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  本文選題：非線性負荷 + 諧波耦合導納矩陣模型�。� 參考：《重慶大學》2014年碩士論文

【摘要】：低壓配電系統(tǒng)中廣泛分布著大量非線性負荷，隨著電力電子技術的發(fā)展，這些非線性負荷的種類和數(shù)量還會不斷增長。由于這些負荷的電流總諧波畸變率大(有些甚至超過100%)，嚴重影響系統(tǒng)的電能質量，因此其諧波問題一直是學者們關注、研究的課題。本文深入研究了單相不可控橋式整流電容濾波類負荷的諧波耦合導納矩陣模型，并改進了原有的模型，建立起了精確的諧波耦合導納矩陣模型。利用這一諧波模型，分析研究了該類負荷的諧波衰減特性，提出了兩個表征負荷諧波衰減效應的新指標；另一方面，本文還分析了諧波耦合導納矩陣模型與諧波諾頓模型之間的關系，并對諧波諾頓模型成立條件、參數(shù)求解等方面的問題進行了研究。具體來說，本文的主要工作如下： ①通過改進求解電路的方法，得到單相不可控橋式整流電容濾波電路的精確解，在此基礎上建立了基于這類電路的非線性負荷的精確諧波耦合導納矩陣模型。 ②針對個人電腦、液晶顯示器等典型單相非線性負荷的等效電路建立了一種有效的電路參數(shù)估計方法，在驗證這種方法切實有效的基礎上利用其對上述諧波模型進行驗證。 ③利用本文建立的諧波耦合導納矩陣模型分析典型單相非線性負荷的諧波特性及其諧波衰減(或放大)效應的機理和主要影響因素。在此基礎之上提出了兩個表征諧波衰減特性的新指標，，通過仿真驗證了這兩個指標的有效性。 ④對諧波諾頓模型與諧波耦合導納矩陣模型之間的關系以及諧波諾頓模型成立條件、模型參數(shù)變化、模型參數(shù)求解等方面的問題進行研究，指出了傳統(tǒng)的求解諧波諾頓模型參數(shù)的問題，并給出了改進方法。通過實驗驗證了改進后的諧波諾頓模型的有效性。
[Abstract]:A large number of nonlinear loads are widely distributed in low-voltage distribution systems. With the development of power electronics technology, the types and quantities of these nonlinear loads will continue to increase. Because the total harmonic distortion rate of the current of these loads is large (some even more than 100), it seriously affects the power quality of the system, so the harmonic problem has always been concerned and studied by scholars. In this paper, the harmonic coupling admittance matrix model of single-phase uncontrollable bridge rectifier capacitor filter is studied, and the original model is improved, and the accurate harmonic coupling admittance matrix model is established. By using this harmonic model, the harmonic attenuation characteristics of this kind of load are analyzed, and two new indexes are proposed to characterize the harmonic attenuation effect of the load. This paper also analyzes the relationship between harmonic coupled admittance matrix model and harmonic Norton model, and studies the establishment condition and parameter solution of harmonic Norton model. Specifically, the main work of this paper is as follows: 1 by improving the method of solving the circuit, the exact solution of single-phase uncontrollable bridge rectifier capacitor filter circuit is obtained, and the accurate harmonic coupling admittance matrix model of nonlinear load based on this kind of circuit is established. (2) an effective circuit parameter estimation method for typical single-phase nonlinear load equivalent circuits such as personal computer and liquid crystal display is established. The method is used to verify the harmonic model mentioned above on the basis of verifying the effectiveness of this method. 3Using the harmonic coupling admittance matrix model established in this paper, the harmonic characteristics of typical single-phase nonlinear load, the mechanism of harmonic attenuation (or amplification) effect and the main influencing factors are analyzed. On this basis, two new indexes are proposed to characterize the harmonic attenuation characteristics, and the effectiveness of the two indexes is verified by simulation. 4. The relationship between harmonic Norton model and harmonic coupled admittance matrix model, the establishment condition of harmonic Norton model, the variation of model parameters and the solution of model parameters are studied. The traditional problem of solving the parameters of harmonic Norton model is pointed out, and the improved method is given. The effectiveness of the improved harmonic Norton model is verified by experiments.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM714

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