臺灣博碩士論文加值系統

隨著元件的進步，以及分散式電源的興起，中壓固態變壓器成為近年來越來越熱門的研究項目。中壓固態變壓器具有多功能且高性能的特性，其中包括了整合微電網、校正功率因數、補償無效功率、隔離故障電流、調整輸出電壓以及節省重量和體積等等。本文提出之中壓固態變壓器應用於11.4 kVAC配電系統，其中直流轉換器由13具模組組成，高壓輸入端互相串聯，而低壓輸出端互相並聯。本文設計並實現了單一模組，該輸入電壓為1.52 kVDC、輸出電壓為380 VDC以及輸出功率為10 kW，其模組架構為LLC諧振式轉換器。本文旨在轉換器及中壓變壓器的分析與設計，其中電路之動作原理、穩態分析、電路元件的參數的設計以及變壓器之參數設計、絕緣考量、損耗最佳化皆會在本文中詳述。此外，本文利用軟體SIMPLIS和COMSOL Multiphysics®模擬與驗證其設計之真確性。
最後，根據本文之設計流程，研製一組輸入電壓為1.52 kVDC、輸出電壓為380 VDC以及輸出功率為10 kW之雛形電路以及一組中壓變壓器以驗證該電路之可行性。

As the progress of wide-bandgap (WBG) semiconductor devices and the rise of distributed energy resources (DER), medium-voltage solid-state transformer (SST) becomes more and more popular in recent years. Medium-voltage SST features high-performance and fantastic functionality. The SST proposed in this thesis is applied in 11.4 kVAC distribution system, and the DC stage of the SST is composed of 13 modules. Operating principle, steady-state analysis and components design of the converter as well as the parameter design, insulation consideration and loss optimization of the transformer, are described in detail in this thesis. Meanwhile, the simulation software SIMPLIS and COMSOL Multiphysics® are used to ensure the validity.
Finally, a prototype converter with input voltage 1.52 kVDC, output voltage 380 VDC and output power 10 kW is designed and realized to verify the feasibility of the module applied in SST.

摘要 i
Abstract ii
Acknowledgement iii
Contents v
List of Tables vii
List of Figures viii
Chapter 1. Introduction 1
1.1 Background and Motivation 1
1.2 Topology of Solid-State Transformer 2
1.3 Thesis Outline 9
Chapter 2. Functions and Advantages of Solid-State Transformer 10
2.1 Integration of Microgrid 10
2.2 Power Factor Correction 13
2.3 Reactive Power Support 16
2.4 Fault Isolation 18
2.5 Saving Volume and Weight 19
2.6 Voltage Regulation 20
Chapter 3. Analysis and Design of the Three-level DC-DC Converter 22
3.1 Three-level DC-DC LLC Converter 22
3.2 Operating Principle 25
3.3 Steady-state Analysis 33
3.3.1 Voltage Conversion Ratio 34
3.3.2 Choosing Operating Region 36
3.3.3 Design Consideration of the Coefficient Q and K 38
3.4 Design Consideration of the Transformer 40
3.4.1 Insulation 41
3.4.2 Core 43
3.4.3 Windings 46
Chapter 4. Parameter Design and Experimental Results 47
4.1 Choosing Materials and Parameter Design of the Transformer 47
4.1.1 Parameter Design of the Cast Resin Transformer 48
4.1.2 Choosing Insulation Materials 51
4.1.3 Design and Manufacture of Bobbin 53
4.1.4 Loss Optimization of the Transformer 56
4.2 Parameter Design of Components 63
4.2.1 Components of Resonant Tank 63
4.2.2 Semiconductor Devices 69
4.2.3 Input Capacitor 70
4.2.4 Output Capacitor 72
4.2.5 Choosing Isolated Gate Driver 74
Chapter 5. Simulation and Experimental Results 75
5.1 Simulation 75
5.1.1 Finite Element Method 75
5.1.2 Circuit Simulation 80
5.2 Experimental Equipment 84
5.3 Experimental Results 88
5.3.1 Examination of Transformer 88
5.3.2 Experimental Waveforms 92
5.3.3 Efficiency 99
Chapter 6. Conclusions and Future Works 100
6.1 Conclusions 100
6.2 Future Works 101
References 102

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