Rogowski线圈数字积分器的直流误差消除方法研究
发布时间:2019-01-21 12:43
【摘要】:积分器是Rogowski线圈电子式电流互感器的重要组成部分,而积分器的精度受放大采样模拟电路中产生的直流误差的影响。文章对几种常用的直流误差消除方法进行分析,提出了一种镜像法,用一对参数相同的装置对一对等幅反相的信号进行采样从而对直流误差进行补偿。软件仿真和硬件测试的结果表明该方法在包含次谐波的电流和故障暂态电流的测量中,仅消除了模拟电路中的直流误差而最大程度地保证了被积信号的完整性,从而达到更高的积分精度。
[Abstract]:Integrator is an important part of Rogowski coil electronic current transformer, and the accuracy of integrator is affected by DC error produced in amplifier sampling analog circuit. In this paper, several commonly used methods for eliminating DC errors are analyzed, and a mirror image method is proposed, in which a pair of equal-amplitude inverse phase signals are sampled by a pair of devices with the same parameters to compensate for DC errors. The results of software simulation and hardware test show that the method can only eliminate the DC error in analog circuit and ensure the integrity of the integrated signal to the maximum extent in the measurement of current and fault transient current containing subharmonics. In order to achieve higher integration accuracy.
【作者单位】: 华中科技大学电气与电子工程学院;
【分类号】:TM452
本文编号:2412673
[Abstract]:Integrator is an important part of Rogowski coil electronic current transformer, and the accuracy of integrator is affected by DC error produced in amplifier sampling analog circuit. In this paper, several commonly used methods for eliminating DC errors are analyzed, and a mirror image method is proposed, in which a pair of equal-amplitude inverse phase signals are sampled by a pair of devices with the same parameters to compensate for DC errors. The results of software simulation and hardware test show that the method can only eliminate the DC error in analog circuit and ensure the integrity of the integrated signal to the maximum extent in the measurement of current and fault transient current containing subharmonics. In order to achieve higher integration accuracy.
【作者单位】: 华中科技大学电气与电子工程学院;
【分类号】:TM452
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