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随着电子式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,分析了采用线性Lagrange插值原理对合并单元输入的采样值进行数据抽取的方法,进行了误差分析,并分析了谐波信号对插值算法的影响。最后简要介绍了该方法在新型数字化变电站测控装置中的应用,经测试,精度满足要求。
With the development of electronic transformer technology and the popularization of IEC61850 standard, the AC sampling technology of substation interlayer intelligent equipment will be transformed from the traditional analog signal A / D conversion technology to Ethernet communication technology. In order to not change the traditional protection, measurement and control device algorithm, the method of linear Lagrange interpolation to extract the data sampled by the merging unit was analyzed, the error analysis was carried out, and the influence of the harmonic signal on the interpolation algorithm was analyzed. Finally, the application of this method in the new digital substation monitoring and controlling device is briefly introduced. After testing, the accuracy meets the requirements.