【摘要】：隨著全球經濟的發(fā)展及電能需求的增加，大電網暴露的問題日益增多，微電網技術作為電網發(fā)展的新方向成為近年來研究熱點之一。微源并網采用的逆變器及微電網中存在的其他電力電子裝置，會給微電網帶來大量的諧波污染。而風力發(fā)電與光伏發(fā)電具有很強的隨機性，使微電網電能質量特別是諧波問題進一步惡化。由于諧波問題在微電網中的廣泛存在，為了保證微電網的穩(wěn)定、安全、經濟運行，本文對微電網的諧波抑制問題，進行了相關研究。 本文對微電網的基本結構進行了詳細研究，根據微電網的系統(tǒng)阻抗特征，建立了PV/Qf的下垂控制模型，在微電網控制模型的基礎上，，對微電網產生諧波的機理進行的分析。根據低壓微電網中阻性線路阻抗及本地非線性阻容負載產生的諧波電壓問題，本文詳細地介紹了串聯(lián)型有源濾波器，并設計了基于瞬時無功功率理論的ip-iq的改進方法提取諧波。通過建立串聯(lián)型有源濾波器的等效模型，分析傳統(tǒng)負載諧波電壓檢測法的不足，采用了電源諧波電流和負載諧波電壓綜合檢測法。對諧波跟蹤方法進行了分析介紹，采用準比例諧振控制器跟蹤諧波電壓。本文在MATLAB/Simulink軟件環(huán)境下建立了非線性負載情況下的微電網仿真模型，串聯(lián)型有源濾波器可以有效地改善公共點處的電能質量，驗證了理論的有效性與合理性。 搭建了三臺逆變器的微電網諧波實驗平臺，其中一臺作為串聯(lián)型有源濾波器。在實驗平臺的基礎上，進行了微電網下垂控制及串聯(lián)型有源電力濾波器補償諧波兩方面的實驗。結果表明，微電網中串聯(lián)型有源濾波器改善諧波問題的有效性。
[Abstract]:With the development of global economy and the increase of power demand, the problems exposed to large power grids are increasing day by day. As a new direction of power grid development, microgrid technology has become one of the research hotspots in recent years. The inverter and other power electronic devices used in the microgrid will bring a lot of harmonic pollution to the microgrid. Wind power generation and photovoltaic generation have strong randomness, which makes the power quality of micro-grid, especially harmonic problem, worse. In order to ensure the stability, safety and economic operation of micro-grid, the harmonic suppression problem of micro-grid is studied in this paper. In this paper, the basic structure of microgrid is studied in detail. According to the impedance characteristics of microgrid, the droop control model of PV/Qf is established. Based on the control model of microgrid, the mechanism of harmonic generation in microgrid is analyzed. According to the harmonic voltage problem caused by impedance of resistive line and local nonlinear resistive load in low voltage microgrid, the series active power filter is introduced in detail in this paper. An improved method of ip-iq based on instantaneous reactive power theory is designed to extract harmonics. By establishing the equivalent model of series active power filter and analyzing the deficiency of traditional load harmonic voltage detection method, the comprehensive detection method of power harmonic current and load harmonic voltage is adopted. The harmonic tracking method is analyzed and introduced, and the harmonic voltage is tracked by the quasi-proportional resonance controller. In this paper, the simulation model of microgrid under nonlinear load is established in the environment of MATLAB/Simulink software. The series active power filter can effectively improve the power quality of common points, and verify the validity and rationality of the theory. The harmonic experiment platform of three inverters is built, one of which is used as series active power filter. On the basis of the experimental platform, the experiments of microgrid droop control and series active power filter harmonic compensation are carried out. The results show that the series active filter in microgrid is effective to improve the harmonic problem.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761;TN713.8

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