摘要
提出了用四频带小波函数及其变换作为数学模型,对直流输电系统进行谐波分析的方法;采用奥地利G JWekileh所提出的成熟的谐波母线阻抗矩阵模型,基于MATLAB软件分析计算了电压、电流畸变因数。在此基础上,进一步提出了利用现有的有源滤波器,通过开发相应接口软件,由计算机控制滤波器输出信号,实现小波补偿,完成谐波抑制的设想。
At present, our country electrical power system overtone analysis and the suppression mainly is based on the time domain scope Fourier transformation, but this method has the frequency range to localize completely, but does not have the topicality in the time domain shortcoming. Cannot the precise definite overtone appear time and harmful overtone characteristic; Now already started in the European and American countries to use the 80＇s mathematics domain most outstanding research results-wavelet function, carried on the direct current transmission system the overtone analysis and its the suppression. The author synthesizes the domestic and foreign research results, proposed uses four frequency bands wavelets function and its the transformation took the mathematical model, carries on the overtone analysis to the direct current transmission system the method; Uses mature overtone generatrix impedance matrix model which Austrian J Wekileh proposed, based on MATLAB software analysis computation voltage, electric current distortion factor. In this foundation, further proposed the use existing active filter through the development corresponding connection software by the computer control filter output signal, the realization wavelet compensate, complete the harmonic suppression the tentative plan. Because the overtone is day by day serious to the electrical power system harm, therefore carries on the effective government and the suppression to it, has the obvious social economy benefit. Have to the direct current system overtone government and the suppression method many, including hardware and software aspect. Because the hardware aspect needs to receive the fund and the location limit, therefore seeks the software aspect the harmonic suppression method, has the extremely vital significance. The current main examination method all is based on the Fourier transformation, but the Fourier transformation has overtone this problem regarding any time is helpless. But the multi-frequency bands wavelet transformation can solve at the same time exactly the above this kind of time frequency the localization question. To contains the overtone the voltage to carry on based on the multi-resolutions orthogonal wavelet transformation, withdraws in the high criterion the transformation value, may obtain the electric current the fundamental wave component, because the wavelet analysis has the topicality while the frequency range and the time domain, therefore can track the overtone the change. This is precisely this article significance is at.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2006年第5期73-76,共4页
High Voltage Engineering
关键词
直流输电系统
谐波分析
多频带小波变换
畸变因数
谐波抑制
direct current power systems
harmonics analysis
multi-frequency range of wavelet
distortion factor
harmonic suppression
作者简介
赵文忠,1966-，副教授，从事电力系统教学和科研。电话：（0936）5979465;E-mail：zhaowz@hxu．edu.cn
刘永科,1965-．讲师．从事电力系统教学和科研。
闫国平,1986-．河西学院电气工程及自动化专业本科生。
