Electric Vehicle Charging Station Power Quality Comprehensive Treatment

With the intensification of global environmental pollution, oil resources are depleted, due to power electric vehicles instead of oil, with zero emissions, no pollution, low noise, etc., more and more governments and car companies importance as to achieve national an important tool for sustainable development, developed very rapidly in recent years. Therefore, some of the key technologies for electric vehicles gradually become a hot research.For power quality problems of electric car charging stations caused during work, to build a simulation model of electric vehicle charging stations. And based on the model of single and multiple electric vehicles into operation after charging machine problems caused by harmonics and reactive power were studied separately, summed up in the single and multiple electric vehicle charging machine put into operation harmonics and reactive characteristics. Here lay a solid foundation for the power quality of governance.APF were classified, for their characteristics were analyzed. In consideration of electric vehicle charging stations and network operation process of harmonic and reactive characteristics of the premise, choose a style injection parallel hybrid active power filter to manage power quality. In the filtering process, the active power filter is bear neither fundamental voltage nor fundamental current, thereby reducing the capacity of active power filter, reduce management costs, and both active power filter and advantages of passive power filter, can harmonic suppression and reactive power compensation.Analysis of hybrid active power filter structure and working principle, the characteristics of electric vehicles harmonic part of the passive design.In the hybrid active power filter control process for the harmonic current detection methods prevalent in delay, lack of detection accuracy and low stage, the use of an improved algorithm to detect dq transform harmonics and reactive current. The method of three-phase current and voltage d-q transformation after the corresponding component separation, and ultimately the detection of harmonic and reactive current, which detects speed, high precision, can detect harmonic current advantagesn. Regular sampling method using improved PWM modulation, compared with the traditional rules of sampling, real-time, to further improve the modulation accuracy. And simulation of the traditional control methods and improved control methods for comparison, the simulation results show the effectiveness of improved and advanced control methods.Focuses on the design of system parameters. Using Matlab/Simulink module build system simulation model simulation, and built a prototype system of the experiment. The simulation results and power quality analyzer can capture the experimental data showed that:injection into hybrid active power filter after total harmonic current distortion of electric vehicle charging stations is greatly reduced, reactive power compensation, power factor is improved to verify the effectiveness and practicality of the method. A summary of the work has been carried out in this thesis, make an outlook about some works and research direction on the next step.