Microgrid protection based on principle of fault location

Abstract

Island‐capable microgrids can potentially enhance the efficiency of distributed generations. In general, protection schemes in traditional distribution network cannot meet the requirements of microgrid internal protection. In order to solve the problem, this paper proposes the positive‐sequence fault component of current as the starting criterion. And a graph model describing the overall structure of a microgrid is established. The information about fault currents, including amplitude and direction, is acquired to locate fault branch. Furthermore, a new matrix algorithm is used to locate the fault point, so that the fault can be isolated. Finally, a microgrid model is simulated in the PSCAD/EMTDC software environment to illustrate the validity of fault location principle in microgrid protection. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Data‐driven short‐circuit detection and location in microgrids using micro‐synchrophasors

“…From expression (21), H 3 is directly related to the fault current multiplied by a factor that reflects the fault position along the line. Therefore, the distance is a relationship defined by the magnitudes of H 3 and I F , i.e.…”

“…The use of graph theory permits to develop other interesting techniques such as the one reported in [21]. In that work, a method of protection for a MG was developed based on the principle of fault location.…”

Bidirectional isolated three‐phase dc‐dc converter using coupled inductor for dc microgrid applications

“…In recent years, with the modernization in several technology sectors, the electric power sector is subject to a hefty change, and one of the reasons for these changes is the development of environmentally friendly dc microgrid technologies, which has boomed and gradually received industry attention 1–13 . The microgrid can be considered as a small electric power system that incorporates generation, transmission, and energy storage (ES) and can achieve power balance and optimal energy allocation over a given area.…”

Microgrid protection using iterative filtering

“…Several protection schemes have been proposed in the literature to deal with the aforementioned issues, such as impedance‐based protection, distance protection, traveling wave‐based protection, adaptive protection with central processing unit, and differential protection schemes. Impedance and traveling wave‐based schemes are unsuitable for microgrids with shorter distribution lines.…”

“…List of symbols and abbreviations: CB, circuit breaker; DG, distributed generation; ELM, empirical mode decomposition; PLL, phase-locked loop; PWM, pulse width modulation; R, relay; T, transformer; VT, voltage transformer. Several protection schemes have been proposed in the literature to deal with the aforementioned issues, such as impedance-based protection, 2,3 distance protection, 4 traveling wave-based protection, 5,6 adaptive protection with central processing unit, [7][8][9][10][11] and differential protection schemes [12][13][14][15] . Impedance and traveling wave-based schemes are unsuitable for microgrids with shorter distribution lines.…”