基于Levenberg-Marquardt算法的电力变压器油中溶解气体标定方法.doc

一种电力变压器油中溶解气体的标定新方法 魏云冰1,2，王东晖1，邵秋华3，王胜辉3 (1. 郑州轻工业学院 电气信息工程学院，郑州 450002; 2. , M13 9PL; 3. 许继集团有限公司，河南 许昌 461000) 摘要：油中溶解气体的准确标定是电力变压器在线监测与故障诊断的前提。当前的油中溶解气体标定主要采用分段折线拟合方法，存在着分段拐点处光滑性不足、可重复性较差以及整体拟合精度低等问题。针对这些问题，提出了基于Levenberg-Marquardt (LM) 算法的油中溶解气体标定方法，通过建立电力变压器油中溶解气体在线监测系统，采集了H2、CH4、C2H6、C2H4和C2H2等5种主要气体的实验数据，结合这5种气体的不同传感特性，应用LM算法对其进行拟合，实现了这5种油中气体的有效标定。实验结果表明，该方法克服了传统方法的不足，且拟合精度完全符合国家电网相关标准的要求。 关键词：Levenberg-Marquardt算法；油中溶解气体；拟合精度；标定 中图分类号：TM411 文献标识码：B 文章编号：1001-1390（2015）00-0000-00 A new calibration method for dissolved gases in power transformer based on levenberg – marquardt algorithm Wei Yunbing1, 2, Wang Donghui1, Shao Qiuhua3, Wang Shenghui3 (1. School of Electrical Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China. 2. School of Electrical Electronic Engineering, University of Manchester, Manchester M13 9PL, UK. 3. XJ Group Corporation, Xuchang 461000, Henan, China) Abstract: Accurate calibration of dissolved gas analysis (DGA) is a prerequisie for on-line monitoring and fault diagnosis of power transformer. The traditional calibration method used for determining the calibration curves of gas dissolved in transformer oil is the segmented polyline method, but its smoothness, repeatability and overall fitting accuracy are not satisfactory. In order to solve these problems effectively, a novel calibration method for the gas dissolved in transformer oil based on Levenberg - Marquardt algorithm is proposed in this paper. Through establishing the gas dissolved in oil monitoring system, the data from five kinds of oil gases: H2, CH4, C2H6, C2H4 and C2H2 are collected and the proposed algorithm LM is applied effectively in curve fitting of calibration curves on these five kinds of gases. The experimental results show that this method can overcome the deficiencies of the traditional method and the fitting accuracy meets the requirements of State Grid’s standards very well. Keywords: Levenberg-Marqua