Abstract
In modern electrical power distribution systems, the effective operation of inverter-based arc suppression devices relies on the accuracy of faulty phase selection. In the traditional methods of faulty phase selection for single-phase-to-ground faults (SPGs), power frequency-based amplitude and phase characteristics are used to identify the faulty phase. In the field, when a high-resistance SPG occurs in the system, traditional methods are difficult for accurately identifying the faulty phase because of the weak fault components and complicated process. A novel realizable and effective method of faulty phase selection based on transient current similarity measurements is presented when SPGs occur in resonantly grounded distribution systems in this paper. An optimized Hausdorff distance matrix (MOHD) is proposed and constructed by the transient currents of three phases’ similarity measurements within a certain time window of our method. This MOHD is used to select the sampling time window adaptively, which allows the proposed method to be applied to any scale of distribution systems. Firstly, when a SPG occurs, the expressions for the transient phase current mutation in the faulty and sound phases are analyzed. Then, the sampling process is segmented into several selection units (SUs) to form the MOHD-based faulty phase selection method. Additionally, the Hausdorff distance algorithm (HD) is used to calculate the waveform similarities of the transient phase current mutation among the three phases to form the HD-based faulty phase selection method. Finally, a practical resonant grounded distribution system is modeled in PSCAD/EMTDC, and the effectiveness and performance of the proposed method is compared and verified under different fault resistances, fault inception angles, system topologies, sampling time windows and rates of data missing.
Highlights
Arc suppression coils have been widely used in power distribution systems in China and Europe [1,2]
The results show that the faulty phase selection method based on the transient current similarity measurements is not affected by the fault inception angle
When a high-resistance single-phase-to-ground faults (SPGs) occurs in a distribution system, the steady-state components of the fault signals are too weak to be used for faulty phase selection
Summary
Arc suppression coils have been widely used in power distribution systems in China and Europe [1,2]. When a single-phase-to-ground fault (SPG) occurs in the distribution network, the arc suppression device will compensate the fault current and prevent the fault arc from reigniting [3,4]. In the case of high-resistance ground faults, the phase with the lowest phase voltage is no longer the faulty phase To solve this problem, another power frequency-based faulty phase selection method is proposed by some scholars. To avoid the complicated selection process, Wang et al [12] determined the faulty phase based on the phase voltage variation after the injection of a compensation current at the neutral point in a distribution system with fully compensated arc suppression technology, while Fan et al [13] proposed a faulty phase recognition method based on phase-to-ground voltage variations, who analyzed the effects of system asymmetry and fault resistance in ungrounded distribution systems. The application of these methods is susceptible to interference from factors such as fault resistance values, system grounding methods and system asymmetries
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