Hybrid power rail vehicle and direct-current bus voltage control method and system thereof

Abstract

The invention discloses a hybrid power rail vehicle and a direct current bus voltage control method and system thereof, the real-time voltage / energy of a rear-end energy storage power supply is adjusted by adjusting the target voltage of the output end of a direct current chopper at a speed, and as the rear-end energy storage power supply is directly connected with a direct current bus in parallel, the adjustment of the DC bus voltage is equivalent to the adjustment of the real-time voltage / energy of the rear-end energy storage power supply. When the vehicle is in a high-speed traction working condition, the voltage / energy of the rear-end energy storage power supply is controlled to be in a lower value, and when the whole vehicle enters a regenerative braking working condition, the rear-end energy storage power supply can absorb more regenerative braking energy, so that the absorption rate and the utilization rate of the regenerative braking energy are improved; when the vehicle is in a low-speed traction working condition, the voltage / energy of the rear-end energy storage power supply is controlled to be in a high value, and when the whole vehicle enters a regenerative braking working condition, the rear-end energy storage power supply can still absorb regenerative braking energy due to the fact that the regenerative braking energy at a low speed is relatively low at a high speed.

Description

technical field [0001] The invention belongs to the technical field of hybrid rail vehicle control, and in particular relates to a hybrid rail vehicle and a DC bus voltage control method and system thereof. Background technique [0002] With the continuous development of rail transit energy storage technology, on-board energy storage technology has been used more and more in the field of rail transit as a power source. Due to the limitation of the development of energy storage technology, the performance of a single energy storage device is difficult to meet the requirements of power performance and mileage of the vehicle at the same time. By adopting the method of electric-electric hybrid energy storage, the energy-type energy storage Devices are mixed and matched to meet the power and energy needs of the vehicle. [0003] Electric-electric hybrid is to electrically mix and match two kinds of energy storage devices, and power devices usually choose batteries or supercapaci...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a hybrid rail vehicle and its DC bus voltage control method and system to solve the problem of the low DC bus voltage caused by the low energy of the battery or super capacitor, which leads to the traction inverter under the traction condition of the vehicle. There may be an overcurrent fault and blockage of traction, and the problem that the regenerative braking energy of the vehicle cannot be effectively absorbed due to the high energy of the battery or super capacitor, resulting in a low utilization rate of regenerative braking energy

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