A control method for a multi-branch power battery system of a hybrid electric locomotive

Abstract

The present invention provides a method for controlling a multi-branch power battery system of a hybrid electric locomotive, the control method is based on a multi-branch power battery system, and the power battery system includes a plurality of parallel battery branches, a battery management system, and a battery The traction converters connected in parallel with the branch circuit and the generator set for charging the battery, each battery branch circuit is equipped with an IGBT element; calculated according to the maximum allowable charging current of each branch circuit provided by the battery management system and the charging current of the diesel generator set The target charging current of the battery in the branch is controlled by the traction converter to control the turn-on time of the IGBT element on each branch so as to control the charging current of each battery branch. The control method provided by the invention can effectively improve the safety, performance and service life of the power battery system.

Description

technical field [0001] The invention relates to the field of rail transportation, in particular to a control method for a multi-branch power battery system of a hybrid locomotive. Background technique [0002] In the field of rail transit, when the energy of the power battery system is low, a single-branch power battery system is generally used; when the energy of the power battery system is large, in order to reduce the damage caused by the thermal runaway of the power battery system For energy division of the system, two or more power battery branches are generally selected to be connected in parallel through contactors and then connected to the main circuit, such as figure 1 shown. Due to the differences in the internal resistance and voltage of each branch, the charging current between the branches is not controlled; there is no current control element between the branches, and it is easy to form a circulating current between the branches, which will shorten the service...

AI Technical Summary

Problems solved by technology

Due to the differences in the internal resistance and voltage of each branch, the charging current between the branches is not controlled; there is no current control element between the branches, and it is easy to form a circulating current between the branches, which will shorten the service life of the battery. And cause potential safety hazards; when the voltage of individual batteries in a branch circuit is low or high, it will reduce the charging and discharging depth of the entire power battery system and reduce the available power, thus directly affecting the performance of the locomotive

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