本文選題：高阻抗變壓器 + 漏磁場�。� 參考：《沈陽工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著電網(wǎng)裝機(jī)容量的逐漸增大,為了限制電力系統(tǒng)的短路電流,提高電力系統(tǒng)運(yùn)行的穩(wěn)定性,越來越多的高阻抗變壓器應(yīng)用于堅(jiān)強(qiáng)電網(wǎng)建設(shè)。與常規(guī)的變壓器相比,高阻抗變壓器的漏磁密更大并且分布不均勻,導(dǎo)致結(jié)構(gòu)件的損耗增大。對(duì)于箔式繞組,因漏磁通分布不均勻而產(chǎn)生擠流效應(yīng),導(dǎo)致繞組端部的損耗密度過大,加快絕緣的老化速度,縮短了變壓器的使用壽命。隨著電力電子技術(shù)的快速發(fā)展,電力系統(tǒng)采用了大量的非線性元器件,雖然可以提高能源利用率,但是帶來了諧波污染問題。高次諧波的存在使得通過結(jié)構(gòu)件的漏磁通分布更復(fù)雜,雜散損耗進(jìn)一步增大。因此,深入研究高阻抗變壓器的雜散損耗及熱問題,具有一定的現(xiàn)實(shí)意義。首先,以型號(hào)為SCBH15-2500/10/0.48的高阻抗變壓器研究對(duì)象,對(duì)其進(jìn)行合理的簡化,建立了三維計(jì)算模型。使用電磁場軟件Magnet對(duì)模型進(jìn)行有限元計(jì)算,分別得到鐵心中的磁密分布,結(jié)構(gòu)件和繞組的漏磁密分布以及各部件的損耗。分別采用磁路法和能量法對(duì)高阻抗變壓器的短路阻抗進(jìn)行計(jì)算。通過對(duì)Team Problem 21b模型進(jìn)行計(jì)算,驗(yàn)證了Magnet軟件求解磁密和損耗的準(zhǔn)確性。其次,基于場路耦合法,采用三維非線性時(shí)諧場求解器計(jì)算結(jié)構(gòu)件的損耗值。分別采用解析法和有限元法對(duì)箔式繞組的渦流損耗進(jìn)行計(jì)算,對(duì)計(jì)算結(jié)果進(jìn)行對(duì)比與分析。采用頻域分析法,計(jì)算在不同次數(shù)的諧波條件下,高阻抗變壓器的損耗并分析對(duì)其影響較大的諧波次數(shù)。最后,闡述了高阻抗變壓器的散熱過程和求解流體場和溫度場的原理�；陂g接耦合法,將高阻抗變壓器各部件的單位體積生熱率作為熱載荷施加到計(jì)算模型中,使用Ansys CFX軟件對(duì)高阻抗變壓器的多物理場進(jìn)行求解,分析各部件的流體場和溫度場的分布情況并對(duì)不同分接電壓下,高壓繞組的溫升進(jìn)行計(jì)算。
[Abstract]:As the installed capacity of power network increases gradually, in order to limit the short-circuit current of power system and improve the stability of power system, more and more high-impedance transformers are used in the construction of strong power network. Compared with conventional transformers, high impedance transformers have higher flux leakage density and uneven distribution, which leads to the increase of loss of structural parts. For foil windings, due to the uneven distribution of leakage flux, the squeezing effect is produced, which leads to the excessive loss density at the end of the winding, speeds up the aging of insulation and shortens the service life of the transformer. With the rapid development of power electronics technology, a large number of nonlinear components are used in power system, which can improve energy efficiency, but bring harmonic pollution. The distribution of flux leakage through the structure is more complicated and the stray loss is further increased due to the existence of high order harmonics. Therefore, it is of practical significance to study the stray loss and heat of high impedance transformer. Firstly, the research object of high impedance transformer based on SCBH15-2500/10/0.48 is simplified reasonably, and a three-dimensional calculation model is established. The electromagnetic field software Magnet is used to calculate the finite element of the model, and the magnetic density distribution of the core, the leakage density distribution of the structure and windings and the loss of each component are obtained respectively. The short circuit impedance of high impedance transformer is calculated by magnetic circuit method and energy method respectively. The calculation of Team Problem 21b model verifies the accuracy of Magnet software in solving magnetic density and loss. Secondly, based on the field-circuit coupling method, a three-dimensional nonlinear time-harmonic field solver is used to calculate the loss value of the structure. The eddy current loss of foil winding is calculated by analytic method and finite element method, and the calculated results are compared and analyzed. The frequency domain analysis method is used to calculate the loss of high impedance transformer under the condition of different harmonics and to analyze the number of harmonics which have a great influence on it. Finally, the heat dissipation process of high impedance transformer and the principle of solving fluid field and temperature field are described. Based on indirect coupling method, the unit volume heat generation rate of each component of high impedance transformer is applied to the calculation model as thermal load, and the multi-physical field of high impedance transformer is solved by Ansys CFX software. The distribution of fluid field and temperature field of each component is analyzed and the temperature rise of high voltage winding is calculated under different demultiplexing voltages.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM41

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