A Series-Type Dual-Coupled-Inductors Based Hybrid Circuit Breaker With Simple Start-Up Operation and Adaptive Reclosing Capability
Zeng Liu, Chao Zhang, Yachao Yang, Zishun Peng, Bo Hu, Huang Chun, Jun Wang
Abstract
The series-type hybrid circuit breaker (S-HCB) offers ultra-fast DC fault protection benefits from the omission of the parallel commutation process. However, the S-HCB suffers from complex start-up operations and a lack of adaptive reclosing exploration. To address these issues, this article introduces a novel S-HCB based on the series connection structure of two coupled inductors with different turn ratios, which performs active injection to break fault with fewer capacitors (only a capacitor), obtaining significantly simplified start-up operation. Moreover, by fully exploring the fault current characteristics during the zero-current modulation stage, the proposed S-HCB can achieve adaptive reclosing without additional circuits and complex control. The operation principle of the proposed S-HCB is detailed, and comprehensive start-up, adaptive reclosing strategy, and design considerations are presented. A 300V/20A prototype is built, and the results indicate that the proposed S-HCB can achieve fast fault breaking (11 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula> s/40A) and high efficiency transmission (99.08%/6kW) while obtaining simple start-up operation and adaptive reclosing capability.