【摘要】：隨著全球經(jīng)濟(jì)的發(fā)展及電能需求的增加，大電網(wǎng)暴露的問(wèn)題日益增多，微電網(wǎng)技術(shù)作為電網(wǎng)發(fā)展的新方向成為近年來(lái)研究熱點(diǎn)之一。微源并網(wǎng)采用的逆變器及微電網(wǎng)中存在的其他電力電子裝置，會(huì)給微電網(wǎng)帶來(lái)大量的諧波污染。而風(fēng)力發(fā)電與光伏發(fā)電具有很強(qiáng)的隨機(jī)性，使微電網(wǎng)電能質(zhì)量特別是諧波問(wèn)題進(jìn)一步惡化。由于諧波問(wèn)題在微電網(wǎng)中的廣泛存在，為了保證微電網(wǎng)的穩(wěn)定、安全、經(jīng)濟(jì)運(yùn)行，本文對(duì)微電網(wǎng)的諧波抑制問(wèn)題，進(jìn)行了相關(guān)研究。 本文對(duì)微電網(wǎng)的基本結(jié)構(gòu)進(jìn)行了詳細(xì)研究，根據(jù)微電網(wǎng)的系統(tǒng)阻抗特征，建立了PV/Qf的下垂控制模型，在微電網(wǎng)控制模型的基礎(chǔ)上，，對(duì)微電網(wǎng)產(chǎn)生諧波的機(jī)理進(jìn)行的分析。根據(jù)低壓微電網(wǎng)中阻性線路阻抗及本地非線性阻容負(fù)載產(chǎn)生的諧波電壓?jiǎn)栴}，本文詳細(xì)地介紹了串聯(lián)型有源濾波器，并設(shè)計(jì)了基于瞬時(shí)無(wú)功功率理論的ip-iq的改進(jìn)方法提取諧波。通過(guò)建立串聯(lián)型有源濾波器的等效模型，分析傳統(tǒng)負(fù)載諧波電壓檢測(cè)法的不足，采用了電源諧波電流和負(fù)載諧波電壓綜合檢測(cè)法。對(duì)諧波跟蹤方法進(jìn)行了分析介紹，采用準(zhǔn)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(fù)載情況下的微電網(wǎng)仿真模型，串聯(lián)型有源濾波器可以有效地改善公共點(diǎn)處的電能質(zhì)量，驗(yàn)證了理論的有效性與合理性。 搭建了三臺(tái)逆變器的微電網(wǎng)諧波實(shí)驗(yàn)平臺(tái)，其中一臺(tái)作為串聯(lián)型有源濾波器。在實(shí)驗(yàn)平臺(tái)的基礎(chǔ)上，進(jìn)行了微電網(wǎng)下垂控制及串聯(lián)型有源電力濾波器補(bǔ)償諧波兩方面的實(shí)驗(yàn)。結(jié)果表明，微電網(wǎng)中串聯(lián)型有源濾波器改善諧波問(wèn)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(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM761;TN713.8

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