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

A power battery and control method technology, which is applied in the field of rail transit, can solve the problems of reducing the charging and discharging depth of the power battery system, shortening the service life of the battery, and affecting the performance of the locomotive, so as to increase the charging depth, prolong the service life, and improve safety. Effect

CN112140890BActive Publication Date: 2022-03-29CRRC ZIYANG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-03-29

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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.
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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...

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Such as figure 2 As shown, the present invention provides a multi-branch power battery system control method, which divides the energy of the large-capacity power battery system, and divides the large-capacity power battery system into multiple independently controllable branches with smaller capacities and connects them in parallel. , which greatly improves the safety of the power battery system; the specific scheme is as follows:

[0026] A control method for a multi-branch power battery system of a hybrid 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 BAT1-BATn, a battery management system, and a battery branch The traction converter connected in parallel and the generator set for charging the battery, each battery branch is equipped with an IGBT ...