清洁与可再生能源研究：风能

5.2 Future Work

5.1 Summary

5 Summary and Future Work

4.3 Conclusion

4.2 The Influence of the Swept Angle of Blade

4.1 The Influence of the Solidity

4 Parametric Study

3.4 Conclusion

3.3 Validation of the 3D Code

3.2 Validation of the 2D Code

3.1 Description of the Experiment

3 Model Validation

2.2 Description of the 3D Code-GENUVP

2.1 Description of 2D Code

2 Description of the Tools

1.4 The Structure of the Thesis

1.3 Literature Review

1.2 The Basics of Vertical Axis Wind Turbine

1.1 The Significance of Wind Energy

1 Introduction

Abstract

8 Aerodynamic Study of Vertical Axis Wind Turbines （VAWT）Using Free Wake Models

References

Appendix

5 Summary

4.4 Optimization Process on Battery Capacity of PV and Wind Grid-connected Power System

4.3 Matlab GA Toolbox

4.2 Genetic Algorithm

4.1 Introduction

4 The Optimal Configuration of Energy Storage Devices

3.4 Mathematical Model of BES

3.3 The Mathematical Model and Control System of SMES

3.2 The Effect of Energy Storage Devices

3.1 Introduction

3 The Effect of Energy Storage System on Grid-connected PV and Wind Power System

2.5 The Comparison of Different Energy Storage Devices

2.4 SCESS （Super Capacitor Energy Storage System）

2.3 FESS （Flywheel Energy Storage System）

2.2 BESS （Battery Energy Storage System）

2.1 SMESS （Superconducting Magnetic Energy Storage System）

2 The Application Status of Energy Storage Device

1.4 Main Work

1.3 Study Status of Optimization Configuration of Energy Storage System Capacity

1.2 Study Status of Energy Storage Device

1.1 Research Background

1 Introduction

Abstract

7 Application Status and Simulation Studies of Energy Storage Devices in Grid-connected PV and Wind Power Plants

References

6.2 Future Work

6.1 Summary

6 Summary and Future Work

5.4 Conclusion

5.3 Simulation Results

5.2 Input Parameters for the Structural Model

5.1 Description of the Structural Model

5 Elastically Mounted Airfoil Simulation

4.3 Conclusion

4.2 Simulation Results and Analysis

4.1 Definition of the Motion

4 Imposed Motion Simulation

3.4 Conclusion

3.3 FFT Analysis of the Load Coefficients Time Series

3.2 Simulation Results for Cut-off Function Ⅱ

3.1 Simulation Results for Cut-off Function Ⅰ

3 Steady State Prediction

2.6 Conclusion

2.5 The Near Wake Segment Limitation

2.4 The Minimum Distance Between Point Vortex and Airfoil Surface

2.3 Separation Point Position

2.2 Time Step

2.1 The Number of Panels

2 Parametric Study of the Code

1.3 Description of the Free Wake Code

1.2 Method and Goal of This Study

1.1 Vortex-induced Vibration （VIV）

1 Introduction

Abstract

6 Investigation of Vortex-induced Vibrations Using a Free Wake Code

References

6 Conclusion

5.2 Fault Generator

5.1 DFIG

5 Case Study

4.2 Effect of Fault and Recovery Time

4.1 Simulation

4 Simulation Study

3 An Improved Current Control Strategy

2.4 The Analysis of Suitable Rotor Current Reference

2.3 The Reported LVRT Control Strategies

2.2 Simulation on Transient Analysis

2.1 Transient Analysis with Crowbar Protection

2 Transient Analysis and LVRT Strategies of DFIG

1.2 Mathematical Model

1.1 LVRT and DFIG

1 Introduction

Acronyms and Abbreviations

Notation

Abstract

5 An Improved Control Strategy of Doubly-fed Wind Turbine under Voltage Dips Based on Lenz Law

References

