Comprehensive Modeling, Optimization, and Experiment of 10-kV/15-kA Forced Resonant DC Circuit Breaker

The dc circuit breaker (DCCB) is the core equipment for ensuring the safe and stable operation of the dc transmission system. It often requires high response times. In recent years, a new type of DCCB topology called forced resonant DCCB (FR-DCCB) has attracted widespread attention. It requires only a small amount of power electronic devices to provide mechanical switch zero crossing with
LC
circuit. And this topology offers advantages, such as multiple zero-crossing points, low cost, and the potential for faster response time. However, compared with the traditional DCCB solutions, the breaking process of FR-DCCB is extremely complex, which leads to the lack of mature control methods and parameter design theories. Therefore, to further improve the performance of FR-DCCB, this article proposes an efficient resonance control method based on the real-time feedback correction and a fast reclosing control method based on closing surge energy recovery, respectively, and also forms a complete optimization parameters design method. In addition, the parameters design method is presented to significantly reduce the oscillation time of FR-DCCB, thereby improving its response speed to meet engineering requirements. A prototype of FR-DCCB with the largest current breaking capacity has been developed and the effectiveness of the proposed methods has been verified.