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Application of the Automatic Segmented Hilbert Huang Transform Method for the Evaluation of the Single-Event Characteristics of Voltage Sags in Power Systems
IEEE Transactions on Industry Applications ( IF 4.4 ) Pub Date : 2021-01-15 , DOI: 10.1109/tia.2021.3052156
Sumaiya Hasan , Kashem M. Muttaqi , Danny Sutanto

Depending on the type of the electrical network, the source of the voltage sag (or dip), and the settings of the protective devices, the magnitude, duration, and phase of the voltage sag (or dip) during an event may behave differently. Because of the nonstationary characteristics of the voltage sag, the conventional fast Fourier transform (FFT) and Hilbert Huang transform (HHT) methods show ambiguities at the starting and at the recovery points of the voltage sag waveform. This can lead to errors in the calculation of the single-event characteristics (SEC) of the voltage sag. This article investigates the application of a novel automatic segmented HHT (SHHT) method for evaluating the SEC of the voltage sag caused by different types of symmetrical and unsymmetrical faults in both transmission and distribution networks. It also investigates the influence of several factors on the three important parameters of the voltage sag—the magnitude, the phase angle, and the point-on-wave (POW) of the voltage sag waveform. These factors include the types of fault, the location of the fault, and the X/R ratio of the lines before and after the fault, the transformer and load connections, and the POW of the sag initiation. The simulation results and tests with real data validate the effectiveness of the SHHT method in the evaluation of the SEC of the voltage sag when compared with those obtained using the traditional FFT and the analytical method.

中文翻译:

自动分段Hilbert Huang变换方法在电力系统电压暂降单事件特性评估中的应用

根据电网的类型,电压骤降(或骤降)的来源以及保护设备的设置,事件期间电压骤降(或骤降)的大小,持续时间和相位可能会有所不同。由于电压骤降的非平稳特性,常规的快速傅里叶变换(FFT)和希尔伯特·黄变换(HHT)方法在电压骤降波形的起始点和恢复点显示出歧义。这可能会导致电压骤降的单事件特征(SEC)的计算错误。本文研究了一种新颖的自动分段HHT(SHHT)方法在评估输电和配电网络中由不同类型的对称和非对称故障引起的电压骤降的SEC中的应用。它还研究了几个因素对电压骤降的三个重要参数的影响-电压骤降波形的幅度,相位角和波上点(POW)。这些因素包括故障类型,故障位置以及故障前后线路的X / R比,变压器和负载连接以及下垂引发的POW。与使用传统FFT和分析方法获得的结果相比,仿真结果和实际数据测试证明了SHHT方法在评估电压骤降的SEC方面的有效性。故障前后线路的X / R比,变压器和负载连接以及下垂引发的POW。与使用传统FFT和分析方法获得的结果相比,仿真结果和实际数据测试证明了SHHT方法在评估电压骤降的SEC方面的有效性。故障前后线路的X / R比,变压器和负载连接以及下垂引发的POW。与使用传统FFT和分析方法获得的结果相比,仿真结果和实际数据测试证明了SHHT方法在评估电压骤降的SEC方面的有效性。
更新日期:2021-03-19
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