Advanced Hierarchical Control and Stability Analysis of DC Microgrids (Springer Theses)

Supervisor’s Foreword
Abstract
Acknowledgements
Contents
List of Figures
List of Tables
1 Introduction
	1.1 General Topic and Overview
	1.2 Motivation and Scope
		1.2.1 Challenges
		1.2.2 Aims and Objectives
		1.2.3 Contribution
		1.2.4 List of Publications
	1.3 Thesis Outline
	References
2 Literature Review
	2.1 Microgrid Components
		2.1.1 Power Converters
		2.1.2 DC Loads
	2.2 Hierarchical Control
		2.2.1 Primary Control
		2.2.2 Secondary Control
		2.2.3 Supervisory Control
	2.3 Microgrid Stability
		2.3.1 Stability of Droop-Controlled DC Microgrids
		2.3.2 Stability of DC Microgrids under Secondary Control
	2.4 Microgrid Protection
		2.4.1 Overcurrent Protection
		2.4.2 Overvoltage Protection
	2.5 Gaps in the Current Literature
	References
3 Notations and Theoretical Preliminaries
	3.1 Vector, Matrix and Function Notations
	3.2 Linear Matrix Analysis
	3.3 Elements of Graph Theory
	3.4 Nonlinear System Analysis
	References
4 Admittance Matrix Computation and Stability Analysis of Droop-Controlled DC Microgrids
	4.1 DC Microgrid System Modelling
	4.2 Admittance Matrix
	4.3 Stability of Droop Controlled Microgrids
		4.3.1 Droop Control Design
		4.3.2 Stability Analysis
	4.4 Simulation Results
	4.5 Conclusions
	References
5 Control Design and Stability Analysis  of DC Microgrids Consisting  of Unidirectional DC/DC Boost Converters
	5.1 Paralleled DC/DC Boost Converters Feeding a CIL
		5.1.1 Proposed Current-Limiting Droop Controller
		5.1.2 Simulation Results
	5.2 Paralleled DC/DC Boost Converters Feeding a CIL, CCL or a CPL
		5.2.1 Dynamic Model
		5.2.2 Proposed Controller Design
		5.2.3 Stability Analysis
		5.2.4 Methodology for Testing the Stability Conditions
		5.2.5 Simulation Results
		5.2.6 Experimental Results
	5.3 Conclusions
	References
6 Stability Analysis of Parallel-Operated Bidirectional AC/DC and DC/DC Converters
	6.1 Bidirectional DC/DC and Three-Phase AC/DC Converters Feeding a CIL
		6.1.1 Nonlinear Model of the DC Microgrid
		6.1.2 Problem Description and Objectives
		6.1.3 Nonlinear Control Design and Analysis
		6.1.4 Simulation Results
	6.2 Bidirectional DC/DC and Three-Phase AC/DC Converters Feeding a CPL
		6.2.1 Dynamic Model
		6.2.2 Nonlinear Control Design and Analysis
		6.2.3 Stability Analysis
		6.2.4 Validation of Closed-Loop System Stability
		6.2.5 Simulation Results
		6.2.6 Experimental Results
	6.3 Conclusions
	References
7 Stability Analysis of DC Microgrids Under Decentralised Primary and Distributed Secondary Control
	7.1 Dynamic Modelling of the DC Microgrid
	7.2 Proposed Controller Design
		7.2.1 Primary Control Steady-State Analysis
		7.2.2 Secondary Control Design and Analysis
	7.3 Stability Analysis
		7.3.1 Closed-Loop System
		7.3.2 Boundary Layer Stability Analysis
		7.3.3 Reduced Model
	7.4 Simulation Results
		7.4.1 Communication Failure
	7.5 Experimental Results
	7.6 Conclusions
	References
8 Droop-Controlled DC Microgrids  with Overvoltage Protection
	8.1 Parallel Configuration DC Microgrid
		8.1.1 Proposed Control Architecture
		8.1.2 Stability Analysis
		8.1.3 Simulation Results
	8.2 Meshed DC Microgrid
		8.2.1 DC Microgrid Model
		8.2.2 Proposed Control Architecture
		8.2.3 Stability Analysis
		8.2.4 Simulation Results
	8.3 Conclusions
	References
9 Conclusions
	9.1 Summary
		9.1.1 Discussions
		9.1.2 Assumptions and Limitations
	9.2 Future Work
	References
Appendix A Schematic of the Texas Instruments DC/DC Boost Converter
Appendix B Schematic of the Texas Instruments 3-Phase Inverters