Modeling and simulation of DC charging pile load based on a novel topology structure
To solve the problem of low charging efficiency of electric vehicle charging piles,a new topology of DC charging pile was proposed against the application background of high-power factor operation and charging efficiency improvement.The structure consists of a three-phase voltage source PWM rectifier and a half-bridge LLC resonant converter.With the dual closed-loop control method and space vector pulse width modulation technology as the control strategy,its mathematical model and external characteristics in different coordinate systems were obtained.Based on the Matlab/Simulink platform,an experimental prototype with 100 kW/500 V output was built.Simulation results show that under the control strategy of dual closed-loop and space vector pulse width modulation,this new structure can realize high-power factor operation and stable output voltage,verifying the advantages of this structure in improving charging efficiency.
DC charging stationthree-phase voltage source PWM rectifierspace-vector pulse-width modula-tionLLC resonant converter
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