Filter design of resistance to interference of electrical fast transient/burst in intelligent gircuit breaker

To improve the performance of intelligent circuit breaker of resisting the interference of electrical fast transient/burst (EFT/B), an EFT/B interference source equivalent circuit model in accordance with the analysis of the generation mechanism and characteristics of EFT/B was created and the circuit state equation was established, a new Levenberg-Marquardt method was proposed to optimize the extended Kalman filter (EKF) algorithm on the basis of Taylor expansion, the derivation process of new theory was given and tracking performance and root mean square error (RMS error) was analyzed through the simulation experiment of EFT/B interference current transformer system which generated the EKF simulation results and evidence for the method was provided. Experimental results show that the improved EKF has higher estimate accuracy and stability and can improve the ability of resistance interference of the intelligent circuit breaker for EFT/B effectively.