Energy storage converter and balanced control method

Abstract

The embodiment of the invention provides an energy storage converter and a balanced control method thereof. The energy storage converter comprises energy storage units, inductors, an A-phase input and output end, a B-phase input and output end and a C-phase input and output end; and an inductor and n energy storage units are respectively connected in series between the A-phase input and output end, the B-phase input and output end and the C-phase input and output end, wherein n is a positive integer; and each energy storage unit includes a battery pack, a capacitor and a single-phase full-bridge inversion circuit, wherein the battery pack comprises a plurality of parallel-connected batteries, and the battery pack, the capacitor and the full-bridge inversion circuit are in parallel connection. With the energy storage converter and the balanced control method thereof of the invention adopted, series connection of a plurality of batteries can be avoided, when one battery malfunctions, the whole energy storage converter is not needed to be shut down, and a single battery balancing function can be realized, and an additional BMS is not needed to be adopted, and the available capacity of a whole energy storage system can be improved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an energy storage converter and a balanced control method thereof. Background technique [0002] Wind power, photovoltaic and other renewable energy power generation are the most promising power generation methods for large-scale development and application. The technology is becoming more and more mature and is gradually being widely used. Renewable energy has the characteristics of intermittency, volatility and randomness, which lead to its large-scale grid connection will seriously affect the stability of the grid, power quality and economy. As one of the effective measures to address the above problems, energy storage technology can smooth active power fluctuations and adjust reactive power. It can also be applied to power grid peak shaving, frequency modulation, black start and other fields. With the rapid development of battery technology, battery energy storage system...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides an energy storage converter to solve the problem of overcharging or overdischarging a single battery caused by directly connecting batteries in groups and strings in the prior art. Once a battery has a problem , the entire energy storage converter must be shut down, which reduces the reliability of the entire system and the overall usable capacity of the battery pack, and does not have the balancing function of the single battery, requiring an additional BMS, but the balancing current of the BMS is small, The equalization effect is poor, more wiring is added, the system reliability is low, and the actual application effect is poor

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