Bidirectional flyback primary-side integrated battery energy storage system

Abstract

The invention discloses a bidirectional flyback primary-side integrated battery energy storage system. The bidirectional flyback primary-side integrated battery energy storage system comprises a battery unit, an active power converter, an auxiliary power converter and a control circuit, wherein the battery unit is formed by connecting n groups of battery modules in series, one end of the active power converter is connected in parallel with the battery unit, the other end of the active power converter is accessed to a three-phase power grid, the auxiliary power converter comprises a primary-side integrated high-frequency transformer, a primary-side converter and a secondary-side converter, one end of the primary-side converter is connected with the battery unit, the other end of the primary-side converter is connected with the primary-side integrated high-frequency transformer, one end of the secondary-side converter is connected with the primary-side integrated high-frequency transformer, the other end of the secondary-side converter is correspondingly connected with the battery modules, and the control circuit is connected with the active power converter and the auxiliary power converter. By the bidirectional flyback primary-side integrated battery energy storage system, independent current control of the battery modules can be ensured, the inconsistency of the battery modulesconnected in series is improved, so that maximum energy utilization rate is achieved, the service lifetime of the battery modules is prolonged, and more battery modules are easy to expand and connectin series.

Description

technical field [0001] The invention relates to the field of power electronic converters, in particular to a bidirectional flyback primary-side integrated battery energy storage system. Background technique [0002] With the increasingly severe global energy security and climate change issues, ecological and environmental protection issues are becoming more and more prominent, and a new round of energy technology revolution marked by new energy and smart grids is constantly gestating and developing. In order to solve the energy fluctuation problem caused by intermittent energy generation, energy storage technology is one of the best technologies to solve the problem. Among them, battery energy storage has been widely used due to its advantages of convenient and fast installation, short construction period, and convenient expansion and transformation (modularization). [0003] The existing modular battery energy storage system usually adopts a full-power independent control ...

AI Technical Summary

Problems solved by technology

Most of the traditional bidirectional single-tube flyback energy storage systems are aimed at the inconsistency and balance of the battery cells, the voltage level is low, and the power switch tube is turned off at the moment of large peak voltage.

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