A soc balance control method for distributed grid-connected electric vehicles

Abstract

The invention discloses a self-adaptive SoC balance control method for distributed grid-connected electric vehicles. Obtain the capacity of the battery, first allocate the initial power according to the capacity ratio, introduce self-power adjustment on this basis, carry out adaptive power allocation, and introduce the finally obtained reference power into PQ control, carry out real-time update and adjustment of the system, and The relationship between the SoC of each system and the average SoC is further judged, until the SoC reaches a balance. The invention can adjust in real time according to the change of grid connection requirements, and can solve the problem of SoC balance due to different capacities and different initial SoCs, so that each electric vehicle energy storage system can reach the balance of SoCs in a limited time, and avoid the generation of circulating current, and achieve The purpose of optimal control of electric vehicles in the process of grid connection is to cut peaks and fill valleys, so that the power grid can run more reliably and stably.

Description

technical field [0001] The invention relates to the technical field of grid-connected microgrid distributed energy storage systems, in particular to a SoC balance control method for distributed grid-connected electric vehicles. Background technique [0002] With the continuous popularization of electric vehicles and the development of V2G technology, more and more attention has been paid to the role of electric vehicles as a distributed energy storage device to participate in the peak shaving and valley filling of the power grid. Electric vehicles have flexibility and dispatchability that other load types do not have. Flexible electric vehicles can be in a discharge state during the grid connection process, and the charging and discharging power can be flexibly adjusted within the adjustable range. However, during the grid connection process of the initial SoC and electric vehicles with different capacities, the unbalance of the SoC may lead to instability of the grid system...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a SoC balance control method for distributed grid-connected electric vehicles, which solves the problem of SoC balance of distributed grid-connected electric vehicle energy storage systems with different capacities and different initial SoCs

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