A method for calculating short circuit current of a vehicle multi-voltage level direct current power grid

By constructing a multi-voltage system power grid topology and using the superposition principle to calculate the short-circuit current of the vehicle's multi-voltage level DC power grid, the problem that existing technologies cannot calculate the short-circuit current of the vehicle's multi-voltage level DC power grid is solved, thus realizing the effectiveness and accuracy of short-circuit protection.

CN122150697APending Publication Date: 2026-06-05CHINA NORTH VEHICLE RES INST
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NORTH VEHICLE RES INST
Filing Date
2025-12-22
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies cannot effectively calculate the short-circuit current of multi-voltage DC power grids in vehicles, resulting in the inability to provide accurate data support for short-circuit protection of vehicle DC power grid systems. Furthermore, the calculation methods used for land power grids and ship power systems are not applicable to multi-voltage DC power grids in vehicles.

Method used

By employing the superposition principle, a multi-voltage grid topology is constructed by determining the voltage system and load type, the location of the short-circuit point and the direction of current flow are determined, and the short-circuit current of each branch, including generators, batteries, supercapacitors and permanent magnet synchronous motors, is calculated. Combining the different operating modes of the DC-DC converter, the total short-circuit current value is calculated using the superposition principle.

Benefits of technology

It enables the calculation of short-circuit current for DC power grids of multiple voltage levels in vehicles, provides an effective basis for short-circuit protection, and enhances the safety and reliability of vehicle DC power grid systems.

✦ Generated by Eureka AI based on patent content.

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Abstract

A kind of vehicle multi-voltage level DC grid short-circuit current calculation method, main steps include: determining voltage system and load type, determine the energy storage component on each voltage system, construct multi-voltage system grid topology;Determine the short-circuit point position, according to the short-circuit point position, determine the current flow direction of each short-circuit current branch current;Respectively calculate the short-circuit current provided by the flow component in each branch, including generator, battery, super capacitor, permanent magnet synchronous motor;Calculate the short-circuit current of DCDC under different working modes;Total short-circuit current value is calculated using superposition principle.The method can accurately realize vehicle multi-voltage level grid short-circuit current calculation, and is beneficial to the protection of vehicle DC grid system.
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