控制合闸电压幅值的变压器励磁涌流抑制方案

发布时间：2018-04-22 14:28

本文选题：变压器空载合闸 + 励磁涌流抑制　；参考：《电力系统自动化》2017年08期

【摘要】：在分析变压器励磁涌流的影响因素和推导励磁涌流与各影响因素间数学关系的基础上,提出了一种基于合闸电压幅值控制的变压器励磁涌流抑制方案。该方案通过选择适当的合闸电压幅值控制曲线,对合闸电压的幅值进行控制,确保变压器空载合闸过程中产生的磁通不超过饱和磁通,从而达到抑制空载合闸励磁涌流的目的。根据磁通不等式约束与暂态磁通分量衰减规律给出了电压幅值控制函数,并推导了电压幅值控制函数中初值与变化斜率两个参数的上下限。采用PSCAD/EMTDC软件分别对单相和三相变压器不同状态下的空载合闸过程进行了仿真,并对磁通、励磁涌流、差动电流等参数进行了对比分析。仿真结果表明,通过控制合闸电压的幅值达到控制励磁电流大小的目的,能够将励磁涌流控制在数值较小的范围内,从而克服励磁涌流的影响。
[Abstract]:Based on the analysis of the influence factors of the inrush current of the transformer and the derivation of the mathematical relationship between the inrush current of the transformer and the factors affecting the inrush current, a scheme of restraining the inrush current of the transformer based on the amplitude control of the closing voltage is put forward. This scheme controls the amplitude of closing voltage by selecting proper control curve of closing voltage to ensure that the flux produced in the process of no-load switching of transformer does not exceed saturation flux, so as to restrain the inrush current of no-load closing excitation. According to the flux inequality constraint and the attenuation law of transient flux component, the voltage amplitude control function is given, and the upper and lower limits of the initial value and the varying slope of the voltage amplitude control function are derived. The no-load switching process of single-phase and three-phase transformers is simulated by PSCAD/EMTDC software, and the parameters such as magnetic flux, excitation inrush current and differential current are compared and analyzed. The simulation results show that the magnitude of excitation current can be controlled by controlling the amplitude of closing voltage, and the inrush current can be controlled in a small range, thus the influence of inrush current can be overcome.
【作者单位】：电网智能化调度与控制教育部重点实验室(山东大学);国网山东省电力公司检修公司;
【基金】：国家自然科学基金资助项目(51377100) 山东省自然科学基金资助项目(ZR2013EEM029)~~
【分类号】：TM41

【相似文献】