Research On Harmonic Characteristics And Simulation Technology Of Power Consumption

In recent years, due to the widespread application of commercial, industrial and new electric equipments, harmonic wave has seriously affected not only the power quality and safety of the power grid, but also the function of the equipments. Therefore, researchers are increasingly interested in the study of harmonic wave. And the measurement and simulation of harmonic wave are the most important areas in the study.Although many models have been developed to accurately calculate characteristics harmonic current of various types of large and medium capacity rectifiers, it has been difficult to develop models for other harmonic sources, such as electric lamp, computer, the color television and other domestic electric appliances; the steel-refining furnace and high-efficiency frequency conversion equipments relying on industrial electricity; as well as direct-current charging equipments on electric automobiles. Researchers haven't found an effective analysis method. In this article, we tried to develop a model by combining the site survey data and designed empirical data together, to build harmonic source models for various power load.Then describes the modeling method of power load is the single-phase equivalent circuit simulation, respectively to establish the nonlinear load and electric load characteristics of the measured data of the nonlinear mathematical model based on, and then measured for single-phase electricity load in common, the use of the measured data, study a variety of single phase external characteristic of electric load the spectrum, harmonic analysis, and then based on the MATLAB-SIMULINK software, the simulation of single-phase electricity load harmonic characteristics, simulation analysis can be seen in the simulation results and the theoretical analysis results are in good agreement.In the research of traditional harmonic, at the end of this paper, the new electricity load harmonic sources is studied, in the establishment of a DC charging equipment equivalent electrical model and load characteristics on the basis of the research, aiming at a single DC charging device modeling and simulation analysis, the simulation of frequency spectrum and field measured spectrum compared. Then the charging station multiple DC charging equipment at the same time start the harmonic caused by superposition or analyze the attenuation effect. The establishment of the measured DC charging equipment simulation based on mathematical model. By simulation on a single DC charging equipment and multiple DC charging equipment, electric vehicle DC charging equipment verify the established (station) simulation model can reflect the actual DC charging equipment (station) harmonic current situation at work, and deduce the electric vehicle charging station with multiple DC charging equipment at the same time work when the harmonic current existence of weakening effect.