5.2 Prospect

5.1 Summary

5 Summary and Prospect

4.3 Results and Discussion

4.2 CFD Method

4.1 Three Designed Airfoils and Grids

4 Numerical Simulation for Three Designed Airfoils

3.3 Results，Comparison and Discussion

3.2 Method and Conditions

3.1 Airfoil and Grid

3 Validation

2.2 Steps

2.1 Method

2 Airfoil Design

1.3 Research Topic

1.2 Research Infrastructure

1.1 Wind Energy

1 Introduction

Abstract

4 Analysis of the Aerodynamic Behavior of Non-Conventional Airfoil Shapes Using Computational Fluid Dynamics （CFD）

参考文献

7.2 展望

7.1 总结

7 总结与展望

6.4 本章小结

6.3 模拟结果及分析

6.2 气弹耦合模拟

6.1 弹性模型

6 弹性支撑翼型模拟

5.4 本章小结

5.3 “锁定现象”与涡致振动

5.2 模拟结果分析

5.1 弦向振动以及部分参数的定义

5 翼型受迫振动模拟

4.4 本章小结

4.3 气动力系数的FFT分析

4.2 切断函数Ⅱ的模拟结果

4.1 切断函数Ⅰ的模拟结果

4 翼型空气动力性能预测

3.6 本章小结

3.5 近尾流面元的限制

3.4 尾流中点涡与翼型表面的最小距离

3.3 分离点位置

3.2 时间步长

3.1 翼型面元数

3 模型参数研究

2.4 切断函数

2.3 数值模型

2.2 数学模型

2.1 模型简介

2 双尾流模型

1.4 本文研究方法及主要内容

1.3 涡致振动研究进展

1.2 涡致振动现象简介

1.1 研究背景

1 绪论

摘要

3 停摆风力机叶片涡致振动数值分析

参考文献

5.2 展望

5.1 总结

5 总结与展望

4.4 本章小结

4.3 低电压穿越实验

4.2 故障跌落装置实验

4.1 实验平台简介

4 实验验证

3.5 本章小结

3.4 故障及恢复时刻的影响

3.3 反向电流跟踪控制策略仿真分析

3.2 反向电流跟踪控制策略

3.1 LVRT转子电流需求分析

3 改进型反向电流跟踪控制策略

2.4 本章小结

2.3 端口等效阻抗分析

2.2 暂态分析方法

2.1 双馈感应电机数学模型

2 DFIG的暂态过程及端口等效阻抗分析

1.3 主要研究内容

1.2 双馈风力发电机低电压穿越技术研究现状

1.1 风力发电概况

1 绪论

摘要

2 双馈风机低电压穿越励磁控制技术研究

参考文献

6.2 展望

6.1 结论

6 结论和展望

5.4 本章小结

5.3 结果和讨论

5.2 CFD方法

5.1 三个设计翼型和网格划分

5 设计翼型的数值模拟

4.4 本章小结

4.3 结果、对比和讨论

4.2 验证方法和初始条件

4.1 翼型和网格

4 程序验证

3.3 本章小结

3.2 设计步骤

3.1 设计方法

3 翼型设计

2.5 本章小结

2.4 AIRFsst程序介绍

2.3 CFD理论

2.2 XFOIL程序介绍

2.1 翼型设计理论

2 理论与工具

1.4 本章小结

1.3 研究背景

1.2 研究范畴

1.1 研究意义

1 绪论

摘要

1 非常规风力机叶片翼型的气动性能研究与CFD仿真

Preface

前言

版权信息

封面

封面

版权信息

前言

Preface

1 非常规风力机叶片翼型的气动性能研究与CFD仿真

摘要

1 绪论

1.1 研究意义

1.2 研究范畴

1.3 研究背景

1.4 本章小结

2 理论与工具

2.1 翼型设计理论

2.2 XFOIL程序介绍

2.3 CFD理论

2.4 AIRFsst程序介绍

2.5 本章小结

3 翼型设计

3.1 设计方法

3.2 设计步骤

3.3 本章小结

4 程序验证

4.1 翼型和网格

4.2 验证方法和初始条件

4.3 结果、对比和讨论

4.4 本章小结

5 设计翼型的数值模拟

5.1 三个设计翼型和网格划分

5.2 CFD方法

5.3 结果和讨论

5.4 本章小结

6 结论和展望

6.1 结论

6.2 展望

参考文献

2 双馈风机低电压穿越励磁控制技术研究

摘要

1 绪论

1.1 风力发电概况

1.2 双馈风力发电机低电压穿越技术研究现状

1.3 主要研究内容

2 DFIG的暂态过程及端口等效阻抗分析

2.1 双馈感应电机数学模型

2.2 暂态分析方法

2.3 端口等效阻抗分析

2.4 本章小结

3 改进型反向电流跟踪控制策略

3.1 LVRT转子电流需求分析

3.2 反向电流跟踪控制策略

3.3 反向电流跟踪控制策略仿真分析

3.4 故障及恢复时刻的影响

3.5 本章小结

4 实验验证

4.1 实验平台简介

4.2 故障跌落装置实验

4.3 低电压穿越实验

4.4 本章小结

5 总结与展望

5.1 总结

5.2 展望

参考文献

3 停摆风力机叶片涡致振动数值分析

摘要

1 绪论

1.1 研究背景

1.2 涡致振动现象简介

1.3 涡致振动研究进展

1.4 本文研究方法及主要内容

2 双尾流模型

2.1 模型简介

2.2 数学模型

2.3 数值模型

2.4 切断函数

3 模型参数研究

3.1 翼型面元数

3.2 时间步长

3.3 分离点位置

3.4 尾流中点涡与翼型表面的最小距离

3.5 近尾流面元的限制

3.6 本章小结

4 翼型空气动力性能预测

4.1 切断函数Ⅰ的模拟结果

4.2 切断函数Ⅱ的模拟结果

4.3 气动力系数的FFT分析

4.4 本章小结

5 翼型受迫振动模拟

5.1 弦向振动以及部分参数的定义

5.2 模拟结果分析

5.3 “锁定现象”与涡致振动

5.4 本章小结

6 弹性支撑翼型模拟

6.1 弹性模型

6.2 气弹耦合模拟

6.3 模拟结果及分析

6.4 本章小结

7 总结与展望

7.1 总结

7.2 展望

参考文献

4 Analysis of the Aerodynamic Behavior of Non-Conventional Airfoil Shapes Using Computational Fluid Dynamics （CFD）

Abstract

1 Introduction

1.1 Wind Energy

1.2 Research Infrastructure

1.3 Research Topic

2 Airfoil Design

2.1 Method

2.2 Steps

3 Validation

3.1 Airfoil and Grid

3.2 Method and Conditions

3.3 Results，Comparison and Discussion

4 Numerical Simulation for Three Designed Airfoils

4.1 Three Designed Airfoils and Grids

4.2 CFD Method

4.3 Results and Discussion

5 Summary and Prospect

