Constant power control method and device, and constant power traction drive system

Abstract

The embodiment of the invention provides a constant power control method and device, and a constant power traction drive system. The constant power control method comprises the steps of using the difference between the output voltage of a rectifier and the target voltage, the difference between an output current of the rectifier and a target current and the difference between output power of the rectifier and target power as control variables, generating a pulse signal with the corresponding pulse width according to the control variables, and using a pulse modulation signal with the same pulse width to have control over an exciting current of a generator. Therefore, it is ensured that the direct current output by the rectifier connected with the generator is strictly controlled within the reasonable range, traction power output by a traction motor which is connected with the rectifier through an inverter can be within the reasonable range, a fault which is caused due to the fact that in the prior art, traction power output by a traction motor exceeds a limit is avoided, and the power output by the traction motor can be controlled within the reasonable range.

Description

technical field [0001] The invention relates to the traction control technology of a diesel train set, in particular to a constant power control method, device and constant power traction drive system. Background technique [0002] As a modern rail transportation tool, the diesel EMU is suitable for short-distance passenger transportation between cities and suburbs, and has high economy and practicability. At present, the driving mode of the traction drive system of the diesel multiple units mostly adopts the AC-DC-AC drive mode. like figure 1 shown. The traction drive system includes: a diesel generator, a rectifier 16 , an inverter 17 , a traction motor 18 and a traction controller 21 . The diesel generator includes: an engine 14 and a generator 15 connected to the output shaft of the engine 14 . The AC output end of the generator 15 is connected to the AC input end of the rectifier 16, the DC output end of the rectifier 16 is connected to the DC input end of the inver...

AI Technical Summary

Problems solved by technology

[0003] Any one or more of the generator, rectifier and inverter in the traction drive system will cause the current input to the traction motor to deviate after being subjected to external electromagnetic interference, and then the traction power output by the traction motor will exceed the limit, which will easily lead to Faults such as engine flameout of the diesel generator and overcurrent of the input current of the inverter occur, and at the same time cause damage to the electrical components in the traction drive system

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