中文摘要：

摘要：为了提高智能断路器抗电快速瞬变脉冲群（EVF／B）干扰性，依据EFT／B形成和作用机理分析，建立EFT／B干扰源等效电路模型，给出电路状态方程；基于泰勒展开公式，提出了一种Lev—enberg—Marquardt优化扩展卡尔曼滤波算法，给出了方法的理论推导过程，并通过Enl／B干扰电流互感器系统仿真实验，给出了该方法与扩展卡尔曼滤波（EKF）仿真结果，并分析了跟踪性能和均方根误差。实验结果表明：改进的卡尔曼滤波器（NIEKF）具有更高的估计精确度和稳定性，该方法设计的扩展卡尔曼滤波器可有效提高智能断路器抗电快速瞬变脉冲群干扰能力。

英文摘要：

Abstract：To improve the performance of intelligent circuit breaker of resisting the interference of electri- cal 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 extend- ed 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 simula- tion 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 in- telligent circuit breaker for EFT/B effectively.