孤立微電網下電力轉換器P-f/Q-V'垂降控制線性化模型分析及實作

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研究生：	林冠竹 Lin, Kuan Chu
論文名稱：	孤立微電網下電力轉換器P-f/Q-V'垂降控制線性化模型分析及實作 P-f/Q-V' Droop Control of Multi Converters in Isolated Micro-Grids: Linearized System Analysis and Hardware Implementations
指導教授：	朱家齊 Chu, Chia Chi
口試委員:	謝振中 Shieh, Jenn Jong 張偉能 Chang, Wei Neng 連國龍 Lian, Kuo Lung
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：	2015
畢業學年度：	103
語文別：	英文
論文頁數：	60
中文關鍵詞：	垂降控制、孤島模式、穩定度分析、電壓源轉換器、微電網
外文關鍵詞：	Droop control, Islanding mode, Stability, Voltage Source Converter, Microgrid
相關次數：	點閱：3 下載：0
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在微電網系統中，相較於以往傳統電網使用集中式發電的方式，分散式發電更適用於講究綠色能源的現代。而如何使各分散式發電源做合理的功率輸出分配是相當重要的一個議題。而垂降控制法能有效的使電網中的電力轉換器做出合理的功率分配；其中，𝑃−𝑓/𝑄−V'垂降控制法能有效的處理實功分配的問題，而在虛功方面，也改善了傳統垂降控制易受輸出線阻抗影響的缺點。本論採用𝑃−𝑓/𝑄−V'垂降控制作為微電網中功率分配之控制法。
為了可以快速的檢測微電網系統之穩定度，本論文提出一個應用𝑃−𝑓/𝑄−V' ̇垂降控制之微電網的系統降階穩定度分析模型。由於一般稍具規模的微電網系統之數學模型相當複雜，為了能快速的驗證微電網系統的穩定情形，所以應用了座標轉換及線性化之數學技巧，將複雜之微電網穩定度數學模型簡化；降階簡化後之數學模型只需考慮逆變器間之傳輸線阻抗及垂降控制係數即可判斷微電網系統之穩定度情形。本論文最後以實際系統參數代入降階穩定度模型，並配合Simulink模擬以及硬體實驗驗證降階穩定度模型之準確性。最終的三機模擬及兩機實驗結果證實，降階模型找出之會致使系統主極點到不穩定域的理論垂降增益值，跟實際模擬及實驗之造成系統開始不穩定之垂降增益直數量級很接近;此結果也證實此數學模型確實提供一個快速設計垂降增益之方法。

The droop control method is one of the issues for proper power distributions in isolated microgrids; in this thesis, the 𝑃−𝑓/𝑄−V ̇ droop control method will be analyzed by linearized systems. One salient feature is that the 𝑃−𝑓/𝑄−V ̇ droop control method can effectively regulate the power sharing among the inverters in the microgrid. It indeed solves the problem of the improper reactive power sharing by conventional droop control methods.
In order to capture the essential stability issues in the 𝑃−𝑓/𝑄−V ̇ droop control method, the reduced-ordered model is proposed first in this thesis. Then the analysis will be proceeded by the corresponding transfer matrix. Under certain conditions, it can be shown that the stability of the microgrid system can be determined by impedances of transmissions between the inverters and the droop gains. Simulation studies will be performed on Simulink. Techniques about the root locus are utilize to examine the sensitivity of each parameters used in the droop control. In order to validate the proposed method, experimental studies will be conducted by verify the feasibility and the correctness of the proposed method.

Abstract    II
摘要    IV
Acknowledgements    IV
Table of Contents    VI
List of Illustrations    VIII
List of Tables    X
Chapter 1 Introduction    1
1.1 Background and Motivation    2
1.2 Contribution    2
1.3 Organization of the Thesis    3
Chapter 2 Droop control Method    4
2.1 Introduction    4
2.2 Droop Control Method    4
2.2.1 CONVENTIONAL 𝑃−𝑓/𝑄−V DROOP CONTROL METHOD    4
2.2.1 𝑃−𝑓/𝑄−V ̇ DROOP CONTROL METHOD WITH VOLTAGE RESTORATION    4
2.3 Summary    8
Chapter 3 stablility analysis of linearized modles    9
3.1 Introduction    9
3.2 Microgrid Construction    9
3.2.1 MICROGRID MODEL TOPOLOGY    9
3.2.2 MICROGRID PLANT MODEL    10
3.2.3 MICROGRID MODEL REDUCTIONS    14
3.2 P-f/Q-V ̇  Droop Control with Voltage Restoration Equations    16
3.3 Closed-loop Microgrid Model Analysis    19
3.4 Summary    25
Chapter 4 hardware implimentation    26
4.1 Introduction    26
4.2 Hardware experiment plant    27
4.2.1 SINGLE VOLTAGE SOURCE CONVERTER    27
4.2.2 DSP28335 DEVELOPMENT BOARD    28
4.2.3 PROTECTION BOARD    30
4.2.4 GATE DRIVER    31
4.2.5 POWER STAGE    31
Chapter 5 Simulations and Hardware Experiments    33
5.1 Introduction    33
5.2 Poles and Zeros Analysis    33
5.3 Time Domain Simulations    41
5.4 Hardware Experiment Results    47
5.5 Summary    56
Chapter 6 Conclusions and future dirctions    57
Reference    58

                                

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