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研究生：	阮名莎 Thi, Mi Sa-Nguyen
論文名稱：	採用高壓直流輸電系統以增強含有再生能源系統之電力系統穩定度 Stability Enhancement of Power Systems With Renewable-Energy Systems Using HVDC Links
指導教授：	王醴 Wang, Li
學位類別：	博士 Doctor
系所名稱：	電機資訊學院 - 電機工程學系 Department of Electrical Engineering
論文出版年：	2013
畢業學年度：	101
語文別：	英文
論文頁數：	195
外文關鍵詞：	Stability, wind power system, marine-current power system, photovoltaic power system, high-voltage direct-current links, damping controllers
相關次數：	點閱：67 下載：0
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This dissertation studies the stability-improvement issue of power systems connected with renewable-energy systems using a high-voltage direct-current (HVDC) link based on line-commutated converter (LCC), an HVDC link based on voltage-source converter (VSC), a hybrid HVDC link based on both VSC and LCC, and a multi-terminal (MT) HVDC link based on VSCs. When the capacity of the studied renewable-energy systems such as wind power systems, marine-current power systems, and photovoltaic power systems connected to conventional power systems is increased, they can have negative impacts on stability of the connected power systems.
In order to improve the stability of the studied power systems with renewable-energy systems under different operating conditions, proportional-integral-derivative (PID) controllers, proportional-integral (PI) controllers, and adaptive neuro fuzzy inference system (ANFIS) controllers located at rectifier/inverter station of the studied four HVDC links are designed, respectively. A frequency-domain approach based on linearized system models using eigenvalue analysis and a time-domain method based on nonlinear-model simulations subject to different disturbances are systematically carried out to evaluate the effectiveness of the proposed four HVDC links joined with the designed damping controllers.
It can be concluded from the simulation results that the proposed four HVDC links joined with the designed damping controllers can effectively improve the stability of the studied power systems with renewable-energy systems under different operating conditions and various disturbance conditions.

Abstract		I
Acknowledgments	II
Contents 	III
List of figures 	VII
List of tables 	XII
Nomenclature 	XIV
Chapter 1. Introduction
1	Motivation	1
2	Literature review	5
2.1	Topics of DFIG-based OWFs	5
2.2	Topics of PMSG-based OWFs	7
2.3	Topics of SCIG-based MCFs	9
2.4	Topics of PV arrays	11
2.5	Topics of LCC-based HVDC links	13
2.6	Topics of VSC-based HVDC links	15
2.7	Topics of hybrid HVDC links	18
2.8	Topics of MT HVDC links	21
3	Contributions of the dissertation	24
4	Organization of the dissertation	25
Chapter 2. Mathematical models
1	Introduction	27
2	Model of different HVDC links	27
2.1	Model of an LCC-based HVDC link	28
2.2	Model of a VSC-based HVDC link	33
2.3	Model of a hybrid HVDC link	36
2.4	Model of an MT HVDC link	40
3	Models of offshore wind farm	44
3.1	Variable-speed wind turbine model	45
3.2	Mass-spring-damper model for OWF	46
3.3	PMSG model and its power converters	47
3.4	DFIG model and its power converters	51
4	Model of a marine-current farm	55
4.1	Model of a marine-current turbine	56
4.2	Mass-spring-damper model for MCF	57
4.3	Squirrel-cage induction generator	57
5	Model of a photovoltaic array	58
5.1	Model of a photovoltaic panel	58
5.2	Model of a photovoltaic array	60
6	Models of power system	62
6.1	Model of an OMIB system	62
6.2	Model of a multi-machine system	65
Chapter 3. Applications of an LCC-based HVDC link to power systems
1	Introduction	70
2	Comparisons of damping controllers for stability enhancement of 
	a PMSG-based OWF fed to an SG-based power system through an
	 LCC-based HVDC link	70
2.1	System configuration	71
2.2	Eigenvalue analysis	72
2.3	Design of PID damping controllers for the LCC-based HVDC link	74
2.4	Steady-state analysis	77
2.5	Time-domain simulations	79
2.6	Four PMSG-based OWFs fed to an SG-based power system 
	through an LCC-based HVDC link	81
2.7	Conclusion	86
3	Design of a PID/ANFIS damping controller for stability 
	enhancement of an OWF fed to a multi-machine system 
	through an LCC-based HVDC link	87
3.1	System configuration	88
3.2	Eigenvalue analysis	88
3.3	Design of a PID/ANFIS damping controller for an LCC-based 
	HVDC link	90
3.4	Steady-state analysis	95
3.5	Time-domain simulations	95
3.6	Conclusion	97
4	Design of a PID/ANFIS damping controller for stability 
	enhancement of OWF, MCF, and PV system fed to an SG-based 
	power system through an LCC-based HVDC link	98
4.1	System configuration	98
4.2	Eigenvalue analysis	99
4.3	Design of a PID/ANFIS damping controller for an 
	LCC-based HVDC link 	101
4.4	Time-domain simulations	104
4.5	Conclusion	107
Chapter 4. Applications of a VSC-based HVDC link to power systems
1	Introduction	108
2	Design of a PID damping controller for stability enhancement of 
	four parallel-operated DFIG-based OWFs fed to an SG-based 
	power system through a VSC-based HVDC link	108
2.1	System configuration	109
2.2	Eigenvalue analysis	110
2.3	Design of a PID damping controller for a VSC-based HVDC link	112
2.4	Steady-state analysis	113
2.5	Time-domain simulations	115
2.6	Conclusion	119
Chapter 5. Applications of a hybrid HVDC link to power systems
1	Introduction	120
2	Comparative stability analysis of two DFIG-based OWFs fed 
	to a power grid through a hybrid HVDC link, an LCC-based 
	HVDC link, and an HVAC line	120
2.1	System configuration	120
2.2	Eigenvalue analysis	122
2.3	Time-domain simulations	124
2.4	Conclusion	128
3	Design of a PID damping controller for stability enhancement 
	of two DFIG-based OWFs fed to an SG-based power system 
	through a hybrid HVDC link	128
3.1	System configuration	129
3.2	Eigenvalue analysis	130
3.3	Design of a PID damping controller for a hybrid HVDC link	132
3.4	Steady-state analysis	133
3.5	Time-domain simulations	134
3.6	Conclusion	136
Chapter 6. Applications of an MT HVDC link to power systems
1	Introduction	137
2	Design of PI damping controllers for stability enhancement of two 
	OWFs and one MCF fed to a power grid through an MT HVDC link	137
2.1	System configuration	138
2.2	Design of  PI damping controllers for stability enhancement
of two OWFs and one MCF fed to a power grid through an 
MT HVDC link	139
2.3	Steady-state analysis	141
2.4	Conclusion	142
3	Comparative stability analysis of two OWFs and one MCF fed to a 
	power grid through an MT HVDC link, a VSC-based HVDC link, 
	and an HVAC line	142 
3.1	System configuration	142
3.2	Eigenvalue analysis	144
3.3	Time-domain simulations	146
3.4	Conclusion	151
Chapter 7. Comparisons of applications of various HVDC links to power systems
1	Introduction	152
2	Design of damping controllers for stability enhancement of two 
	OWFs fed to an SG-based power system through different HVDC links	152
2.1	System configuration	153
2.2	Eigenvalue analysis	156
2.3	Design of  damping controllers for different HVDC links	162
2.4	Time-domain simulations	162
2.5	Conclusion	168
Chapter 8. Conclusions and future works
1	Conclusions	169
2	Future works	171
References	172
Appendix	189
Publications list	194
                                    

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