基于GPS的智能变电站高精度时钟设计与实现

发布时间：2018-11-10 20:39

【摘要】：随着IEC61850标准的不断完善,智能变电站对时钟源精度和稳定性的要求越来越高。本文以智能变电站为应用背景,根据GPS与晶振的误差互补特性,提出了满足智能变电站时钟同步精度要求的高精度时钟设计方案。论文首先研究了GPS时钟与晶振时钟误差特性,并对GPS时钟与晶振时钟的秒脉冲时间间隔进行分析,论证了该时间间隔为GPS时钟与晶振时钟误差之和；然后,对实验采集的秒脉冲时间间隔曲线进行傅立叶分析,从而确定采用小波滤波+RBF神经网络预测的高精度时钟算法,并完成对高精度时钟的总体结构和各模块的设计；接着,采用MATLAB软件对小波滤波算法、RBF网络预测算法以及组合算法进行仿真验证,结果表明本文高精度时钟算法能够很好地滤除GPS时钟的随机误差,并实现对晶振时钟误差的精确预测。论文最后还论述了本文高精度时钟的软硬件实现过程,其中包括Compact-RIO平台的开发和IRIG-B码解析板卡的研制两个部分。采用铷原子钟装置对本文所设计的高精度时钟进行性能测试,测试结果表明该高精度时钟输出的秒脉冲精确性高、稳定性好,能够满足智能变电站时钟精度的要求。
[Abstract]:With the improvement of IEC61850 standard, the precision and stability of clock source are required more and more in intelligent substation. Based on the application background of intelligent substation and the complementary error between GPS and crystal oscillator, a high precision clock design scheme for intelligent substation clock synchronization accuracy is proposed in this paper. Firstly, the error characteristics of GPS clock and crystal oscillator clock are studied, and the second pulse time interval between GPS clock and crystal oscillator clock is analyzed. It is proved that the time interval is the sum of GPS clock and crystal oscillator clock error. Then, the time-interval curve of second pulse is analyzed by Fourier analysis, and the high-precision clock algorithm predicted by wavelet filter RBF neural network is determined, and the overall structure of high-precision clock and the design of each module are completed. Then, the wavelet filtering algorithm, the RBF network prediction algorithm and the combination algorithm are simulated by MATLAB software. The results show that the high precision clock algorithm in this paper can filter the random error of GPS clock very well. The accurate prediction of clock error is realized. At the end of the paper, the software and hardware implementation of high precision clock is discussed, including the development of Compact-RIO platform and the development of IRIG-B code analysis board. The performance of the high precision clock designed in this paper is tested by using rubidium atomic clock device. The test results show that the clock output of this high precision clock has high accuracy and good stability, and it can meet the requirements of clock precision in intelligent substation.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM63;TM76

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