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研究生：	陳翔雄 Chen, Shiang-Shong
論文名稱：	利用超導儲能系統於大型離岸式風場之動態穩定度改善研究 Dynamic-Stability Improvement of a Large-Scale Offshore Wind Farm Using a Superconducting Magnetic Energy Storage Unit
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：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	86
中文關鍵詞：	感應發電機、洋流場、風場、超導儲能系統、模態控制理論、特徵值、非線性模擬
外文關鍵詞：	nonlinear model simulations., eigenvalue, wind farm (WF), induction generator (IG), marine-current farm (MCF), modal control theory, superconducting magnetic energy storage (SMES)
相關次數：	點閱：119 下載：2
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本論文提出一個超導儲能系統控制架構連接於市電併聯型離岸式風場，達到功率潮流控制及改善系統阻尼控制。在本論文中，由40部2 MW之感應發電機組合而成一個等效80 MW的離岸式風場，另外由30部2 MW的感應發電機合併而成一個等效60 MW的洋流場，分別提供本論文做為單一風場以及混合風場及洋流場的研究模型使用。本論文所提出之阻尼控制器是將超導儲能系統連接等效風場或連接混合風場及洋流場後，利用模態控制理論進行設計。在頻域分析下，本論文基於線性化模型使用特徵值技巧進行分析，而時域分析則採用非線性模型加入干擾動觀察所設計控制器的效能。由模擬的結果可以發現本論文所設計的超導儲能系統阻尼控制器，於變動風速及變動洋流速度下都可穩定工作，當系統加入不同的干擾分析時所採用的超導儲能系統阻尼控制器亦可有效控制系統變動特性。由單一風場及混合風場及洋流場注入電網之既有實功及虛功擾動亦可經由所提出的控制策略獲得有效改善。

This dissertation presents a control scheme based on a superconducting magnetic energy storage (SMES) unit to achieve both power flow control and damping improvement of a large-scale offshore wind farm connected to a large power grid. The performance of the studied wind farm (WF) is simulated by an equivalent 80-MW induction generator (IG) consisting of forty 2-MW IGs while an equivalent 60-MW IG consisting of thirty 2-MW IGs is employed to study the characteristics of the marine-current farm (MCF). A damping controller for the SMES unit is designed by using modal control theory to contribute effective damping characteristics to the studied WF and the combined WF and MCF under different operating conditions. A frequency-domain approach based on a linearized system model using eigenvalue techniques to designed a damping controller. A time-domain scheme based on a nonlinear system model subject to disturbance conditions are both employed to validate the effectiveness of the proposed control scheme. It can be concluded from the simulated results that the proposed SMES unit combined with the designed damping controller is very effective to stabilize the studied WF and the combined WF and MCF under various operating conditions. The inherent fluctuations of the injected active power and reactive power of the WF and the combined WF and MCF to the power grid can also be effectively controlled by the proposed control scheme.

Contents
摘要.............................................................................. I
Abstract.......................................................................... II
Acknowledgment ................................................................... III
Contents……...................................................................... IV
List of figures .................................................................. VII
List of tables ................................................................... IX
Symbols and abbreviations......................................................... X
Chapter 1 Introduction............................................................ 1
1.1 Motivation ................................................................... 1
1.2 Literature survey............................................................. 3
1.2.1 SMES units applied to wind power generation systems ........................ 3
1.2.2 Technologies for SMES units implementation.................................. 3
1.2.3 SMES units applied to power flow control and modeling ...................... 4
1.2.4 Damping controller design of SMES units applied to
      transient-stability improvement............................................. 4
1.2.5 SMES units applied to multi-machine power systems........................... 5
1.2.6 Studies of combined ocean energy and wind energy ........................... 6
1.3 Contributions of this dissertation............................................ 6
1.4 Organization of the dissertation.............................................. 8

Chapter 2 Mathematical models..................................................... 9
2.1 Introduction ................................................................. 9
2.2 Wind-speed model.............................................................. 11
2.3 Wind-turbine model............................................................ 12
2.4 Mass-spring-damper model of wind-turbine ..................................... 13
2.5 Induction generator model..................................................... 14
2.6 Models for excitation capacitor bank, transmission lines, and local
    load ......................................................................... 14
2.7 Marine-current speed model.................................................... 15
2.8 Marine-current-turbine model ................................................. 16
2.9 SMES model.................................................................... 17
2.10 Summary...................................................................... 20

Chapter 3 A PID damping controller for the SMES unit
          tosuppress tie-line active-power fluctuations of a
          large-scale offshore wind farm ......................................... 21
3.1 Introduction ................................................................. 21
3.2 Linearized system............................................................. 22
3.3 Design of a PID SMES damping controller ...................................... 24
3.4 Summary....................................................................... 28

Chapter 4 Steady-state analysis of a large-scale offshore wind
          farm under various wind speeds.......................................... 29
4.1 Introduction ................................................................. 29
4.2 Power flow control ........................................................... 30
4.3 Analysis of closed-loop system eigenvalues under various
    windspeeds ................................................................... 32
4.4 Summary....................................................................... 34

Chapter 5 Transient simulations of a large-scale offshore wind
          farm under disturbance conditions ...................................... 35
5.1 Introduction ................................................................. 35
5.2 Three-phase short-circuit fault............................................... 36
5.3 Gust-wind speed disturbance................................................... 37
5.4 Noise-wind speed disturbance.................................................. 37
5.5 Summary....................................................................... 44

Chapter 6 A PID damping controller for a SMES unit
          tosuppress tie-line active-power fluctuations of a
          hybrid wind and marine-current farm .................................... 45
6.1 Introduction ................................................................. 45
6.2 Linearized system............................................................. 47
6.3 Design of a PID SMES damping controller ...................................... 49
6.4 Summary....................................................................... 53

Chapter 7 Steady-state analysis of a hybrid wind and
          marine-current farm under various operating
          conditions ............................................................. 54
7.1 Introduction ................................................................. 54
7.2 Power flow control ........................................................... 56
7.3 Analysis of system eigenvalues under various wind speeds and
    various marine-current speeds ................................................ 60
7.4 Summary....................................................................... 61

Chapter 8 Dynamic simulations of a hybrid wind and
          marine-current farm under disturbance conditions ....................... 62
8.1 Introduction ................................................................. 62
8.2 Torque disturbance ........................................................... 63
8.3 Gust-wind disturbance......................................................... 63
8.4 Disturbance of suddenly-changed local load.................................... 64
8.5 Summary....................................................................... 71
Chapter 9 Conclusions and further research directions ............................ 72
References........................................................................ 75
Appendix: Employed parameters .................................................... 80
Biography ........................................................................ 82
                                    

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校內：2012-06-22公開
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