Energy-storage voltage-balanced power electronic electric energy converting system and control method thereof

Abstract

The invention provides an energy-storage voltage-balanced power electronic electric energy converting system and a control method thereof. The energy-storage voltage-balanced power electronic electric energy converting system is composed of an energy storage module, a voltage-balanced converter, a power-grid-side inverter, a power grid load, an energy-storage-side inverter and an independent load. Through control over the high-frequency soft-switching voltage-balanced converter, balanced control over an energy storage unit or module is realized, the service life of energy storage equipment is prolonged, the use cost is reduced, and meanwhile, multiple routes of isolation direct voltage are provided for the power-grid-side inverter. The energy storage unit or module is charged and discharged through the electric energy converting system, electric isolation of energy storage and a power grid is realized, interaction is formed with the power grid, and the purposes of peak load shifting, harmonic suppression and reactive compensation are realized. The energy-storage voltage-balanced power electronic electric energy converting system is realized through modularized design and has the advantages that electric isolation of the power grid and the energy storage side is realized, control is simple, the size is small, the efficiency is high and the cost is low.

Description

technical field [0001] The invention relates to an energy storage voltage balance power electronic power conversion system and a control method thereof, in particular to a voltage balance system in which energy storage units are connected in series in the energy storage system and a charge-discharge conversion system thereof, and is especially suitable for electric vehicles, storage Energy system, uninterruptible power supply UPS, communication power supply and consumer electronic products in series energy storage module voltage balance and charging and discharging transformation connected to the grid, and can also be extended to DC conversion system realized by series connection of energy storage units. Background technique [0002] With the wide application of clean and environmentally friendly secondary energy, the storage of electric energy is becoming more and more important. Electric energy storage can not only provide backup uninterrupted power for electrical equipment...

AI Technical Summary

Problems solved by technology

However, due to the differences in materials, production processes, use environment and temperature of energy storage monomers, and the aging of energy storage monomers during use, the characteristic parameters such as output voltage, internal impedance and capacity of energy storage monomers Inconsistency occurs, which directly affects the service capacity, life and safety performance of the energy storage modules after being connected in series, and also limits the output voltage level of the energy storage modules

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