Electric vehicle bidirectional charging and discharging system and control method thereof

Abstract

The invention provides an electric vehicle bidirectional charging and discharging system and a control method thereof, the electric vehicle bidirectional charging and discharging system is mainly composed of a DC/DC converter and an ANPC converter, and the electric vehicle bidirectional charging and discharging system can automatically judge and operate in a single-stage mode or a two-stage mode.In a two-stage operation mode, the control is divided into two parts: the ANPC converter is controlled by a voltage outer loop current inner loop PI regulator to stabilize the bus voltage; the DC/DC converter is mainly used for realizing constant-voltage, constant-power and constant-current charging and discharging control on the battery of the electric automobile; and in the single-stage operation mode, the DC/DC converter stops operating, the ANPC converter independently completes constant-voltage, constant-power and constant-current charging and discharging control over the battery of the electric automobile, the control mode is flexible, and the operation efficiency of the bidirectional charging and discharging system of the electric automobile is improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle chargers, and in particular relates to an electric vehicle bidirectional charging and discharging system and a control method thereof. Background technique [0002] In recent years, the aggravation of environmental pollution, energy shortage, and greenhouse effect have become urgent problems to be solved in today's society. With the increasing number of cars in the world, these problems have been exacerbated; in order to cope with energy crisis and environmental pollution, transportation energy transformation Therefore, electric new energy vehicles have been paid more and more attention by countries and automobile manufacturers. The development of new energy electric vehicles is also an important strategy in my country. New energy electric vehicles are widely used in urban public transportation, logistics vehicles, and passenger vehicles. Charging facilities are the key to the developmen...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a two-way charging and discharging system for electric vehicles and its control method, which are used to solve the problems of inflexible charging methods and low charging and discharging efficiency of electric vehicles in the prior art

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