基于变压器励磁电流辨识的直流失稳与抑制策略  

DC Instability and Suppression Strategy of Transformer Based on Exciting-Current Identification

作　　者：潘超[1] 金明权 蔡国伟[1] 陈铁 Pan Chao;Jin Mingquan;Cai Guowei;Chen Tie(School of Electrical Engineering Northeast Electric Power University Jilin 132012 China;Harbin Power Supply Company of State Grid Heilongjiang Electric Power Supply Company Harbin 150000 China)

机构地区：[1]东北电力大学电气工程学院,吉林132012 [2]国网黑龙江省电力有限公司哈尔滨供电公司,哈尔滨150000

出　　处：《电工技术学报》2018年第18期4267-4276,共10页Transactions of China Electrotechnical Society

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

摘　　要：为进一步提高电力变压器抗直流扰动性能,针对电力变压器偏磁失稳问题开展其判别与抑制策略研究。根据变压器基本电磁机理构建直流扰动状态方程,利用端口电气信息研究变压器励磁电流参数的识别方法,并提出变压器在交直流混杂环境下的偏磁失稳判据。基于电路-磁场耦合模型仿真研究变压器在交直流混杂环境下的电磁特性,将励磁电流作为关键电磁参数反映变压器遭受(准)直流扰动时的异常,总结励磁电流在不同情况下的变化规律,通过分析不同偏磁失稳判据在(准)直流扰动下的适用性,研究基于励磁电流辨识的电力变压器交直流混杂异常判别方法。开展220V三相组式变压器交直流混杂实验验证该方法的正确性;结合现场10k V变压器试验分析其直流扰动励磁特性,进一步说明该文方法的有效性。最后,结合变压器直流扰动异常判别方法提出一种新型直流扰动抑制策略,仿真和实验结果验证了抑制策略的有效性。In order to further improve the anti-DC disturbance performance of power transformer,the discriminant and suppression strategy is studied aiming at the problem of biasing instability.The DC disturbance state equation is constructed though basic electromagnetic mechanism.The excitation current identification method is studied by using the port electrical information,and the biasing instability criterion is proposed.The electromagnetic characteristics are simulated based on the electromagnetic coupling model in AC/DC hybrid operation.The abnormality of the(quasi)DC disturbance is characterized by excitation current,and its variation rule is summarized.Anomaly discriminating method of DC-bias transformer is analyzed through the applicability of different biasing instability criteria.The DC disturbance experiment platform of 220V three-phase group transformer is used to verify the method’s correctness.The DC disturbance excitation characteristic of 10kV transformer is analyzed and the effectiveness of the method is further explained.Finally,a new DC disturbance suppression strategy is proposed by the DC disturbance abnormal discriminant method.The effectiveness of the suppression strategy is verified by simulation and experimental.

关 键 词：电力变压器 励磁电流 直流扰动 参数辨识 

分 类 号：TM41[电气工程—电器]