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In China, the unilateral power supply has been used in
AC electrified railway, which depends on the management mode of power system.
For better economic and technical indexes, all-parallel AT traction system is
widely used in passenger dedicated line. In this paper, the equivalent circuit
model of unilateral power supply and bilateral power supply is investigated,
and based on this model, the difference between unilateral power supply
impedance and bilateral power supply impedance is discussed.