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Differential current-based fault protection with adaptive threshold for multiple PV-based DC microgrid

Differential current-based fault protection with adaptive threshold for multiple PV-based DC microgrid

Differential current-based fault protection with adaptive threshold for multiple PV-based DC microgrid

 

Abstract:

A new differential current-based fast fault detection and accurate fault distance calculation is proposed for photovoltaic (PV)-based DC microgrid. A multiterminal direct current (MTDC) distribution network is studied as an adequate solution for present low-voltage utility grid scenario, where local distributed generators (DGs) are incorporated primarily by
power electronics based DC–DC converters, DC–AC voltage-source converters (VSCs). PV and diesel generator (as auxiliary source) are considered for cascaded common DC bus, and AC utility bus integration is achieved by VSC unit for the proposed, MTDC network. DC microgrid protection is quite significant research focus due to the absence of well-defined standards. Poleto-pole, pole-to-ground, PV-side DC series and ground arc faults are basically considered as DC distribution network hazards. A discrete model differential current solution is considered to detect, classify and locate the faults by modified cumulative sum average approach. A comprehensive case study is presented with different DC loadings, to deliberate effectiveness of the proposed protection scheme in terms of percentage error and trip time (Ts). The result verification is conducted in MATLAB
environment as well as TMS320C6713 digital signal processor-based test bench with the proposed multiple DGs based DC microgrid.A new differential current-based fast detection and accurate fault location is proposed in this paper. The fault detection thresholds for various fault resistance are volatile in nature when primary distributed generators (DGs) are renewable.

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