臺灣博碩士論文加值系統

本論文提出一具可抑制太陽能模組電流漣波之前饋控制的升壓式直流電能轉換器。60Hz單相SPWM變頻器將直流側電壓轉換成交流電壓輸出，其所反饋至直流端的120Hz脈衝電流會造成太陽能模組的輸出電流與電壓漣波，造成太陽能模組內阻功耗，減短太陽能模組壽命。為了抑制此由變頻器反饋的漣波電流，一般需採用大電解電容來濾波。而本論文電路採用前饋機制來抑制變頻器的反饋電流，以降低太陽能模組內阻功耗。
此外，本論文所提電路的直流升壓轉換比，可將太陽能模組端直流電壓升壓，提高後級變頻器的調變係數(Modulation Index)，以便使用低壓太陽能模組。
最後，將實作一具85W雛型電路，進行系統總成測試，驗證本論文電路分別以戴維寧等效電路電源及太陽能模組電源供電下，於不同脈衝電流負載時，電源端可抑制電流漣波與電壓漣波的能力。

This thesis presents a boost-type DC-DC converter with feed-forward control mechanism to suppress the current ripple of PV modules. The AC output voltage is converted from the DC-link voltage by a 60Hz single-phase inverter. The 120Hz pulsating-current load at DC-side causes the PV current and voltage ripples, which lead to the power losses and reduce the lifetime of PV modules. In general, bulky capacitors are employed to suppress the PV current ripple. This thesis proposes a feed-forward control mechanism to suppress the PV current ripple for less internal power loss on PV modules.
Furthermore, the step-up voltage conversion ratio of the proposed boost-type DC-DC converter provides a high modulation index for the 60Hz single-phase inverter.
Finally, an 85W prototype circuit of the proposed boost-type DC-DC converter is designed and implemented to verify the suppression capability on the PV current and voltage ripples with a Thevenin-type and a PV emulator source, respectively.

CHAPTER 1 INTRODUCTION 1
1.1. Background 1
1.2. Motivation 8
1.3. Thesis Outline 9
CHAPTER 2 PROPOSED 5-PARAMETER APPROACH FOR I-V CURVES OF PV MODULES 10
2.1. Introduction 10
2.2. Characterizations of PV Modules 11
2.3. Proposed 5-Parameter Method 13
2.4. Verification of Characterized PV I-V Curves 16
2.5. Power Loss Calculation of PV Modules 21
2.6. Summary 24
CHAPTER 3 PROPOSED BOOST-TYPE DC-DC CONVERTER 25
3.1. Introduction 25
3.2. Operational Principle 25
3.2.1. Inductor Current 28
3.2.2. Voltage Conversion Ratio 29
3.2.3. DC-link Capacitor Voltage 30
3.2.4. Optimal Design of Charge-pump Capacitance 31
3.3. Open-loop System Analysis 32
3.3.1. PV Voltage-to-BUS Voltage 33
3.3.2. Control-to-BUS Voltage 35
3.3.3. Inverter Current-to-PV Current 39
3.4. Closed-loop System Analysis 45
3.4.1. Compensator Design 47
3.4.2. PV Voltage-to-BUS Voltage Transfer Function 50
3.4.3. Inverter Current-to PV Current 51
3.5. Feedforward Control System Analysis 53
3.5.1. PV Voltage-to-BUS Voltage 53
3.5.2 Inverter Current-to-PV Current 55
3.6. Summary 56
CHAPTER 4 IMPLEMENTATION AND EXPERIMENTAL RESULTS 57
4.1. Introduction 57
4.2. Implementation of Prototype Circuit 57
4.2.1. Inductance 58
4.2.2. Charge-pump Capacitance 59
4.3. Experimental Results at Different Input Sources 61
4.3.1. Thevenin-Type DC Voltage Source 61
4.3.1.1. Proposed Boost-type DC-DC Converter with Different Control Mechanisms 61
4.3.1.2. Conventional boost converter with Different Control Mechanisms 68
4.3.1.3. Conventional Boost Convert with C1 on PV Module with Different Control Mechanisms 75
4.3.2. PV Emulator Source 82
4.3.2.1. Proposed Converter with Different Control Mechanisms 82
4.3.2.2. Conventional boost converter with Different Control Mechanism 93
4.3.2.3. Conventional boost converter with C1 on PV Module with Different Control Mechanisms 104
4.3.2.4. Internal Power Loss of PV Module 114
4.4. Summary 115
CHAPTER 5 CONCLUSIONS 116
REFFERENCES 117
APPENDIX A1 120
APPENDIX A2 121
APPENDIX A3 122
APPENDIX B1 123
APPENDIX B2 124
APPENDIX B3 125

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