基于PRONY算法的电容式电压互感器暂态基波辨识

为克服电容式电压互感器（CVT）的暂态过程引起的故障电压的测量误差，从而引起距离保护的超越，该文提出了一种基于Prony算法的新方法：在对系统进行仔细的考察后，确定了计算所需的阶数，并在考虑噪声的基础上直接计算CVT暂态信号中的基波分量，不需知道任何CVT参数，仅用1个周波左右的时间即可得到正确的值。文中以EMTP（电磁暂态仿真软件）的信号作为源信号，将Prony算法与全波傅立叶算法相比较，比较结果验证了算法的可行性与正确性。

IDENTIFICATION OF FOUNDAMENTAL WAVE IN CVT TRENSIENT PROCESS BASED ON EXPANEDED PRONY ALGORITHM

The transient error of CVT(Capacitive voltage transformer) usually causes the overreach of distance relay.So many researchers have emphasized their work on this issue.Unfortunately,none of them has come up with a satisfactory method that has wonderful performance in practical implementation.A new method based on expanded Prony is presented.The order of system is decided in advance after it was researched carefully.Then,with considering the noise,the fundamental value in transient signal of CVT is calculated directly which could achieve the correct value in about one fundamental cycle.No parameter of CVT is needed in the whole process.Finally,digital simulation gives the effect of Prony algorithm compared to whole cycle Fourier where the signal output by EMTP is used as source signal.