电力谐波检测及消除

【作者】 刘萍；

【导师】 卢志刚；

【作者基本信息】 贵州大学 ， 电气工程， 2008， 硕士

【摘要】 随着节能技术和自动化技术的推广,电力电子装置如变流设备、变频设备等,容量日益扩大,数量日益增多,使电网中的高次谐波愈来愈严重。谐波对电力系统安全、稳定、经济运行构成潜在威胁,给电气环境带来了极大影响,因此,谐波已被认为是电网的一大公害,对电力系统谐波污染的研究和治理,已成为近二十年来电工科学界的研究热点,涌现出了许多优秀的研究成果。通过学习和了解,现有的研究成果和理论文章多数是介绍谐波的治理方法,而介绍谐波分析方法的论文一般是针对大型电力系统进行分析和研究的,这些谐波分析方法通常利用谐波网络的数学模型(谐波网络的节点导纳矩阵)进行分析,由于电力系统中的某些元件的不对称性,使得数学模型复杂,计算起来极为繁琐,因此,一般结合计算机用于分析大型电力系统。而对较简单电力系统的谐波分析和谐波滤波工程而言,能够找到一种既简单易行,又满足工程实践需要的方法,是目前多数电力用户所需要的。正是从这一目的出发,本论文选用了一种简单实用的谐波分析方法一谐波阻抗法,这种方法原理简单,易于应用,尤其适合于工矿企业电网谐波的分析与治理。本论文从现场实际出发,对中国铝业贵州分公司下属电解铝厂电网的谐波进行了测量和分析,根据测量结果,设计了无源电力滤波器治理谐波的几种方案,并用谐波阻抗法对加入滤波器后的电力系统进行了谐波分析,以得到滤波器对系统谐波治理的效果。论文还使用MATLAB/SIMULINK进行了仿真,经比较,仿真结果和分析结果是一致的,从而表明该方法能正确地应用于谐波分析工程之中。更多还原

【Abstract】 Along with the energy conservation technology and the automated technology promotion,the electric power electronic installation like variable current equipment,the frequency conversion equipment and so on, the capacity expands day by day and the quantity increases day by day,which cause more and more serious higher harmonic in the electrical network the.Harmonic is apotential threat to security,stability and conversion working of the power system,has brought the enormous influence for the around electricity environment,therefore,the harmonic have been considered as a big environmental damage of electrical network.,In the recent 20 years,harmonic control and analysis has already been a hotspot in electrotechnics.Lots of excellent research productions about harmonic came forth.By study,majority of the research productions and theoretical papers are about how to control harmonic, and the harmonic analysis methods that were introduced are generally applied in large power system,these harmonic analysis methods usually use harmonic network’s mathematic model(the conductance and susceptance matrix of the node).But because of the dissymmetry of some elements in power system,the mathematic model is very complex,so it is very complicated to calculate by these methods,we commonly combine with computer and use them to analyze large power system.Now for many power consumers it is needed to find an easy method,which is fit to analyze comparatively simple power system or harmonic filter engineering.Based on this point,this paper brought forward a simple and convenient method-harmonic impedance method,which is especially fit to analyze the harmonic in mining power system.The paper systematically analyzed the theory and means of harmonic impedance method,and this method was certified in the harmonic filter engineering in the power network of ShanDong DongYue Energy Corporation Aluminum Factory.The paper set out from practice,we measured the harmonic in the power network of Guizhou Enterprise Of China Aluminum Co.,LTD.according to the results,we designed several harmonic control plans thatuse passivepowerfilter(PPF),and then used harmonic impedance method to analyze the power system which was equipped with filter,to find whether or not the filter could control the harmonic in the power system.Besides we also used MATLAB/SIMULINK to simulate the power system,by comparing,the simulating result was the same as the analyzing result,which indicated that harmonic impedance method can be rightly applied in harmonic analysis engineering.更多还原