5.1 Summary

5.2 Prospect

References

5 An Improved Control Strategy of Doubly-fed Wind Turbine under Voltage Dips Based on Lenz Law

Abstract

Notation

Acronyms and Abbreviations

1 Introduction

1.1 LVRT and DFIG

1.2 Mathematical Model

2 Transient Analysis and LVRT Strategies of DFIG

2.1 Transient Analysis with Crowbar Protection

2.2 Simulation on Transient Analysis

2.3 The Reported LVRT Control Strategies

2.4 The Analysis of Suitable Rotor Current Reference

3 An Improved Current Control Strategy

4 Simulation Study

4.1 Simulation

4.2 Effect of Fault and Recovery Time

5 Case Study

5.1 DFIG

5.2 Fault Generator

6 Conclusion

References

6 Investigation of Vortex-induced Vibrations Using a Free Wake Code

Abstract

1 Introduction

1.1 Vortex-induced Vibration （VIV）

1.2 Method and Goal of This Study

1.3 Description of the Free Wake Code

2 Parametric Study of the Code

2.1 The Number of Panels

2.2 Time Step

2.3 Separation Point Position

2.4 The Minimum Distance Between Point Vortex and Airfoil Surface

2.5 The Near Wake Segment Limitation

2.6 Conclusion

3 Steady State Prediction

3.1 Simulation Results for Cut-off Function Ⅰ

3.2 Simulation Results for Cut-off Function Ⅱ

3.3 FFT Analysis of the Load Coefficients Time Series

3.4 Conclusion

4 Imposed Motion Simulation

4.1 Definition of the Motion

4.2 Simulation Results and Analysis

4.3 Conclusion

5 Elastically Mounted Airfoil Simulation

5.1 Description of the Structural Model

5.2 Input Parameters for the Structural Model

5.3 Simulation Results

5.4 Conclusion

6 Summary and Future Work

6.1 Summary

6.2 Future Work

References

7 Application Status and Simulation Studies of Energy Storage Devices in Grid-connected PV and Wind Power Plants

Abstract

1 Introduction

1.1 Research Background

1.2 Study Status of Energy Storage Device

1.3 Study Status of Optimization Configuration of Energy Storage System Capacity

1.4 Main Work

2 The Application Status of Energy Storage Device

2.1 SMESS （Superconducting Magnetic Energy Storage System）

2.2 BESS （Battery Energy Storage System）

2.3 FESS （Flywheel Energy Storage System）

2.4 SCESS （Super Capacitor Energy Storage System）

2.5 The Comparison of Different Energy Storage Devices

3 The Effect of Energy Storage System on Grid-connected PV and Wind Power System

3.1 Introduction

3.2 The Effect of Energy Storage Devices

3.3 The Mathematical Model and Control System of SMES

3.4 Mathematical Model of BES

4 The Optimal Configuration of Energy Storage Devices

4.1 Introduction

4.2 Genetic Algorithm

4.3 Matlab GA Toolbox

4.4 Optimization Process on Battery Capacity of PV and Wind Grid-connected Power System

5 Summary

Appendix

References

8 Aerodynamic Study of Vertical Axis Wind Turbines （VAWT）Using Free Wake Models

Abstract

1 Introduction

1.1 The Significance of Wind Energy

1.2 The Basics of Vertical Axis Wind Turbine

1.3 Literature Review

1.4 The Structure of the Thesis

2 Description of the Tools

2.1 Description of 2D Code

2.2 Description of the 3D Code-GENUVP

3 Model Validation

3.1 Description of the Experiment

3.2 Validation of the 2D Code

3.3 Validation of the 3D Code

3.4 Conclusion

4 Parametric Study

4.1 The Influence of the Solidity

4.2 The Influence of the Swept Angle of Blade

4.3 Conclusion

5 Summary and Future Work

5.1 Summary

5.2 Future Work