Research And Simulation Of Parallel APF To Control Harmonics In Charging Station

The exhaust gas released by traditional fuel vehicles is one of the sources of pollution in the atmosphere,and it has attracted more and more people's attention.Together with the depletion of petroleum resources,fuel vehicles have been developed in the direction of energy-saving and green electric vehicles.The development of electric vehicles has also led to the construction of charging stations.However,the charging station of the charging station is a kind of non-linear load,which generates more irregular harmonics during charging,which causes the pollution of the power grid,which greatly affects the The power quality and safe and stable operation of the grid.For example,the extra power generated by the harmonic current will increase the power loss of the transmission line,which may cause malfunction of the electrical equipment or even cause a large-scale power outage.From this point of view,the harmonic control of the charging station is not negligible in the development process of the charging station.At present,electric vehicles are still in the initial stage of development,and there are few studies on the harmonic problems of electric vehicle charging stations.Based on this background,this paper first analyzes the current situation and development trend of electric vehicles and their charging stations,and introduces several measures of harmonic control of charging stations in detail,including the manufacturing process of charging machine,the construction of charging station and the charging station.After the harmonic control,and then combined with its own research direction,the parallel active power filter was chosen to control the harmonic problem of the charging station.By analyzing the harm of the harmonics of the charging station to the power system,the harmonic generation mechanism and characteristics of the charger are studied,and the harmonic current characteristics of the charging station are summarized.Secondly,based on the structure and working principle of the second type of high-frequency charger,a nonlinear resistor Rc is used to replace the high-frequency DC/DC power converter of the charger,and the equivalent model of the charger is obtained.In order to design the parallel APF model,an improved detection algorithm is obtained based on the instantaneous reactive power theory.The hysteresis comparison method is selected as the control strategy of the current tracking control circuit.Based on the PI control,a control algorithm is obtained.A DC-side voltage control method combining the ip-iqdetection algorithm.Finally,the power system module of MATLAB software is used to construct the simulation model of parallel APF suppression single and multiple charger harmonics.The simulation results show that when the parallel APF is integrated into the grid,the harmonic generated by the charger(station)can be basically eliminated.The wave current verifies the feasibility and effectiveness of the parallel APF to control the harmonics of the charging station.