本文選題：特高壓干式平波電抗器 + 磁場(chǎng)�。� 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：由于我國(guó)能源中心和經(jīng)濟(jì)中心的偏離,使得特高壓直流輸電技術(shù)被廣泛應(yīng)用。特高壓干式平波電抗器是特高壓直流輸電工程中的重要設(shè)備,有平滑紋波,限制短路電流,防止換相失敗等重要作用,在實(shí)際工程中有著廣泛的應(yīng)用。但是關(guān)于該種電抗器在各種工況下磁場(chǎng)和電動(dòng)力的分布,以及電動(dòng)力對(duì)絕緣層的影響還未見(jiàn)文獻(xiàn)討論。本文以向家壩-上海±800kV/4000A特高壓直流輸電工程中的一臺(tái)特高壓干式平波電抗器為研究對(duì)象,針對(duì)電抗器在正常運(yùn)行時(shí)和短路時(shí)的不同情況,建立了不同的電路模型,準(zhǔn)確計(jì)算了電抗器在穩(wěn)態(tài)和暫態(tài)下的電流。在有限元分析軟件ANSYS中建立了研究對(duì)象的磁場(chǎng)模型,詳細(xì)計(jì)算了該情況下的磁場(chǎng)和電動(dòng)力分布。為深入研究電抗器包封絕緣層在受到電動(dòng)力之后的受力情況,在有限元結(jié)構(gòu)分析軟件SOLIDWORKS SIMULATION中建立了研究對(duì)象的有限元結(jié)構(gòu)分析模型,得到了各層包封的形變和應(yīng)力情況。以此為基礎(chǔ)對(duì)其機(jī)械強(qiáng)度進(jìn)行了校驗(yàn)并討論了電抗器結(jié)構(gòu)上的薄弱環(huán)節(jié),給出了改進(jìn)建議。計(jì)算的結(jié)果表明,由于在設(shè)計(jì)階段沒(méi)有足夠的考慮短路時(shí)的暫態(tài)情況,故障電流在暫態(tài)過(guò)程中循環(huán)電流和電流集中問(wèn)題十分嚴(yán)重。而電抗器由于其結(jié)構(gòu)上的原因,磁感應(yīng)強(qiáng)度分布有自?xún)?nèi)向外逐漸減小趨勢(shì),因此電流的分布應(yīng)該從內(nèi)向外逐漸緩慢增大。包封絕緣層的整體機(jī)械強(qiáng)度足夠,可以承受各種工況下的電動(dòng)力,但是局部電動(dòng)力過(guò)大可能會(huì)引發(fā)撐條掉落,線(xiàn)圈絕緣層脫離等故障,需要采取措施提高其機(jī)械強(qiáng)度。
[Abstract]:Due to the deviation of energy center and economic center, UHVDC technology is widely used in China. UHV dry flat-wave reactor is an important equipment in UHV HVDC transmission project. It has the functions of smoothing ripple limiting short-circuit current preventing commutation failure and so on. It is widely used in practical engineering. However, the distribution of magnetic field and electric force in the reactor under various conditions and the influence of the electric force on the insulation layer have not been discussed in literature. In this paper, an UHV dry flat-wave reactor in Xiangjiaba Shanghai 鹵800kV/4000A UHV HVDC transmission project is studied. Different circuit models are established for different conditions of reactor in normal operation and short circuit. The current of reactor in steady and transient state is calculated accurately. The magnetic field model of the object is established in the finite element analysis software ANSYS, and the distribution of magnetic field and electric force in this case is calculated in detail. In order to study the stress of the insulated layer of reactor after being subjected to electric force, the finite element structural analysis model of the research object was established in the finite element structure analysis software SOLIDWORKS SIMULATION, and the deformation and stress of each layer were obtained. On this basis, the mechanical strength of the reactor is checked and the weak links in the reactor structure are discussed, and suggestions for improvement are given. The calculation results show that the problem of cycle current and current concentration in the transient process is very serious because the transient situation of short circuit is not considered enough in the design phase. Because of its structure, the distribution of magnetic induction intensity decreases gradually from inside to outside, so the distribution of current should increase slowly from inside to outside. The overall mechanical strength of the encapsulated insulation layer is sufficient to withstand the electric force under various working conditions, but the excessive local electric force may lead to the fall of the braces and the isolation of the insulation layer of the coil, so it is necessary to take measures to improve the mechanical strength of the insulating layer.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM47

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