New improvements in accurate measurement of synchronously sampled AC signals

IMTC/2002. Proceedings of the 19th IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.00CH37276) Pub Date : 2002-08-07 DOI:10.1109/IMTC.2002.1007156

P. Petrović

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Abstract

A digital algorithm design approach, based on the use of a dual-slope ADC, is described in this paper. The main advantage of this approach is the determination of all electric values in an electric utility signal by the same algorithm. The algorithm has a high accuracy and regular structure. Measurements of voltage and current are made in successive periods by a stroboscopic technique (synchronous undersampling). The assumed stationarity of the electric utility signal is validated by measurements with an experimental set-up, consisting of a fast high precision sigma-delta ADC. The necessary synchronization is achieved by software measurements of the frequency of the measured signal. Assuming stationarity of the observed system (electric utility), in the stated one-second interval, it is proved that precise digital processing can be achieved without using a sample-and-hold circuit. The suggested measuring system was simulated, practically realized, and tested. Obtained results confirmed completely the starting postulates. Processing precision of 0.01% was achieved.

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同步采样交流信号精确测量的新改进

本文介绍了一种基于双斜率ADC的数字算法设计方法。这种方法的主要优点是用相同的算法确定电力公用事业信号中的所有电值。该算法具有精度高、结构规则等特点。电压和电流的测量通过频闪技术(同步欠采样)在连续的周期内进行。假设电力公用事业信号的平稳性通过实验装置的测量得到验证，该装置由快速高精度sigma-delta ADC组成。必要的同步是通过软件测量被测信号的频率来实现的。假设观测系统(电力效用)在规定的一秒间隔内平稳，证明了无需使用采样保持电路即可实现精确的数字处理。所提出的测量系统进行了仿真、实际实现和测试。所得结果完全证实了起始假设。加工精度达到0.01%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IMTC/2002. Proceedings of the 19th IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.00CH37276)

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