一种新型变电站智能设备采样值接口方案

随着电子互感器技术的发展和IEC61850标准的推广,变电站间隔层智能设备的交流采样技术将由传统的对模拟信号A／D转换技术变革为以太网通信技术。为了不改变传统保护、测控装置算法,分析了采用Lagrange线性插值对合并单元输入的采样值进行数据抽取的可行性,研究了插值抽取的方法,进行了误差分析,同时分析了谐波信号对插值算法的影响。

A Novel Interface Solution to Sampled Values for Substation Intelligent Electronic Device

With the development of electronic transformers and the extensive utilization of the international standard IEC61850, the sampled values technology in IEDs in substation bay layer will be developing from A/D conversion of analogue signals to ether net communication technology. In order to apply the traditional algorithms in IEDs in substation automation systems, the linear Lagrange interpolation algorithm is analyzed. The paper analyzes the feasibility of the algorithm of interpolating the sampled data from merging unit. The error analysis is presented. The effect of harmonic signal to the interpolation algorithm is also analyzed.