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access icon free Local measurement-based technique for estimating fault location in multi-source DC microgrids

© The Institution of Engineering and Technology
Received 18/11/2017, Accepted 24/04/2018, Revised 27/03/2018, Published 27/04/2018

Quick fault detection and isolation of faulty section are desired in DC microgrid due to the presence of power electronic converters and low cable impedances. Owing to need of fast disconnection, limited time and data are available for online fault distance estimation. Some of the existing techniques consider source capacitors connected at only one end of the cable; therefore, assume that the fault current is contributed by only one end of the cable. This may not be true in the case of multi-source DC microgrids, where fault current would be supplied from both the ends. Further, existing communication-based techniques require either data synchronisation or fast communication network. To address these issues, this study proposes an online fault location method for multi-source DC microgrid without using communication. The mathematical model of faulted cable section connected to sources at both the ends is derived. This model is used along with the measurements to determine the fault distance. The model consistency with the measurements is quantified using the confidence level based on the residual analysis. A ring-type multi-source DC microgrid system is considered and simulated on real-time digital simulator to demonstrate the effectiveness of the proposed algorithm.

Inspec keywords: distributed power generation; telecommunication networks; power generation protection; synchronisation; power generation faults; fault currents; fault location; power system measurement

Other keywords: real-time digital simulator; power electronic converters; residual analysis; low cable impedances; fault current; model consistency; local measurement-based technique; fast communication network; online fault location method; confidence level; online fault distance estimation; ring-type multisource DC microgrid system; data synchronisation; faulted cable section; mathematical model; source capacitors; fault location estimation; fault detection and isolation; communication-based techniques

Subjects: Power system protection; Telecommunication applications; Distributed power generation; Power system measurement and metering

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