On the promise of the cancellation of secondary converter of the electronic transformer's output port,it is im?portant to analyze whether the merging units can overcome the influence of electromagnetic interference and output the data that meet the requirements of specifications. Based on the introduction of the calculation methods for the electronic transformer's amplitude error and phase error,some favorite data processing algorithms for the merging units are listed. The implementation process of triangular self-convolution window algorithm is analyzed,and the calculation method of the amplitude,frequency and initial phase angle with triangular self-convolution window is introduced. A kind of cali?bration equipment was designed based on LabVIEW. Various types of data processing algorithms for the merging units were tested at different signal-to-noise ratios to simulate the errors,and the test data were compared. The experimental results show that the software algorithms can remove the influence of electromagnetic interference on the merging units , thus the error in the data provided by the merging units was within a specified range.%本文旨在分析在取消电子式互感器出口二次转换器的前提下,合并单元能否克服电磁干扰的影响,输出符合规范要求的数据.在介绍电子式互感器的幅值及相位误差计算方法的基础上,列举了合并单元常用的几种数据处理算法.详细分析了三角自卷积窗算法的实现流程,并重点介绍了利用三角自卷积窗计算幅值、频率及初相角的方法.设计了一种基于LabVIEW的校验仪,模拟合并单元各类算法在不同信噪比条件下产生的误差,比较各算法的优劣.实验结果显示,合并单元可以通过软件算法消除电磁干扰的影响,提供误差范围符合规范要求的数据.
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