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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳耀銘 | zh_TW |
| dc.contributor.advisor | Yaow-Ming Chen | en |
| dc.contributor.author | 施建亨 | zh_TW |
| dc.contributor.author | Chien-Heng Shih | en |
| dc.date.accessioned | 2024-08-26T16:11:21Z | - |
| dc.date.available | 2024-08-27 | - |
| dc.date.copyright | 2024-08-26 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-08-14 | - |
| dc.identifier.citation | [1] U. k. Nath and R. Sen, "A Comparative Review on Renewable Energy Application, Difficulties and Future Prospect," 2021 Innovations in Energy Management andRenewable Resources(52042), 2021, pp. 1-5.
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Blaabjerg,"Review of Energy Storage System Technologies in Microgrid Applications: Issuesand Challenges," IEEE Access, vol. 6, pp. 35143-35164, 2018. [7] J. C. Beardsall, C. A. Gould and M. Al-Tai, "Energy storage systems: A review ofthe technology and its application in power systems," 2015 50th InternationalUniversities Power Engineering Conference (UPEC), 2015, pp. 1-6. [8] T. S. Babu, K. R. Vasudevan, V. K. Ramachandaramurthy, S. B. Sani, S. Chemudand R. M. Lajim, "A Comprehensive Review of Hybrid Energy Storage Systems:Converter Topologies, Control Strategies and Future Prospects," IEEE Access, vol.8, pp. 148702-148721, 2020. [9] B. Frieske, M. Kloetzke and F. Mauser, "Trends in vehicle concept and keytechnology development for hybrid and battery electric vehicles," 2013 WorldElectric Vehicle Symposium and Exhibition (EVS27), 2013, pp. 1-12. [10] A. S. 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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/95001 | - |
| dc.description.abstract | 本論文提出應用於三相四線式併網換流器之中性線電流漣波抑制策略。無論三相系統是否平衡，因開關切換造成的高頻漣波電流依然會在中性線上。相較於三相系統不平衡所產生的中性線電流，因功率開關切換所造成的高頻電流漣波會往往被忽略。當有多組三項四線併網換流器會併接到相同電網時，會造成公用的中性線電流上的漣波疊加。並且因為各組併網換流器的切換頻率沒有同步，造成共用的中性線上的電流漣波難以估計。另一方面因為中性線會連接到直流端分離電容的中性點上，將導致分離式電容出現比預期更大的漣波電壓，影響電容的壽命，進而降低併網換流器的可靠度。
為了降低中性線上因開關切換造成的電流漣波，本論文提出中性線電流漣波抑制策略。在本論文中先利用雙重傅立葉級數的分析，推導出中性線電流漣波的數學模型。並且利用此數學模型提出的兩種三相換流器的載波相移策略，來達到降低中性線電流漣波的目的。本論文中首先將詳細說明中性線電流漣波的數學模型推導。然後提出固定載波相移策略與次序載波相移策略，並且說明兩種利用載波相移達成中性線電流漣波抑制策略。並藉由電腦模擬來驗證數學模型的準確性與電流漣波降低的可行性。最後實作一組三相5kVA 併網換流器的原型機，來驗證本論文所提出的中性線電流漣波抑制策略的正確性。實驗結果得到與傳統載波相比，固定載波相移策略將中性線電流漣波的均方根值降低了60.944%，峰對峰值降低了57.96%。次序載波策略將中性線電流漣波的均方根值降低了71.08%，峰對峰值降低了65.6%。 | zh_TW |
| dc.description.abstract | This thesis proposes two neutral line current ripple suppression strategies for threephase four-wire grid-tied inverters. Regardless of whether the three-phase system is balanced, high-frequency ripple current caused by switching will still appear on the neutral line. Compared to the neutral line current generated by the imbalance of the threephase system, the high-frequency current ripple caused by power switching is often overlooked. When multiple sets of three-phase four-wire grid-tied inverters are connected to the same grid, the ripple on the neutral line current will superimpose. Because the switching frequencies of each set of grid-connected inverters are not synchronized, the ripple current on the shared neutral line becomes difficult to estimate. On the other hand, since the neutral line is connected to the neutral point of the DC-side split capacitors, it will result in larger than expected ripple voltage on the split capacitors, affecting the lifetime of the capacitors and thus reducing the reliability of the grid-connected inverters.
