Energy-feedback type traction power supply device with low harmonic waves and high output power and control method of energy-feedback type traction power supply device

Abstract

The invention provides an energy-feedback type traction power supply device with low harmonic waves and high output power and a control method of the energy-feedback type traction power supply device. The power supply device comprises a phase-shifting transformer, a PWM rectifier unit and a control unit. A primary side three-phase winding of the phase-shifting transformer is in star connection. Two secondary side three-phase windings of the phase-shifting transformer are respectively in delta connection and in star connection. The primary side three-phase winding of the phase-shifting transformer is used for being connected with an AC power supply. The two secondary side three-phase windings of the phase-shifting transformer are connected with an AC side of the PWM rectifier unit. The control unit is connected with the PWM rectifier unit. The control unit controls the PWM rectifier unit through a fixed amplitude vector in an SHEPWM mode. Through the energy-feedback type traction power supply device with the low harmonic waves and the high output power and the control method of the energy-feedback type traction power supply device, active power outputted by the PWM rectifier unit can be improved, and current harmonics can be reduced.

Description

technical field [0001] The invention relates to traction power supply technology for electric locomotives, in particular to an energy-feedback traction power supply device with low harmonics and high output power and a control method. Background technique [0002] At present, electric locomotives, especially urban rail trains, generally use DC power supply. The traction power supply device of the substation supplies power to the train. The traction power supply device uses 12 or 24 pulse diode rectifier units to convert the AC power of the AC grid into DC power for the train. DC traction network power supply, the DC output voltage of the existing diode rectifier unit is uncontrollable and the voltage fluctuation range is large; and the energy of the diode rectifier unit can only be transmitted unidirectionally from the AC side to the DC side, and the braking energy during regenerative braking of the train cannot Feedback to the AC grid requires braking resistors to consume e...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an energy-feedback traction power supply device and control method with low harmonics and high output power to solve the technology in the prior art that the harmonic content of the alternating current is large and the output power is limited by the alternating voltage amplitude of the PWM rectifier defect

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