Main driving system of hybrid power locomotive

Abstract

The invention discloses a main driving system of a hybrid power locomotive. The main driving system comprises a main generator, a main contactor, a rectifying module, a power battery pack, an inverse module and a traction motor, wherein the main generator is connected with the rectifying module through the main contactor, and the rectifying module is connected with the inverse module; the inverse module comprises a capacitor, a first module group, a second module group, a third module group and a fourth module group; each module group comprises two serial modules, and each module is composed of a transistor and a diode which are connected in parallel; the capacitor, the first module group, the second module group, the third module group and the fourth module group are connected between the anode and the cathode of the rectifying module in parallel; the traction motor is connected with the second module group, the third module group and the fourth module group in the inverse module; one end of the power battery pack is connected with the cathode of the rectifying module, and the other end of the power battery pack is connected with an inductor and a current transformer in series and then is connected between the two modules of the first module group. The stability of the main driving system of the locomotive is greatly improved, the power battery pack is accurate and controllable in charging, and a solid foundation is provided for the technological development and wide-range application of the hybrid power locomotive.

Description

technical field [0001] The invention relates to a transmission system, in particular to a main transmission system of a hybrid locomotive. Background technique [0002] Such as figure 1 As shown, the main transmission system of the existing hybrid electric locomotive is mainly composed of the main generator 1, the main contactor 2, the rectifier module 3, the power battery pack 4, the inverter module 5 and the traction motor 6. The main generator 1 is connected to the rectifier module 3 through the main contactor 2, and the rectifier module 3 is connected to the inverter module 5. The inverter module 5 includes a capacitor C and first to fourth modules, the first module Including modules T7 and T8 in series, the second module group includes modules T1 and T4 in series, the third module group includes modules T3 and T6 in series. The fourth module group includes modules T5 and T2 in series, each module consists of parallel modules Composed of transistors and diodes, the cap...

AI Technical Summary

Problems solved by technology

Now the power battery packs of hybrid electric locomotives generally use lithium batteries, the internal resistance of the batteries is very small, and the voltage fluctuates by more than ten volts. The charging and discharging current of the power battery packs will cause large fluctuations, resulting in the instability of the entire main transmission system.

Especially in the traction working condition, since the power battery pack is directly connected to the intermediate DC link, if the intermediate voltage control is not precise enough and the voltage is too high, the power battery pack itself needs to be discharged, and it will become the intermediate DC link to charge the power battery pack. Insufficient power of the diesel engine will affect the stability of the diesel engine speed until the engine is turned off

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