Low-Voltage Solid State DCCB Design Based on Bypassed Bidirectional Thyristor-Capacitor Suppressor

This article introduces a novel technique known as bidirectional thyristor capacitor designed to interrupt dc currents effectively and mitigate power surges in low-voltage (LV) solid-state dc circuit breakers (SS-DCCB). The method employs parallel snubber capacitors to absorb switching effects, subsequently releasing stored energy during the subsequent switch operation. The model incorporates considerations for both line and load inductances, offering a realistic portrayal of a dc system and ensuring authentic protective measures. To validate the efficacy of this approach, practical results from the system are cross-referenced with simulation outputs, validating the credibility of the research findings. Additionally, an ARM microcontroller is programmed to control the sequence of actions among the active SS switches, optimizing their performance. The proposed LV SS-DCCB operates at a voltage level of 48 VDC and nominal current of 8 A. However, the design is scalable and can be extended to accommodate higher voltage and current ranges.