Abstract

In this work, a digital fault locator has been designed using Arduino for bipolar VSC–HVDC transmission lines based on the ratio of voltage to current signals from source end. Current and voltage signals of only rectifier end have been processed with discrete wavelet transform using DB-4 as the mother wavelet. After the signals are decomposed using wavelet up to level 4, approximate coefficients are taken. Standard deviation is then calculated and given as input to the fault locator designed in Arduino. Fault location logic has been designed in Arduino using the input features. Various fault cases are tested using proposed fault locator to check the effectiveness of the method. Percentage error in fault location estimation is within 1%. Some of the advantages of the proposed digital fault locator are no requirement of communication link, reaches setting is up to 99.8% of line length, percentage error is within 1%, and lower implementation cost. Hence the proposed digital fault locator can be implemented is a real power system effectively.

摘要

在这项工作中，基于来自源端的电压与电流信号之比，使用Arduino为双极VSC–HVDC传输线设计了一个数字故障定位器。使用DB-4作为母小波，通过离散小波变换对仅整流器端的电流和电压信号进行了处理。在使用小波将信号分解到第4级之后，将获得近似系数。然后计算标准偏差，并将其作为Arduino设计的故障定位器的输入。故障定位逻辑已在Arduino中使用输入功能进行了设计。使用建议的故障定位器测试了各种故障案例，以检验该方法的有效性。故障位置估计中的百分比误差在1％以内。提出的数字故障定位器的一些优点是不需要通信链接，达到设定值时，线长可达99.8％，百分比误差在1％以内，并且实现成本较低。因此，所提出的数字式故障定位仪可以有效地实现在实际的电力系统中。