智能电网中电动汽车充电站的谐波抑制方法研究

电动汽车的快速发展推动了电动汽车充电站的广泛建设，大量充电机的投入运行将对电网产生严重的谐波危害，12脉动整流变压器的应用将有效地降低充电站的谐波电流。先对现有的6脉动整流充电机的优缺点进行了分析，在此基础上以串联型12脉动整流充电机为例分析了电网侧电流的谐波，并对无源滤波器的原理进行简介，最后通过实验进行了6脉动整流、6脉动整流加无源滤波器、12脉动整流、12脉动整流加无源滤波器的电网侧谐波电流比较。通过实验验证，12脉动整流变压器加无源滤波器的形式谐波抑制效果较佳。

Harmonic Reduction Method of Electric Vehicles Charging Station in Smart Grid

The rapid development of electric vehicles results in wide construction of the charging stations for electric vehicles;however,a large number of charging machines put into operation would generates severe harmonics to the power grid.Application of the 12 impulsion rectifying transformer could effectively reduce harmonic circuit in the charging station.This paper,first of all,analyzes the advantages and disadvantages of the existing 6 impulsion rectifying transformer.Then,taking the series 12 impulsion rectifying transformer as an example,it analyzes the circuit harmonics on the power grid’s side with the principle of passive filter briefly introduced.Finally,through tests,comparisons are made between the 6 impulsion rectifying transformer,the 6 impulsion rectifying transformer and passive filter,the 12 impulsion rectifying transformer,the 12 impulsion rectifying transformer and the harmonic circuit of the passive filter of the power grid.The tests suggest that the harmonic form of the 12 impulsion rectifying transformer and passive filter has the best control effect.