变压器直流扰动下励磁谐波与铁心饱和失稳研究  

Research on excitation harmonics and core saturation instability of transformer under DC disturbance

作　　者：王格万 潘超[1] 郑迤丹 刘东洋[3] 崔迪[3] 冯超[3] 王佳欣 WANG Gewan;PAN Chao;ZHENG Yidan;LIU Dongyang;CUI Di;FENG Chao;WANG Jiaxin(Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,China;Maintenance Branch,State Grid Liaoning Electric Power Company,Shenyang 110003,China;Harbin Power Vocation Technology College,Harbin 150030,China;Datang Renewable Power Heilongjiang Company,Harbin 150038,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012 [2]国网辽宁省电力有限公司检修分公司,辽宁沈阳110003 [3]哈尔滨电力职业技术学院,黑龙江哈尔滨150030 [4]大唐新能源黑龙江公司,黑龙江哈尔滨150038

出　　处：《电力系统保护与控制》2019年第9期49-55,共7页Power System Protection and Control

基　　金：国家自然科学基金项目(51507027);吉林科技创新发展计划项目(20166014)~~

摘　　要：变压器遭受直流入侵时铁心励磁饱和程度加深,励磁电流发生畸变,谐波含量显著升高。针对该问题研究变压器励磁谐波与铁心饱和特性,并提出一种变压器直流扰动下铁心饱和失稳判据。基于电磁耦合原理构建交直流混杂模式下的变压器状态方程,利用端口电气信息研究励磁电流辨识方法,对励磁电流进行谐波分析并总结其变化规律,通过分析变压器直流扰动铁心饱和机理,研究铁心饱和失稳判别方法。通过仿真计算与动模实验深入分析变压器的电磁特性,并验证该方法的有效性。该研究为变压器直流扰动下铁心饱和失稳判别提供可行方法。Excitation saturation of core is deepened when the transformer is subjected to DC invasion,which causes excitation current to distort and harmonic components are increasing significantly.In this paper,the characteristics of excitation harmonic and core saturation are studied,and a criterion for core saturation instability of the transformer DC disturbance is proposed.Based on the principle of electromagnetic coupling,the state equation of transformer in AC/DC hybrid mode is constructed,then the identification method of excitation current is studied based on port electrical information.The harmonic of excitation current is analyzed and its variation law is summarized,furthermore,the discriminating method of core saturation instability is studied by analyzing the saturation mechanism of the transformer under DC disturbance.The electromagnetic characteristics of transformer are analyzed through calculation and dynamic simulation experiment and the effectiveness of this method is verified,which provides a feasible method for discriminating the saturation instability of core under DC disturbance.

关 键 词：直流扰动 励磁谐波 参数辨识 失稳判据 

分 类 号：TM41[电气工程—电器]