【摘要】：掌握GIC侵害變壓器衍生的無功(簡稱GIC-Q)擾動(dòng)是分析變壓器GIC直流偏磁的影響和制定地磁暴電網(wǎng)災(zāi)害防御策略的依據(jù)。針對(duì)1000k V特高壓電網(wǎng)采用的單相四柱式的特高壓變壓器,從工程防災(zāi)的角度,本文提出研究基于K值算法的特高壓主體變的GIC-Q擾動(dòng),研究內(nèi)容和主要結(jié)論如下:(1)針對(duì)我國自行設(shè)計(jì)制造的單相四柱式特高壓變壓器的鐵芯結(jié)構(gòu)、繞組布置以及調(diào)壓補(bǔ)償變的結(jié)構(gòu)與特性,分析了單相四柱式變壓器GIC-Q損耗的形成機(jī)理、物理機(jī)制以及影響因素。結(jié)果表明,在準(zhǔn)直流GIC的作用下特高壓變壓器會(huì)發(fā)生半波飽和,勵(lì)磁電流畸變,無功損耗增加。且無功損耗增加的程度與變壓器的鐵芯結(jié)構(gòu)、運(yùn)行電壓等級(jí)、動(dòng)態(tài)電感、漏磁阻等因素有關(guān)。(2)根據(jù)特高壓變壓器的結(jié)構(gòu)參數(shù)和鐵芯參數(shù),建立了1000k V單相四柱式特高壓主體變的磁路-電路耦合模型,研究了變壓器的勵(lì)磁特性和無功損耗。結(jié)果表明,隨GIC的不斷增大,主體變半波飽和的程度在不斷加深,勵(lì)磁電流的畸變程度不斷增大,各次諧波的增大速率各不相同,結(jié)合無功功率計(jì)算方法,得到主體變的GIC-Q損耗與GIC近似呈線性變化,確定了單相四柱式主體變的比例系數(shù)K值為2.44,并對(duì)比計(jì)算出誤差滿足工程計(jì)算的要求。(3)比較分析了不同型號(hào)變壓器的GIC無功損耗。結(jié)果表明,在一定范圍內(nèi),隨著GIC的增大,1000k V單相四柱式特高壓主體變的GIC無功損耗增大的速率較普通的變壓器大。在相同GIC大小下,單相四柱式特高壓主體變的GIC-Q損耗較普通單相變壓器大。因此,特高壓電網(wǎng)遭受的地磁暴的侵害,更易產(chǎn)生較大的GIC-Q波動(dòng),是地磁暴災(zāi)害防御研究的重點(diǎn)。
[Abstract]:To master the reactive power (GIC-Q) disturbance derived from GIC infringing transformers is the basis of analyzing the influence of DC bias of transformer GIC and formulating the disaster prevention strategy of geomagnetic storm power network. In view of the single-phase four-column UHV transformer used in 1000kV UHV power network, from the point of view of engineering disaster prevention, the GIC-Q disturbance of UHV main transformer based on K-value algorithm is studied in this paper. The research contents and main conclusions are as follows: (1) the structure and characteristics of the core structure, winding arrangement and voltage regulation compensation of the single-phase four-column UHV transformer designed and manufactured by our country are discussed. The formation mechanism, physical mechanism and influencing factors of GIC-Q loss of single phase four-column transformer are analyzed. The results show that the UHV transformer will occur half-wave saturation, excitation current distortion and increase of reactive power loss under the action of quasi-DC GIC. And the increase of reactive power loss is related to the core structure, operating voltage grade, dynamic inductance, leakage reluctance and other factors. (2) according to the structural parameters and core parameters of UHV transformer, The magnetic circuit-circuit coupling model of 1000kV single-phase four-column UHV main body variable is established. The excitation characteristics and reactive power loss of the transformer are studied. The results show that with the increasing of GIC, the saturation degree of the main variable half-wave is deepening, the distortion of the excitation current is increasing, and the increasing rate of the harmonic is different, combined with the reactive power calculation method. It is obtained that the GIC-Q loss of the main variable is linear with that of the GIC, and the ratio coefficient K of the single-phase four-column main variable is determined to be 2.44. The calculation error is compared to meet the requirements of engineering calculation. (3) the reactive power loss of GIC of different types of transformers is compared and analyzed. The results show that in a certain range, with the increase of GIC, the reactive power loss of GIC with 1000kV single-phase four-column UHV main variable is higher than that of ordinary transformer. Under the same GIC size, the GIC-Q loss of single-phase four-column UHV main variable is higher than that of ordinary single-phase transformer. Therefore, geomagnetic storms in UHV power grids are more likely to cause large GIC-Q fluctuations, which is the focus of the research on geomagnetic storm disaster prevention.
【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
【分類號(hào)】：TM41

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