Research On Harmonic Characteristics And Suppression Method Of Distribution System Of Medical Building

With the improvement of science and technology, type and number of the nonlinear load is increasing in hospital buildings, a large number of applications in all levels of the grid, a series of problems caused by lower power factor and harmonic pollution, resulting in the production equipment utilization rate decreased, the line voltage difference is too large and huge waste of energy and other consequences, for on the distribution systemreactive power compensation and harmonic control has become urgent to solve the problem of distribution network. The main research contents of this paper are as follows:①Research of harmonic in different monitoring points, low voltage power distribution system in hospital building. Research and Analysis on the harmonic characteristics of typical medical equipment in the hospital to carry on the research analysis, the harmonic characteristics of transformer, hospital, office building into the line side and the reactive power compensation device. This paper presents the typical load curve of different current waveforms on the main harmonic analysis and 24 hours of continuous, total harmonic distortion and harmonic distribution characteristics of low-voltage residential distribution system.②Experimental analysis of active power and power factor to solve the problem of nonlinear device experiment, differences between the actual power factor and current design manual, and analysis of nonlinear load has characteristics of neutral line current situation, find out the relationship between the neutral line current and phase current. And according to the results of the research, combined with the principles and methods of defects of the current building electrical design, puts forward the electrical design of hospital, office buildings amendment suggestions.③Harmonic resonance for the reactive power compensation device in under the action of harmonic, theoretical calculation and analysis, draw the circuit model and the condition of resonance. Based on the analysis of distribution system in hospital building, hospital construction of reactive power compensation device may have resonance, resonance over voltage criterion, in order to take the initiative to avoid the capacitor at.④According to the situation of hospital building harmonic, harmonic control scheme selection, harmonic with active power filter, and the simulation of the program the experimental data.This work for the hospital, office building in low voltage power distribution system harmonic, harmonic evaluation provides the basis, has certain theory and application value.