臺灣博碩士論文加值系統

本論文在IEEE第二標準模型第一系統基礎上提出在串聯補償之傳輸線路中再串聯一個靜態同步串聯補償器來抑制發電廠機械轉軸可能發生的次同步共振現象。整個系統模型在三相平衡條件下建立至d-q同步參考軸,爲了獲取靜態同步串聯補償器在阻止次同步現象之更好效果，本文利用模態控制理論之極點安置法設計一個參數恰當的輔助阻尼控制器。在穩態分析中，不同工作條件下對比不採用靜態同步串聯補償器之系統與採用靜態同步串聯補償器及其輔助控制器之系統特徵值，本論文所提出的靜態同步串聯補償器在抑制次同步共振方面確有成效。進一步在動態分析中，同樣對比這兩種系統，模擬結果證實所提出的靜態同步串聯補償器架構確有功效，因為次同步共振現象之動態波形非常密集，文中利用快速傅立葉變換把時域數據轉到頻域，各次同步頻率即被驗證。最後，文中還對系統做了不同工作條件下的動態模擬，來進一步測試所提出的設計。

This thesis presents the damping of subsynchronous resonance (SSR) of the IEEE Second Benchmark Model, System #1 using a static synchronous series compensator (SSSC). The integrated system mathematical model is expressed in d-q reference frame under three-phase balanced condition. To achieve better damping performance on damping SSR of the studied system, a proper oscillation damping controller (ODC) is designed by using pole-assignment approach based on modal control theory. Steady-state analysis under different operating conditions is performed to verify the effectiveness of the SSSC joined with the designed ODC using eigenvalue analysis. Comparative time-domain simulations between the system without and with the proposed SSSC joined with the ODC reveals that the proposed SSSC with the designed ODC can suppress SSR of the studied system effectively. It can be concluded from the simulation results that the proposed SSSC coordinated with the designed ODC can significantly damp SSR under various operating conditions.

CONTENTS
Page
ABSTACT I
ACKNOWLEDGMENTS III
CONTENTS IV
LIST OF FIGURES VII
LIST OF TABLES XII
NOMENCLATURE XIV
CHAPTER 1 INTRODUCTION 1
1.1 Motivation of this thesis 1
1.2 Literature review 3
1.3 Contribution of this thesis 6
1.4 Organization of this thesis 7
CHAPTER 2 SYSTEM MODELS 9
2.1 Introduction 9
2.2 Equivalent mass-spring-damper model 10
2.3 Synchronous generator model 14
2.4 Synchronous generator connecting to infinite bus 16
2.5 IEEE type-1 excitation system model 18
2.6 Turbine torque and governor system 19
2.7 SSSC model 21
2.8 Summary of the integrated system model 24
CHAPTER 3 OSCILLATION DAMPING CONTROLLER
DESIGN BY APPLYING MODAL CONTROL THEORY 26
3.1 Introduction 26
3.2 Modal decomposition 26
3.3 Open-loop system analysis 28
3.4 Design an oscillation damping controller (ODC) for SSSC 34
3.5 Sensitivity of the ODC parameters 39
CHAPTER 4 STEADY-STATE ANALYSIS 42
4.1 Introduction 42
4.2 Analysis of varying operating conditions without SSSC 42
4.3 Analysis of varying operating conditions with SSSC ＆ ODC 49
4.3.1 Analysis under different values of Vt 49
4.3.2 Analysis under different values of PG 52
4.3.3 Analysis under different values of PF 54
4.4 Summary 57
CHAPTER 5 TIME-DOMAIN SIMULATIONS 58
5.1 A 10% step torque disturbance test 59
5.2 A 10% voltage disturbance test 74
5.3 Three-phase short-circuit fault test 84
5.4 Stability test under non-nominal operating condition 99
5.5 System response when one of the transmission lines tripped 107
CHAPTER 6 CONCLUSION AND FUTURE WORKS 113
REFERENCES 115
APPENDIX 119

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