發(fā)布時間：2018-09-06 15:38

【摘要】：在能源利用方式多樣化和用電需求高標準化的形勢下，提高微電網(wǎng)供電可靠性，保證其電能質(zhì)量勢在必行，而微電網(wǎng)系統(tǒng)諧波是影響其供電質(zhì)量的主要原因之一。本文針對有效抑制微電網(wǎng)諧波的有源電力濾波器展開研究，對保證微電網(wǎng)供電質(zhì)量具有實際意義與應(yīng)用價值。 結(jié)合微電網(wǎng)中諧波源具有數(shù)量多且分散的特點，本文深入分析了微電網(wǎng)中電能產(chǎn)生和使用過程中均存在的諧波現(xiàn)象，給出了諧波源間的諧波交互影響因素，源諧波傳播過程中具有放大性，從而得出與單一諧波抑制相比，微電網(wǎng)整體諧波抑制的手段針對性不強。 本文針對傳統(tǒng)有源濾波器應(yīng)用于微電網(wǎng)系統(tǒng)時存在的增大其他節(jié)點處諧波含量問題，根據(jù)相鄰段諧波放大原理，給出了一種基于虛擬阻抗復(fù)合檢測方法的有源濾波器，利用檢測電壓與輸出電流的比例關(guān)系形成虛擬阻抗作用，抑制諧波的傳播。在有效抑制接入點處諧波含量的同時，減小了對其它節(jié)點的影響，有效地降低了系統(tǒng)整體的諧波含量。針對所采用的三角波比較跟蹤控制方法存在的諧波注入問題，設(shè)計了LCL輸出濾波器，有效消除了有源濾波器主電路開關(guān)次諧波對補償效果的影響。 采用MATLAB/simulink仿真軟件對所研究的微電網(wǎng)用有源濾波器進行仿真。仿真結(jié)果表明所設(shè)計的微電網(wǎng)用有源濾波器的有效性，，以及在多諧波源下微電網(wǎng)抑制諧波水平的提高。
[Abstract]:It is imperative to improve the reliability of micro-grid power supply and ensure its power quality under the situation of diversification of energy utilization mode and high standardization of power demand. The harmonic of micro-grid system is one of the main reasons that affect the power supply quality. In this paper, the active power filter (APF), which can effectively suppress harmonic in microgrid, is studied, which is of practical significance and application value to ensure the power supply quality of microgrid. Combined with the large number and dispersion of harmonic sources in microgrid, the harmonic phenomena in the process of generation and use of electric energy in microgrid are analyzed in this paper, and the influencing factors of harmonic interaction between harmonic sources are given. In the process of source harmonic propagation, it is shown that compared with single harmonic suppression, the overall harmonic suppression of micro-grid is less targeted than that of single harmonic suppression. Aiming at the problem of increasing harmonic content at other nodes when traditional active power filter is applied to microgrid system, according to the principle of harmonic amplification of adjacent segments, an active power filter based on virtual impedance composite detection method is presented in this paper. The virtual impedance is formed by the proportional relation between the detection voltage and the output current, and the harmonic propagation is restrained. The harmonic content at the access point is effectively suppressed, the influence on other nodes is reduced, and the harmonic content of the whole system is effectively reduced. Aiming at the harmonic injection problem in the triangle wave comparison tracking control method, the LCL output filter is designed, which effectively eliminates the influence of the switching and subharmonic of the main circuit of the active power filter on the compensation effect. The MATLAB/simulink simulation software is used to simulate the active power filter used in the microgrid. The simulation results show the effectiveness of the designed active filter for microgrid and the improvement of the harmonic suppression level of the microgrid under multi-harmonic sources.
【學(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM761;TN713.8

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