Abstract
To meet the requirements of quickness and accuracy for fault location in smart distribution networks with high penetration of distributed generations, we propose an integrated fault section location method based on multiple timescales. On the millisecond timescale, we present a distributed fault section location method based on fault current polarity value comparison (PVC) using the first half-cycle fault current signal after the fault inception. On the cycle timescale, we implement a distributed fault section location method based on fault current waveform similarity comparison (WSC) using the first one-cycle fault current signal after the fault inception. On the second timescale, we adopt a fault section location method based on a genetic algorithm (GA) using the steady-state fault current signal. Three timescale fault section location methods thus coordinate with each other through constructed reliability functions of the fault section location methods based on PVC and WSC. The simulation results show that the multi-timescale-based fault section location method achieves a fast and accurate fault section location.
Highlights
With growing concerns about environmental issues and a looming energy crisis, the world has entered the era of sustainable energy, which is based mainly on renewable energy [1], [2]
To meet the requirements of smart distribution networks for the rapidity of fault location, we proposed two fast distributed fault section location methods: the fault section location method based on fault current polarity value comparison (PVC) using the first half-cycle fault current signal and the fault section location method based on fault current waveform similarity comparison (WSC) using the first one-cycle fault current signal
We proposed the distributed fault section location method based on fault current PVC
Summary
With growing concerns about environmental issues and a looming energy crisis, the world has entered the era of sustainable energy, which is based mainly on renewable energy [1], [2]. Sun et al [23] proposed the fault section location based on FTU in the distribution network with DGs by means of time coordination between the current quick-break protection and the time-limited overcurrent protection set at the upstream and downstream measuring points of the DG This method needed to calculate only the amplitude of the fault currents, without distinguishing their directions, but the relay protection configuration was complex, the fault section location time was long, and the adaptability to various grid structures was poor, which could not meet the requirements of smart distribution networks. The method is implemented by SDUs through information interaction with their adjacent smart distribution terminals and only uses the first half-cycle fault current signal after the fault inception This fault section location method can provide ultrafast fault location.
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