諧波衝擊是風機或風場與電網併聯時所可能導致之電力品質問題之一，其必須於風機或風場與電網併聯前加以評估。因此如何預測風速隨機變化時的風機諧波電流輸出，並進行諧波衝擊分析以瞭解風機對系統的衝擊實有其研究的必要性。本論文針對風機進行實地量測、資料整理及分析，並利用所量測之諧波資料，提出諧波電流預測器。利用所提出之諧波預測器可較精確地預測風機的諧波電流輸出，因此其對系統的隨機諧波衝擊也可以較有效地加以評估。本論文使用OpenDSS進行諧波衝擊的分析。測試結果證實本文所提出之諧波電流預測器可用以預測長時間的諧波電流輸出，且隨機諧波分析可有效地模擬風機的隨機諧波輸出對電網的衝擊。

The harmonic impact caused by wind turbines should be carefully investigated before wind turbines are interconnected. However, the harmonic currents of wind turbines are not easily predicted due to the variations in wind speed. If the harmonic current outputs can be predicted accurately, the harmonic impact of wind turbines and wind farms for distribution systems can be analyzed efficiently. Therefore, this thesis analyzes the harmonic current characteristics of wind turbines and investigates the feasibility of developing harmonic current predictors. Field measurement, data sorting, and analysis are conducted for the wind turbines. Based on the proposed harmonic current predictor, the stochastic harmonic impact analysis for distribution systems with wind turbines is investigated. OpenDSS is used for harmonic impact analysis. Test results demonstrate the validity of the proposed harmonic current predictor and stochastic harmonic impact analysis.

CONTENTS
論文審定書 ..................................................................................................................................... i
ACKNOWLEDGEMENTS ........................................................................................................... iii
摘要 ............................................................................................................................................... iv
ABSTRACT ................................................................................................................................... v
CONTENTS .................................................................................................................................. vi
LIST OF FIGURES ........................................................................................................................ ix
LIST OF TABLES ........................................................................................................................ xii
CHAPTER 1 INTRODUCTION..................................................................................................... 1
1.1 Background and Motivation ...................................................................................... 1
1. 2 Thesis Outline ........................................................................................................... 2
CHAPTER 2 DISTRIBUTED GENERATION .............................................................................. 3
2.1 Types of DG Systems ................................................................................................ 3
2.1.1 Solar PV systems ............................................................................................... 4
2.1.2 Wind Energy Conversion Systems (WECS) ..................................................... 5
2.1.3 Reciprocating Engines and Micro-turbine Generators ...................................... 9
2.1.4 Small Hydro ..................................................................................................... 12
2.2 Advantages of DG Installation ................................................................................ 12
2.3 DG Impacts on System Power Quality .................................................................... 14
2.3.1 Voltage Unbalance .......................................................................................... 15
2.3.2 Voltage Regulation .......................................................................................... 15
2.3.3 Voltage Flicker ................................................................................................ 15
2.3.4 Harmonics ........................................................................................................ 16
CHAPTER 3 INTRODUCTION TO POWER SYSTEM HARMONICS AND OpenDSS ......... 17
3.1 Harmonic Impacts on System Components ............................................................ 20
3.2 Harmonic Distortion Limits .................................................................................... 21
3.3 Open Source Distribution System Simulator (OpenDSS) ....................................... 24
3.3.1 Downloading and Registering OpenDSS to the COM Server ......................... 25
3.3.2 Designing a program in OpenDSS .................................................................. 27
3.3.3 OpenDSS Program Execution ......................................................................... 28
3.3.4 OpenDSS Harmonic Modeling ........................................................................ 29
3.4 GY22 Distribution System ...................................................................................... 33
CHAPTER 4 HARMONIC PREDICTION .................................................................................. 37
CHAPTER 5 SIMULATION RESULTS AND DISCUSSIONS ................................................. 48
5.1 Steady-State GY22 WT Harmonic Impacts Simulation .......................................... 48
5.2 Stochastic GY22 WT Harmonic Impacts Simulation ............................................. 51
CHAPTER 6 CONCLUSION ....................................................................................................... 63
REFERENCES .............................................................................................................................. 64
APPENDIX A GY22 Distribution System Parameters ................................................................. 67
APPENDIX B GY22 System Harmonic Simulation Master Code ............................................... 70

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