A Hybrid Solid State Circuit Breaker for DC System using Coupled Inductor

Relative to solid-state circuit breakers that utilizes IGBTs and MOSFETs, the thyristor-based circuit breakers offer greater capacity and affordability, making them suitable for use as solid state breaker for higher power DC supply system. Nonetheless, recently the thyristor-based circuit breakers faced limitations towards reliably interrupting of fault currents during high resistance faults. To address this, a new and efficient circuit breaker is introduced in this paper, designed to accomplish automatic and controllable turn-off operations. The fault current through a coupled inductor is used to increase the capacitor voltage which turns-off the main switch. A fast acting switch is utilized to reduce the time of operation. This proposed configuration amalgamates the benefits of high efficiency, rapid responsiveness, and dependability. The effectiveness of the proposed circuit breaker is verified through MATLAB/SIMULINK simulation at a power rating of 25 kW DC system.