特高压干式平波电抗器磁场和电动力研究

发布时间：2018-05-03 02:23

本文选题：特高压干式平波电抗器 + 磁场　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：由于我国能源中心和经济中心的偏离,使得特高压直流输电技术被广泛应用。特高压干式平波电抗器是特高压直流输电工程中的重要设备,有平滑纹波,限制短路电流,防止换相失败等重要作用,在实际工程中有着广泛的应用。但是关于该种电抗器在各种工况下磁场和电动力的分布,以及电动力对绝缘层的影响还未见文献讨论。本文以向家坝-上海±800kV/4000A特高压直流输电工程中的一台特高压干式平波电抗器为研究对象,针对电抗器在正常运行时和短路时的不同情况,建立了不同的电路模型,准确计算了电抗器在稳态和暂态下的电流。在有限元分析软件ANSYS中建立了研究对象的磁场模型,详细计算了该情况下的磁场和电动力分布。为深入研究电抗器包封绝缘层在受到电动力之后的受力情况,在有限元结构分析软件SOLIDWORKS SIMULATION中建立了研究对象的有限元结构分析模型,得到了各层包封的形变和应力情况。以此为基础对其机械强度进行了校验并讨论了电抗器结构上的薄弱环节,给出了改进建议。计算的结果表明,由于在设计阶段没有足够的考虑短路时的暂态情况,故障电流在暂态过程中循环电流和电流集中问题十分严重。而电抗器由于其结构上的原因,磁感应强度分布有自内向外逐渐减小趋势,因此电流的分布应该从内向外逐渐缓慢增大。包封绝缘层的整体机械强度足够,可以承受各种工况下的电动力,但是局部电动力过大可能会引发撑条掉落,线圈绝缘层脱离等故障,需要采取措施提高其机械强度。
[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 卤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.
【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】：TM47

【参考文献】