Study Of The Harmonic In The Power Network Of Shandong Dongyue Energy Corporation Aluminum Factory

Along with the rapid popularization of power electronic units, harmonic pollution to public power network is more and more serious and the quality of electric energy is declining. 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 hannonic 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 ShanDong DongYue Energy Corporation Aluminum Factory, according to the results, we designed several harmonic control plans that use passive power filter (PPF), and then used hannonic 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.