To reduce the current ripple on the neutral line caused by switching, this thesis proposes two neutral line current ripple suppression strategies. First, the double Fourier series analysis is used to derive the mathematical model of the neutral line current ripple. Using this mathematical model, two carrier phase shift strategies for three-phase inverters are proposed to reduce the neutral line current ripple. This thesis will first detail the derivation of the mathematical model of the neutral line current ripple. Then, the constant carrier phase shift (CCPS) strategy and the sequential carrier phase shift (SCPS) strategy are proposed, explaining how these two carrier phase shifting strategies achieve neutral line current ripple suppression. The accuracy of the mathematical model and the feasibility of reducing the current ripple are verified through computer simulations. Finally, a prototype of a three-phase 5kVA grid-tied inverter is implemented to validate the correctness of the proposed neutral line current ripple suppression strategies proposed in this thesis. Experimental results show that, compared to the conventional carrier strategy, the CCPS strategy reduces the RMS value of the neutral line current ripple by 60.944% and the peak-to-peak value by 57.96%. The SCPS strategy reduces the RMS value of the neutral line current ripple by 71.08% and the peak-to-peak value by 65.6%. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-08-26T16:11:21Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-08-26T16:11:21Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員審定書 i
致謝 ii 摘要 iii ABSTRACT iv 目次 vi LIST OF FIGURES ix LIST OF TABLES xv Chapter 1 Introduction 1 1.1 Background 1 1.2 Literature Review and Motivation 2 1.3 Chapter Outline 4 Chapter 2 Three-Phase Grid-tied Inverters 6 2.1 Grid-Tied Inverter Topologies 6 2.2 Per-Phase Control 8 2.2.1 Equivalent Single-Phase Half-Bridge Unit 8 2.2.2 Sinusoidal Pulse Width Modulation (SPWM) 9 2.2.3 Control Scheme 10 2.2.4 Phase Lock Loop (PLL) 13 Chapter 3 Mitigation of Neutral Line Current Ripple 16 3.1 Analysis of Neutral Line Current Ripple 16 3.2 Computer Simulation and Verification 23 3.3 Three-phase Carrier Shift Strategies 33 3.3.1 Constant Carrier Phase Shift Strategy 33 3.3.2 Sequential Carrier Phase Shift Strategy 35 3.3.3 The comparison of the neutral line current ripple for all strategies 41 Chapter 4 Hardware Design and DSP Program 44 4.1 Power Stage 45 4.1.1 Power Switch 45 4.1.2 Design of Filter Inductor 46 4.1.3 Design of DC-Link Spilt Capacitor 47 4.2 Control Stage 47 4.2.1 Microcontroller 48 4.2.2 Peripheral Circuit 49 4.2.2 Voltage and Current Sensing Circuit 50 4.2.4 Driver Circuit 52 4.3 System Control Procedure 54 4.3.1 Three-phase Carrier Shift Strategies Flow 54 4.3.2 Main Program 56 4.3.3 Interrupt Functions 58 4.4 Implementation and Modification of Carrier Shift Function 63 4.4.1 Implementation of Carrier Shift Function 63 4.4.2 Modification of Carrier Shift Function 66 Chapter 5 Experimental Verification 70 5.1 Circuit Diagram and Test Condition 70 5.2 Experimental Results of Conventional Three-phase Carrier 71 5.3 Experimental Results of Three-phase Carrier Phase Shift Strategies 74 5.3.1 Experimental Results of Constant Carrier Phase Shift Strategy 74 5.3.2 Experimental Results of Sequential Carrier Phase Shift Strategy 77 5.3 Comparison of neutral line current ripple for all strategies in the experiment 80 Chapter 6 Conclusion and Suggested Future Work 83 6.1 Summary 83 6.2 Suggested Future Works 84 APPENDIX 85 A. Analyzing the Mathematical Model of Switching Node Voltage Using Double Fourier Series 85 REFERENCES 91 | - |
| dc.language.iso | en | - |
| dc.subject | 市電併網換流器 | zh_TW |
| dc.subject | 三相載波相移策略 | zh_TW |
| dc.subject | 中性線電流漣波 | zh_TW |
| dc.subject | 三相四線式換流器 | zh_TW |
| dc.subject | 雙重傅立葉級數 | zh_TW |
| dc.subject | grid-tied inverter | en |
| dc.subject | double Fourier series | en |
| dc.subject | neutral line current ripple | en |
| dc.subject | three-phase four-wire inverters | en |
| dc.subject | three-phase carrier shift strategy | en |
| dc.title | 三相四線市電併聯換流器中性線電流漣波抑制 | zh_TW |
| dc.title | Neutral Line Current Ripple Mitigation for Three- Phase Four-Wire Grid-Tied Inverters | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 羅國原;陳景然;唐丞譽 | zh_TW |
| dc.contributor.oralexamcommittee | Kuo-Yuan Lo;Ching-Jan Chen;Cheng-Yu Tang | en |
| dc.subject.keyword | 市電併網換流器,三相四線式換流器,中性線電流漣波,雙重傅立葉級數,三相載波相移策略, | zh_TW |
| dc.subject.keyword | grid-tied inverter,three-phase four-wire inverters,neutral line current ripple,double Fourier series,three-phase carrier shift strategy, | en |
| dc.relation.page | 100 | - |
| dc.identifier.doi | 10.6342/NTU202404220 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2024-08-14 | - |
| dc.contributor.author-college | 電機資訊學院 | - |
| dc.contributor.author-dept | 電機工程學系 | - |
| dc.date.embargo-lift | 2029-08-12 | - |
| 顯示於系所單位： | 電機工程學系 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-112-2.pdf 未授權公開取用 | 6.95 MB | Adobe PDF | 檢視/開啟 |
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