With the rapid development of charging station

more and more attention has been paid to its power quality problems. Due to the characteristics of the charging station itself

the harmonic current generated by it changes gradually with the time variation. The detection speed and the starting speed of the traditional harmonic detection method based on i

p

-i

q

algorithm are low due to the influence of low flux filter and cannot meet the requirement of the harmonic control of the charging station. In this paper

the charging station model based on 6 sets of 6 pulse rectified chargers is set up on the basis of analyzing the 6 pulse rectified charger model. A kind of

harmonic current detection algorithm of adaptive filter based on variable step size LMS/LMF algorithm is proposed and its theory is analyzed in detail. It is shown by the simulation result that

compared to the traditional harmonic detection algorithm

the improved harmonic detection algorithm proposed has improved significantly the tracking speed and startup speed and reaches the expected results.