LabVIEW+NICRIO平台的智能变电站核相仪设计

摘要目前，智能变电站的实施尚处于起步阶段，其中IEC61850 确定的通信模式及系统体系结构是未来数字化变电站的支撑基础。不同于传统变电站，智能变电站的二次回路采用电子传感器通过数字量输出、光纤传送，采集方式发生了很大变化，这就导致传统的核相方法难以实现。本课题深入介绍了传统站与智能站核相方法的差异以及 SV报文采集的原理，着重分析了核相仪的底层FPGA采集层和控制层，并利用CompactRio平台、 LabVIEW虚拟仪器来实现适合智能变电站的三种核相方法，并分析了三种方法的误差精度、提高测量精度的方法以及适用的场合,为实际智能变电站选用合适的核相仪提供了一个重要参考。 61049
毕业论文关键词智能变电站核相仪 CompactRio IEC 61850 SV
Title Design of Phase Difference Measurement Instrument in Smart Substation based on NI CRIO Platform
Abstract At present, the implementation of smart substation is still in its starting period, and the communication mode and system architecture based on IEC 61850 are the supporting foundation for the future digital substation. Unlike traditional substation, the secondary circuit of smart substation outputs digital values，transmits through fiber optic by employing electronic sensors, and the way phase test acquires data changes a lot, which leads it difficult to realize traditional phase measurement methods. The thesis introduces the difference between traditional and smart phase methods deeply and the method for SV acquisition, put an emphasis on analyzing the FPGA acquisition layer and control layer, and uses CompactRio platform and LabVIEW virtual equipment to realize three phase measuring methods which are suitable for smart substation. It also analyzes the accuracy of error, the way to increase the accuracy and the applicable occasions of the three methods. The thesis provides an important reference for smart substation to choose the appropriate phase difference measurement.
Keywords Smart Substation Phase difference measurement instrument CompactRio IEC 61850 SV

1 引言（或绪论） 1

1.1 研究的目的和意义 1

1.2 研究现状2

1.3 NI CRIO 平台及 LabVIEW 简介3

1.4 论文的主要工作5

2 智能变电站7

2.1 智能变电站的概念7

2.2 智能变电站的特点7

2.3 智能变电站的结构8

2.4 智能变电站与传统变电站的异同9

2.5 本章小结11

3 基于智能变电站的核相仪原理12

3.1 IEC 6185012

3.2 SV 报文13

3.3 过零法测量原理18

3.4 FFT 频谱分析法原理18

3.5 相关法原理19

3.6 贝叶斯频谱估计算法20

3.7 本章小结21

4 核相仪设计与实现22

4.1 总体设计22

4.2 硬件设计22

4.3 软件设计24

4.4 仿真分析26

4.5 本章小结36

结论 37

致谢 38

参考文献39

1 引言在智能电网中，智能变电站是智能电网的重要组成部分。智能变电站是数字化变电站的改善、升级与发展，从智能电网体系结构看，智能变电站是智能电网运行与控制的关键。在发电、输电、变电、配电、用电和调度这六大环节之中，变电环节占据着相当重要的地位，是智能电网中变换电压、接受和分配电能、控制电力流向和调整电压的重要电力设施，承担了全网的测量、监视、保护、控制等重要功能，是智能电网“电力流、信息流、业务流”三流汇集的焦点，是建设坚强智能电网的重要组成部分。 LabVIEW+NICRIO平台的智能变电站核相仪设计:http://www.751com.cn/zidonghua/lunwen_66655.html