategies merits and demerits. Table 1.4 PDs assessment based on Cost, Efficiency, Reliability, and Fast operat...

2 Chapter 4Table 4.1 Cost coefficients.Table 4.2 Power ratings of DGs.Table 4.3 Optimization results.

3 Chapter 5Table 5.1 Classical approach of EMS.Table 5.2 Meta-Heuristic approach of EMS.Table 5.3 Artificial intelligence approach of EMS.Table 5.4 Model predictive, stochastic and robust programming approach of EMS.Table 5.5 DC microgrid subsystem’s parameters.

4 Chapter 6Table 6.1 Classification of hydro power plants in India.Table 6.2 Training and testing of ANN architecture data accuracy.

5 Chapter 7Table 7.1 Comparison between distributed secondary control techniques for DC Mic...Table 7.2 Parameters used in the Stability Analysis of Hybrid Control (Reprinted...Table 7.3 Simulation/Experimental Parameters of Hybrid Control (Reprinted with p...Table 7.4 Parameters used for the stability analysis on unique vs control (Repri...Table 7.5 Simulation/experimental parameters used in unique vs control. (Reprint...

6 Chapter 8Table 8.1 Modeling techniques with example.Table 8.2 Type of analyses carried out in modeling methods.Table 8.3 Time-domain characteristics.Table 8.4 Black box vs. white box modeling approach.Table 8.5 Example for Leverrier’s algorithm.Table 8.6 Techniques for model order reduction.

7 Chapter 9Table 9.1 Voltage gain in different types of three-to-three phase matrix convert...

8 Chapter 10Table 10.1 Switching states of DCMLI.Table 10.2 Switching states of FCMLI.Table 10.3 Switching states of seven-switch five-level ANPC inverter.Table 10.4 Advantages and disadvantages: a comparison of ANPC MLI with conventio...

9 Chapter 11Table 11.1 Comparative analyses.Table 11.2 Values of simulation parameters.Table 11.3 The parasitic elements of the proposed structure.Table 11.4 The values of the losses factors for the plot in Figure 11.14.Table 11.5 RMS value of the converter devices.Table 11.6 The parameter values of closed-loop simulation.

10 Chapter 12Table 12.1 Parameters of major components for the studied microgrid.

11 Chapter 13Table 13.1 Details of the data for training and testing of the algorithm.Table 13.2 Parameters during the training of the classifier.Table 13.3 Comparison of decision tree-based scheme with SVM and standalone kNN-...Table 13.4 Comparison of the proposed scheme with other algorithms.Table 13.5 Response of DT against the variation of fault resistance.Table 13.6 Performance analysis of section identifier (DT-3 and DT-4) under PG f...Table 13.7 Performance analysis of section identifier (DT-3 and DT-4) under PP f...Table 13.8 Comparative analysis of the proposed scheme with other reported techn...

12 Chapter 14Table 14.1 Different anti-islanding standards. (* Normal)Table 14.2 Evaluation of IDM on different parameters

List of Illustrations

1 Chapter 1 Figure 1.1 Unipolar DC microgrid architecture diagram. Figure 1.2 (a) Pole - Pole fault in a bipolar DC bus, (b) an equivalent circuit ... Figure 1.3 Short-circuit fault current in DC system standard approximation. Figure 1.4 V-I curve of CPLs (Negative impedance characteristic of CPL). Figure 1.5 Z-source breaker designs (a) classic design, (b) series connected des... Figure 1.6 Hybrid circuit breaker with forced commutation circuit [126]. Figure 1.7 Simple SSCB assembly is composed of an IGBT [118]. Figure 1.8 Solid state current interrupter [84].

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