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首页> 外文期刊>Industrial Informatics, IEEE Transactions on >Time- and Frequency-Domain Fault Detection in a VSC-Interfaced Experimental DC Test System
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Time- and Frequency-Domain Fault Detection in a VSC-Interfaced Experimental DC Test System

机译：VSC接口的实验直流测试系统中的时域和频域故障检测

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摘要

The rapid discharge of a dc-link capacitor of the voltage-source converter (VSC)-based dc system is the primary indication of the fault condition. Apart from the time-domain analysis, frequency-domain analysis of the fault current could also be utilized for dc fault detection, as the rapidly rising fault current is expected to have high-frequency components. This paper proposes two fault detection methods and compares their performances with the wavelet transform. The first method is the time-domain analysis of the dc-link capacitor discharge and is termed as the capacitive discharge technique. The relationship between the dc line current and the behavior of the dc-link capacitor is measured in terms of a correlation coefficient, whose value can be used to establish a fault basis. The second method is the frequency-domain-based short-time Fourier transform, which is used for quantitative analysis of high-frequency components in the fault current. These methods are extensively analyzed and compared using a scaled-down VSC-based dc system experimental test setup. Comparison has been done based on fault detection time, sensitivity to fault parameters, influence of sampling frequency, and computation speed. Furthermore, the selectivity of the fault detection methods is studied on the multiterminal dc systems of two different topologies (ring and radial), modeled in PSCAD/EMTDC. The experimental and simulation results substantiate the applicability of all the methods to the dc system. Brief comparative analysis with the di/dt method is also presented to highlight the advantages of the proposed methods.
机译：基于电压源转换器（VSC）的直流系统的直流链路电容器的快速放电是故障状况的主要指示。除了时域分析之外，故障电流的频域分析还可以用于直流故障检测，因为快速上升的故障电流有望具有高频成分。本文提出了两种故障检测方法，并将其性能与小波变换进行了比较。第一种方法是直流环节电容器放电的时域分析，被称为电容放电技术。直流线路电流与直流链路电容器性能之间的关系根据相关系数进行测量，该系数的值可用于建立故障基础。第二种方法是基于频域的短时傅立叶变换，用于定量分析故障电流中的高频分量。使用按比例缩小的基于VSC的直流系统实验测试设置对这些方法进行了广泛的分析和比较。根据故障检测时间，对故障参数的敏感性，采样频率的影响和计算速度进行了比较。此外，在PSCAD / EMTDC中建模的两种不同拓扑（环形和径向）的多端子dc系统上研究了故障检测方法的选择性。实验和仿真结果证实了所有方法在直流系统中的适用性。还介绍了使用di / dt方法进行的简要比较分析，以突出提出的方法的优点。

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