Direct current control device applied to multilevel energy storage system

Abstract

The invention discloses a direct current control device applied to a multilevel energy storage system. The direct current control device comprises a data acquisition module, a mode and strategy control module, a step-up control module, a step-down control module, a step-up driving module and a step-down driving module, wherein the input end of the data acquisition module is connected with a buck-boost direct current converter, and the output end of the data acquisition module is respectively connected with the mode and strategy control module, the step-up control module and the step-down control module; the mode and strategy control module is respectively connected with the step-up control module and the step-down control module; the step-up control module is connected with the step-up driving module which is connected with the buck-boost direct current converter, and the step-down control module is connected with the step-down driving module which is connected with the buck-boost direct current converter. The direct current control device disclosed by the invention is capable of controlling a main circuit to complete the bidirectional energy flow, and the main circuit can be switched freely between a step-up mode and a step-down mode, so that the stored energy in the battery is safely and reliably fed back to a power grid and the redundant energy in the power grid is stored into the battery.

Description

technical field [0001] The invention relates to a DC control device applied to a multi-level energy storage system, in particular to a control device for a buck-boost DC converter used in a multi-level energy storage system with bidirectional energy flow. Background technique [0002] Energy storage technology has been regarded as an important part of the six links of "production-generation-transmission-distribution-use-storage" in the process of power grid operation. After the energy storage link is introduced into the system, it can effectively manage the demand side, eliminate the difference between day and night peaks and valleys, and smooth the load. A means of system operation stability, frequency adjustment, and load fluctuation compensation. [0003] At present, energy storage systems can be divided into single-level and multi-level according to their topology. The single-stage energy storage converter consists of only one DC / AC link. Its advantages are simple stru...

AI Technical Summary

Problems solved by technology

The single-stage energy storage converter consists of only one DC / AC link. Its advantages are simple structure, relatively simple control, and high conversion efficiency. However, there are some disadvantages in the single-stage structure: the capacity configuration of the energy storage system is fixed, and the capacity cannot be upgraded. ;The voltage working range of the battery is small, which limits the application of the battery; in addition, the battery pack's current sharing characteristics are not good, which affects the service life of the battery

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