电流互感器饱和误差二次补偿方法研究  

Research on Secondary Compensation Method of Current Transformer Saturation Error

作　　者：陶雄武 周俊宏 陈德权 陈义 刘利林 TAO Xiongwu;ZHOU Junhong;CHEN Dequan;CHEN Yi;LIU Lilin(Huizhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Huizhou 516000,China;Energy Development Research Institute,CSG,Guangzhou 510000,China)

机构地区：[1]广东电网有限责任公司惠州供电局,广东惠州516000 [2]南方电网能源发展研究院有限责任公司,广东广州510000

出　　处：《自动化仪表》2025年第4期12-16,共5页Process Automation Instrumentation

基　　金：南方电网公司广东电网有限责任公司基建技术创新专题基金资助项目(0313002022030103XG00002)。

摘　　要：谐波电流会导致电流互感器出现饱和误差,影响继电保护正常运行。为此,研究了电流互感器饱和误差二次补偿方法。利用第一次闭环反馈控制电流互感器测量范围,实现误差补偿。利用第二次闭环反馈消除相位差干扰,进一步修正测量误差。通过修正复位高度处理原边电流,以提高电流测量精度。针对修正复位高度值后尾端励磁测量电流仍存在饱和误差的问题,创新性地将复位高度修正值和磁通增量的尾端励磁电流值作为网络输入,利用神经网络的最优参数来自动控制电流互感器饱和误差的补偿。测试结果证明:所提方法的补偿精度不受电流互感器负载特性的影响;补偿后二次电流值与理想值非常接近。该方法的误差低于0.021 A、运行时间低于0.24 s,因而补偿效率较高。该方法能够保证继电保护正常运行。Harmonic current can lead to saturation error of current transformer,which affects the normal operation of relay protection.For this reason,the current transformer saturation error secondary compensation method is researched.The first closed-loop feedback is used to control the current transformer measurement range,to realize the error compensation.The second closed-loop feedback is used to eliminate the phase difference interference and further correct the measurement error.By correcting the reset height,the primary side current is processed to improve the current measurement accuracy.For the problem that the saturation error still exists in the tail-end excitation measurement current after the correction of the reset height value,the reset height correction value and the tail-end excitation current value of the flux increment are innovatively used as the network inputs,and the optimal parameters of the neural network are utilized to automatically control the compensation of the saturation error of the current transformer.The test results prove that the compensation accuracy of the proposed method is not affected by the load characteristics of the current transformer,and the secondary current value after compensation is very close to the ideal value.The error of the method is less than 0.021 A,and the running time is less than 0.24 s,so the compensation efficiency is higher.The method can ensure the normal operation of relay protection.

关 键 词：电流互感器 闭环算法 神经网络模型 饱和补偿控制 法拉第相位效应 相位调制器 

分 类 号：TH-39[机械工程]