Internal combustion locomotive alternating current auxiliary generator excitation control device

Abstract

The invention discloses an internal combustion locomotive alternating current auxiliary generator excitation control device. Three-phase electricity output by an internal combustion locomotive auxiliary generator is input to the internal combustion locomotive alternating current auxiliary generator excitation control device, an output end of the internal combustion locomotive alternating current auxiliary generator excitation control device is connected with an end 1 of a controller, and an end 2 of the controller is connected with a locomotive storage battery. The internal combustion locomotive alternating current auxiliary generator excitation control device comprises a full-bridge rectifying circuit, a middle direct current circuit, a chopping power switch template, a control plate, an absorption circuit and a flywheeling diode. The internal combustion locomotive alternating current auxiliary generator excitation control device has the advantages that the auxiliary generator is good in voltage control effect and high in accuracy. The auxiliary generator excitation control device can rectify the three-phase electricity output by the auxiliary generator in a full-bridge mode so as to be small in effect on voltage of the auxiliary generator and high in wave coefficient. A chopping tube can work on the high frequency condition and is high in system response and high in adjusting accuracy on voltage of the auxiliary generator.

Description

technical field [0001] The invention belongs to power electronic devices, in particular to an excitation control device for an AC auxiliary generator of a diesel locomotive. Background technique [0002] At present, the auxiliary system of railway diesel locomotives in my country adopts AC drive, and the power is provided by the AC auxiliary generator of the locomotive. The auxiliary generator adopts an AC synchronous generator, and the auxiliary generator rotates synchronously with the locomotive diesel engine, and the excitation of the auxiliary generator is controlled so that the output of the auxiliary generator maintains a constant U / f characteristic. [0003] At present, there are mainly two excitation methods for auxiliary generators in my country, phase-controlled rectification excitation method and fixed excitation method: [0004] 1) Phase-controlled rectification excitation mode [0005] The three-phase alternating current output by the auxiliary generator is re...

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Problems solved by technology

The fixed excitation of the auxiliary generator makes the output voltage of the auxiliary generator not a closed-loop control. Especially when the load is different, the output voltage value of the auxiliary generator will be different, so that the output of the auxiliary generator deviates from the U / f constant characteristic to a certain extent. bad job

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