發(fā)布時(shí)間：2018-07-14 16:08

【摘要】：隨著電力電子技術(shù)的快速發(fā)展,逆變器系統(tǒng)在大功率牽引、交直流調(diào)速、不間斷電源、太陽(yáng)能光伏發(fā)電等領(lǐng)域的應(yīng)用日趨廣泛,因此逆變器調(diào)制策略成為研究熱點(diǎn)。由于PWM調(diào)制方式的局限性,造成了較大的諧波污染問題,特別是在對(duì)于開關(guān)損耗、電磁兼容、波形質(zhì)量要求較高的領(lǐng)域,如何降低逆變器輸出諧波含量已經(jīng)成為學(xué)者研究的主要課題。本文在研究多種調(diào)制策略的基礎(chǔ)上,針對(duì)抑制諧波效果較好的特定諧波消除調(diào)制策略展開了深入研究。特定諧波消除調(diào)制策略實(shí)現(xiàn)的難點(diǎn)在于特定消諧方程組的求解,目前主要的求解方法為傳統(tǒng)數(shù)值方法和智能算法,傳統(tǒng)數(shù)值方法在求解過程中依賴于初值的適當(dāng)選取,智能算法如遺傳算法、差分進(jìn)化算法容易陷入局部極值,影響求解精度。針對(duì)以上不足,本文提出以人工魚群算法對(duì)特定消諧方程組進(jìn)行求解,詳細(xì)闡述了人工魚群算法對(duì)于特定消諧問題的求解過程;針對(duì)人工魚群個(gè)體之間缺少超越可視域局限的聯(lián)系的問題,引入差分變異算子,提出改進(jìn)人工魚群算法;針對(duì)人工魚群算法參數(shù)多的特點(diǎn),對(duì)于算法中移動(dòng)步長(zhǎng)、可視域范圍、擁擠因子、差分變異算子等因素的影響進(jìn)行了詳細(xì)研究分析,最后將改進(jìn)人工魚群算法的求解結(jié)果進(jìn)行了特定消諧仿真分析和實(shí)驗(yàn)研究。本文通過將改進(jìn)人工魚群算法與其它智能算法對(duì)比,表明了其在求解消諧問題上具有一定的優(yōu)越性;應(yīng)用改進(jìn)人工魚群算法針對(duì)不同開關(guān)角數(shù)的情況進(jìn)行求解,將所得開關(guān)角用于搭建的特定消諧仿真模型,一方面能夠依據(jù)調(diào)制度有效控制基波幅值,另一方面能夠有效消除指定頻次的諧波,從而證明了改進(jìn)人工魚群算法求解的正確性和有效性;通過對(duì)改進(jìn)人工魚群算法參數(shù)的分析,選取了較優(yōu)的移動(dòng)步長(zhǎng)、可視域以及差分變異策略作為求解參數(shù);最后在兩電平逆變功率系統(tǒng)上驗(yàn)證了不同頻率、不同開關(guān)角個(gè)數(shù)下的基于改進(jìn)人工魚群算法的特定諧波消除調(diào)制策略的效果。
[Abstract]:With the rapid development of power electronic technology, inverter system has been widely used in the fields of high-power traction, AC / DC speed regulation, uninterruptible power supply, solar photovoltaic power generation and so on. Because of the limitation of PWM modulation mode, the problem of harmonic pollution is caused, especially in the field of switching loss, electromagnetic compatibility and waveform quality. How to reduce the harmonic content of inverter output has become the main research topic of scholars. Based on the research of various modulation strategies, this paper makes a deep research on the specific harmonic elimination modulation strategy which has better harmonic suppression effect. The difficulty of realizing the special harmonic elimination and modulation strategy lies in the solution of the specific harmonic elimination equations. At present, the main methods are traditional numerical method and intelligent algorithm. The traditional numerical method depends on the proper selection of initial value in the process of solution. Intelligent algorithm such as genetic algorithm, differential evolution algorithm is easy to fall into the local extremum, which affects the accuracy of the solution. In order to solve the above problems, the artificial fish swarm algorithm is proposed to solve the specific harmonic elimination equations, and the process of solving the specific harmonic elimination problem by artificial fish swarm algorithm is described in detail. In view of the lack of contact between artificial fish groups beyond the limits of horizon, the difference mutation operator is introduced to improve the artificial fish swarm algorithm. In view of the characteristics of the artificial fish swarm algorithm with many parameters, the moving step size and the visual domain range of the artificial fish swarm algorithm are discussed. The effects of crowding factor and differential mutation operator are analyzed in detail. Finally, the results of the improved artificial fish swarm algorithm are simulated and tested. By comparing the improved artificial fish swarm algorithm with other intelligent algorithms, it is shown that the improved artificial fish swarm algorithm has certain advantages in solving harmonic elimination problems, and the improved artificial fish swarm algorithm is applied to solve different switching angles. The switching angle can be used to build a special harmonic elimination simulation model. On the one hand, it can effectively control the amplitude of the fundamental wave according to the modulation system, on the other hand, it can effectively eliminate the harmonics of the specified frequency. Through the analysis of the parameters of the improved artificial fish swarm algorithm, the optimal moving step size, visual domain and differential mutation strategy are selected as the solution parameters. Finally, the effect of the special harmonic elimination modulation strategy based on the improved artificial fish swarm algorithm with different frequency and number of switching angles is verified on a two-level inverter power system.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM714.3;TP18

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本文編號(hào)：2122193