摘要本课题的研究目的是设计三相不平衡度检测系统,论文中首先介绍了三相不平衡以及其危害和防治办法,然后给出了三相不平衡度的计算方法并对特殊情况的近似算法作了解释,接着通过对运算放大器的全面研究引出了负序分量过滤器以及低通滤波器的设计方案。应用谐波检测理论实现对称分量法计算三相不平衡度,再通过Matlab7仿真软件仿真出结果。最后在利用软件汇编语言进行程序的设计之后,建立了检测电路的各个模块的电路图以及整合在一起的总电路图,最后给出了具体信号下的检测结果。63691
毕业论文关键字 三相不平衡度 对称分量法 运算放大器 谐波检测理论 Matlab7 8051单片机
毕业设计说明书(论文)外文摘要
Title The design of unbalanced three-phase detection system
Abstract
The objective of this research is the design of three-phase unbalance degree detection system, the paper introduced the first three phase unbalance and its harm and prevention measures, and then gives the calculation method of three-phase unbalance degree and approximate algorithm for special cases are explained, followed by a comprehensive study of the operational amplifier has led to negative sequence component filter and the low-pass filter design. Application of harmonic detection theory to realize the symmetrical component method to calculate the three-phase unbalance, and through Matlab7 simulation software simulation results. After the last program design by using the software of assembly language, established the circuit diagram of each module of the detection circuit and integrated in the overall circuit diagram. Finally, the testing results are given specific signal.
Keywords Three-phase unbalance degree Symmetrical component method Operational amplifier Harmonic detection theory Matlab7 SCN8051
1 引言 1
1.1概述 1
1.2三相不平衡的危害及影响 1
1.5 本章小结 5
2 三相不平衡度的检测方法 6
2.1三相不平衡度检测的补偿装置的研究 6
2.2影响三相不平衡度检测的原因 8
2.3从负荷电流不平衡的危害与防范来检测三相不平衡度 8
2.4三相不平衡度数字检测系统 10
2.5应用数理统计方法分析判断空心电抗器三相不平衡原因 11
2.6三相不平衡度估算公式的修正 14
2.7本章小结 16
3 运算放大器的原理及应用 17
3.1运算放大器的原理 17
3.2运算放大器的类型 17
3.3运算放大器应用过程中的一些主要参数标识和解释 19
3.3.1共模输入电阻(RINCM) 19
3.6 简易集成电路型负序分量过滤器设计 22
3.7本章小结 26
4 对称分量法以及运用对称分量滤波器检测 27
4.1用对称分量法检测三相不平衡度 27
4.2谐波检测理论 27
4.3系统试验及仿真