Energy storage system

Abstract

The invention provides an energy storage system, and the energy storage system comprises at least one energy storage unit cluster and a centralized monitoring system of the energy storage unit cluster, wherein the energy storage unit cluster is formed by connecting at least two energy storage modules in series; one energy storage module comprises an energy storage element group and a switch bridge arm, the switch bridge arm is composed of a master control switch and a bypass switch, one end of the master control switch is connected with the energy storage element group, the other end of the master control switch serves as a first input / output end of the energy storage module, one end of the bypass switch is connected with the first input / output end, and the other end of the bypass switch is connected with the second input / output end of the energy storage module; the energy storage unit cluster is coupled to the direct current bus through the DC / DC converter; and the centralized monitoring system is connected with the energy storage unit cluster through a control bus and is used for controlling the on or off of the main control switch and the bypass switch in any energy storage module in the energy storage unit cluster. According to the invention, the management flexibility of the energy storage system can be improved, the stability of the energy storage system is improved, and the applicability is higher.

Description

technical field [0001] The present application relates to the technical field of battery energy storage, and in particular to an energy storage system. Background technique [0002] In order to overcome the severe intermittency problems of large-scale photovoltaic power generation and wind power generation, and with the rapid decline in battery costs, battery energy storage, due to its application flexibility, controllability and energy density, has become an The power consumption side has been developed rapidly. Since the voltage of a single battery module is usually small, even connecting multiple battery modules in series cannot meet the needs of large-scale energy storage. Therefore, in order to balance cost and performance, such as figure 1 , the common practice in the industry is to connect multiple battery modules (battery module, BM) (such as battery module 11 to battery module 1n, battery module 21 to battery module 2n) in series to obtain multiple battery clusters...

AI Technical Summary

Problems solved by technology

However, the existing technology cannot solve the difference between battery clusters and battery clusters. At the same time, due to the introduction of each DC / DC converter, additional wiring is required to achieve energy transfer between different battery modules, and the wiring complexity is high. The high probability of error makes the delivery of the energy storage system difficult, the delivery quality cannot be guaranteed, and the applicability is poor

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