The co-phase traction power supply systems (CTPSSs) enjoy inherent advantages in eliminating phase breakers and suppressing negative sequences and have been set up on several railroads. However, CTPSSs involve a large amount of power electronics, and more trains can operate on the same traction network. The damping capability of the train-grid system may be weakened and the low-frequency stability issue becomes more serious. A proper impedance model of the CTPSS is essential for further investigation and applications. To this end, a $dq$ -frame impedance model for the CTPSS is developed and stability analysis is performed. First, the supply side of the CTPSS is simplified to a single-phase back-to-back converter with large grid inductance, while the load side is simplified to a rectifier. The impedance of the single-phase converter, that is, the co-phase power supply unit (CPSU), is derived in detail, which in turn leads to the impedance of the CTPSS. Second, the impact of the CPSU with its control parameters on the stability is revealed based on the generalized Nyquist stability criterion. We show that the low-frequency robustness can be improved by adjusting the control parameters of the CPSU without additional hardware. Finally, simulations and hardware-in-the-loop experiments are performed, which demonstrate the accuracy of the theoretical analysis.
Impedance Modeling and Stability Analysis in Co-Phase Traction Power Supply System
IEEE Transactions on Transportation Electrification ; 10 , 4 ; 9712-9726
01.12.2024
5578863 byte
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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