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基于低延迟有限冲击响应滤波器的差动保护采样率转换算法

, PP. 241-248

Keywords: 差动保护,采样频率转换,有限冲击响应滤波器,低延迟,低通滤波器

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Abstract:

智能变电站中,电子式电流互感器(ECT)取代传统的电磁式电流互感器向差动保护装置提供电流信息。工程中,不同采样频率的ECT要求保护装置重采样,统一多路电流数据的采样频率。为解决此问题,本文提出了一种改进的差动保护采样率转换算法。该算法基于低延迟有限冲击响应滤波器原理,并以此为基础构造了基于约束最小二乘法设计的可用于信号抽取和插值环节级联的低通滤波器,实现了任意有理数倍频率转换的快速响应。仿真结果表明,较基于切比雪夫逼近原理的传统低通滤波器,采用改进算法的低通滤波器的数据输出响应速度提高了37.5%,峰值瞬时误差可控在3.683%以内,可以有效地减少数据传输延迟,提高差动保护动作的快速性。

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