Programmatic Coordinating Protection Devices using Optimization Technique for System with DG Penetration

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研究生：	盧陸利 LULY - SUSILO
論文名稱：	Programmatic Coordinating Protection Devices using Optimization Technique for System with DG Penetration Programmatic Coordinating Protection Devices using Optimization Technique for System with DG Penetration
指導教授：	辜志承 Jyh-Cherng Gu
口試委員:	吳啟瑞 Chi-Jui Wu 黃培華 none 吳有基 none
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2010
畢業學年度：	98
語文別：	英文
論文頁數：	105
中文關鍵詞：	distributed generation 、PSO 、linear programming 、protection coordination
外文關鍵詞：	protection coordination, linear programming, PSO, distributed generation
相關次數：	點閱：251 下載：0
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Development of central protection unit for smart-grid protection system needs fast and accurate protection coordination. This thesis presents programmatic coordinating protection devices using optimization technique both for radial type and ring type of distribution systems. Traditionally, the relay engineer used to spend much time on calculation and trial-error the time-current graphics in order to coordinate the overcurrent relays. Many information and lots of calculations had to be done, during the process lots of setting had to be changed; changes in the settings of one relay could change others relays setting. Nowadays, the relays should respond to the changing system conditions such as new distributed generation (DG) connection to the main grid. Traditional protection relay coordination is hard to respond to this condition particularly for large network power distribution systems. Optimization technique can help to solve this coordination issue.
To reach an optimal coordination, linear programming (LP) technique and a metaheuristic algorithm called particle swarm optimizer (PSO) algorithms are introduced and implemented. Linear programming with simplex method is applied to initialize the setting parameter of overcurrent relay. PSO is applied to minimize the operating times of the relay. The objective function is to find the minimum total of operating time primary relays. The additional effect of different types of distributed generation such as synchronous DG and induction DG on fault current is also discussed; various schemes of operation mode are also covered. To test the proposed method, program based on Borland C++ 2007 and MATLAB on simple distribution network is introduced. Ultimately, the parameter settings of protection devices are generated and satisfy the constraint to reach the optimal coordination.

ABSTRACT i
ACKNOWLEDGEMENTS ii
TABLE OF CONTENTS iii
LIST OF FIGURES v
LIST OF TABLES vii
CHAPTER I Introduction 1
I.1 Scope of work 1
I.2 Related research 3
I.3 Motivation 5
I.4 Thesis objective 5
I.5 Thesis organization5
CHAPTER II Protection Issues of Distributed Generation Penetration 7
II.1 Introduction 7
II.2 Impact of Distributed Generation to protection system 7
II.2.1 Direction of power flow during normal or fault condition8
II.2.2 The loss of sensitivity for grounded DG interconnection 9
II.2.3 Effects on relay application and settings 9
II.3 Safety analysis for microgrid 13
II.4 Voltage regulation impact on distribution system with DG interconnected 14
II.5 Grid separation and islanded operation issues 14
CHAPTER III Evolutionary of Overcurrent Protection Coordination19
III.1 Introduction 19
III.2 Application of Linear Graph theory in protection coordination 20
III.2.1 Bus incidence matrix 21
III.2.2 Bus augmented incidence matrix 22
III.3 DG contribution to fault analysis27
III.3.1 Synchronous generators directly coupled to the grid 27
III.3.1.1 Synchronous generator for short-circuit studies 27
III.3.2 Induction generators directly coupled to the grid 30
III.3.2.1 Squirrel cage induction generator 31
III.3.2.2 Wound rotor induction generator 31
III.3.2.3 Induction generator for short-circuit studies31
III.3.3 Inverter based generators 34
III.4 DG sizing approach to avoid miscoordination the overcurrent protection coordination 34
III.5 Traditional protection coordination 37
III.6 Crossed condition handling of overcurrent relay characteristic curves 39
CHAPTER IV Implementation Linear Programming Algorithm and Particle Swarm      Optimizer Algorithm to Optimal Coordination Overcurrent Relays42
IV.1 Introduction 42
IV.2 Optimal coordination of overcurrent relays 42
IV.2.1 Overcurrent relay characteristic.43
IV.2.2 Constraints handling 43
IV.3 Linear programming algorithm 44
IV.3.1 Linear programming optimization toolbox MATLAB 46
IV.4 Particle Swarm Optimizer algorithm 47
IV.4.1 Tuning parameter of PSO algorithm 50
IV.4.2 PSO algorithm for constraints problem 52
IV.5 Test system example 52
IV.5.1 Initialization problem use Linear Programming algorithm 54
IV.5.1.1 Problem definition 54
IV.5.2 PSO algorithm for optimal coordination overcurrent relays 57
IV.5.3 The effect current transformer selection58
CHAPTER V Case Study 62
V.1 Introduction 62
V.2 Test case I62
V.3 Test case II 71
V.4 Test case III 75
CHAPTER VI Conclusions 84
REFERENCES 85
APPENDIX A 89
APPENDIX B 94

                                

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全文公開日期 2015/07/05 (校內網路)
全文公開日期本全文未授權公開 (校外網路)
全文公開日期本全文未授權公開 (國家圖書館：臺灣博碩士論文系統)

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