基于K值法的单相四柱式特高压变压器的GIC-Q损耗计算

发布时间：2018-11-03 14:33

【摘要】：掌握GIC侵害变压器衍生的无功(简称GIC-Q)扰动是分析变压器GIC直流偏磁的影响和制定地磁暴电网灾害防御策略的依据。针对1000k V特高压电网采用的单相四柱式的特高压变压器,从工程防灾的角度,本文提出研究基于K值算法的特高压主体变的GIC-Q扰动,研究内容和主要结论如下:(1)针对我国自行设计制造的单相四柱式特高压变压器的铁芯结构、绕组布置以及调压补偿变的结构与特性,分析了单相四柱式变压器GIC-Q损耗的形成机理、物理机制以及影响因素。结果表明,在准直流GIC的作用下特高压变压器会发生半波饱和,励磁电流畸变,无功损耗增加。且无功损耗增加的程度与变压器的铁芯结构、运行电压等级、动态电感、漏磁阻等因素有关。(2)根据特高压变压器的结构参数和铁芯参数,建立了1000k V单相四柱式特高压主体变的磁路-电路耦合模型,研究了变压器的励磁特性和无功损耗。结果表明,随GIC的不断增大,主体变半波饱和的程度在不断加深,励磁电流的畸变程度不断增大,各次谐波的增大速率各不相同,结合无功功率计算方法,得到主体变的GIC-Q损耗与GIC近似呈线性变化,确定了单相四柱式主体变的比例系数K值为2.44,并对比计算出误差满足工程计算的要求。(3)比较分析了不同型号变压器的GIC无功损耗。结果表明,在一定范围内,随着GIC的增大,1000k V单相四柱式特高压主体变的GIC无功损耗增大的速率较普通的变压器大。在相同GIC大小下,单相四柱式特高压主体变的GIC-Q损耗较普通单相变压器大。因此,特高压电网遭受的地磁暴的侵害,更易产生较大的GIC-Q波动,是地磁暴灾害防御研究的重点。
[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.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM41

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