4.8 Article

Performance Evaluation of a Modified Bidirectional Z-Source Breaker

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 8, Pages 7137-7145

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3000133

Keywords

Circuit faults; Inductors; Capacitors; Bidirectional control; Topology; Circuit breakers; Load modeling; Bidirectional power flow; circuit breaker; coupled inductor; design optimization; fault protection; interrupter; low voltage dc microgrid; short circuit; step load condition; Z-source network

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An optimized configuration of bidirectional Z-source circuit breaker using a coupled inductor is introduced for fault isolation in low-voltage DC microgrid. The proposed circuit breaker is designed to operate with a single coupled inductor, reducing component count and demonstrating fast fault clearance capabilities.
An optimized configuration of bidirectional Z-source circuit breaker using a coupled inductor is introduced for the fault isolation in low-voltage dc microgrid. The proposed circuit breaker is designed to operate with a single coupled inductor for bidirectional power flow. Use of the single coupled inductor for the power flow in both the directions reduces the component count. In this article, the operating principle of the breaker is explained for a short-circuit fault condition and breaker design criteria are derived. The performance of the circuit breaker is evaluated by carrying out a MATLAB simulation study. The functional prototype is developed to validate the breaker capabilities. Experimental results show that the fault is cleared within few microseconds. Additionally, the breaker is tested under the step load change condition for a current five times the steady-state rated current of the breaker and results are satisfactory.

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