Abstract
Background: The traction power supply system (TPSS) of railway mainly focuses on power
quality analysis. In the study of harmonic and negative order currents, about 80% of the literature
analysis are not specific enough there is a lack of completeness in the simulation system.
Objective: Analyze the influence of harmonic and negative current sequences of TPSS on the system
circuit, and realize intelligent recognition for different working conditions.
Methods: The converter is designed based on the transient direct current control technology and the
harmonic model of grid-side regenerative braking is established. According to the parameters of CRH2
(CRH380AL) locomotive, the EMU model is built and run in the TPSS for joint simulation. The availability
of the model is verified by combining the harmonic content and voltage level. Then, the distribution
of negative sequence current under the no-load, traction and regenerative braking conditions of the
system is analyzed in detail, and the negative sequence characteristic waveform under various conditions
is obtained, so as to obtain the variation law of negative sequence current under different conditions.
Results: Under the regenerative braking condition, the current harmonic distortion is much higher than
that under the traction condition. From the analysis of voltage and current phase, the power factor of regenerative
braking is also small. In the negative sequence analysis, the tip negative sequence current
impact phenomenon occurs mostly during the traction operation of the train, while the current impact
effect is weakened during regenerative braking, but the amplitude of the negative sequence fluctuation
shows an increasing trend.
Conclusion: The energy generated by regenerative braking will be utilized by the locomotive under
traction, and these bad electric energy forms will have extremely adverse effects on the process of
high-speed train receiving and changing current. These negative sequence analysis results can be used
to identify and classify different working conditions and divide and conquer energy compensation
actions to achieve energy saving and consumption reduction.
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