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

References