At present

the electric locomotive running presently is mainly both Shaoshan and Harmony series locomotives which

for any series of locomotives

adopt high power electric and electronic technology for energy transformation. This will unavoidably affect the power grid and the harmonic issue during the running causes great challenge to the high efficient and safe operation of the public grid. Therefore

the operating principle of main circuit of electric locomotive in the heavy railway in China is analyzed

and the generated mechanism and feature of the harmonic of Shaoshan and Harmony electric locomotive is obtained through analysis of set simulation model. For verifying the correctness of theoretical analysis

the actual measurement at site is adopted to confirm the harmonic pollution problem which exists in the traction power supply system of heavy railway and the correctness of the theoretical analysis is verified. Finally

the harmonic control scheme of the traction power supply system of heavy railway is formulated specifically and the combinationofactive-reactivemodeisadoptedtoeliminatetheinfluenceofoperationoftheelectriclocomotiveonthepowersysteminaccordancewithsitemeasurementdataandthetheoreticalanalysisresult.