Single-Ended Protection Scheme for VSC-Based DC Microgrid Lines

Abstract

Abstract:With the promotion of distributed energy and direct current (DC) loads, the DC microgrid is able to provide a higher power quality and improve the grid efficiency. Various technical issues in DC microgrids are still to be addressed, particularly a proper protection scheme for fault detection and isolation in DC microgrids utilizing voltage source converters (VSCs). In this paper, the pole-to-pole DC fault transient behavior of the VSC-based microgrids is firstly analyzed with four successive stages, and then the exact requirements for protections are presented. Furthermore, a novel single-ended protection scheme based on local transient signals is proposed, which needs no data transmission or synchronization between two ends, ensuring the speed. A four-terminal DC microgrid model was built in PSCAD/EMTDC. Numerous simulations have demonstrated the validity of the proposed scheme.

A comprehensive review of distribution generation integratedDCmicrogrid protection: issues, strategies, and future direction

“…Further, in Reference 113, the authors have proposed a scheme to detect the DC faults by using the complex wavelet coefficient of transient currents. A protection scheme for low inertia systems based on the assessment of pole to pole characteristics is suggested in Reference 114. The fault analysis of the VSC is done by examining the transient signal as a second‐order differential equation and evaluating the pole‐pole fault waveform for different stages.…”

Integrated Control and Protection Architecture for Islanded PV-Battery DC Microgrids: Design, Analysis and Experimental Verification

“…Dc microgrids possess plenty of merits compared to classical ac ones. Lower converter requirements, a higher transmission capacity, higher power quality, power transmission loss reductions and a negligible skin effect represent the merits of the dc microgrids over ac networks [3][4][5][6][7][8][9]. Despite their remarkable merits, dc microgrid protection poses many challenges [7][8][9][10][11][12].…”

“…Lower converter requirements, a higher transmission capacity, higher power quality, power transmission loss reductions and a negligible skin effect represent the merits of the dc microgrids over ac networks [3][4][5][6][7][8][9]. Despite their remarkable merits, dc microgrid protection poses many challenges [7][8][9][10][11][12]. Familiarity with fault detection in microgrids allows for quick restoration, maintenance and decreases in unnecessary power outage periods [6][7][8][9][10].…”

“…Despite their remarkable merits, dc microgrid protection poses many challenges [7][8][9][10][11][12]. Familiarity with fault detection in microgrids allows for quick restoration, maintenance and decreases in unnecessary power outage periods [6][7][8][9][10]. In [10], a multi-layer perceptron neural network-based fault location technique has been proposed for a loop-type dc microgrid system.…”