Direct-current charging module control strategy of electric vehicle charging system

Abstract

The invention discloses a direct-current charging module control strategy of an electric vehicle charging system. Eight charging modules from 1 to 8 are arranged, charging guns comprise the gun A andthe gun B, the eight charging modules are electrically connected with a bus A through eight branching lines and electrically connected with the gun A through the bus A, the eight branching lines are provided with power switches from SA1 to SA8 respectively, and a power switch SA is installed on the bus A; the eight charging modules are electrically connected with a bus B through eight branching lines and electrically connected with the gun B through the bus B, the eight branching lines are provided with power switches from SB1 to SB2, and the bus B is provided with a power switch SB. The strategy is based on an existing direct-current charging pile, a set of distribution strategies capable of quickly adjusting the charging power according to the dynamic change of charging requirements is provided, the in-turn charging and simultaneous charging functions are optimized and improved on the basis that conventional in-turn charging and simultaneous charging are achieved, the charging efficiency can be greatly improved, and charging time is saved.

Description

technical field [0001] The invention relates to a control strategy for a DC charging module, in particular to a control strategy for a DC charging module of an electric vehicle charging system, and belongs to the technical field of new energy. Background technique [0002] At present, the modularization of DC charging piles has become the mainstream. The core business of most charging pile manufacturers focuses more on system integration. All components are uniformly supervised by one or more controllers to realize the man-machine integration of charging piles. Interaction, charging control, remote communication and other functions; for the control of the charging module inside the DC charging pile, most of them focus on the simple start-stop control. When formulating the power distribution strategy, there is no in-depth research on the input and exit mechanism of the charging module. , the control logic is relatively simple, especially when there are multiple outputs, there...

AI Technical Summary

Problems solved by technology

[0006] The above two modes have certain defects. For mode 1, the power distribution adopts a unified principle of equal sharing, and the decision-making is not based on the charging needs of specific vehicles. The control logic is too simple, and the utilization rate of charging piles is not high. The conversion efficiency cannot be optimal; for the second mode, one vehicle is charging while the other vehicle is in a waiting state. When the charging demand of the charging vehicle does not reach the output capacity of the charger, the surplus charging power is not effectively utilized. In disguise, the waiting time for the second car becomes longer; these defects will directly affect the utilization rate of charging piles, the energy conversion efficiency of charging piles, and then affect the equipment investment, scheduling and service capabilities of charging station operators

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