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研究生：	張丁明德 Truong-Dinh, Minh-Duc
論文名稱：	虛擬電容控制風電場及考慮尾流效應之的風電出力最佳化之綜合研究 Comprehensive study of wind farm with virtual capacitor control and optimal wind power production considering wake effect
指導教授：	張簡樂仁 Chang-Chien, Le-Ren
學位類別：	碩士 Master
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：	2023
畢業學年度：	111
語文別：	英文
論文頁數：	69
中文關鍵詞：	虛擬電容控制、喚醒效果、慣性控制、頻率響應、風有功功率控制
外文關鍵詞：	Virtual Capacitor Control, Wake effect, Inertial control, frequency response, wind active power control
相關次數：	點閱：78 下載：0
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Nowadays, the widespread use of renewable energy sources has introduced new challenges in power system operation. In particular, wind power plants (WPPs) aim to operate in Maximum Power Point Tracking (MPPT) mode for increased profits, but this can negatively impact frequency control capability. To address this issue, researchers focused on the methods of providing frequency regulation from WPPs. This thesis proposes a coordinated control strategy for permanent synchronous generator (PMSG)-based wind turbines (WTs) to provide both inertial and primary responses during frequency events. To provide frequency regulation, the DC-link of the Wind Energy Conversion System (WECS) can imitates inertia response using the stored DC-link energy. However, the energy from the DC-link alone is quite small compared to the power system, so the Virtual Capacitor Control (VCC) concept is employed to increase the virtual inertia of the WECS. PMSG acts as a capacitor with a vast capacitance value, Cvir, that depends on PMSG inertia. Previous research only mentioned VCC in de-loading mode when WTs can provide excess power, but this thesis explores VCC application to both de-loading mode and MPPT mode, taking rotor speed stability into consideration. The proposed control strategy also takes the wake effect into account. Simulations using MATLAB/Simulink software are exerted to verify that the WPP can also provide frequency response for frequency events as it is operating at the maximum power production.

TABLE OF CONTENTS
Chapter 1. Introduction	1
1.	Motivation	1
2.	Literature survey	4
2.1.	Topics of active power control of wind farm	4
2.2.	Topics of virtual capacitor control	6
2.3.	Topics about the wake effect in wind farm	7
3.	Contributions of the thesis	7
4.	Organization of the thesis	8
Chapter 2. Mathematical models	9
1.	Introduction	9
2.	Model of Wind Power Plants (WPPs)	10
2.1.	Model of wind turbines	10
2.2.	Model of PMSG	13
2.3.	Model of DC – link	14
3.	Model of synchronous generating unit	15
4.	The frequency response model of the power system	16
5.	Summary	18
Chapter 3. A grid-connected PMSG system control strategy	19
1.	Introduction	19
2.	Active power control of the PMSG system	20
2.1.	Maximum power point Tracking Methodology	20
2.2.	Pitch Angel Control (PAC)	21
2.3.	Rotor Speed Control	21
2.3.1.	Set-point control mode (SPC)	22
2.3.2.	Maximum Power Point Tracking Mode (MPPT)	23
3.	Active power control of VSI (DC/AC)	23
4.	Wind farm contribution to frequency control	24
4.1.	Primary frequency control – Droop control	25
4.2.	Primary frequency control – Inertia control	26
5.	Summary	27
Chapter 4. Virtual Capacitor Control and the Proposed Control Strategy	28
1.	The DC-link inertia control	28
2.	Virtual Capacitor Control (VCC)	30
3.	The Coordinate Control of PMSG-Based WT with VCC	31
4.	Virtual Capacitor Control with adaptive parameters	32
4.1.	Set-point control mode	33
4.2.	MPPT control mode	33
5.	Simulation case study	34
5.1.	WECS operates in MPPT mode	34
5.2.	WECS operates in de-loading mode	39
5.3.	Discussion about the effect of the value of Cdc and Vdc	43
6.	Summary	44
Chapter 5. The Wake Effect in Wind Farm and Maximize Control Strategy	46
1.	The Jensen model of the Wake Effect	46
1.1.	Single wake model	46
1.1.1.	The Jensen wake model	46
1.1.2.	Jensen’s partial wake model	49
1.2.	Multiple Jensen wake model	50
1.3.	Rotate axes equation	52
2.	Maximize total power in wind farm when considering the wake effect	53
2.1.	Evaluate the impact of each parameter	53
2.2.	Maximize total power considering available reserve power	55
2.2.1.	N wind turbine in a row	55
2.2.2.	Maximum power of wind farm with Changhwa case layout	59
3.	Summary	60
Chapter 6. Simulation Results and Discussion	61
Chapter 7. Conclusions and future works	64
1.	Conclusions	64
2.	Future works	64
References	66

Chapter 1. Introduction	1
1.	Motivation	1
2.	Literature survey	4
3.	Contributions of the thesis	7
4.	Organization of the thesis	8
Chapter 2. Mathematical models	9
1.	Introduction	9
2.	Model of Wind Power Plants (WPPs)	10
3.	Model of synchronous generating unit	15
4.	The frequency response model of the power system	16
5.	Summary	18
Chapter 3. A grid-connected PMSG system control strategy	19
1.	Introduction	19
2.	Active power control of the PMSG system	20
3.	Active power control of VSI (DC/AC)	23
4.	Wind farm contribution to frequency control	24
5.	Summary	27
Chapter 4. Virtual Capacitor Control and the Proposed Control Strategy	28
1.	The DC-link inertia control	28
2.	Virtual Capacitor Control (VCC)	30
3.	The Coordinate Control of PMSG-Based WT with VCC	31
4.	Virtual Capacitor Control with adaptive parameters	32
5.	Simulation case study	34
6.	Summary	44
Chapter 5. The Wake Effect in Wind Farm and Maximize Control Strategy	46
1.	The Jensen model of the Wake Effect	46
2.	Maximize total power in wind farm when considering the wake effect	53
3.	Summary	60
Chapter 6. Simulation Results and Discussion	61
Chapter 7. Conclusions and future works	64
1.	Conclusions	64
2.	Future works	64
                                    

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校內：2028-02-02公開
校外：2028-02-02公開電子論文尚未授權公開，紙本請查館藏目錄

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