中国电力2025，Vol.58Issue(2)：9-21,13.DOI:10.11930/j.issn.1004-9649.202401014
基于电流合成矢量轨迹特性的双馈风电场主变压器差动保护
Differential Protection of Main Transformer of Doubly-Fed Wind Farm Based on Current Synthesized Vector Trajectory Characteristics
摘要
Abstract
During the fault ride-through process of the doubly-fed wind farms,the short-circuit current provided by the wind farm side exhibits frequency deviation,which leads to errors in the Fourier algorithm based phasor extraction.Additionally,the second harmonic restraint element may act incorrectly,leading to longterm blockage of the differential protection.This paper proposes a novel time-domain protection scheme based on the characteristics of the current synthesis vector trajectory.Based on the intrinsic differences between internal faults and external faults of transformers,two current synthesis vectors are constructed accordingly,and corresponding protection schemes are designed according to the trajectory characteristics of each synthesis vector.A simulation model of the control and protection of the delivery system of doubly-fed wind farms is constructed in PSCAD/EMTDC.Experimental results show that the proposed scheme can identify various internal faults and is not affected by the interference of magnetizing inrush current,current transformer(CT)saturation accompanying external faults and CT measurement errors accompanying external faults.The proposed scheme can operate in 15ms at the fastest and the average operation time is less than a fundamental frequency cycle.关键词
双馈风电场/主变压器保护/合成矢量/励磁涌流/电流互感器饱和Key words
doubly-fed wind farm/main transformer protection/synthesized vector/inrush current/current transformer saturation引用本文复制引用
宋许鹏,杨小洋,樊征臻..基于电流合成矢量轨迹特性的双馈风电场主变压器差动保护[J].中国电力,2025,58(2):9-21,13.基金项目
中央高校基本科研业务费重点领域交叉创新项目(2022JCCXJD01). This work is supported by Interdisciplinary Innovation Project in Key Areas of the Fundamental Research Funds for the Central Universities(No.2022JCCXJD01). （2022JCCXJD01）
