本文選題：變壓器 + 直流偏磁��； 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：太陽(yáng)活動(dòng)引起的地磁暴以及HVDC單極運(yùn)行方式會(huì)引起變壓器直流偏磁,直流偏磁會(huì)引起變壓器鐵芯飽和,從而導(dǎo)致變壓器噪音增大、振動(dòng)加劇、局部發(fā)熱嚴(yán)重,并向電網(wǎng)中輸入大量諧波,影響繼電保護(hù)裝置的正確動(dòng)作等不利影響。因此,研究直流偏磁對(duì)變壓器的影響及其抑制措施具有重要意義。本文首先對(duì)變壓器直流偏磁的產(chǎn)生機(jī)理進(jìn)行了詳細(xì)分析,并就直流偏磁給變壓器及電力系統(tǒng)帶來(lái)諸多不利影響進(jìn)行了論述。然后利用有限元分析軟件Maxwell 2D以單相變壓器為例,建立其瞬態(tài)電磁場(chǎng)分析模型,分析對(duì)比鐵芯及鐵軛在有不同直流流入情況下的內(nèi)部磁場(chǎng)變化。根據(jù)統(tǒng)一磁耦合電路(UMEC)模型,利用PSCAD/EMTDC仿真分析了不同直流電流作用下,變壓器的空載勵(lì)磁電流波形特征及諧波分析,并比較了單相、三相三柱式及三相五柱式變壓器對(duì)直流偏磁的耐受能力。最后,以加裝補(bǔ)償繞組及外加直流源補(bǔ)償法為例,在PSCAD軟件中搭建模型并進(jìn)行仿真計(jì)算,分析其抑制效果,并討論了幾種主要抑制直流偏磁措施的優(yōu)缺點(diǎn)。經(jīng)過(guò)大量仿真分析,得出結(jié)論:隨著鐵芯的飽和,漏磁通逐漸增大,導(dǎo)致漏磁通流過(guò)的位置渦流增大,發(fā)熱量升高,并且鐵芯上發(fā)熱量最高點(diǎn)出現(xiàn)在上下鐵軛與鐵芯和左右鐵軛交接處;三相三柱式變壓器耐受直流偏磁的能力最強(qiáng),單相變壓器最弱,三相五柱式變壓器的耐受能力介于二者之間;加裝補(bǔ)償繞組及外加直流源補(bǔ)償方法具有抑制直流偏磁的能力,并且抑制效果明顯。
[Abstract]:The geomagnetic storm caused by solar activity and the unipolar operation mode of HVDC will cause DC bias of transformer, and DC bias will cause saturation of transformer core, which will result in the increase of transformer noise, the intensification of vibration and the serious local heating. A large number of harmonics are input into the power network, which affects the correct operation of the relay protection device and other adverse effects. Therefore, it is of great significance to study the influence of DC bias on transformer and its suppression measures. In this paper, the generation mechanism of DC bias of transformer is analyzed in detail, and the adverse effects of DC bias on transformer and power system are discussed. Then the transient electromagnetic field analysis model of single-phase transformer is established by using the finite element analysis software Maxwell 2D, and the internal magnetic field changes of iron core and iron yoke under different DC inflow are analyzed and compared. According to the unified magnetic coupling circuit (UMEC) model, the characteristics of no-load excitation current waveform and harmonic analysis of transformer under different DC current are analyzed by PSCAD / EMTDC simulation, and the single-phase is compared. Three-phase three-column and three-phase five-column transformer to DC bias resistance. Finally, taking the compensation method of adding compensation windings and adding DC source as an example, the model is built in PSCAD software and the simulation calculation is carried out. The restraining effect is analyzed, and the advantages and disadvantages of several main measures to restrain DC bias are discussed. After a lot of simulation analysis, it is concluded that with the saturation of iron core, the flux leakage increases gradually, which leads to the increase of eddy current in the position of flux leakage and the increase of heat. And the highest point of heat generation on the core appears at the junction of the upper and lower iron yoke with the iron core and the left and right iron yoke; the three-phase three-column transformer has the strongest ability to withstand DC bias, while the single-phase transformer is the weakest. The tolerance ability of three-phase five-column transformer is between the two, and the compensation method with compensation winding and external DC source has the ability of restraining DC bias, and the restraining effect is obvious.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TM41

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