基于漏感辨识的变压器交直流混合运行保护方法

2018年2月电工技术学报Vol.33 No. 4 第33卷第4期TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Feb. 2018

DOI: 10.19595/https://www.wendangku.net/doc/278883667.html,ki.1000-6753.tces.161385

基于漏感辨识的变压器交直流混合运行

保护方法

潘超1金明权1蔡国伟1赵春芳2

（1. 东北电力大学电气工程学院吉林 132012

2. 沈阳工业大学电气工程学院沈阳 110870）

摘要基于变压器直流偏磁电磁耦合机理研究其保护策略，建立直流扰动下变压器回路方程，根据端口量测信息时域差分原理研究变压器动态漏电感参数辨识方法，并在此基础上提出变压器在直流扰动下的保护判据。利用时域场路耦合方法模拟分析不同条件下变压器运行的电磁特性，利用关键电磁参数表征变压器直流偏磁异常现象，归纳励磁电流、动态电感以及动态漏电感在直流偏磁时的波动情况，并总结其变化规律。通过搭建动模试验平台，研究不同判据在直流扰动下的适用性，提出一种基于单侧漏感参数辨识的变压器直流扰动保护原理，仿真分析和动模试验验证了该保护方法的准确性和可行性。

关键词：变压器保护直流扰动动态电感时域差分

中图分类号：TM41; TM403.5

Protection for Transformer in AC-DC Hybrid Operation Mode

Based on Leakage Inductance Identification

Pan Chao1 Jin Mingquan1 Cai Guowei1 Zhao Chunfang2

（1. School of Electrical Engineering Northeast Electrical Power University Jilin 132012 China

2. School of Electrical Engineering Shenyang University of Technology Shenyang 110870 China）

Abstract In this paper, the protection strategy is researched based on electromagnetic coupling mechanism for DC-biased transformer. The circuit equation of transformer is established with DC disturbance. Combined with the time-domain difference principle of port-measured information, the identification method of dynamic leakage inductance is studied. On this basis, the protection criterion is proposed considering the DC disturbance. By using time-domain field-circuit coupling method, the electromagnetic characteristics of transformer are analyzed under different operation situations. The abnormal features of the DC-biased transformer are characterized by the key electromagnetic parameters such as exciting current, dynamic inductance and leakage inductance. Then the fluctuations of the key parameters are summarized, and the changing regulation is hence concluded. With dynamic model test platform set, the applicability of different criteria is studied under different DC levels. The DC-disturbance protection principle of transformer is presented based on the single-side leakage inductance parameter identification. The accuracy and feasibility of the proposed method is verified by simulation analysis and dynamic model experiment.

Keywords：Transformer protection, DC disturbance, dynamic inductance, time-domain difference

国家自然科学基金（51507027）和吉林科技创新发展计划（20166014）资助项目。

收稿日期 2016-08-24 改稿日期 2017-01-08