毕业论文（设计）基于三相电压不对称时谐波和无功功率检测的Matlab仿真.doc

基于三相电压不对称时谐波和无功功率
检测的 Matlab仿真
摘要: 近年来,随着电力电子装备的广泛使用,在电力系统中污染越来越严重,已成为阻碍电能改善的一害。因此谐波检测成为谐波改善的一个重要方向,也是谐波分析的主要前提。
本文对常用谐波检测方法进行了分析和介绍,指出了当前三相不对称电路谐波检测中所要注意的方向。且对多种不对称电路进行了描述和介绍,利用常规方法进行三相不对称电路的谐波检测进行了介绍。
在基于park变换理论的谐波检测方法进行了理论介绍。该方法克服了基于瞬时无功功率理论的谐波检测方法存在的一些缺点。针对不对称谐波电流,进行了改进变换,且通过park变换可以将任意次谐波的正序分量与负序分量检测出来,并且本文对任意次谐波零序分量的应用等进行了理论演绎。该方法,不仅可以检测三相三线制不对称系统中的谐波分量,还可以用于三相四线制不对称系统谐波的检测之中。而且该方法在应用中得到了良好的效果。并且针对这些情况利用Matlab/Simulink进行仿真分析。所得出的图形验证了检测方法的正确性,可行性等。同时分析和比较了电源畸变等对检测电路所产生的影响。
关键字:谐波,三相不对称电路,无功功率,电流
指导老师签名:
Asymmetrical three-phase voltages to eliminate harmonics and reactive power The simulation of MATLAB detection
Student Name: Gui songbai Class: 1082022
Teacher: Li Jun
Abstract:In recent years, with the wide use of power electronic equipment, the harmonic pollution in power system es more and more serious, has e the effects of electric energy quality. Harmonic measurement is an important branch of harmonic research, is mainly according to harmonic analysis.
This paper studies and analyzes the detecting method of harmonic current detection of harmonic, points out the existing problems in unbalanced three-phase circuit. This paper describes and analysis of several typical asymmetric circuit, harmonic detection method using ponent and the rotating coordinate transformation phase of three-phase unbalanced circuit.
In the harmonic detection method based on Park transform theory is deduced. The method can e some ings of existing harmonic detection method of instantaneous wattles power based on the theory of. According to the asymmetrical harmonic current, through clockwise transform, the park transform can be an arbitrary harmonic detection of positive ponent and negative ponent, and the separation of random harmonic zero ponent, the theoretical derivation. This method not only can be arbitrary harmonic asymmetry system detection in three phase three line, also can be used for the detection of unbalanced three phase four wire system harmonic. But th