Multi-port energy conversion device for charging electric vehicles, and control method thereof

Abstract

The invention provides a multi-port energy conversion device for charging electric vehicles, and a control method thereof, and relates to the technical field of electric energy conversion of power electronics. The system comprises a three-phase voltage type PWM rectification unit, a dual-active-bridge DC/DC conversion unit, an electric vehicle mutual charging interface, a photovoltaic input unit, a Boost conversion unit, a storage battery unit, a single-phase full-bridge inversion unit, a Buck conversion unit, a high-voltage DC port 1 and a high-voltage DC port 2. Influences of external factors are considered, error correction parameters are introduced for error compensation, energy in the electric vehicles is efficiently and reasonably distributed and utilized, meanwhile, the mutual charging technology between the electric vehicles is supported, a multi-target optimization control method is adopted, optimal control can be adopted for different energy input, plug and play of different input and output devices can be met, energy consumption requirements are provided for devices of different voltage grades due to the multi-port characteristic, and a technical basis is provided for mutual charging between electric automobiles.

Description

technical field [0001] The invention relates to the technical field of electric energy conversion of power electronics, in particular to a multi-port energy conversion device for electric vehicle charging and a control method thereof. Background technique [0002] With the rapid reduction of non-renewable energy and the increasingly severe living environment, the sustainable development of society no longer relies solely on a single form of energy. The development of new energy technologies has given people a variety of options for energy utilization. The penetration rate of electric vehicles is increasing year by year, and how to efficiently charge electric vehicles has become a hot issue. The cycle charging and discharging of the power battery of an electric vehicle needs to be realized through electric energy conversion. During the charging process of the battery, the electric energy should be utilized to the greatest extent as far as possible to avoid large-scale waste a...

AI Technical Summary

Problems solved by technology

[0003] The voltage level that the traditional electric vehicle charging technology can provide is relatively single, the form of energy flow is limited and the efficiency is low, the input and output ports are relatively fixed, the coordinated control of energy cannot be realized, and there are certain limitations in the access and utilization of new energy sex

Secondly, electric vehicles generally adopt two modes of AC slow charging and DC high-power fast charging, and the above methods mostly rely on charging piles, which greatly limits the possibility of long-distance driving of electric vehicles, making the development of electric vehicles relatively slow

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