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Due to the dynamic performance and continuous function of superconducting magnetic energy storage (SMES), the SMES was fabricated into the electrical multiple unit (EMU) high-speed train traction converter system. The pollution of harmonic current from ac drive electric locomotives was an essential problem to analyze. To settle this problem, first, the influence of SMES technology in the current harmonic of train grid side was studied, in which the current analysis method was used and a harmonic suppression scheme was proposed. Next, the effects of harmonic frequency characteristics and amplitude characteristics on the current harmonic were analyzed, with adjusting the carrier frequency and increasing the leakage inductance of the traction transformer. Finally, the accuracy of the theoretical analysis method is verified by the simulation analysis and experimental verification. The results showed that the new type superconductivity technology proposed could optimize the train side harmonic current remarkably. [ABSTRACT FROM AUTHOR]

In this paper, the application of SMES system in the electrical multiple unit (EMU) was studied. With a new type of SMES rectifier and its novel control strategy, the EMU could immune through the over-phase region from the power off. The overvoltage impact on the related equipment due to the frequent power switch could also be reduced. With the combination of the DQ current decoupling control and transient direct control, the output power quality of the motor train grid side was obviously improved and the voltage adjustment time was significantly improved. The grid side harmonic was also suppressed, and the harmonic content was obviously reduced. All advantages on the dynamic response abilities presented above had been verified by the simulation and test results in this paper. [ABSTRACT FROM AUTHOR]