Abstract
In this paper, a di/dt detection circuit for DC breaker applications is proposed to provide faster short-circuit and overcurrent fault detection, where DC breakers are required to be designed for unidirectional fault current conditions, which is a challenge regarding DC microgrid applications due to some associated problems such as long periods of fault interruption, complex circuit structure, and low reliability. The proposal, which is based on measurement of di/dt, can detect fault current conditions for different distances from the point of failure, and is suitable to operation in both islanding and grid-connected conditions. The proposed circuit was studied theoretically and experimentally in steady state, as well as under load changes and short circuit conditions to ensure proper operation, making this solution a fast current fault detection solution, which is a significant advantage and requirement in DC microgrid applications.
Highlights
Due to the proliferation of distributed energy resources (DERs), microgrids (MGs) are becoming the future of power generation and consumption due to advantages such are becoming the future of power generation and consumption due to advantages such as operation in grid-connected or islanded modes, reduction in losses, and power quality as operation in grid-connected or islanded modes, reduction in losses, and power quality improvement improvement [1,2,3,4,5].[1,2,3,4,5]
Energy management devices and controllers are required to the DC MG [11]
We propose a method to detect short circuits and overcurrent faults based on di/dt; the method only considers measurements of bus currents
Summary
Due to the proliferation of distributed energy resources (DERs), microgrids (MGs) are becoming the future of power generation and consumption due to advantages such are becoming the future of power generation and consumption due to advantages such as operation in grid-connected or islanded modes, reduction in losses, and power quality as operation in grid-connected or islanded modes, reduction in losses, and power quality improvement improvement [1,2,3,4,5]. DERs, and ensure better stability [6,7,8,9,10]. Better compatibility with DERs, and ensure better stability [6,7,8,9,10]. Energy management devices and controllers are required to the DC MG [11]. Energy management devices and controllers are required ensure proper operation [11,12,13,14,15].
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