Electric energy feedback battery charge and discharge and capacity distribution equipment

Abstract

The invention discloses an electric energy feedback type battery charging and discharging and capacity dividing device, comprising: a Buck-Boost bidirectional converter, which is used for boosting and buckling a DC voltage to provide constant current and constant voltage for battery charging and discharging; Isolated switching power supply for boosting and bucking DC voltage; bidirectional DC / AC converter for converting voltage between DC and AC; control circuit for monitoring the Buck‑Boost Bidirectional converter, bidirectional isolated switching power supply, bidirectional DC / AC converter. By adopting the invention, the constant current charging of the battery can be realized, and the discharged electric energy of the battery can be fed back to the power grid to realize energy regeneration. The frequency isolation transformer realizes electrical isolation. When charging, high-frequency synchronous rectification is used to improve efficiency, improve grid-side power factor, and reduce harmonic content and other factors that endanger energy quality.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an electric energy feedback type battery charge and discharge and capacity distribution device. Background technique [0002] With the rapid development of the national economy and the continuous advancement of science and technology, the application of power supply systems based on batteries or batteries as backup power is becoming more and more common. Such as electric locomotives, DC power systems of power systems, DC uninterruptible power systems and AC uninterruptible systems (UPS) in communications, railways, subways, airports, fire protection and other fields require a large number of batteries. [0003] Battery formation, that is, repeated charging and discharging of batteries, is an important link in the battery production process, and the electric energy feedback type battery charging and discharging and capacity separation equipment is the main equipment for battery fo...

AI Technical Summary

Problems solved by technology

[0004] Due to technical and cost factors, the current charging and discharging methods of battery formation equipment are as follows: the charging process uses a traditional linear constant current source, the charging topology is relatively simple, and the use of uncontrollable rectification will bring various factors that reduce power quality to the grid, resulting in The low power factor and high harmonic content on the grid side will generate a large number of grid pollution sources and pollute the grid; the discharge process uses resistors or power semiconductor devices to generate heat and consume electricity, resulting in a large amount of heat, resulting in a waste of energy resources, and requiring the installation of a large number of high-power air conditioners. Cool down, consume a lot of power, the efficiency of the whole machine is low, and there is no power feedback device

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