摘要
为了深入研究500 kV电力变压器的直流偏磁耐受性能,根据J-A磁滞回线理论,基于电路磁路模型建立了500 kV自耦变压器的直流偏磁仿真模型,通过改变J-A模型中的关键参数,仿真研究了矫顽力、剩磁和磁滞损耗等硅钢片磁化特性对500 kV变压器直流偏磁耐受性能的影响。仿真结果表明,变压器直流偏磁时,励磁电流出现畸变,有偶次谐波出现,励磁电流随直流分量的增大呈现不同的增幅。当磁滞回线的矫顽力增大时,励磁电流及其总谐波畸变率随外加直流分量的增幅变小。当剩磁和磁滞损耗增大时,励磁电流及其总谐波畸变率随外加直流分量的增幅加剧。研究结果可为大型变压器直流偏磁耐受能力评估及直流偏磁抑制措施提供理论依据和新思路,具有一定的实用价值。
In order to further study the DC bias enduring ability of 500 kV power transformer, DC bias simulation model of 500 kV auto-transformer is built based on the electric circuit and magnetic circuit combined model according to the J-A hysteresis loop theory. The effects of magnetizing property of silicon steel sheet including coercive force, remanence, hysteresis loss to the enduring ability of 500 kV power transformer are simulated through the variations of key parameters in J-A model. It is seen that the magnetic currents are distorted with the occurrence of even harmonics when the DC component enters into the power transformer. The magnetizing currents are increased with different amplitudes with the increasing of DC component. When the coercive force of hysteresis loop is increased, the variations of magnetic currents and its total harmonics distortion are increased gradually. When remanence and hysteresis loss are increased, the variations of magnetic currents and its total harmonics distortion are increased greatly. The obtained results could provide theoretical references and new thoughts for the improvement of DC bias enduring ability of power transformer and suppression measure of DC bias with certain practical value. This work is supported by National Natural Science Foundation of China （No. 51207090）.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2014年第14期60-66,共7页
Power System Protection and Control
基金
国家自然科学基金(51207090)~~
