Method and system for suppressing direct-current bus impulse current output by direct-current charger

By dynamically monitoring and controlling the voltage difference between the DC output bus of the DC charger and the demand voltage on the vehicle side, the problems of severe bus voltage fluctuations and enhanced current surges are solved, achieving stable operation under short-term disturbances and suppression of surge currents.

CN121566397APending Publication Date: 2026-02-24LONGRUI SANYOU NEW ENERGY VEHICLE TECH CO LTD +1
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Patent Information

Application Number
CN202511694360.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-18
Publication Date
2026-02-24

AI Technical Summary

Technical Problem

Existing methods for suppressing inrush current on the DC bus output of DC chargers are insufficient to maintain dynamic consistency between the bus side and the vehicle side under complex operating conditions, resulting in severe bus voltage fluctuations, increased current surges, and decreased system dynamic stability.

Method used

By collecting the demand voltage of the charger's DC bus and the vehicle side, a voltage sequence is formed, the voltage change rate and voltage difference are calculated, and the voltage limit constraint control state is entered. Dynamic monitoring and constraint control are carried out using the limit function and current feedback control loop to realize the updating and adjustment of the voltage reference value and suppress the inrush current.

Benefits of technology

It effectively suppresses the peak inrush current caused by factors such as abnormal contactor operation and discontinuous communication timing, ensuring stable bus voltage, maintaining dynamic and stable system operation, and improving the system's anti-disturbance capability and response accuracy.

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Abstract

The invention belongs to the technical field of impact current suppression, and relates to a method and system for suppressing the impact current of a DC bus output by a DC charger, and the method comprises the following steps: collecting the output voltage of the DC bus and the required voltage of a vehicle side, and forming a voltage sequence; calculating the change rate and the pressure difference of the two; when the change rate exceeds a threshold value or the communication time sequence is discontinuous, entering voltage limiting constraint control; determining a limiting function according to the change rate and the voltage difference and updating a voltage reference value; adjusting the output voltage according to the updated reference value; and continuously executing voltage reference value updating and output adjustment until the output and the required voltage tend to be consistent, then exiting the voltage limiting constraint, and continuously performing dynamic adjustment according to the required voltage. According to the technical scheme, through dynamic monitoring and voltage difference constraint on the bus and the required voltage, voltage limiting adjustment and reference value smooth updating during sudden change are achieved, the impact current peak value is effectively restrained, and it is ensured that the voltage is stable, the current is limited, and the system operates stably.
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