臺灣博碩士論文加值系統

在本論文中，我們利用錯誤診斷濾波器設計一電壓崩潰的偵測方法。同時為了更進一步提升電力系統之電壓品質，我們利用可變結構控制法則設計一電壓調節器用以達到電壓調節的目的。此外，我們亦設計一負載估測器用以估測電力系統之負載變動，且在設計電壓調節器時，亦把負載的變動考慮進去，使我們所設計之電壓調節器有更好的調節能力。最後，我們把偵測電壓崩潰的機制引入我們所設計之電
壓調節系統，提供電力系統一個安全、穩定且可靠的操作環境。

In this thesis, we present a means of the detection of voltage collapse in a power system based on the linear-based fault identification filter (FIDF) design technique. Moreover, in order to promote the voltage quality of power supply for secure operation of a power system. We employ Variable Structure Control technique to design the voltage regulator of a power system. In addition, a load estimator is proposed to provide the accurate load variation to the VSC voltage regulator to have better regulating capacity. Finally, we combine the prior designs to maintain a
secure and reliable operation of the power system.

CHINESE ABSTRACT I
ABSTRACT II
ACKNOWLEDGEMENT III
TABLE OF CONTENTS IV
LIST OF FIGURES VI
1. INTRODUCTION 1
1.1. Motivation 1
1.2. Outline 4
2. PRELIMINARIES 5
2.1. Fault Identification Filter(FIDF) 5
2.2. Short-Time Fourier Transform 8
2.2.1. Window function 8
2.2.2. Short-time Fourier transform 10
2.2.3. Time-Frequency Window 11
2.3. Variable Structure Control 12
2.3.1. Sliding Surface 12
2.3.2. Variable Structure Control Design 17
2.4. Adaptive Control 20
3. DETECTION OF VOLTAGE COLLAPSE FOR THE ELECTRIC POWER SYSTEMS 25
3.1. Dynamical Equations of Electric Power Systems 25
3.2. Voltage Collapse in the Electric Power Systems 30
3.3. Results of FIDF Design 31
3.4. Results of Signal Analysis 37
4. VOLTAGE REGULATION OF THE ELECTRIC POWER SYSTEMS 41
4.1. Variable Structure Controller Design 41
4.1.1. Controlled Power System Model 41
4.1.2. Controller Design 44
4.1.3. Simulation Results 48
4.2. Parameter Estimator Design 54
4.2.1. The Gradient Method 54
4.2.1.1. Linear Parametrization Model 54
4.2.1.2. Predication-Error-Based Estimation Methods 55
4.2.1.3. The Gradient Estimator 56
4.2.1.4. Application To Power Systems 57
4.2.2. An Observer Approach 61
4.2.2.1. The Transformation of Decoupled Form 61
4.2.2.2. Observer Design for Constant Parameters 62
4.2.2.3. Observer Design for Time-Varying Parameters 64
4.2.2.4. Application to Power Systems 66
4.3. Adaptive Control System Design 76
4.3.1. Control System Design 76
4.3.2. Application to Power Systems 77
5. CONTROL OF VOLTAGE COLLAPSE 82
5.1. Control of Voltage Collapse 83
5.2. Simulation Results 85
6. CONCLUSIONS AND SUGGESTIONS FOR FURTHER RESEARCH 88
REFERENCES 90

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