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研究生：	葉奕廷 Yi, Ting-Ye
論文名稱：	具低諧波電流控制之電網形成換流器研製 Design and Implement a Grid Forming Inverter with Low Harmonic Current Control
指導教授：	陳建富 Chen, Jiann-Fuh
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電機工程學系 Department of Electrical Engineering
論文出版年：	2023
畢業學年度：	111
語文別：	英文
論文頁數：	91
中文關鍵詞：	電網形成、下垂控制、中性點箝位換流器、電力諧波
外文關鍵詞：	Grid-Forming, Droop control, Neutral point clamped inverter, Power harmonics
相關次數：	點閱：87 下載：0
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本文提出一種基於電網形成技術的諧波電流控制方法，透過帕克轉換可以將換流器輸出電流中所含的高次諧波濾出，再透過控制器產生抑制換流器輸出諧波電流的調製波，以此抵銷換流器輸出電流的諧波含量，進而保護換流器設備不受諧波電流影響。本文以三相三階中性點箝位換流器作為電網形成換流器的架構，此架構相較於傳統二階換流器具有較低諧波失真與較小的開關電壓應力等優點。以軟體MATLAB Simulink模擬額定功率3 kW、輸入電壓800 V、輸出電壓220 V_rms、切換頻率為50 kHz 及電源頻率為60 Hz之電網形成換流器控制。模擬結果顯示加入諧波電流控制後換流器輸出電流五次及七次的諧波含量分別降為0.48% 與 0.95%。實作結果則可將換流器輸出電流五次及七次的諧波含量分別降為3.8% 與 3.58%，並證實了本文控制方法的可行性。

This thesis proposes a harmonic current control method based on grid-forming technology. The high-order harmonics contained in the output current of the inverter can be filtered out through the Park transform, and then the modulation wave that suppresses the output harmonic current of the inverter is generated through the controller. In this way, the harmonic content of the output current of the inverter is offset, thereby protecting the inverter equipment from the influence of the harmonic current. In this paper, the three-phase three-level neutral-point clamped (NPC) inverter is used as the grid-forming inverter architecture. Compared with the conventional two-level inverter, this architecture has the advantages of lower harmonic distortion and smaller switching voltage stress. Use software MATLAB Simulink to simulate the inverter control of the power grid with rated power 3 kW, input voltage 800 V, output voltage 220 V_rms, switching frequency 50 kHz and line frequency 60 Hz. The simulation results show that after applying harmonic current control, the 5th and 7th harmonic contents of the output current of the inverter are reduced to 0.48% and 0.95%, respectively. Experimental results show that the 5th and 7th harmonic currents output by the inverter are reduced to 3.8% and 3.58%, respectively, and confirmed the feasibility of the purposed control method.

摘要	I
ABSTRACT	II
誌  謝	III
CONTENTS	1
List of Figures	4
List of Table	8
Chapter 1 Specific Objective	9
1 Research Background and Purpose	9
2 Structure	11
Chapter 2 Literature Review	12
1 Multilevel Inverter	12
1.1 Cascaded H-Bridge Multilevel Inverter	14
1.2 Flying Capacitor Multilevel Inverter	15
1.3 Neutral-Point Clamped Multilevel Inverter	17
2 Common inverter filter topologies	21
2.1 L Filter	21
2.2 LC Filter	22
2.3 LCL Filter	23
3 Operation Principle of Adopted Circuit [10]	23
3.1 Operating Principle when eX > 0 and iLinv > 0	26
3.2 Operating Principle when eX > 0 and iLinv < 0	31
4 Clarke and Park Transformation	37
4.1 Clarke Transformation (αβ0 coordinate)	37
4.2 Park Transformation (dq0 coordinate)	39
4.3 Comparison of Different Coordinate	40
5 Phase-Locked Loop (PLL)	42
6 Harmonics in Electrical System	43
6.1 Harmonic Sources	43
6.2 Adverse Effects of Harmonics	44
6.3 Total Harmonic Distortion Specifications	45
Chapter 3 Methodology	46
1 Droop Control	47
2 Three Phase Inverter Modeling	49
2.1 Mathematic Model Under abc Coordinate	50
2.2 Mathematic Model Under αβ0 Coordinate	51
2.3 Mathematic Model Under dq0 Coordinate	52
3 Dual-loop Control Under dq0 Coordinate	52
3.1 Current Loop Decouple	53
3.2 Voltage Loop Decouple	54
4 Output Harmonics Current Control	56
Chapter 4 Parameter Design	59
1 Filter Design	60
1.1 Inverter Side Inductor Design	61
1.2 Filter Capacitor Design	63
1.3 Grid Side Inductor Design	63
2 Controller Design	64
2.1 Current Loop Design	65
2.2 Voltage Loop Design	66
3 Droop Control Parameter Design	68
Chapter 5 Simulation and Experimental Results	69
1 Simulation Results	69
1.1 Simulation of Closed Loop Control	69
1.2 Simulation of Grid Connecting	70
1.3 Simulation of 5th and 7th Harmonics Current Control	74
2 Experimental Results	80
2.1 Operation in off-grid state	82
2.2 Operation in grid-connected state	83
2.3 5th and 7th Harmonics Current Control	84
Chapter 6 Conclusions and Future Works	87
1 Conclusions	87
2 Future Works	87
References	89
                                    

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校內：2028-08-24公開
校外：2028-08-24公開電子論文尚未授權公開，紙本請查館藏目錄

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