Abstract

Accurate fault location is crucial for finding and clearing faults in distribution networks. It can help to reduce the loss of power failure and ensure safe and stable operation. Without efficient observation points and the lack of phase angle information, traditional fault location methods of distribution networks usually have large errors. As the application of $\mu $ PMUs in the distribution network becomes more and more common, voltage and current waveforms, as well as phase angle can be recorded and provide more information for accurate fault location. In this paper, an intelligent location method is proposed to pinpoint the fault location based on the information of $\mu $ PMUs which are properly allocated. The fault section is firstly determined by comparing the zero-sequence current waveforms on both sides of the fault section. Then, a Stack Auto-Encoder (SAE) is modeled to provide an end-to-end solution to pinpoint fault point with the voltage and current phasors. Finally, the performance of the proposed method is tested by a simulated distribution network on the platform of PSCAD. The results show that the proposed method is effective in locating faults and can withstand the effects of transition resistance, fault type, and noise. Compared to another popular method, the proposed method shows better location accuracy.

Highlights

  • The distribution network connects power transmission network and power loads, and directly provides the power to users [1]

  • In order to improve the fault location accuracy in distribution networks, this paper proposes a location method based on μPMU measurements and stack auto-encoder (SAE)

  • SIMULATION RESULTS AND COMPARISONS To demonstrate the effectiveness of proposed method, a typical 10kV distribution network is modeled on the platform of PSCAD

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Summary

Introduction

The distribution network connects power transmission network and power loads, and directly provides the power to users [1]. In some countries such as China, distribution systems are ungrounded or grounded with Petersen coil. When a single-phase grounding fault occurs, the phase voltage of the faulted phase will drop and only a small fault current will be produced. As only current relays are installed in distribution networks, the fault features are not obvious, and the current relay does not operate immediately. Quick and reliable determination of the fault point is critical for the maintenance and operation of the distribution network

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