| With the increasingly serious problem of energy shortage and environmental pollution,more and more attention has been paid to the electric vehicles,for its energy saving and environmental protection characteristics,which make it an important means for all countries to achieve sustainable development.The popularity of electric vehicles has promoted the large-scale construction of charging stations,however,as nonlinear and stochastic loads,the charging stations has a certain influence on the power quality of the distribution system,it is of theoretical and practical value to study the influence and solutions on the power quality of distribution system given by electric vehicle.Firstly,the operation principle and mathematical modeling of electric vehicle station are analyzed in detail,based on PSCAD/EMTDC simulation platform,the electric vehicle station is established,which is verified that the simulation waveform meet the theoretical analysis requirements.The harmonic current characteristics of station is derived in theory,based on the established simulation model,the changing law harmonic current is tested by changing some parameters,the results show that the harmonic current is related to the DC filter inductance,charging power and quantity,which can provide technical support for the parameter selection and construction of charging station.Through the theoretical analysis and simulation,it is proved that the high permeability of the unordered charging of electric vehicle station will cause the voltage drop in distribution system,an ordered changing method which is based on load forecasting and human-computer interaction is put forward to,by establishing the optimization equation to solve the optimal charging starting time for each electric vehicle,this method can adjust the load power curve by setting the charging starting time.This method not only meet the charging demand of electric vehicle,but also can effectively stabilize the load fluctuation,reduce the peak load. |
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