考虑磁致伸效应的磁控饱和电抗器电磁振动研究

发布时间：2018-03-30 22:15

本文选题：磁控饱和电抗器　切入点：电磁振动　出处：《天津工业大学》2017年硕士论文

【摘要】：磁控饱和电抗器在电力系统中起到无功功率补偿的作用,但其运行时产生的振动噪声不仅给环境带来不利影响,还会损害电抗器本体性能,影响整个电网运行的稳定性和高效性。为了能有效的降低电抗器铁心产生的电磁振动噪声,本文从电抗器铁心产生电磁振动的根源对铁心振动噪声进行数值分析,即考虑叠片铁心磁致伸缩效应对其振动的影响。磁控饱和电抗器通过控制绕组调节其饱和程度,改变铁心磁导率实现电抗器无功功率的连续调节。但同时引入了偏磁问题,从而使电抗器振动加剧。所以,研究磁控饱和电抗器在不同饱和状态下考虑叠片铁心磁致伸缩效应引起的电磁振动具有重要的理论和现实意义。同时本文考虑了电工硅钢叠片的阻尼效应,分析了阻尼效应对电抗器振动的影响。本文主要研究内容如下:首先,为模拟不同饱和状态下磁控饱和电抗器铁心硅钢片的磁特性,本文考虑了直流磁通对磁化曲线的影响,采用德国BROCKHAUS公司的Epstein700和磁致伸缩测量系统MST500,获得了不同控制电流下的磁化特性曲线和磁致伸缩特性曲线,并将其处理成可用于数值计算的单值磁化特性曲线和磁致伸缩特性曲线。其次,基于麦克斯韦方程和弹性力学基本方程建立电抗器磁场和机械振动的数值分析模型。应用现有开源型多物理场耦合数值分析软件COMSOL Multiphysics,建立考虑叠片铁心磁致伸缩效应和阻尼效应的磁控饱和电抗器三维数值模型。阻尼效应是通过计算电抗器铁心的模态分布,确定阻尼耦合系数。然后将处理获得的单值磁化特性曲线和磁致伸缩特性曲线耦合到数值分析软件中。计算并分析不同控制电流下磁控饱和电抗器磁场、振动等信号的分布及大小。最后,对数值分析的4.4kVar/220V磁控饱和电抗器样机完成不同控制电流下电抗器振动实验,测量并分析不同控制电流下电抗器铁心特殊点的振动加速度大小,并与数值计算结果作对比分析。
[Abstract]:Magnetically controlled saturated reactor plays the function of the reactive power compensation in power system, but the vibration and noise when running, not only to the environment adversely affected, but also damage the reactor performance and stability of the power grid operation and high efficiency. In order to electromagnetic vibration and noise reduction reactor core effectively, the root the electromagnetic vibration from the reactor core to the core vibration noise is analyzed, which consider the effect of laminated core magnetostrictive effect on its vibration. The magnetically controlled saturated reactor by controlling the saturation degree of the regulating winding, continuously adjusting the permeability of core is changed to achieve reactive power reactor. But at the same time introduce bias, so that the vibration of the reactor intensified. Therefore, research on magnetically controlled saturated reactor under different saturated condition considering the electromagnetic vibration caused by laminated core magnetostrictive effect dynamic It has important theoretical and practical significance. At the same time considering the damping effect of silicon steel laminations, analyzes the influence of vibration damping effect on the reactor. The main research contents of this paper are as follows: firstly, to simulate different saturated magnetic properties of magnetically controlled saturated reactor core silicon steel sheet, considering the effect of DC magnetic flux on the magnetization curve using MST500, Epstein700 and magnetostriction measurement system of BROCKHAUS company of Germany, the magnetization curve and the magnetostrictive characteristic curve under different control current, and it can be used for processing into the number value of single valued magnetization characteristic curve and magnetostriction curve calculation. Secondly, the numerical analysis model of magnetic field and mechanical vibration to establish basic reactor the Maxwell equation and elastic mechanics. Based on the Multiphysics numerical analysis software COMSOL multiphysics coupling application of the existing open type A magnetron, a laminated core magnetostrictive effect and the damping effect of the saturable reactor is a three-dimensional numerical model considered. Damping effect is through the modal distribution calculation of reactor core, determine the damping coupling coefficient. Then single values obtained magnetization curve and magnetostrictive characteristic curve coupled to numerical analysis software. The analysis of different current control magnetically controlled saturated reactor and calculation of magnetic field, the distribution and magnitude of vibration signal. Finally, the numerical analysis of the 4.4kVar/220V reactor vibration experiment of magnetically controlled saturated reactor prototype under different control current, analysis of vibration acceleration of different sizes under the control of current reactor core special points and measure, and the calculation results are compared with numerical analysis.

【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM47

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