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巨磁阻传感器输出非线性与温漂的补偿 被引量:5

Compensation of Nonlinearity and Temperature Drift for Giant Magnetic Resistance Current Sensor
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摘要 采用巨磁阻(GMR)传感器可无接触测量直流大电流,可避免高压直流输电系统中高压直流电流传感器的热耗问题,并提高整个测量系统的稳定性。为同时对GMR传感器进行非线性补偿与温漂补偿以提高其测量精度和稳定性,提出了基于最小二乘支持向量机(LSSVM)与粒子群参数优化相结合的多传感器信息融合算法。使用LSSVM方法重构GMR传感器的传输特性,最后利用粒子群算法优化LSSVM的参数,得到GMR传感器传输特性的重构公式,用于对被测电流进行估算。采用温度传感器PT1000实时监测1台GMR传感器的温度,对该GMR传感器进行了标定实验和分析,结果表明:在-40~40°C的温度变化范围内,经重构的GMR传感器最大可测量电流为1 500A,且输出准确度明显提高,平均补偿误差〈1.5%,能够满足一般高压直流电流的测量要求。 By using giant magnetic resistance(GMR) current sensors,large direct current could be measured without contact between sensors and conductors,which could help avoid heat loss problem of high voltage DC sensors and improve the whole measurement system of HVDC transmission system.In order to realize both compensations of nonlinearity and temperature drift for GMR sensor,and to improve the sensor’s accuracy and stability,we proposed a multi-sensor information fusion algorithm based on the combination of least squares support vector machine(LSSVM) algorithm and particle swarm evolutionary computation.The LSSVM algorithm was used to reconstruct the transmission characteristics of GMR sensor.Then we optimized the parameters of LSSVM and obtained the transmission formula of GMR sensor using the particle swarm evolutionary computation.Finally,we could estimate the measured current according to the obtained formula.Using a PT1000 sensor to monitor the temperature of a GMR sensor,we performed calibration experiments on the GMR sensor.Experimental results show that,within a temperature range of-40~40°C,the reconstructed GMR sensor has the maximum measurable current of 1 500 A,with an obviously improved accuracy,i.e.,the mean compensation error is less than 1.5%.Thus,the proposed reconstructed GMR sensor can meet the requirements of general HVDC measurement.
作者 辛守乔 肖立业 马玉鹏 XIN Shouqiao1,2,XIAO Liye1,MA Yupeng3(1.Institute of Electrical Engineering,Chinese Academy of Science,Beijing 100190,China; 2.Graduate School of Chinese Academy of Science,Beijing 100039,China; 3.Jilin Electric Power Company Limited,Changchun 130000,China)
出处 《高电压技术》 EI CAS CSCD 北大核心 2013年第5期1178-1183,共6页 High Voltage Engineering
关键词 巨磁阻 高压 直流电流 非线性 支持向量机 粒子群 特性重构 giant magnetic resistance high voltage direct current nonlinearity support vector particle swarm character reconstruction
作者简介 辛守乔1980-,男,博士主要研究方向为电力系统的状态检测及智能电器设备的设计开发
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