Multi-stage series mobile power supply system

Abstract

A multi-stage series mobile power supply system comprises movable power supply vehicles and an electric engineering machinery; the movable power supply vehicles provide electric power to the electric engineering machinery; a storage battery, an output electric power conversion device, a cable twisting and releasing device, a charging device, a powered device, an input electric power conversion switch and an output electric power conversion switch are mounted on each movable power supply vehicle; cables which can be automatically twisted and released are arranged in the cable twisting and releasing devices; and the input electric power conversion switches and the output electric power conversion switches are used for converting power supply lines in the movable power supply vehicles. According to the multi-stage series mobile power supply system, by using a technique of using the plurality of movable power supply vehicles with different sizes to supply power in an overlapped manner, the mobility, transportability, hoisting property and so on of the system are guaranteed, the continuous working time is long, the structure and operation are simple, multi-stage rectification and frequency conversion are avoided and electric power loss is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric engineering machinery, and relates to a multi-stage serial mobile power supply system of communication technology and control technology. Background technique [0002] For example, when electric construction machinery such as excavators are powered by mobile power supply vehicles, considering the mobility of the excavator, as well as the transportability and hoisting of the power supply vehicles, it is hoped that the power supply vehicles can be as small as possible, light in weight, and reliable. This will inevitably cause the battery capacity to be small, and the working time can be maintained for a short time. In addition, during the working process of the excavator, it is inconvenient to remove and plug the plug of the power transmission line in order to replace the power supply vehicle. Time doesn't work. [0003] One solution is to use multiple power supply vehicles with the same main circ...

AI Technical Summary

Problems solved by technology

[0002] For example, when electric construction machinery such as excavators are powered by mobile power supply vehicles, considering the mobility of the excavator, as well as the transportability and hoisting of the power supply vehicles, it is hoped that the power supply vehicles can be as small as possible, light in weight, and reliable. This will inevitably cause the battery capacity to be small, and the working time can be maintained for a short time. In addition, during the working process of the excavator, it is inconvenient to remove and plug the plug of the power transmission line in order to replace the power supply vehicle. time doesn't work

[0003] One solution is to use multiple power supply vehicles with the same main circuit structure to connect them in series to supply power. Each power supply vehicle is only different in battery capacity and some auxiliary functions, so that the power output of the latter power supply vehicle can be plugged into the previous power supply. On the charging interface of the vehicle, let the latter power supply vehicle supply power to the front electric construction machinery through the previous power supply vehicle, but because the power supply vehicle uses the AC power converted from direct current through the inverter to output externally, such a current The frequency components are very complex, so it is not suitable as a charging power source for the next power supply vehicle, and multi-stage rectification and frequency conversion will also bring more power loss

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