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Mathematical Morphological Filter Based Protection Scheme for DC Ring Microgrid System

This paper features mathematical morphological filter-based fault detection in a DC ring microgrid system for hybrid DC circuit breakers. With the current threshold-based fault detection scheme, a slower response time can result in higher fault current seen by the protection devices. The fault protection scheme presented in this paper does not only ensure faster response time and lower fault current, but also promises communication free protection coordination. The key components of the hybrid DC breaker are selected based on specific design metrics and the breaker topology is implemented in MATLAB/Simulink environment. The circuit breaker is then tested on a test DC ring bus system. Breaker operation and coordination via proper control logic is demonstrated for several line-to-ground fault cases. The results are compared with current threshold-based fault event detection scheme to evaluate the overall performance including breaker efficiency during normal and fault conditions.