基于频域辨识的合并单元额定延时测量技术

发布时间：2018-05-20 06:58

本文选题：频域辨识 + 合并单元　；参考：《电测与仪表》2017年22期

【摘要】：智能变电站中合并单元数据采集和输出过程存在着固有的额定延时,此延时直接影响继电保护的动作时间。目前,额定延时测量方法存在着不足,给系统安全运行埋下了安全隐患。文中从合并单元采样环节的构成出发,分析其采样、处理过程中额定延时的群延迟特性和传变延迟。研究表明:时域中的群延迟在频域中相频特性应为线性相位,据此提出通过输入不同频率的信号以获得合并单元的相频特性曲线、进而辨识出额定延时的频域识别测量技术,并分析合并单元的相位误差对此额定延时测量方法的影响,最后通过理论仿真验证了此额定延时测量技术的可行性和正确性。文中所提方法为合并单元数字化采样延时测量的工程应用提供了一种切实可行的延时测量技术,能够确保继电保护系统的正确、可靠运行。
[Abstract]:There is an inherent rated delay in the process of data acquisition and output of merging units in intelligent substation, which directly affects the operation time of relay protection. At present, there are some shortcomings in the method of measuring the rated delay, which buries the hidden trouble for the safe operation of the system. Starting from the composition of the sampling link of the merging unit, this paper analyzes the sampling, the group delay characteristics and the transmission delay of the rated delay in the process of processing. The study shows that the phase frequency characteristic of group delay in time domain should be linear phase. According to this, the phase frequency characteristic curve of merging unit can be obtained by inputting signals of different frequencies, and then the frequency domain identification and measurement technology of rated delay is identified. The effect of the phase error of the combined unit on the measurement method of the rated delay is analyzed. Finally, the feasibility and correctness of the rated delay measurement technique are verified by theoretical simulation. The method proposed in this paper provides a feasible time delay measurement technique for the engineering application of digital sampling delay measurement of combined unit, and can ensure the correct and reliable operation of relay protection system.
【作者单位】：国网江苏省电力公司电力科学研究院;
【分类号】：TM63;TM76

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