MODELING AND SIMULATION OF A MULTi-PORT MVDC CONVERTER FOR TIDAL POWER GENERATION SYSTEMS

摘要

潮汐能是一种可预测的可再生能源，潮汐电站并入直流电网的方案对于全水下的功率变换系统更具优势。本研究的主要目的是提出一种适用于潮汐发电系统的多端口DC-DC转换器，该系统用于收集多端口潮汐驱动功率，并将收集到的电能转换并传输到30kV直流配电网络中去。
　　文献综述回顾了用于汇流的多端口DC-DC转换器和直流微电网的技术发展状况，提出了一种适用于潮汐发电系统的多端口功率变换器。低速潮汐发电机的输出经过整流后将直流电通过短距离直流海缆送至直流汇流站，所提出的汇流站中的变换器由多个电流源逆变器(CSI)，500Hz变压器和一个7电平输入模块化多电平转换器(MMC)组成;本文分别提出了移相式和脉宽调制式的能量传输调制方法，在多输入直流端口和中压直流母线之间传递能量，仿真证明提出的拓扑和移相能量传输方法可以高效汇流多发电机功率，可以成为水下潮汐发电的可选方案之一。

目录

ABSTRACT

摘要

TABLE OF FIGURES

ABBREVIATIONS

TABLE OF CONTENTS

CHAPTER 1 INTRODUCTION

1．1 BACKGROUND ON ELECTRICITY POWER SYSTEMS AND RENEWABLE ENERGY RESOURCES

1．2 TIDAL BASED RENEWABLE ENERGY DEVELOPMENT

1．3 DC DISTRIBUTION GRIDS

1．4 STATE OF THE ART OF DC-DC CONVERTERS FOR DC GRIDS

1．5 THESIS ORGANIZATION

CHAPTER 2 TIDAL POWER SYSTEMS

2．1 TIDAL POWER SYSTEM

2．2 PROPOSED TIDAL POWER SYSTEM AND ITS COMPONENTS

2．3 POWER GENERATION FROM TIDES

2．4 TURBINE-PMSG SIMULATION RESULTS

2．5 MODELING OF DC TRANSMISSION LINES

2．6 TRANSFORMER DESIGN

CHAPTER 3 POWER TRANSFER AND CONTROL

3．1 POWER TRANSFER CONVERTER MODELS

3．2 PROPOSED DC-DC MULTI PORT CONVERTER

3．3 OPERATION PRINCIPLES OF THE MMC

3．4 MMC SIMULATION RESULTS

3．5 SIMULATION OF THE PRPOSED PHASE SHIFITING METHOD (SINGLE TURBINE CASE)

3．6 SIMULATION OF THE PROPOSED PHASE SHIFITING METHOD (MULTI TURBINE CASE)

3．7 SIMULATION OF THE PROPOSED DUTY CYCLE VARIATION METHOD (SINGLE TURBINE CASE)

3．8 SIMULATION OF THE PRPOSED DUTY CYCLE VARIATION METHOD (MULTI TURBINE CASE)

3．9 RESULTS AND ANALYSIS

CHAPTER 4 CONCLUSION AND FUTURE WORK

4．2 FUTURE WORKS

REFERENCES

ACKNOWLEDGEMENT

声明