抗干扰算法改进的发电机转子接地保护

转子接地保护测量回路受励磁系统调节、谐波、非周期分量以及电磁干扰的影响较大，为提高转子接地保护的精度与可靠性，提出了一种基于采样数据筛选的抗干扰算法。所提算法避开了转子绕组等效对地电容充放电的暂态过程，采用软硬件滤波减小了谐波的影响，通过采样数据筛选减小电磁干扰的影响。对所提算法进行了试验验证，结果表明该算法有效提高了转子接地保护的精度与可靠性。

Generator rotor grounding protection improved by anti-interference algorithm

The measurement circuit of the rotor grounding protection is greatly affected by excitation system regulation, harmonics, non-periodic components and electromagnetic interference. In order to improve the accuracy and reliability of rotor grounding protection, an anti-interference algorithm based on sampled data filtering is proposed. The proposed algorithm avoids the transient process of charging and discharging the equivalent grounding capacitance of the rotor winding, uses software and hardware filtering to reduce the impact of harmonics, and reduces the impact of electromagnetic interference through sampled data filtering. The test results verify that the proposed algorithm effectively improves the accuracy and reliability of the rotor grounding protection.